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Shure Incorporated 222 Hartrey Avenue Evanston IL 60202-3696 U.S.A. T Wireless System SERVICE MANUAL CHANGE NOTICE T1/TC1 WIRELESS BODY-PACK TRANSMITTER Changes and corrections have been made to the Service Manual for the T1 Body-Pack Transmitter. To update your Service Manual, remove the pages identified in the tables below and replace them with the pages attached to this Change Notice. Note that there are no changes to pages not specifically identified in the tables below. T1 BODY-PACK TRANSMITTER SERVICE MANUAL REVISION HISTORY Release Part Number Date Code Color Original 25A1016 QH White Revision 1 25B1016 SB Pink Revision 2 25C1016 SI White Revision 3 25C1016 TL White Revision 4 25C1016 AF White Revision 5 25C1016 BA White Revision 6 25C1016 CC Red CHANGES EFFECTIVE MARCH 17, 2003 REMOVE these pages from the T1 Service Manual INSERT these new Revision pages into the T1 Service Manual Page 22 Page 22 E1999, Shure Incorporated 25–1016–1 (CC) Printed in U.S.A. T1/TC1 Body-Pack Transmitters 25C1016 (CC) Characteristics General This section tells how to service and align the T1G, T1, TC1, and the discontinued T1P Body-Pack Transmitters (Figure 1). These single-channel, crystal-controlled units operate in the 169 MHz to 216 MHz VHF Band. ÁÁÁÁÁ Á ÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ Á ÁÁÁÁÁÁ ÁÁÁÁÁÁ Á ÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ Á ÁÁÁÁÁÁ Á ÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁ Á ÁÁÁ ÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁ Á ÁÁÁÁ Á ÁÁ Á Á Á ÁÁÁÁ ÁÁ Á Á ÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ Á Á ÁÁÁÁ Á Á ÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ Á Á ÁÁÁÁ Á ÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ Á Á Á Á ÁÁÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁ ÁÁ Guitarist T1G and TC1 Trans- ÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ Á ÁÁÁÁÁÁ Á ÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ Á ÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁ Á ÁÁ Á Á ÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁ ÁÁ Á ÁÁÁÁÁ Á ÁÁ Á Á ÁÁ Á ÁÁÁÁÁÁ Á ÁÁÁÁÁ Á ÁÁÁÁ Á ÁÁÁÁ ÁÁÁÁÁ Á Á Á Á ÁÁÁÁÁ ÁÁÁÁ Á Á Á ÁÁÁÁÁÁ ÁÁÁÁÁ Á ÁÁÁÁ ÁÁÁÁÁ Á Á Á ÁÁÁÁÁÁ ÁÁÁÁÁ Á ÁÁÁÁÁ Á Á Á ÁÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁ Á ÁÁÁ ÁÁÁÁ Á ÁÁ Presenter T1P Transmitter (discontinued model) Presenter T1 Transmitter mitter 1 2 Á Á ÁÁ Á Á ÁÁ Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á Á ÁÁ Á ÁÁÁÁ 4 3 Figure 1. 1. Phone jack 1/4Ȃ (guitar or headset input) 2. Antenna 3. Tini “Q-G” (Lavalier, headset, WA302 input) 4. Lavalier microphone Service Note: Shure recommends that all service procedures be performed by a factory-authorized service center or returned directly to Shure Brothers Inc. Licensing: Operation may require a user license. Frequency or power-output modifications may violate this product’s approvals. Contact your country’s communications authorities. E1999, Shure, Inc. Printed in U.S.A. 25C1016 (CC) 1 Characteristics Shure T1 Body-Pack Transmitters Circuit Description The T1 transmitter contains one circuit board which comprises an audio and an RFsection. It is intended for use with the matching T3 and T4 receivers. Audio Section Input: Audio signals enter via a 1/4-in. phone jack, with the signal on the tip and the ground on the ring (T1G), an attached microphone (the discontinued model T1P), or a four-pin, Tini Q-G, connector (T1): S Pin 1: Ground S Pin 2: Supplies regulated 5 Vdc bias for electret condenser microphones S Pin 3: Audio input S Pin 4: 20 kΩ load resistor connected to pin 3 for Shure electret microphones Preamplifier Stage: This is centered in one section of the operational amplifier (U102C). An externally accessible potentiometer (R125) adjusts the voltage gain of this stage over a 40 dB range. Passive Pre-emphasis Network and Compandor: The network (R145, C110, C111, R112, and R115) has a pole at 63 microseconds and a zero at 1 microsecond. The NE571D integrated circuit compandor (U101A) provides a 2:1 logarithmic compression of the audio signal. Noise and Distortion: U102A lowers the noise floor, and an internal potentiometer (R130) nulls the system audio distortion. Operational amplifier U102B, operating as a two-pole, active, low-pass filter, restricts the bandwidth of the system to audio frequencies. Limiting: PNP transistors Q103 and Q104 limit the level of the audio signal leaving the audio section via U102B. Beginning in July 1995, this section was removed from the “A,” “B,” and “C” boards but left in a newly designated “T” board. 