Download Qume QVT-102 Specifications
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u A Subsidiary of ITT QVT-102 Maintenance Guide July 1983 2350 Qume Drive • San Jose, California 95131 • TWX 910-338-0232 • (408) 942-dOOO PREFACE The QVT-I02 Maintenance Guide has been designed to enable maintenance personnel to quickly isolate a fault and take corrective action in a minimum amount of time. It is assumed that all who may use this guide have rudimentary knowledge of the QVT-I02 video terminal. The QVT-I02 Maintenance Guide is divided into the following sections: - Troubleshooting - for isolating a fault to a subassembly. - Subassembly Removal and Replacement - for replacing the failed subassemb 1y. - Alignment - for performing any necessary video alignment after replacing a subassembly. . - Parts - for identification of parts and spares information. - Circuits and Diagrams - reference. ASSOCIATED PUBLICATIONS Refer to the QVT-I02 Operator Manual, Reorder Number 35003, for general user information. For abbreviated user information, refer to the QVT-I02 Quick Reference Card, Reorder Number 35008. i TABLE OF CONTENTS Page SECTION 1. TROUBLESHOOTING ••••••••••••••••••••••••••••••••••••••••••• I ntroduct ion ••••••••••••••••••••••••••••.••••••••••••••• Troubleshooting Technique •••••••••••••••••••••••••••••• Troubleshooting Flowcharts ••••••••••••••••••••••••••••• Tools and Equipment Required •••••••••••••••••••••••• Fault Isolation Flowchart # 1••••••••••••••••••••••• Fault Isolation Flowchart # 2••••••••••••••••••••••• Fault Isolation Flowchart # 3••••••••••••••••••••••• Fault Isolation Flowchart # 4••••••••••••••••••••••• Fault Isolation Flowchart # 5••••••••••••••••••••••• Error Codes Summary •••••••••••••••••••••••••••••••••••• SECTION 2. SUBASSEMBLY REMOVAL AND REPLACEMENT ••••••••••••••••••••••• Introduction ••••••••••••••••••••••••••••••••••••••••••• Safety Summa ry ••••••••••••••••••••••••••••••••••••••••• Lower Monitor Area •••••••••••••••••••••••••••••••••• Upper Monitor Area •••••••••••••••••••••••••••••••••• Cover Sets ••••••• ~ •••••••••••• ~ •••••••••••••••••••••••• Keyboard - Top Cover ••--• ••••••••••••••••••••••••••••• Keyboard - Bottom Cover (Keyboard PCB and Coiled •••• Keyboard Cab 1e) Key Caps •••••••••••••••••••••••••••••••••••••••••••• Monitor - Back Cover •••••••••••••••••••••••••••••••• Monitor - Bottom Cover •••••••••••••••••••••••••••••• Lower Monitor Area Subassemblies ••••••••••••••••••••••• Logic PCB ••••••••••••••••••••••••••••••••••••••••••• Switching Power Supply •••••••••••••••••••••••••••••• Power On/Off Switch ••••••••••••••••••••••••••••••••• Fuse ·Holder ••••••••••••••••••••••••••••••••••••••••• Batte ry ••••••••••••••••••••••••••••••••••••••••••••• Brightness Potentiometer •••••••••••••••••••••••••••• Main Wiring Harness ••••••••••••••••••••••••••••••••• Upper Monitor Area Subassemblies ••••••••••••••••••••••• Video PCB •••••••••••••••••••••••••••••••••••••• ~ •••• CRT ••••••••••••••••••••••••••••••••••••••••••••••••• SECTION 3. ALIGNMENT ••••••••••••••••••••••••••••••••••••••••••••••••• Introduction ••••••••••••••••••••••••••••••••••••••••••• Tools and Equipment Required ••••••••••••••••••••••••••• Alignment Conditions ••••••••••••••••••••••••••••••••••• Video Alignment Procedures ••••••••••••••••••••••••••••• Horizontal Display Width (Line Width) ••••••••••••••• Vertical Display Height ••••••••••••••••••••••••••••• Display Centering (Raster Tilt) ••••••••••••••••••••• Horizontal Linearity (Uniform Character Width) •••••• Vertical Linearity (Uniform Character Height) ••••••• Brightness •••••••••••••••••••••••••••••••••••••••••• FOCU S ••••••••••••••••••••••••••••••••••••••••••••••• 1-1 1-1 1-1 1-1 1-1 1-2 1-4 1-6 1-7 1-8 1-9 2-1 2-1 2-1 2-1 2-1 2-2 2-2 2-2 2-5 2-6 2-8 2-10 2-12 2-13 2-14 2-14 2':'16 2-18 2-19 2-20 2-22 2-24 3-1 3-1 3-1 3-4 3-6 3-7 3-7 3-7 3-8 3-8 3-9 3-9 iii TABLE OF CONTENTS (Cant) Page SECTION 4. PARTS. • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 4-1 Recommended Spare Parts................................ 4-7 SECTION 5. CIRCUITS AND DIAGRAMS. •.•••••••••••••••••••••••••• •••• ••••• 5-1 LIST OF ILLUSTRATIONS Fi gure 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-11 3-1a 3-1b 3-2 3-3 4-1 5-1 5-2 5-3 5-4 5-5 Page KeybQard Top Cover Removed •••••••••••••••••••••••••••••••• Keyboard PCB Removal and Replacement •••••••••••••••••••••• Key Cap Removal and Replacement ••••••••••••••••••••••••••• Monitor Back Cover Removal and Replacement •••••••••••••••• Monitor Bottom Cover Removal and Replacement •••••••••••••• Lower Monitor Area •••••••••••••••••••••••••••••••••••••••• Power ON/OFF Switch and Fuse Holder Removal and ••••••••••• Rep 1acement Battery Removal and Replacement ••••••••••••••••••••••••••• Brightness Potentiometer Removal and Replacement •••••••••• Upper Monitor Area •••••••••••••••••••••••••••••••••••••••• Discharging the CRT Anode ••••••••••••••••••••••••••••••••• QVT Alignment Tools Set ••••••••••••••••••••••••••••••••••• QVT Alignment Tools Set ••••••••••••••••••••••••••••••••••• The "H" Test Pattern •••••••••••••••••••••••••••••••••••••• Video Alignments •••••••••••••••••••••••••••••••••••••••••• QVT-I02 Exploded View Diagram••••••••••••••••••••••••••••• QVT-I02 Functional Block Diagram•••••••••••••••••••••••••• QVT-I02 Interconnect Wiring Diagram••••••••••••••••••••••• QVT-I02 Keyboard Schematic •••••••••••••••••••••••••••••••• QVT-I02 Video PCB Schematic ••••••••••••••••••••••••••••••• QVT-I02 Logic PCB Schematic ••••••••••••••••••••••••••••••• 2-3 2-4 2-5 2-7 2-9 2-11 2-15 2-17 2-19 2-21 2-23 3-2 3-3 3-5 3-6 4-3 5-3 5-5 5-7 5-9 5-11 LIST OF TABLES Page Table 1-1 4-1 iv Error Codes Summary ••••••••••••••••••••••••••••••••••••••• Recommended Spare Parts ••••••••••••••••••••••••••••••••••• 1-9 4-7 SECTION 1 TROUBLESHOOTING INTRODUCTION This section provides a troubleshooting method for isolating most QVT-I02 failures to an easily replaced subassembly, by systematically advancing through a series of troubleshooting flowcharts. r TROUBLESHOOTING TECHNIQUE Effective troubleshooting technique should always begin with a thorough visual inspection. Look for obvious things that may adversely effect the performance of the terminal, such as: - Is the AC power source supplying adequate power, Is the brightness potentiometer properly adjusted, Are all connectors making good contact, Is there a compatibility problem between the terminal and the host? TROUBLESHOOTING FLOWCHARTS When using the following troubleshooting flowcharts, always begin with Fault Isolation Flowchart # 1. Although each flowchart is more or less tailored to troubleshoot a general area, it should be noted that they have been purposefully arranged to quickly isolate a fault to a replaceable subassembly. It is not recommended that the flowcharts be used out of sequence. Refer to the Ci rcui ts and Di agrams Secti on for more specfi c i nformati on as necessary. Tools and Equipment Required - DB25 Loopback Connector, Phillips Screwdriver, Multimeter, High Voltage Probe, Interconnect Wiring Diagram and Schematics (refer to Section 5). 1-1 TROUBLESHOOTING Fault Isolation Chart' 1 Powe rOn Un it. I Proceed to Does Unit Display an ---YES-----------> Faul t Codes Summary (Page 2-9). Error Code. -NO Perform Self-Test (ESC V). I Does Unit Perform ---NO---------------> Proceed to Flowchart # 2. Self-Test. -YES Exit Self-Test, Enter Local Mode. Press Each Key on Keyboard. I Are Characters Displayed as Keys ---NO-----> Proceed to Flowchart # 3. Are Pressed. -YES Exit Local Mode, Enter On Line Mode & Full Duplex Mode. Install Loopback Connector to EIA Port. Press Each Key on Keyboard. I I Are Characters Displayed as Keys ---NO-----> Logic PCB Defective. Are Pressed to Section 2). -YES Connect Printer to AUX Port. Exit On Line Mode &Enter Local Mode. Print. I 1-2 Replace Logic PCB (refer TROUBLESHOOTING Fault Isolation Flowchart' 1 (Cont) I s Screen Data Printed. ---NO----------> Logic PCB Defective. (refer to Section 2) Replace Logic PCB -YES Unit Checks OK. 1-3 TROUBLESHOOTING Fault Isolation Flowchart' 2 From Flowchart # 1. I I Are AC Line and Power Supply---NO--------> Replace Bad Fuse(s). Fuses Good. Continue. -YES Does Either Fuse Fail --NO---> Return. Again at Power On. Begin Flowchart # 1. -YES Verify Operation of ON/OFF Switch. Is ---NO-----> Return. Switch Defective. Begin Flowchart # 1. -YES Replace Switch (refer to Section 2). Continue. I Does Either Fuse Fail --NO---> Return. Again at Power On. Begin Flowchart # 1. -YES Replace Fuse(s). Disconnect P12, P13 and P14 to Isolate Power Supply. On Unit and Verify Power Supply Voltages: (All voltages are de). P12: Pin Pin Pin Pin 1 2 3 4 +5 V GND H +12 V NC P13: Pin Pin Pin Pin 1 2 3 4 +5 V GND V +12 V NC P14: Pin Pin Pin Pin 1 2 3 4 Power +5 V GND +12 V -12 V I Are All Voltages ---NO-------> Power Supply is Defective. Present. Replace Power Supply (refer to Section 2). -YES Power Supply Checks OK. Power Off Unit and Reconnect Power Supply Connectors P12, P13 and P14. Disconnect P6 and the Keyboard Telephone Jack from the Logic PCB. Power On the Unit. I 1-4 TROUBLESHOOTING Fault Isolation Flowchart , 2 (Cant) Does Either Fuse Fail --NO---> Logic PCB Checks OK. Keyboard or Video PCB Again at Power On. is Defective. Continue. -YES Replace Fuse(s). Power On Unit. Connect Keyboard Telephone Jack to the Logic PCB. I Does Either Fuse Fail --NO---> Keyboard Checks OK. Video PCB is Shorted. Again at Power On. Replace Video PCB (refer to Section 2). Return to Flowchart # 1. -YES Keyboard or Coiled Keyboard Cable is Defective. Return to Flowchart # 1. 1-5 TROUBLESHOOTING Fault Isolation Flowchart , 3 From Flowchart # 1. I Is +12 Vdc and GND Present at PIlon Keyboard PCB. ----NO---------> Coiled Keyboard Cable is Defective. (Pin 1, GND/Pin 2, +12 Vdc) Replace Coiled Keyboard Cable (refer to Section 2). -YES Is 10 Vdc + 1 V Present at ---NO----> Logic PCB is Defective. Replace Logic P10, Pin I-on Logic PCB. PCB (refer to Section 2). -YES Depress Each Key on Keyboard For a Minimum of 2 Seconds Each and Observe an AC RMS Voltage at PIO, Pin 1 on Logic PCB. I Does This Voltage Increase Approx. 200 mVac RMS While ---NO------> Keyboard is Defective. Replace Each Key is Pressed Keyboard Assembly (Refer to I Section 2). -YES Is The Correct Character ------NO--------------------> Proceed to Flowchart # 4. Displayed. -YES Unit Checks OK. 1-6 Proceed to System Test. TROUBLESHOOTING Fault Isolation Flowchart , 4 From Flowchart # 3. I Check the Following Voltages on the Logic PCB: P5-1: Pin 1 Pin 2 +5 Vdc +5 Vdc P5-2: Pin Pin Pin Pin 1 2 3 4 -12 Vdc GND +5 Vdc +12 Vdc Are All Voltages Present. --NO---> Defective Main Wiring Harness. Replace Main Wiring Harness (refer to Section 2). -YES Verify Proper Operation of the Brightness Potentiometer. Rotate Pot Full CCW, Then Full CW. Observe a 300 mVdc Voltage Change Between Pins 1 and 2 of P7. I Does Voltage Change ---NO----> Brightness Potentiometer is Defective. Replace Approx. 300mVdc. Brightness Potentiometer (refer to Section 2). -YES Blank Screen (Shift-Home/Clear). At P6, Pin 5 Note an AC RMS Voltage. Display Self-Test (ESC V). At P6, Pin 5 Note an AC RMS Voltage. I Did Voltag~ Increase Approx. 400 mVac RMS When ---NO---> Logic PCB is Defective. Replace Logic Self-Test Was Displayed. PCB (refer to Section 2). -YES Proceed to Flowchart # 5. 1-7 TROUBLESHOOTING Fault Isolation Flowchart # 5 From Flowchart # I 4~ Display IIH Test Pattern (Ctrl/Shift/Setup-Zero). II I Check Voltages on Video PCB, PI: Pin 1 2 3 4 +12 Vdc GND +12 Vdc GND Are Voltages Present. ---NO---> Main Wiring Harness Defective. Replace Main Main Wiring Harness (refer to Section 2). I I-YES With Brightness Potentiometer Full CW, Check P2, Pin 5 for Approx. 400 mVac RMS. I Is Approx. 400 mVac RMS ---NO------> Main Wiring Harness Defective. Replace Present. Main Wiring Harness (refer to Section 2). -YES With a HIGH VOLTAGE Probe, Check the CRT Anode Cap for Approx. 13 kVdc. I Is Approx. 13 kVdc Present --NO----> Video PCB Defective. Replace Video PCB at CRT Anode Cap. (refer to Section 2). -YES Check the Following Voltages on the Video PCB (Tolerance P3, P3, P4, P4, K1 Pin Pin Pin Pin -28 2 1 2· 1 Vdc 0.3 Vac RMS 1.3 Vac RMS 10 Vac RMS 25 Vac RMS K2 K3 K4 K5 K6 -YES 1-8 25%): 550 Vdc 45 Vdc 175 Vdc 12 Vdc 0.1 Vac RMS Are All Voltages ---NO-------> Video PCB Defective. Present. to Section 2). CRT Defective. ~ Replace CRT (refer to Section 2). Replace Video PCB (refer TROUBLESHOOTING ERROR CODES SUMMARY As part of the termi na l' s power on sequence, it performs an i nterna 1 selftest, and signals that it has successfully completed this test by sounding the audi b1e alarm. However, if a non-fatal error is detected, an error code wi 11 be displayed on the screen. For example, if the letter "0" is displayed, this signifies that a fault has been isolated to the Logic PCB (i.e. IC U19). The following table lists all possible error codes. Table 1-1. ERROR CODE A B C o E F G H I J K L M N o . Note: Error Codes Summary CORRECTIVE AcTION Replace Replace Replace Replace Replace Replace Replace Replace Replace Replace Replace Replace Replace Replace Replace U8, or the Logic PCB. U6, U7, or the Logic PCB. U6, U7, U8, or the Logic PCB. U19, or the Logic PCB. U8 and U19, or the Logic PCB. U6, U7 and U19, or the Logic PCB. U6, U7, U8 and U19, or the Logic PCB. the Keyboard. U8, or the Logic PCB, and the Keyboard. U6 and U7, or the Logic PCB, and the Keyboard. U6, U7 and U8, or the Logic PCB, and the Keyboard. U19, or the Logic PCB and the Keyboard. U8 and U19, or the Logic PCB and the Keyboard. U6, U7 and U19, or the Logic PCB and the Keyboard. U6, U7, U8 and U19, or the Logic PCB and the Keyboard • U6, U7, U8 and U19 are located on the Logic PCB. 1-9 SECTION 2 SUBASSEMBLY REMOVAL AND REPLACEMENT INTRODUCTION Thi s sect ion descri bes how to remove and replace the major subassemb1i es of the QVT -102. Before begi nni n9, pl ace the Power On/Off swi tch in the OFF position and disconnect the power cord from the power source. Thoroughly read each procedure before attempting any subassembly removal and replacement. A medium size Phillips head screwdriver, a small adjustable wrench, and soldering equipment are the only tools required. SAFETY SUMMARY In addition to the normal safety precautions that should always be practiced during any maintenance procedure on electronic equipment, personnel should also be aware of the following safety hazards. Lower Moni tor Area The lower monitor area contains the logic PCB and the power supply. CAUTION Upper Monitor Area The upper monitor area contains the CRT and the video PCB. CAUTION 2-1 SUBASSEMBLY REMOVAL AND REPLACEMENT COVER SETS The paragraphs be low descri be the remova 1 and rep 1acement of the cover sets for the keyboard and monitor. Thi s procedure prefaces the removal and replacement of the other QVT-I02 subassemblies. Keyboard - Top Cover The top cover of the keyboard is secured from the underside of the keyboard assemb ly by six screws. REMOVAL 1. Disconnect the keyboard cable from the monitor. 