5 Vdc Bias and LED Drive Circuits: The NE571D’s identical second channel (U101B) supplies regulated, low-noise 5 Vdc bias to various audio and RF circuit points. Transistor Q105 provides “reverse battery protection” to the circuit. Q106 drives LED D101 (“Power On”), and Q107 drives LED D102 (“Low Battery”). RF Section Audio Input: Processed audio enters R217, an internal potentiometer that is adjusted for 15 kHz deviation (100% modulation) when the audio section provides a –2.2 dBV, 1 kHz tone. Oscillation: The audio then goes to varactor diode D201, which is part of the modulated oscillator-tripler stage (Q201). The latter’s baseemitter circuit operates as a crystal-controlled Colpitts oscillator in the 20 MHz region. Fundamental-mode crystal Y201 is tuned 10 kHz below series resonance by the series combination of frequency-netting coil Characteristics 2 25C1016 (CC) Shure T1 Body-Pack Transmitters L209, diode D201, capacitor C214, and capacitor divider C224 and C230. Frequency and Temperature Stability: To ensure frequency stability despite changes in the battery voltage, regulated 5 Vdc bias is applied to the varactor diode and to the base of Q201. Temperature compensation is provided by C224, C230, and C214. Tuned Circuits Stage 1: The collector circuit of Q201 is tuned to the third harmonic of the oscillator frequency (approximately 60 MHz) by L205, C225, C234, L202, C217, and C233. (The latter components also form a capacitivelytapped voltage divider for matching the signal to the base of Q203.) The output is double-tuned to provide high-spectral purity. Regulated dc bias is again employed to minimize changes in loading on the oscillator stage and to stabilize the drive levels. Stage 2: Q203 operates as a frequency tripler, with its collector circuit tuned to the output frequency (for example, 180 MHz). In this case, L204, C215, C237, C236, L207, C235, and C222 perform tuning and impedance-matching functions. As in the preceding stage, regulated dc bias is applied to the base circuit to stabilize the drive level, and the output is double-tuned to provide spectral purity. Stage 3: Q204 operates as a tuned amplifier. Resistive loading on the input provides stability. The output circuit consists of a resonant tank circuit (L203 and C213) capacitively coupled to a low-pass filter (C219, L206, and C218). C213 and C219 provide a capacitively tapped voltage divider for matching into the low-pass filter. Transmitter Output Transmitter: This can deliver up to +17 dBm (50 mW) to the antenna. No user adjustment permits this value to be exceeded. The unit should be powered exclusively by a 9 Vdc dry battery (an alkaline type, such as a Duracell MN1604, is recommended). Voltage Measurements: With 9 Vdc applied to the unit, the following voltages should appear at the terminals of the output transistor; S Vc = 8.88 Vdc S Vb = .450 Vdc S Ve = .473 Vdc. S Base current = .29 mAdc S Emitter current = 21.5 mAdc S Collector current = 21.8 mAdc S Power input = 183 mW The output power is +16.5 dBm (44.7 mW) into a 50 Ω load, at a frequency of 169.445 MHz. At the minimum acceptable battery voltage of 6 Vdc, the final collector current drops to 15 mAdc and the output power declines to +13.9 dBm (24.4 mW). 25C1016 (CC) 3 Characteristics Shure T1 Body-Pack Transmitters Antenna: This is a quarter-wavelength, permanently attached, flexible wire. The ground plane of the circuit serves as an untuned counterpoise capacitively coupled to the body of the user. Spurious Emissions: To minimize the production and radiation of spurious emissions and harmonic energy, and to promote stable operation, the collector of each RF stage is separately decoupled from the 9-volt supply by ferrite chokes, resistors, and bypass capacitors. The base circuits are similarly decoupled except that they use resistor-capacitor (R-C) networks, whose higher-impedance levels are more appropriate. Characteristics 4 25C1016 (CC) Shure T1 Body-Pack Transmitters Preliminary Tests Listening Tests Before disassembling the unit, operate it to determine whether it is functioning normally. Focused Testing: First and most important: Review any customer complaint or request and focus your listening and functional tests on any reported problem. For example, for “short range” and “drop-outs” complaints, perform only the RF tests in this section. If the unit passes these, there is a strong indication that the customer is using the product incorrectly (e.g., not keeping the transmitter in the receiver’s line of sight, not avoiding metal enclosures or TV interference). Return the unit to the customer together with an explanation of the proper set-up procedures. For complaints of distortion or other audio problems, try a “standard” lavalier or headset microphone (you should have one of each microphone on-hand for testing) and perform the audio tests in this section. Functional Tests RF Tests 1. Remove the case top, mute the audio, and apply 9 Vdc to the battery terminals. 