2. Place the keyboard upside down on a level surface and remove the six screws.L i ft the bottom cover with keyboard PCB away from the top cover. REPLACEMENT To replace the top cover, simply reverse the above procedure. Keyboard - Bottom Cover (Keyboard PCB and Coiled Keyboard Cable) To remove and replace the bottom keyboard cover, it is also necessary to remove and replace the keyboard PCB and the keyboard cable. REMOVAL 1. Remove the top cover from the keyboard assembly. Top Cover Removal and Replacement procedure. 2. Remove cover. the ei ght screws that Refer to Figure 2-1. secu re Refer to the Keyboard the keyboard PCB to the bottom 3. Lift the keyboard PCB up and 1ay it over the back edge of the bottom cover. Refer to Fi gure 2-2. 4. Disconnect the coiled keyboard cable from the keyboard PCB and remove the cable from its retai ners on the i nsi de of the bottom cover. Be careful not to damage the cable by overstressing its tensile strength. Remove the keyboard cable, keyboard PCB, and bottom cover. 2-2 3 SCREWS " ., (Q c:: Cl> N I ...... A ~ r::r o ., Q) 0.. -i o (/) "'C c: n ):- < (/) (/) CXJ o ., rn C1> ~ CXJ r- ;0 -< I'D 3 o ;0 rn < Cl> 0.. ~ 0 NOTE: 8 SCREWS SECURE THE KEYBOARD PCB < ):- INSIDE THE KEYBOARD BOTTOM COVER r- ):- :z 0142 0 ;0 rn -0 r- ):- n N I W rn ~ rn :z -i N I ~ _... • • '"T1 ..... to .,r:: I'D N . I N ............ KEYBOARD CABLE RETAINERS r:::r o QI -, 0.. " - .... • R .~. [email protected]'l!,'jf*t%*&1ii} • • • • • • • • • • • • • • • • • • • •_ • • •_ • • • •_ _.~ .•.~J.~.• ~~***\,$,.j ".1 • • • • • • • • • •-.-,·• . • • • • • • • • • • • • • • • • •11.£1 •.·.·.I. OCI.~.I!!\[I•.;.!. • ••••••••••••••I.liIMII)II·lilr~iI••...•.~.\I.'1.UUI"JL,I!,1l~jt;ll;ff) 1II1I111I1I11bl:~.· 1·11.··· 7' ~ /KEYBOARD_BO~OMCOVE COILED KEYBOARD CABLE -0 ("') OJ :::0 ro 3 o < QI --' QI ::J 0.. :::0 ro '"0 QI n I'D 3 I'D ::J M' KEYBOARD CABLE CONNECTOR ( INSTALLED) .... .. , .. ..,.. ,-. .-.. • ...••••. ..••••••••••••••••••••••• .• .. - • ..- .............. -. -... ... • ..• -• -. • • • • - - • • • •• • - • • • • •• • • • • -. ft- • ~ • • • • • It • • \ • • • • KEYBOARD PCB 0141 SUBA$SEMBLY REMOVAL AND REPLACEMENT REPLACEMENT 1. Insert the coi led keyboard cable through its access hole in the bottom cover and secure it to its retainers. Be careful not to damage the cable by overstres~ing its tensile strength. Connect the keyboard cable connector to the keyboard PCB. Refer to Figure 2-1. 2. Install the keyboard PCB in the bottom cover and secure it in place with eight screws. Ref~r to Figure 2-2. 3. Replace the top cover on the keyboard assembly. Cover Removal and Replacement procedure. Refer to the Keyboard Top Key Caps REMOVAL A key cap can be easily removed by gripping it between index finger and thumb and pulling up. Refer to Figure 2-3. REPLACEMENT To replace a key cap, position it over its location and press downward with gentle pressure. Be sure to position the key cap so that its four alignment tabs engage the key cap plunger. Refer to Figure 2-3. KEY CAP ALIGNMENT TAB (4 TOTAL) 691·A.Q2 Figure 2-3. Key Cap Removal and Replacement 2-5 SUBASSEMBLY REMOVAL AND REPLACEMENT Monitor - Back Cover REMOVAL To remove the back cover for access to the upper monitor area (CRT and video PCB), proceed as follows. Refer to Figure 2-4. CAUTION 1. Orient the monitor to gain screwdriver access to the bottom edge of the monitor back cover. 2. Remove the two screws that secure the back cover to the monitor, and slide the back cover to the rear until it is free of its support tracks on the display swivel support. REPLACEMENT 1. Install the back cover on the monitor by sliding it into position on the display swivel ?upport. Refer to Figure 2-4. 2. Secure the back cover to the monitor with two screws. 2-6 SUBASSEMBLY REMOVAL AND REPLACEMENT ---'-_-.c- , I BACK COVER TWO HEX HEAD SCREWS SECURE MaN ITOR BACK COVER I ----£ 223·B..()2 Figure 2-4. Monitor Back Cover Removal and Replacement 2-7 SUBASSEMBLY REMOVAL AND REPLACEMENT Monitor - Bottom Cover REMOVAL To remove the bottom cover for access to the lower monitor area (logic PCB and power supply), proceed as follows. Refer to Figure 2-5. CAUTION 1. Remove the knob from the brightness potentiometer. 2. Lay the monitor on its side and loosen the four recessed screws at the corners. These screws are capti ve screws, so it is not necessary to remove them. 3. Remove the bottom cover from the monitor. To remove any of the subassemb 1i es mounted on the i nsi de of the bottom cover, refer to the appropriate removal procedure. REPLACEMENT 1. Install any subassemblies on the inside of the bottom cover that have been previously removed. Refer to the appropriate replacement procedure. 2. Position the bottom cover on the monitor and tighten the four recessed screws to secure it in place. Refer to Figure 2-5. 3. Install the knob on the stem of the brightness potentiometer. 2-8 SUBASSEMBLY REMOVAL AND REPLACEMENT KNOB CAPTIVE SCREWS ( 1 EACH CORNER) 222-8-01 Figure 2-5. Monitor Bottom Cover Removal and Replacement 2-9 SUBASSEMBLY REMOVAL AND REPLACEMENT LOWER MONITOR AREA SUBASSEMBLIES The Lower Monitor Area contains the following subassemblies. 2-6. - Logic PCB, - Power Supply, - Power On/Off Switch, - Fuse Holder, - Battery, - Brightness Potentiometer, - Main Wiring Harness. 2-10 Refer to Figure SUBASSEMBLY REMOVAL AND REPLACEMENT CHASSIS GND 1 POWER SUPPLY P6 P15 P12 ____ P13 P14 CHASSIS GND 2 P10 MAIN WIRING HARNESS P5-2 BRIGHTNESS POTENTIOMETER 0139 Figure 2-6. Lower Monitor Area 2-11 SUBASSEMBLY REMOVAL AND REPLACEMENT Logic PCB REMOVAL CAUTION 1. Gain access to the lower monitor area. Cover Removal and Replacement procedure. Refer to the Monitor - Bottom 2. Disconnect the following connectors from the logic PCB. 2-6. P5-1 P5-2 P6 P7 PI0 Refer to Figure +5 Vdc from the power supply, +12 Vdc from the power supply, Vi deo PCB, Brightness potentiometer, Keyboard input. 3. Remove the 8 screws that secu re the 1ogi c PCB (and the chass is ground strap on the keyboard input jack) to the bottom cover. from the bottom cover. Lift the logic PCB REPLACEMENT 1. Pos it i on the 1ogi c PCB over its mount i ng holes in the bottom cover and secure it in place with 8 screws. Be sure to also install the chassis ground strap from the keyboard input jack. Refer to Fi gure 2-6. 2. Reconnect all connectors listed in the Removal procedure above. 