2. Measure the current drain: it should not exceed 35 mA. 3. Maximize the signal received on the spectrum analyzer by attaching a telescoping whip antenna to it. Then measure the near-field output power: it should be 7 dBm. (If you are unsure of the results you obtain here, measure the output power conductively by soldering a 50 Ω cable to the output of the transmitter. Verify that the output power is 15 dBm, 2 dBm.) 4. Verify that the carrier frequency of the transmitter varies from its nominal value by no more than "6 kHz. 5. Check for an intermittent problem by shaking the transmitter and tapping on it. As you do so, try to keep it at a constant distance from the spectrum analyzer. Verify that the output power on the spectrum analyzer shows no large and sudden drops in power level (it will, however, vary a few dB with hand position). 6. Turn off the transmitter. If the transmitter passes the above tests, its RF circuits are working as designed. Audio Tests A: Verify the Matching Receiver 1. Connect the signal generator to the receiver through a 50 Ω cable. Tack-solder the center conductor to the antenna input and ground the shield of the cable to pcb ground. 25C1016 (CC) 5 Preliminary Tests Shure T1 Body-Pack Transmitters 2. Set the RF generator as follows: Amplitude: –20 dBm Modulation: 1 kHz Deviation: 15 kHz Frequency: T1 operating frequency 3. Connect the audio from the unbalanced output to the audio analyzer with a 3.3 kΩ load. Turn the Volume control all the way up. 4. For the associated T3 or T4, verify the following: S audio level is 400 mVrms ("90 mV) S thd = <0.75% B: Check the Transmitter 1. Disconnect the signal generator from the receiver. Monitor the receiver’s unbalanced audio output with a 3.3 kΩ load and the audio analyzer. Check that the receiver’s Volume control is still at its maximum setting. 2. Unmute the transmitter and turn its gain to the minimum setting. Connect an input cable as follows: T1 and T1G: Use adapter cables to input the audio to the bodypack input. T1P: Disassemble the case, remove the microphone, and attach the adapter cable to the four-pin header of the audio input. 3. Inject a 775 mV, 1 kHz signal from the audio analyzer into the adapter cable and verify the following: S the amplitude from receiver’s unbalanced output equals 400 mVrms ("90 mV) S thd = <0.75% 4. Change the frequency of the audio generator to 100 Hz and disengage the 400 Hz high-pass filter from the audio analyzer. Verify that the audio level is –1 dB ("0.7 dB) relative to the level measured in step 3. 5. Change the frequency of the audio generator to 10 kHz and reengage the 400 Hz high-pass filter. Verify that the audio level, relative to that measured in step 3, is 0 dB, "1 dB. Units That Pass If the system components pass these tests and the microphone is good, then the system is functioning as expected and shouldn’t require tuning and alignment. Inform the customer that the product has retested within specifications. Preliminary Tests 6 25C1016 (CC) Shure T1 Body-Pack Transmitters Disassembly and Assembly To access the printed circuit (pc) board, disassemble the transmitter. CAUTION Observe precautions when handling this static-sensitive device. Disassembly 1. Slide open the battery-compartment cover and remove the battery. 2. With a #1 Phillips screwdriver, remove the four screws securing the back of the case, and set them aside. 3. Carefully separate the top and bottom halves of the case to expose and lift out the pc board. (If you have trouble separating the case, carefully slit the label covering the case separation inside the battery compartment.) Reassembly Reassemble the T1 Transmitter as follows: 1. Presenter T1P transmitter only: Plug the lavalier microphone connector into J104. 