3. Reinstall the bottom cover on the monitor. Cover Removal 2-12 an~ Replacement procedure. Refer to the Monitor - Bottom SUBASSEMBLY REMOVAL AND REPLACEMENT Switching Power Supply REMOVAL CAUTION 1. Gain access to the lower monitor area. Cover Removal and Replacement 'procedure. Refer to the Monitor - Bottom 2. Disconnect the following connectors from the power supply. Figure 2-6. P12 P13 P14 PIS GND Refer to I I > +5 Vdc and +12 Vdc output connectors, Source voltage input, Power supply ground. (The ground lead on later model power supplies is soldered to the power supply, but easily removable from chassis ground 2.). 3. Remove the four screws that secure the power supply to the bottom cover. Lift the power supply from the bottom cover. REPLACEMENT 1. Position the power supply over its mounting holes in the bottom cover and secure it in place with four screws. Refer to Figure 2-6. 2. Reconnect all the connectors listed in the Removal procedure above. 3. Reinstall the bottom cover on the monitor. Cover Removal and Replacement procedure. Refer to the Monitor - Bottom 2-13 SUBASSEMBLY REMOVAL AND REPLACEMENT Power On/Off Switch REMOVAL CAUTION 1. Gain access to the lower monitor area. Cover Removal and Replacement procedure. Refer to the Monitor - Bottom 2. Remove the two screws that secure the filter PCB and the power switch with bracket in the bottom cover. Refer to Figure 2-7. 3. Remove the filter connecting leads. PCB; it is not necessary to de-solder its four 4. Note the arrangement of the four leads on the power switch. De-solder these leads and remove the power switch with its mounting bracket. 5. Remove the two screws that secure the power switch to its mounti ng bracket. Remove the power switch. REPLACEMENT 1. Secu re the power swi tch to its mount i ng bracket wi th the two screws removed in Step 5 above. Refer to Figure 2-7. 2. Re-solder the four leads to the power switch. 3. Position the power switch mounting bracket over its mounting holes in the bottom cover. Position the line filter PCB over the power switch mounting bracket so that all mounting holes are in line. Secure in place with the two screws removed in Step 2 above. 4. Reinstall the bottom cover on the monitor. Cover Removal and Replacement procedure. Fuse Holder REMOVAL CAUTION 2-14 Refer to the Monitor - Bottom SUBASSEMBLY REMOVAL AND REPLACEMENT 1. Gain access to the lower monitor area. Cover Removal and Replacement procedure. Refer to the Monitor - Bottom 2. Note the arrangement of the two leads on the fuse holder. leads from the fuse holder. Refer to Figure 2-7. De-solder these 3. With a small adjustable wrench, remove the nut and washer that secures the fuse holder to the inside of the bottom cover. Remove the fuse holder. REPLACEMENT 1. Install the fuse holder in the bottom cover and secure it in place with the washer and nut removed in Step 3 above. Refer to Figure 2-7. 2. Re-solder the two leads to the fuse holder. 3. Reinstall the bottom cover on the monitor. Cover Removal and Replacement procedure. POWER SWITCH MOUNTING BRACKET Refer to the Monitor - Bottom . 1/ ~ FilTER PCB ~.i /l~ :/ Q'jj! J Qp' ~u ~ ~I FUSE HOLOER RETAINER CAP ~1~ ~"---,;" POWER ON/OFF SWITCH TO FilTER PCB (BlK) TO FilTER PCB (WHT ) ~ ~ FUSE I " FUSE HOLDER NUT AND WASHER /, 1 /// FUSE HOLDER Figure 2-7. 209-6-02 Power ON/OFF Switch and Fuse Holder Removal and Replacement 2-15 SUBASSEMBLY REMOVAL AND REPLACEMENT Battery REMOVAL AND REPLACEMENT CAUTION . . . uL The battery is easily removed and replaced by sliding it in and out of its retainer clip on the Logic PCB (refer to Figure 2-8). As a reference, note the status 1i ne set-up confi gurati on of the termi na 1 before removi ng the battery. Once the battery is replaced, if after power ON the status 1i ne appears to be altered, execute a Shift-D and reconfigure the status line as you have noted. 2-16 SUBASSEMBLY REMOVAL AND REPLACEMENT BATTERY RETAINER CLIP BATTERY 695-A-Q1 Figure 2-8. Battery Removal and Replacement 2-17 SUBASSEMBLY REMOVAL AND REPLACEMENT Brightness Potentiometer REMOVAL CAUTION 1. Gain access to the lower monitor area. Cover Removal and Replacement procedure. Refer to the Monitor - Bottom 2. Disconnect the brightness potentiometer connector (P7) from the Logic PCB. Refer to Figure 2-6. 3. Remove the two screws that secure the brightness potnetiometer and mounting bracket to the bottom cover. Refer to Figure 2-9. 4. With a small adjustable wrench, remove the nut that secures the brightness potenti ometer to the mounti ng bracket. Remove the bri ghtness potent i ometer. REPLACEMENT 1. Secure the brightness potentiometer to its mounting bracket with the nut removed in Step 4 above. Refer to Figure 2-9. 2. Position the brightness potentiometer with mounting bracket over its mounting holes in the bottom cover. Be sure to orient the mounting bracket so that the high side of its sloped top surface is toward the rear. Secure in place with the two screws removed in Step 3 above. 3. Reconnect the bri ghtness potent i ometer connector (P7) to the Logi c PCB. Refer to Figure 2-6. 4. Reinstall the bottom cover on the monitor. Cover Removal and Replacement procedure. 2-18 Refer to the Monitor - Bottom SUBASSEMBLY REMOVAL AND REPLACEMENT P7 MOUNTING BRACKET BRIGHTNESS POTENTIOMETE R 694-A.Q2 Figure 2-9. Brightness Potentiometer Removal and Replacement Main Wiring Harness The main wiring harness includes all the point-to-point wiring between the major subassemblies of the QVT-I02. If removal and replacement of the main wiring harness is required, refer to the QVT-102 Interconnect Wiring Diagram found in the Circuits and Diagrams Section. 2-19 SUBASSEMBLY REMOVAL AND REPLACEMENT UPPER MONITOR AREA SUBASSEMBLIES The Upper Monitor Area contains the following subassemblies. 2-10. - Video PCB, - CRT. 2-20 Refer to Figure SUBASSEMBLY REMOVAL AND REPLACEMENT FLYBACK TRANSFORMER LEAD P3 ( NOT VISIBLE) CRT GROUND LEAD VIDEO PCB P1 0135 P4 Figure 2-10. Upper Monitor Area 2-21 SUBASSEMBLY REMOVAL AND REPLACEMENT Video PCB REMOVAL CAUTION 1. Gain access to the upper monitor area. Removal and Replacement procedure. Refer to the Monitor - Back Cover 2. Discharge the CRT high voltage circuit and remove the flyback transformer anode cap. Figure 2-11 illustrates the proper method of discharging the CRT anode by usi ng the shaft of an i nsu 1ated screwdri ver, to short the anode to the metalized surface of the CRT. 3. Disconnect the following connectors from the video PCB. 2-10. PI P2 P3 P4 GND Refer to Figure +12 Vdc, Horizontal and vertical sync, Horizontal yoke deflection, Vertical yoke deflection, CRT grounding spring. 4. Remove the five screws that secure the video PCB in place, and remove the CRT socket PCB from the neck of the CRT. Remove the video PCB from the monitor. REPLACEMENT 1. Place the video PCB over its mounting holes, and install the CRT socket PCB on the neck of the CRT. Secure the video PCB with five screws. 2. Install the flyback transformer lead on the CRT. 3. Reconnect all connectors listed in the Removal procedure above. 4. Perform any video alignments necessary. 5. Reinstall the back cover on the monitor. ·Cover Removal and Replacement procedure. 2-22 Refer to the Monitor - Back SUBASSEMBLY REMOVAL AND REPLACEMENT METALIZED INSULATED SCREWDRIVER SURFACE OF CRT FLYBACK TRANSFORMER LEAD ANODE CAP 0134 Figure 2-11. Discharging the CRT Anode 2-23 SUBASSEMBLY REMOVAL AND REPLACEMENT CRT REMOVAL CAUTION 1. Gain access to the upper monitor area. Removal and Replacement procedure. Refer to the Monitor - Back Cover 2. Discharge the CRT high voltage circuit and remove the flyback transformer anode cap. Figure 2-11 illustrates the proper method of discharging the CRT anode by us i ng the shaft of an i nsu 1ated screwdri ver, to short the anode to the metalized surface of the CRT. 3. Disconnect connectors P3 and P4 (horizontal and vertical yoke deflection leads) from the video PCB. Refer to Figure 2-10. 4. Di sconnect the CRT ground 1ead from the CRT socket PCB, and remove the socket PCB from the neck of the CRT. 5. Support the CRT and remove the four screws that secure it in the display swi vel support. Remove the CRT form the monitor cabi net. .Remove the grounding spring from the CRT. REPLACEMENT 1. I nsta 11 the groundi ng sp ri ng between the CRT upper 1eft and lower ri ght mounting tabs. Then position the CRT over its mounting holes in the display swivel support and secure it with the four screws removed in Step 5 above. 2. Insta11 the CRT socket PCB on· the neck of the CRT. Connect the ground lead from the CRT grounding spring to the CRT socket PCB. Refer to Figure 2-10. 3. Install connectors P3 and P4 on the video PCB. 4. Reconnect the f1yback transformer anode cap to the CRT. 5. Perform any video alignments necessary. 6. Rei nsta 11 the back cover on the mo.nitor. Cover Removal and Replacement procedure. 2-24 Refer to the Monitor - Back SECTION 3 ALIGNMENT INTRODUCTION The alignment parameters presented in this section are to be regarded as guidelines only and not as specifications criteria. Video alignment of the QVT-102 is divided into the following alignment procedures. Note: These alignment procedures may be performed in any order. .- Horizontal Display Width, Vertical Display Height, Display Centering (Raster Tilt), Horizontal Linearity (Uniform Character Width), Vertical Linearity (Uniform Character Height), Bri ghtness, Focus. TOOLS AND EQUIPMENT REQUIRED The following tools are required to perform video alignment of the QVT-102: - Phillips Screwdriver, - Small, Slotted, Non-metallic Screwdriver, - QVT Alignment Tools Set (Q.P.N. 84841-XX), • Display Template (refer to Figure 3-1a, Q.P.N. 84841-01), • Vertical Template (refer to Figure 3-1b, Q.P.N. 84841-02), • Horizontal Template (refer to Figure 3-1b, Q.P.N. 84841-03), (A metric rule may be used in place of the above three templates.) .7/64 inch Alignment Tool (Q.P.N. 84841-04), - Multimeter (for brightness and focus alignment procedures), - Oscilloscope (for focus alignment procedure only). 3-1 W I N // .".... "", / '" (,0 c::: -, I'D W I t-' OJ .0 < -l ;,:. ..... ~ (,0 ::s :3 I'D ::s rt -l 0 0 ~ (I) (/) I'D rt C (I) '"C ~ OJ Co< -l (1) 3 '"C ~ OJ rt I'D . ." .0 :z 00 5mm I--. 00 + ~ ~ t-' I 0 ..... '- "', DISPLAY SIZE: 155mm + 0- 5mm x 213mm + 4 - 3mm V 786-A ALIGNMENT -N......I >-0 .... ~s: <t:a: ~~ -u -I<t: HORIZONTAL LINEARITY TEMPLATE -I a: <t:<t: ....Zu ~ oN a: o ~ " H" TEST PATTERN AS VIEWED THROUGH TEMPLATE WINDOWS VERTICAL LINEARITY: 4.65 "t O.4mm (CHARACTER HEIGHT) VERTICAL LINEARITY TEMPLATE 787·A Figure 3-1b. QVT Alignment Tools Set (Vertical Template, Q.P.N. 84841-02; Horizontal Template, Q.P.N. 84841-03) 3-3 ALIGNMENT ALIGNMENT CONDITIONS All alignment procedures should be thoroughly read and only performed under the following conditions: - Warm-up. Allow the terminal to stabilize at its operating temperature; approximately ten minutes. Refer to the Moni tor - Back Cover Remova 1 and - Back cover removed. Replacement procedure. - Local Mode. Configure the terminal for local mode operation. - Standard Vi deo/Reverse Vi deo. Perform a11 ali gnment procedures in the terminal IS normal operating display condition. - "H" Test Pattern displayed. The terminal has a built-in test pattern that displays a full screen of "Hs," and identifies the firmNare revision level. To display the "H" test pattern, simultaneously depress the Ctrl/Shift/Setup keys followed by the zero key. Refer to Figure 3-2. CAUTION 3-4 ALIGNMENT 11 ± 3mm (EACH CORNER) 9± 3mm FRONT BEZEL 213mm +4 -3mm KEYBOARD FIRMWARE REVISION LEVEL 155mm +0 ·5mm LOGIC PCB FIRMWARE REVISION LEVEL DISPLAY DIMENSIONS 4.65 ± OAmm - - - - ' H ~2.1±0.3mm CHARACTER DIMENSIONS Fi gure 3-2. 77S-A The "H" Test Pattern 3-5 ALIGNMENT VIDEO ALIGNMENT PROCEDURES Video alignment of the QVT-I02 is accomplished by adjusting one or more of the adjustments illustrated in Figure 3-3. Each alignment procedure is described below. - INDUCTANCE YOKE CLAMP LEGEND VR50I VR502 VRI5I VRI52 and LI5I LI03 LI02 KI and K4 Rings and Clamp Fi gure 3-3. 3-6 Vertical Display Height Vertical Linearity Brightness Focus Horizontal Display Width Horizontal Linearity Test Points Display Centering Video Alignments ALIGNMENT Horizontal Display Width (line Width) Horizontal display width is correctly adjusted when the width of a line of Hs in the "H" test pattern measures 213 mm + 4 -3 mm. If adjustment is required, proceed as follows: 1. Display the "H" test pattern (Ctrl/Shift/Setup-Zero). 2. Measure the first line of Hs with the Display Template (Q.P.N. 8484101). Tape the template to the front bezel so that it is securely held in place over the display screen. A metric rule may be used if the template is not available. 3. If adjustment is required, rotate inductor L103 on the Video PCB (refer to Figure 3-3) with the 7/64 inch Alignment Tool (Q.P.N. 84841-04). Clockwise rotation of L103 increases line width and counter-clockwise rotation reduces line width. Vertical Display Height Vertical display height is correctly adjusted when a column of Hs in the IIH II test pattern measures 155 mm + 0 - 5 mm from the bottom of the status 1i ne to the top of a an H character on the fi rst 1; nee I f adjustment ; s requi red, proceed as follows: 1.. Display the "H" test pattern (Ctrl/Shift/Setup-Zero). 2. Display the status line (Set 5 Status Line selection, or ESC}). 3. Measure the display height of a column with the Display Template (Q.P.N. 84841-01). Tape the template to the front bezel so that it is securely held in place over the display screen. A metric rule may be used if the template is not available. 4. If adjustment is required, rotate pot VR501 on the Video PCB (refer to Figure 3-3) with a small non-metallic screwdriver. Clockwise rotation of VR501 increases display height and counter-clockwise rotation reduces display height. 5. If desired, blank the status line (Set 5 Status Line selection, or ESC {). Display Centering (Raster Tilt) The display is considered to be centered and not tilted when the bottom edge of the status 1i ne and the top edge of the fi rst 1i ne of Hs in the IIH II test pattern measures 9 + 3 mm from the bezel, and the left and right edges of the pattern measures 11~ 3 mm from the bezel. If adjustment is required, proceed as follows: 1. Display the "HII test pattern (Ctrl/Shift/Setup-Zero). 3-7 ALIGNMENT 2. Position the Display Template (Q.P.N. 84841-01) over the "H test pattern. Tape the template to the front bezel so that it is securely held in place. A metric rule may be used if the template is not available. II 3. If a display centering adjustment is required, rotate the centering rings (refer to Figure 3-3) on the yoke of the CRT to center the display. If a gross centeri ng adjustment of the di sp 1ay is requ ired, loosen the i nductance yoke clamp and verify that it is as far forward as possible on the neck of the CRT. Re-tighten the clamp, being careful not to over tighten it, and then repeat the centering adjustment with the centering rings. Horizontal linearity (Uniform Character Width) Horizontal linearity, or uniform character width, is considered to be properly adjusted when a sampling of measurements taken at various locations of the "HI! test pattern, reveals a character width of 2.1 + 0.3 mm. If adjustment is requi red, proceed as follows: 1. Di spl ay the "H II test pattern (Ctrl /Shi ft/Setup-Zero). 2. Measure character width at five locations in the test pattern (near each corner and the center). If the Vertica-l Template (Q.P.N. 84841-02) is used, proper character width will appear too large for the Minimum window and too small for the Maximum window. A metric rule may be used if the template is not available. 3. If adjustment is required, locate inductor LI02 on the Video PCB (refer to Figure 3-3). Using a small non-metallic screwdriver, rotate LI02 clockwise to increase character width or counter-clockwise to reduce character width. Vertical linearity (Uniform Character Height) Vertical linearity, or uniform character height, is considered to be properly adjusted when a sampling of measurements taken at various locations of the "HI! test pattern, reveals a character height of 4.65 + 0.4 mm. If adjustment is required, proceed as follows: 1. Display the "HI! test pattern (Ctrl/Shift/Setup-Zero). 2. Measure character height at five locations in the test pattern (near each corner and the center). If the Horizontal Template (Q.P.N. 84841-03) is used, proper character height will appear too high for the Minimum window and too low for the Maxi mum wi ndow. A met ri c rul e may be used if the template is not available. 3. If adjustment is required, locate pot VR502 on the Video PCB (refer to Figure 3-3). Using a small non-metallic screwdriver, rotate VR502 cl ockwi se to increase character hei ght or counter-cl ockwi se to reduce character height. 3-8 ALIGNMENT Brightness Display brightness can be adjusted as follows: 1. Clear the screen of all data by depressing the Shift and Clear/Home keys. 2. Rotate the external brightness control on the display module pedestal fully counter-clockwise. 3. Locate pot VR151 on the Video PCB (refer to Figure 3-3), and with a small non-meta 11 i c screwdri ver, rotate it unt i 1 the back ground raster is just visible. 4. Locate test point K1 on the Video PCB (refer to Figue 3-3) and measure the DC voltage between K1 and ground. Note: This voltage may be a positive or negative voltage. Record the voltage observed. 5. Rotate pot VR151 to reduce the voltage observed between K1 and ground by 2 volts. Focus Display focus can be adjusted as follows: 1. Display the "H" test pattern (Ctrl/Shift/Setup-Zero). 2. Set the oscilloscope controls as follows: - Vo1ts/Div ••••••••••• - Ms/Div •••••••••••••• Coupling •••••••••••• - Trigger••••••••••••• 100 10 DC CHI - Connect the signal probe to the junction of R154 and C156 (test point K4) on the Video PCB (refer to Figure 3-3). Connect the probe ground to ground. 3. Locate inductor L151 on the Video PCB (refer to Figure 3-3), and with the 7/64 inch Alignment Tool (Q.P.N. 84841-04), adjust LI51 for a sine wave having an amplitude of approximately 250 volts peak-to-peak. 4. Locate pot VRI52 on the Video PCB (refer to Figure 3-3), and with a small non-metallic screwdriver, adjust VR152 for optimum focus at the center of the di sp1ay. Opt i mum focus occu rs when the i ndi vi dua 1 dots that form a character are well defined and clear. 5. Observe the scope and record the voltage offset between the negative peak of the sine wave and the ground reference. Record this value as amplitude "A ". 6. Adjust pot VRI52 for optimum focus near the corners of the display. 3-9 ALIGNMENT 7. Observe the scope and record the voltage offset between the positive peak of the sine wave and the ground reference. Record this value as amplitude liB ". 8. Subtract amplitude uA" from amplitude uB" to obtain amplitude "C". is: B - A = C. That 9. Adjust ; nductor L151 unti 1 the peak-to-peak voltage of the sine wave equals the value of amplitude IIC II • 10. Adjust pot VR152 until the negative peak of the sine wave is offset from the ground reference by the value "A". 11. Observe the screen display and visually make any fine adjustments necessary. 3-10 SECTION 4 PARTS This section presents an overall exploded view diagram of the QVT-I02 for parts identification, followed by a list of recommended spares. 4-1 !l "~ ~)~ ,, ® @2 4-3 PARTS ITeM FRONT PANil.. IC,OOI Tuall 1000~ WA~MEI>. 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IO,02~ NUT .... 3 x • • :1 x 1-41.4 l( ""1:1&00000108 MA8 <OOo!>%oc. ,q 10,OZ'l 5C.R&W "'~T"">(e. x ~c 'O,021!o :lc.",.w..."XO.!>". l( ;1 1002<- Hi"T aOTTo.... U e."8 ~INK 12 10,027 ~~ 10,OZ!> vR ~4 IO.OZ.... .~IO. 35 :!l> 10,030 1".-1 lalNc. ..... 4 X0."7 x 10 IC,C31 (C.'SIINK) '0,03:1 NUT NO. 4.40 UNC- ....A.. i1.000n.0. x FaZTI010001 X I"e.0000 "70001. X MA" 4000 110"1. X .... CZOOOO0701 37 e4~OI-O' \/Ioao pe.a V8-oil. I>. Ii V /loB 0"" T 101 V 10~ 64600·01 1..0Co'e. OAZTIO"Z.L.IO!l 3'1 10)033 w".I-lER .... S (ex. 1..0l;K) 4C ·C,C;:. ~FU"W IC,OZ,.4 ~,,,.w .0.0... . 0 1...·4 Rav",e M5'T'1:l'A.}(IO ,." .....&ZOOOl100 xa >( M"8'1000~0," M5"Tg.. ;0,03~ &ATT&IlV 1001..& (-) lC,O;ft;, ....T"'.RV POL.E IC,C2~ NUT .... SXE!ll:i.5)( 1-42.4 4!1 1OC!? Wtl'OU~D 4£, CC.3e " 4~ lCjO~e, " (~) " Pl..AT. "'I; Sooooo 101 i:I=OZTIO~ loe i:I"OITIOZ'OS MDZooooO/06 S'''llw M!TPA x II )( . "... W(C·TVP. e.ONN) )( ""...... $000<104 10,040 IiSC (pl.. ...T£\ x £.IOT 10Z"Z.01 .. IN~UI.."''''IONI''II..M IESC) )( £1..10005000" IC.OZ4 ~e.IIli:W M~TP"" x M ...e 20005Z0," IO;O!:~ wA!t.... 52 IO,OZ3 NUT M3)( 6S.5 5;1 IO,::'A'Z SWITC.)··UNc.. PowlIR • 84&04·01 A!oIT&C. - Ac::.&I'S1 ~. IO,01.~ S~ 10,0.1' ", 5"1 e" (EX 1..0"".....) ... &W ~c. 10.0'.3 Pc.~ -_ow. xe. )It ~ N1~ i.4 NuT "'-43 x as.s )( I-t 2 .• ""AS..... '1 (lEX 1..0e.><.) ..... !o 10 0.:1'- ..... :lTP'"' )( 10 "'81 x 'NC'C....Te.':l ~PE<:.IFIItC. TO 1>URC.WA.Se. ,ROM VSNOOR(N:lT A -::;.:",.a. ~A,I!:"'), .....11OOI8Z0! 10.=41 '0 WOTES: UNL..==!o OT.... ERWI~. m el'IOTIOZI04 48 4., Rep lacement parts are limited to those listed on the Recommended Spare Parts List. F"MT 101.000. KNoe r.c........ w N ...Mll NOTE 1..e.04 0000 10," ~a 43 _ _ _ _ GIl C&!o'-",PTION 10,001 10,00' '1 cae.c.p.IPTIO .... QUMEPN 10,000 ~I!VO "X MC.~OOOQQIOI Nt 0 %00000 10& )( I:)~TIO'2 POOOI l( ""0 ZOOOOOIO& X ..... C.300oo0101 _ PAPTS LIST MAe. Z.OOO 1Z0C O..I..T 1020005 ./........ l7 : ", .... _ - 0t .J-2/ 84826 -01 A Figure 4-1. QVT-102 Exploded View Diagram (Cont) 4-5 PARTS RECOMMENDED SPARE PARTS Table 4-1 identifies all QVT-102 recommended spare parts. Table 4-1. PART NUMBER I 84807-01 84804-01 84805-01 84800-01 84800-02 84806-01 84803-01 84803-02 84811-01 84801-01 10028 10244 10281 10146 95855 95803 Recommended Spare Parts DESCRIPTION Brightness Potentiometer Assembly Power Supply Assembly AC Line Switch Logic PCB Assembly, RS-232-C Logic PCB Assembly, Current Loop Battery, RAM Back-up CRT, Green CRT, Amber Keyboard Assembly Video PCB Assembly Brightness Potentiometer Knob Coiled Cable Assembly, Keyboard Wiring Harness Assembly, Main 2764 EPROM, IC U8 8748 Microprocessor, Keybo~rd Character Generator EPROM, US QTY PER 1000 15 25 15 25 5 10 5 3 25 25 10 5 5 5 5 5 QTY PER 10,000 50 150 50 150 10 25 25 15 150 150 50 20 20 20 20 20 4-7 SECTION 5 CIRCUITS AND DIAGRAMS The following circuits and diagrams are provided for reference: - Functional Block Diagram, Interconnect Wiring Diagram, Keyboard Schematic, Video PCB Schematic, Logic PCB Schematic (5 Sheets). 5-1 CIRCUITS AND KEYBOARD PCB ASSY. 8748 ~ I A IY .. MICRO PRO· CESSOR 6116 SCREEN RAM ~ II' H BUZZER I ~ ~ TC 5514 f~ BATTERY J NON· VOLATILE RAM TC 5514 NON· ... VOLATILE 3V RAM ~ L-..fL6845 CRT CON· TROLLER 1/4 I'c' PERIPHERAL ~ r ~ I-- 6850 UART , ~ EIA PORT ~~ ~ CRT > t I'GND 2764 PROGRAM ROM " AUX PORT 6800 MICRO PROCESSOR KEYBOARD MATRIX ~ LOGIC PCB ASSY. DATA HOST VIDEO PCB ASSY. .J 2732 CHARACTER GENERAT1R I I I J HIGH VOLTAGE CIRCUITRY VIDEO SIGNAL CIRCUITRY Ll03 HORIZ. SIZE + I<:-- ... Z 80 CTC ~ VIDEO CONTROL LOGIC VIDEO H. SYNI: VsYN I BRIGHTNESS CONTROL HORIZONTAL CONTROL CIRCUITRY J t I VERTICAL CONTROL CIRCUITRY J L102 HORIZ. LINEARITY I--- +5V POWER SUPPLY -12V DIAGKAM~ _II VERTICAL VR502 (I VR501 VERTICAL SIZE ~ , LINEARITY VR151 BRIGHTNESS - I VR152 STATIC FOCUS VIDEO DISPLAY ADJUSTMENTS Figure 5-1. I I L1Sl DYNAMIC FOCUS I 23108 QVT-1D2 Functional Block Diagram 5-3 ~iKCUlrs EIA PORT .1. AUX PORT . ...! .J.- FUSE~.n .1- -, BLAr:K I I I I VERTICAL DEFLECTION TOP4 ON VI OEOPCB CRT YOKE {~ 0 BLUE I I HORIZONTAL DEFLECTION ll.. RED II BROWN } CRT SOCKET PCI "'~ 1<2 ( I ~ ~ i ~ ~ ~ K4 i ... ~ I 't1 0-E! I K2 3 4 _ RED I!! if; P2 LI"'I. .::: n P3~ +:tv: + ;'v' PI 021)3( 4 )\ VI i ~ ( 1<8 1<7 KS rg~ TO CRT YOKE .~ IBROWN TO CRT YOKE ~ SHIELD '~ Ie') (~ II: ..., ~~ I I i .~. 1:1'1 I I BLACK P13 «3) (4)/ P12 /6 l 01 /6 l «2) 3) 01 I +SVDC 1 .... IvELL OW SIG~~b 2:; IBLACI( BLUE !!!2.. . ~':a !!!!m ··· .. .- ~ I ~ !.lo:S!: --. ~ WHITE I I r i I I I I __ ..JI I ~~ II I It I I I ... !: I I I I I I -. I L_~~~ _________ ~ :t: m,~ II j I .J) ... ~ i i RED I- GND I I +12VDC 4 ~ +5VDC 3 - WIPER ~ .. ft , POWER SUPPLY WHITE P14 GND RED .,2VDCG I feEL~~~~~~~ I' '-.--I '; ~ FIL TER PCB I n ~ Jf[;;g}~~"ow) .1'\ f if +SVDC ~ ,~ r-:::::::::::.. VIDEO PCB (VIOEO) iW ..g< ~ BROWN IGVI 4 .X- l.- ~ IV SYNC) p,o i /" !"'" r K3( ~ WHITE IH. SYNC I 8LUE (GH) ~Iol WHITE '-'-' '-- 1<1 REDI ,.....I i ~ t ~ >- j BLUE r ~ ...-' ... : I I I I I I I ~I ~ ..... K3 ~NR~~N 0 I wmTeL--J)J 1<4 IBLAC:I IWHITE I IV CHASSIS 0 POWER ON/OFF SW ~~I1------- q)ll '-------t__ ~_[ __ J____-,. ;- I IT" Q~ GND V BLACK t I TOP3 ON VIDEO PCB CRT ANODE CAP TOCR T GNDSPR ING LDGICPCI I ~WER CORO ANU OIAGRAMS ~ASSIS [ )~GND2 7U BRIGHTNESS POTENTIOMETER WIRE BRAID TO CRT SUPPORT I 227·8 KEYBOARD Jtl!§J ~!1.~«ff Figure 5-2. QVT-I02 Interconnect Wiring Diagram 5-5 CIRCUITS AND DIAGRAMS 56 w308 R311 3.9K R310 IK PII '--..... R308 5.6K Q304 25C9'15 +516.:0 4 R309 IK \ \ ·5V +5V :W31O ·5V / ~"'7"E--""""'-'--------+-o4-<1·' 0301 IN4148 0305 Hi!4C-3 4.3V C311 O.l"'50V CAPS CTRL SHIFT +5V NCTIO"- , UNLESSjTHERWI'3E =F::CIFIEC t5V I.~LL ~ESISTORS ) R310 10K w310 N'T ~R:: ::XPI\::::~::[o IN Ct-<~,1C;, 1/4W,!S%', IN~,TALLED. 6I lD (\j OJ "" 0) RP301 lOOK ,laX) !20% I I I L VI -:]0_0 _ ~OMPgl~l,f; M~R.lXJ-8.Y.QIJ..T~ Figure 5-3. QVT-I02 Keyboard Schematic 5-7 CIRCUITS AND DIAGRAMS CI07 470.u35V + 0107 RIIO 0.2 IW CI02 470'" + 16V AI02 RGP30G 18K:5~ AI04 2.7K + ~¥.~ 16V 7 .S; + CI05 'lOO.u I6V 1r:.-3~ 0~2 CIOI V O~I H V 04 ~~I 0103 IN4148 S_~-2 ... .Olu SOy: C501 .1... 50V CI03 r2)..JJ QIOI ~ AI03 10K RIOI 820 Ff~ ~ 2SA733 r-A504 1.2 III . VR502 IK CI04 C503 22.u.16V ITANI Y2 "'" -.;:- , Z It fU,~ ~ 168~+ 16V P.SOS 0501 IN4148 P.509 47K ~~~~4S rF IK R510 5.6 I OS02 IN4148 Q~d 250882 ,~S-2 1: I R5S4 2W ~ DO. 16V ,~ \Q504 ~ 12S8 HS-3' /772 I I : .08~ i' ~ R553 21 I I I J2.w Y./...,.: I A551 330 SGI Hi!7A-3 ~ rn: ~ ()j( I I I C553 0l.lt25O\l rn QS51 250666 I I 10K J2.l11 COIL ·'' ' tr" K61K6' I I rn R558 0 '"' ' 3.3.u1 I I l1] R559 R556 100 Y,.w I ~7.<.< C552 47JJ63V ~:s55\"" I I I • 820 I I I I K4 K4-: I I I r _____ JI I I K2 K2' KI I I KS'K5 :F\552 I IK I r--------Kt----------I 0 ~ 7:3-G1IIH 630V -~ YOKE: A513 ... , FlSI4 470 0.6 2W R5I5 0.6 2.w CI53 .22... K3 I I ,~""" , P4 .J RI54 lOOK .liw DYNAI.1I C FOCLE N.t I L _ ~ _ __ ..JI Q lID IlJ RI53 120K I .. 3.5loH ;J.M 25n. r ------., I A50S 41K ~~:~~T- .01'1. -sov 0153 I I : I :x: oJ e_ ::l:ll R512 470 01 02 P3 2-:x: I: F\511 ISO '-" Claf,,1OOOV CI55 22.u ~81 l -¥ R155 4701< STATIC FOCUS VAI52 .01~1000V :3 liOv e, 50V A506 200 56K 0 CI54 RI52 330K C152+ CIOS 12u 35V 0106 IN4 148 :~.047 ... V.LIN. C505+ 22" 16V I TAN,) J • CI51 ; 47JJ 63V lID AGP5040 AI08 56.1!2w RS07 8.2K R501 2K A502 RGP 15J 400V 0154 ~~40 0152 RGP5040 FIlS!' NP. 0/05 +l c509 .1.'500~ 16V C504 033i i~ QI04 ,Bu408 ~~e-3 2~.u16V 820 CS02 47..... 35v JQQK .n"'l "i7nV HS-I J<.Iw WVRSOI 20K v, SIZE + ~~3~ 001 0109 0104 IN 4148 1N4I4E FlS03 10K ,~ 3:1 ~ 5.6 H Gtt V GV VIOE O~~ .~llr IV' ) 2SC~~~ R 16 P 01 f021--03 04 AI07 IK : Ii Ng~ CI()g ~ TI PI I '--' I 6 IN4007 AI09 56.5W AI06 560 AIOS IK 0101, T2 4. I I I I SG2f f-f J I I -!-~l.-:O;---:UQ552 2SC 1730 ill R555 62 S'LYuv : I I H : I I CAT 12" 90· - I I I I I I I I I I K7L!<?' __________________ J NOTES: UNLESS OTHERWISE SPECIFIED I. ALL RESISTORS ARE EXPRESSED IN OHMS.I/4W.=/%. l1]CARBON CQtAPOSITION OESISTOR. Fi gure 5-4. Schematic 5-9 CIRCUITS AND DIAGRAMS A 48 IK A 44 220 A 45 3'0 U 35 74lS04 ,--"'V\/'lr-.,--JI/I".,.-.,--.J\I'V\r-_--..-.,5 YI 16.6698 UHz OCT ClI< f> A49 47K C 41 20 P, SOV SH S U38 74lS04 '----101-1-----ll~------' 3 EY 4 CATC Cll< SH5 SH 3,4 U38 74lS04 I l:l. 2 SH 4 +SY A58 4.7K +5Y A59 680 .5Y § aVPASS CAPACITOA - .IIA/;ov: 37PLCS ITOTAll +5Y SH 31 4 22,u/16Y: 3 PLCSITOTAll A60 680 101A/25Y; J PlCS fTOTAll +5Y +5Y ~ SH 2,3 U 23 7402 -12Y -12V SIG GNO 51G GNO C24 .1 soy + 5Y -= +5Y (5 I ... 12V +12V .n C\J CO e:;t CO UNUSED GATES 'l 74lSIS7iUII 74LSOO 4 74LS32(U41~ 1'4 74LS08 IU2'll -= ~ 2 5 74LS04 iU25~ 74lS04 {U38~ 3 G • (U411~ NOTES: UNLESS OTHEAWISE SPECIFIEO I. ALL RESISTORS ARE EXPRESSED IN OHMS,1/4W,:!: 5';". 2. ALL CAPACITORS ARE EXPRESSED IN MICROFMlADS. CONTINUEO ON PAGE 2 Figure 5-5. QVT-I02 Logic PCB Schematic 5-11 CIRCUITS AND - DO 07 SH ;, TXC RXC SH 4 SH 4 A SH ;, SH ;, SH 5H3 SH3 , U2 1489 IZ 13 CT5 IT R£o 4.7K DCO 8·2 st+IC. L.OUT ...... ~ ...... D5R ~3(_IC 03 DZ L+[ DO f7 RIO 10K 21 01 IRQ TloV +1 C9 7 22 SOV VCC CS~T~ IRQ 7 'n 5 23 J9 AU x .n o,n 6 2 J9- +5\1 +t2V ~'2 "-( U;' 113 R16 ·5v 4.7K - i·· +5V @R17 240 v ZOO tIIZWI 0_- ·A-- \ nllT 1'... - C I A 5 ."'~" IN414 C945 I •I @UII 4N33 I 4 (iRIS 12K @WIO @Q2 C945 2 )-- ~ & (i)R19 Z20 K III @R4 2.2K TXD 3 I ~rd 10001',50 ~~ 330~ 06 5H3 SH 3 2 U3 ~o 1488 2 C4 330P,50V ~ D [, DTR 6 W3 -llV SH 4 DTRI @R9 ~"2V 200 ~: 03 'N4001 04 ''"..;001 ~ + IZV U3 I 1~5 7:1 (i)w C;'-iC.L.IN 1>.W..2 .L 1 IW f@05 IN414S t 't: HlSC-2 !@ RI! f@D& 5.1 K ~ I 4N25 ~ )2 6 @RII 220K AUx"EN. -=- (i)R30 IK 4 I 1··~ r 10K :- : t- 6 -- '- lCI4 ~330P,50V 6 J~-7 ~ DTR ;!!:20 II">... 3 L-J2 ~:S9 DTR2 R8 47K - SH 4 UNcESS OTHERWISE SPECIFIED. 'SV 3. FOR RSZ3ZC ONLY OMIT THE CURRENT LOOP COMPONENTS (LABELED@1 AND ADO THREE ADDITIONAL JUMPERS NUMBERED W24,WZ5,WZ&. @Q4 C945 (!)R 28 IK :~ ~xO.:!2·3 74i:'S3Z + 5V @W8 SH 4 I U4 NOTES, @R12 270 ;1 :A : W:4~ U3 1488 1488 @R14 At 9 I 'V2WI D(+IC,C.IN 'l""~. ~ * @UI 74L5157 G:~ J9-1 74LS32 10_ y!19 @lUI 74LSI57 74L5157 GND ~ 74L532 1..-.... I ,15 II 12) U4 '-- C 16 330P, SOV r~ 4.7K UZ7 74LS74 5 "i, 0 W4 &-20 13_ '5V wJ5 .~~~~ '= 4 rff!itJ o '6 l!15 3 CCK Q YCATCH RXD ~~4_ 1.. 411~EL (j)~~C Al_!WII ~ (i) RS 4 7K @R3 =. ..!K +5V I (i)W14 r (i)w13 ..... .. S'V +5V EIA/el. SH4 SH,3 V55h r~ 8 1 ~ - OSR :.7K f;r- ~ J9-' CH.GNo C5 RT5 D 04 UI& 6850 124 U2 1489 8-8 8 4.7 K II ~1°P'SOi .!;4 ttL J8-7 ..... 5IG.GNO 9 10 CSI ~~4 +5V +5V 17 05 ~5Z %850 All IA ...... 1& 0& 14 RS 18. J8 !:..5 15 4 TXC 07 3 13 -RXC II R{W RtW AD DIAGRA~S .~J U25 ~~ 4,~:~ :~:::; ~~~ ;:g~ ~:~; ~~~: \W3 EIA'S DTR FROM TERMINALS DTR. W4 EI .... S OTR FROW ACIA'S RTS. S ACTIVE. CONNECT JUMPERS W5, W7,W8,WII,Wt2,WI4. PASSIVE: CONNECT JUMPERS W&,W9,WIO,WI3. CONTINUED ON PAGE 5 .. I ., c 0 " . . _:.r.-:.=- ~ "-E}-... _1",~""rauuIIlCIIMI: Figure 5-5. BAY TECH 2-'4-83 -- .. mIT QVT-t02 SC LOGIC B QVT-I02 Logic PCB Schematic (Cont) 5~13 CIRCUITS ANU ~2 SHI U24 2 I ~lS368 A I~ 2G R2D 4.7K 2 +- ----i ~~LJ --lI- SHI )'J6 !e'IC--_ _ ..l.f'11 R22 4.7K 6 8 ~J~ + 511 6800 U43 ~ S I t-- SH4 KIRQ SH2'1lm U3D 74lS32 13 ,.. 4 28 211. IYI p"&i-_+-...- --.:L;U2ll-__ All,,,, V ~~~S~~ 74lS139 ~& --'1c:t ;La TP ~~~ p!~~~1---+-+--------------------!E:!:---t. IY3 ::~t~"3t:===:::::1:===_J~'i.!:~:--.2~.!:~~~;L-1 RS7 L~ ~ _+- 2Y2 2 2YD 1)i:1lfi-- u9 NMT ";IS 11.14 r - _......._-J\j4·7K.;...-_ _ +SV :~I..IIIAL2-----'"""I 111,L7------.. A81-1 Ur.;;: t 11.6: :: R21 4.7K U34 ~'»O..!JI~"---,- ......-..:!4dlRQ 7416 5V 11.510'+ 11.4 I,~ :: I" AI '" AO I .i2c C~I 2 28 AI2 - ... DiE RESET RI'if ~~~ IISS L 06 I.. 18 06 17 05!Jr?:L.. .. ---.:I-__lI_-l..LI OS U8 04!J,.o.z.... _---~__l1_~16 04 2764 02~[:\~~--_~~1__-~113 02 ~0~O~-V:U2r.i41~r_....-~11 DO AI OE 22 ~ A3 A2 Phl.L.. ---~~I__-~112 01 6",7 ~ A81~:I A7 A6 AS A4 031--1:l.\jI'I\,L.-_ _~I--I-_I~S03 01 V~~DI:4 A9 07!Jr;OL.,---...--::t1-....!%.I19 07 4~~ ~ 23 10 !" ~ ~2 ~ + uIAbKAM~ AO ~ "~ Is ~ ~ ~ ~ ~>S~368~-.-II~~:iI"I';"~?~iZ7!!-.. .qwrl~;26;] +SII 5V • RS6 R5S 2K 2.2M .....£..j2 TR ~~~3K 1 u.o - ~~ RIW U3S 74lS04 , OUTI"3 50[-; TH -.L.f 9 ." CURSOR~I..I:~ Ci.9.-------------------------~ia2ia.... :~~ '"~'-------------------------.2JL---l .. 2& E ==:ii ~: 1-'1 ~OS 6~~~ ~04 7 DISC CRTC ---;-; 03 I C47 . -_ _-_-_D_.I,_5_0V I C46 -: D.I, 50V SH I CRTC ClK BYP ---J1 GNO 5 ~ =:=li33 ~~ P 3 00 lPST8 I 1155 ..!2JL!:!l:.--l. . 0ISPlAY·!-J1~8--------------------------Il~fl!lL. .... t---~f----~'"CliRESET U42 l IISYNC 40 HSYNC !-' 13U-'l ~RS VCC RES NES5S C48 1= I'I\~ CS I.. R:l4 lOOK ...... ::~ 1-'1~~87-------------------------....!!.~.... MA12~ flL MAl I 14::....-----" MAIOIol: MAg ",,'~"-----'" • MA8 .... 112~ _ __'". Mil. 71J.""-----'". MA61ol:ID~---,". MAS .... :-----" MA4 '7 MA31-'---.../· 6 MA21.11- - - - " . 21 eLI( H I---'Ii"I---l .-E]- BAY TECH 2-'K>oB3 I \..i!'----/". QVT-I c MAl 4 _ _---" MAO 1.:1 IICC 20 .r ._- j- ·· ·, ===.~.-- - -F ·-- ·· -- +SII I"', L Figure 5-5. QVT-102 Logic PCB 5-15 ~SV SHli , VDO-V07 1123 4.7K R/W AD IT~ IA 18 AI~ 2" A2 I~ 2T~ 2B 3A i>3~ 3B 4A 3Y~ UI8 74lS157 4Y ~ 4B~1 ~ <[4 L-....Y ~ A.4 IY~ 48 4A IA AS~ 2A 28 A"~ 3" UIS 74lS157 ~S I 41UL- ~ 3B"" I Aa~ I)t!!--J ,,9 AIO~ 2Y~ 3Y~ IB r.. I A7 IT~ IA 18 2A 2B 2Y\..L-..AM.t... 3A UIO 38 74LSI57 4A I~ 4B 5 G ~5 3yli !!!i 12 AMID 41 VCC !.'j AID '~ ~~ A9 A8 A7 A6 AS 1>4 A3 042 "I '..AMI.-' '.AYL.....J ~~ ~ G ~15 I .AY.Ill. ,,~ UI9 6116 Il"M 07 17 06 111; un? un.. 05 .. 114 04 113 03 un.. un. VM un, Vnn 0 .21 WE DE AD CS 8&~ ~i~ 1:: ~;~ >'& 87 7 A7 86 .. "6 ~ AS BS~ U26 "4 B4~ 4 A3 74 LS24S , A2 ,- "I BI , 011\ G 19 lin' ~~IIO :~I:; ~~~ ~ CNO ~8 ~2 SH5 nn_n? SH 2 AO-AIO SH3 SH3 MAO-MAIO 1- ~3 74lS32 SH I SH I r CRTC CLK :11 , 1_ ?lU30)J"74LS32 SH3 5H I ll57 ~ 9 10 741532 ,. an A U30 74lS32 ~ +SV--'24 00 Ln '0' 1132 4.7K '5V o elR PR 9 05 o Q U20 74lS74 ~ ClK R31 4.7K d '--- ~~ 2 PR o U24 7415368 SH3 5H2 SH3 SH3 SH3 yeTe -:-m . DTR2 00-07 Y lATCH I I .J 02 03 04 05 06 07 .a ClR .12V R36 1.2K UI2 zeO-CTC R35 IK tSV ~CSI + 5V R25 + 4.7K 6 ';1~D9 R26 4.7K 10RQ 11I1 L ZCITO liB 07 CSO -r ...-n 0 ~ VCGzClTO 7 ~CE 5 U20 741574 ~ClK SH3 ~ II -;; DO 01 ~7 02 '11 03 I 04 2 05 06 la ClK/TRG I 23 R~< .frlcK~J~Go~ 13 ji7¥ ~ I ..QQ.. 3 01 ~ ~ Clll R52 IK l Q5 04733 Q6~_A ~: 110 12 7416 ~J741504 +12V ~ oil:hIN4148 - KB SIG 1;W23 I },CH GNO "' TX'" AX'" 5H 2 5H2 16u24 74LS368 VCC -f>o-I!UV ':" ,? L. ~~7 1:~~Jp ~ <b ~ I U34 02 03 04 UI7 QI 2 05 74lS174 02 15 06 03 CLK 9 ~12V HZ4C-3 ~ ~5V 1".Jt~ 15 KIRQ SH3 -b 5tG GNO mxtR RV co ,..v 1'mSI <IA/I'T SH 2 SH5 5HS 5H2 5H2 1368 Figure 5-5. QVT-102 Logic PCB 5-17 SH 4 SH 3 " SH J RV CUAC;OR P6 ..Jk ~ 07 nSp TMG 1'121 ~:8 - 1'122 10 I ClK o UJ7 1 G Q u; I.. o7~l3;377 I '" I U46 ~;ZSJ71 Q o ,--- I U46 74S86 ... f U37 VCC Is o 74lS377 Q ~ 7;ir;? .h %6 o74lS377 Q VIDEO G) VSYilC GV +0 -= A43 ~ CD ~~ 74586 GH G) HSYNC ~ 820 .SV 74586 ~8 SH 4 U37 loa o74lS377 Q ~ BLINK SH I r5 I ~. 5 I 31 10 6 U28 II 4 74LS II 74lS04 10 9 74lS04 GI I I....- r - SH 3 n~1 n<~ '-,r 16 vn., ~ ~ ~ ~~ 13 o 6 ""~ VOS ~V04 14 DE 13 OS 6 03 ~OZ ~VOO H3 H3 H3 H3 C'i RA3 RA2 RAI RAO 3 01 q ." CU( -tSV Q6 I 8 '} U2S I1 '; U28 T 8 74lS04 --;0;: 1 19 AID 22 A9 23 AS / A7 . , A6 Q3 7 ~ ~ 27321 2716 741508 S A3 A2 21 AIIIV~C u32 9- J 1 42 DE 00 01 02 03 04 05 06 07 ~4 ~ U38 4 U24 V ~ X.!!_l 2 A 3 B C ,~ I vee 0 Cl'\/l ~ U39 74lS166 ClKI f I-=- .1SOV 1'115 vIDEO ~-I R40 300 HSYNC ~. 9 E F 12 G 14 H NOrc:S: UNLESS Q6 C.'730 ~ RSO 4.7K QH 13 ~2 -,. 74LSIO II Ih 17 416 .sv 4 14 ~l{ '--- 1 tOO'-1 - -- - I,,,> CEn I - ---, I 10 R38 100 CS2 330P RPI I 10K. I P6-3 C31 +SV j ":" I II 13 yc;v.;;: .IZV • II 7415 368 I - ":" ICS3 ":" 330P I I L __ IC43 I ":" SOY ":"25V T 1 ~16 9 - -- - - - - - - - - IC44 10 ASI 150 A42 330 Q ClA 3 II tSY 6- 7 A' 8 AD 1 4.7K 74lS04 -, 1'119 - U41 '74i:Soo ~-., W20 3 AS 4 A4 02 5 wi Z ...2.2 '74LSII lUS.t-~WI7 I~ '--...!..!. ClK 13 12 -.., 1'118 QS /2 Q4 10 U33 74lS174 U27 74LS74 74lS08 74lS.P 4.7K ClR ~O4 ~\02 10 U22 UZ3 7402 [, m··n7 SHl' 10 ~M'''~ Q S L.. U22" 12 HI l~ ~ °74lS37~ Q1 C945 3.9K 74LsOO R33 VSYN~ ~ ~ A% 3 21U41 .. ~y .. 1' II C4S .1 ":"SUV ":"SOV 74lS173 14 olr.., 1 @-I .h VIO~ SH 3 10 3 74lS04 OJls 04 12 13~; I 5 r ~ 74lS00 U38 13 QI U31 11 S U41 ClR 4 Q2 7 ClK DOT ClK . 11 r&' I P7 IS c;~lK 7 I ~ U46 U40 10 74LSIO U3S " 5 3 74586 U40 6 741510 ~~pl IfJ6p ":" SOV SOV ":" 13 74lS04 r C56 330P 50v OTHERWISE SPECIFIED. 6. ;1'121. ATTRIBUTE COOE IN HALF INTENSITY. (1'122. ATTRIBUTE CODE IN FULL INTENSITY 'WI7: SELECT US CHARACTER SET. \ \WI8: SELECT G.... CHARACTER SET.I IF C.G. IS 2732 (1119: SELECT U.K. CHARACTER SET.) 1'120: IF C.G. IS 2716. CONNECT THIS JUMPER 7. (58 MUST 8< CLOSE TO U46. C~6 & CS7 MUST 8E ClOSE TO U40. Figure 5-5. QVT.I02 Logic PCB Schematic 5-19 I QVT-102 Maintenance Guide Reorder Number 35007, July 1983 REQUEST FOR READER'S COMMENTS Qume Corporation attempts to provide documents that meet the needs of all Qume product users. This form lets you participate directly in the documentation process. 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