2. Place the pc board in the bottom half of the case. 3. Slide the battery-compartment cover into its slot. 4. Align the rubber grommets (antenna, lavalier) while positioning the top half of the case over the bottom half. 5. Make sure the two sections are properly seated before securing them with the four Phillips screws. 25C1016 (CC) 7 Disassembly and Assembly Shure T1 Body-Pack Transmitters Converting a T1P to a T1 Because direct replacements for the lavalier microphones used in the T1P are no longer available, the best way of replacing the microphones in these earlier units is to replace the lavalier header with a male Tini Q-G connector, which will allow the unit to accept a WL93 or other microphone that has a mating connector. Changing the connectors in effect converts the T1P into a T1 unit. Parts Needed Microphone with a female Tini Q-G connector (e.g., Shure WL93). Part order RPW262 for all the following items: S male Tini Q-G connector with a pcb assembly S spacer S nut Conversion Procedures 1. After separating the two halves of the case, remove the pc board and the microphone. Pull the female connector wired to the microphone from the pcb header, J104. 2. Remove the header by unsoldering its four pins from the bottom of the pcb (the side with fewer components). Make sure the four holes in the pcb are open. 3. Orient the pcb assembly with the top (major-component) side up, the switches and LEDs to the left, and the antenna to the right. 4. Pull off the pre-cut insulation from the ends of the connector assembly’s ribbon cable. From the top of the transmitter board, insert the cable wires into the four holes vacated by the header: the black coded lead goes into the hole nearest the right edge of the pcb (towards the pcb number). 5. Solder the wires to the bottom of the pcb and cut off the excessive leads. 6. After replacing the transmitter’s pcb in the bottom half of the case, insert the connector into the front slot. Place the spacer and start the nut on the part of the connector that protrudes from the case. 7. After completing the reassembly, tighten the nut on the Tini Q-G connector. Disassembly and Assembly 8 25C1016 (CC) Shure T1 Body-Pack Transmitters Service Procedures Reference Material The Shure Wireless Systems: T Series User’s Guide provides a description, information on operation and troubleshooting, and technical data. Special Equipment The Wireless Service Equipment manual covers the standard items needed for servicing the transmitters. If you do not have the modified SC4 receiver described there, you will need an appropriate receiver (usually T3 or T4) to verify that the transmitter is working properly. System Operating Frequencies Each transmitter circuit board is marked with a group letter (A, B, C, or T) that identifies the range of frequencies on which the transmitter can operate. Table 1 shows the Group Letter and its associated frequencies. Note that this chart applies only to the T1 series. Table 1 (90_8552F) Pc Board Groups Group Frequency Range A 169.000–183.975 MHz B 184.000–198.975 MHz C 199.000–215.975 MHz T “AC,” “V,” & “W” frequencies Used with pcb assembly 90_8552F (pcb marking 34A8459F) Table 2 provides information for identifying the system frequency. The Crystal Letter Code, when used with the appropriate Shure model number, identifies a specific operating frequency for both transmitters and receivers. Note that, although a Crystal Letter Code always designates a specific frequency, it may be used with different Group Letters on other products. Group T: Beginning in July 1995, “V” and “W” frequencies, formerly assigned to the “A” board, were reassigned to a newly designated “T” board (see the “Audio Alignment” subsection in “Service Procedures”). 25C1016 (CC) 9 Service Procedures Shure T1 Body-Pack Transmitters Table 2 T1 Series System Operating Frequencies Group Crystal Code Freq. (MHz) T V 169.445 T AC 170.245 T W 171.845 A CA 176.200 A CC 177.600 A CE 182.200 A CF 183.600 B CG 186.200 B CL 192.200 C CQ 202.200 C CV 208.200 Changing the Frequency The operating frequency of the T1 transmitter may be changed within a specific group by changing the crystal on the pc board. (For Group information, see the preceding section.) Check the transmitter for proper operation before attempting to change its operating frequency. After installing the new crystal, perform the alignment procedures. Then run an operational test to ensure the transmitter is functioning properly. Finally, update the label to show the new frequency and letter identification code. Note: To ensure proper operation, obtain the crystal from Shure and verify that it operates within the frequency range of the pc board. Since crystals are marked with their nominal oscillating frequency, not a letter code, you can use the following equation to determine the frequency at which a transmitter will operate with a given crystal: Carrier Frequency = (9 nominal crystal freq. in MHz) –.09 Alignment The RF and audio alignments are generally done together, as a single, continuous procedure. Before beginning, be sure to do the setup described in the following subsection, “Test Conditions.” Test Conditions The following test conditions apply unless otherwise specified (see Figure 2): Service Procedures S An external 9-volt supply is connected to the battery terminals (J101 and J102). S The Power On/Off switch is off. S The Mute switch is set to “Mute.” 10 25C1016 (CC) Shure T1 Body-Pack Transmitters Pins 1 2 3 4 S The Gain pot (R125) is preset to its midpoint. S The 400 Hz high-pass and the 30 kHz low-pass filters on the audio analyzer are activated. T1P (Connector J104) 3 4 1 L209 R217 T1G (1/4I T1 (Tini “Q-G,” J201—solder side) 2 Y201 C217 Spectrum Analyzer or Frequency Counter C215 phone jack, J103) O ÊÊ TP4 O TP3 J101 – Battery terminals J102 + R125 R130 LED (red) “Low Battery” (D102) M O u n t e Mute switch (S101) “Power On” LED (green) (D101) Power On/Off switch (S102) T1 (Tini “Q-G”) pins: 1: Ground 2: +5 V 3: Audio 4: 20 kΩ to ground (connected to pin 3 in the microphone) Figure 2. Pc Board: Key Parts Locations Test Cable Use a 50 Ω coaxial test cable to connect the pc board with various test equipment (see Figure 2). To construct the 50 Ω test cable, see the Wireless Service Equipment manual. 1. Unsolder the antenna lead from the pc board. 2. Attach the center conductor of the 50 Ω RG174 cable to the antenna solder pad, and the shield to ground. 3. Turn on the T1. 25C1016 (CC) 11 Service Procedures Shure T1 Body-Pack Transmitters TP2 TP1 TP5 TP3 TP9 (–) Limiter components (not in all units) TP6 TP8 (+) TP7 TP4 Test Points TP1 Audio In, J104, pin 3, Model T1-P. TP2 Audio In, J103, center conductor of 1/4-in. phone jack, Model T1-G. TP3 Audio TP4 Antenna Output TP5 Intermediate Output TP6 9 Vdc TP7 5 Vdc TP8 (+) Battery TP9 (–) Battery Figure 3. Pcb Side 1 Display Checks 1. Connect the 9 Vdc power supply: the green LED should glow. 2. Reduce the power supply voltage to 6 Vdc: the red LED should glow. 3. Return the power supply voltage to 9 Vdc. 4. Verify that 9 Vdc 〈±0.35 Vdc) is present at TP6. 5. Verify that 5 Vdc 〈±0.25 Vdc) is present at TP7. RF Alignment A: RF Power and Frequency 1. Connect the 50 Ω output cable to the spectrum analyzer. Make sure S101 is in the “Mute” position. 2. Set the spectrum analyzer as follows: S Center Frequency: transmitter’s S Span: 1 MHz S Reference Level: +20 dBm S Scale: 10 dB/div 3. The output power should measure 15 dBm ( ±2 dBm) taking into account cable losses. If the power is within specification, skip to step 6. 4. Adjust C217 for maximum (peak) output power on the spectrum analyzer. Note: Once the signal is close to its maximum, setting the spectrum analyzer scale (under the amplitude menu) to 2 dB/div may make fine adjustments easier. 5. Adjust C215 for maximum output power on the spectrum analyzer. The output power should measure 15 dBm (±2 dBm) taking into account cable losses. Service Procedures 12 25C1016 (CC) Shure T1 Body-Pack Transmitters 6. Connect the 50 Ω output cable to the frequency counter. If the frequency is off by more than 5 kHz, adjust L209 to set the carrier frequency to FC ±1 kHz. 7. Reconnect the 50 Ω output cable to the spectrum analyzer. Confirm that the output power remains within specification. If necessary, readjust C217 and C215. B: Spurious Emissions 1. Set the scale on the spectrum analyzer back to 10 dB/div. 2. Check the level of spurious emissions up to 1 GHz. Set the start frequency of the spectrum analyzer to 10 MHz and the stop frequency to 1 GHz. All spurs must be at least 35 dB below the carrier level. If necessary, adjust C217 and C215 until the power and spurious response are both within specification. C: Current Drain 1. Using a milliammeter, make sure that the transmitter’s current drain is less than 35 mA. If it is too high, try detuning C215, taking care that the power and spurious response remain within specification. 2. Disconnect the power supply from the T1. 3. Unsolder the 50 Ω RG174/U test cable, and resolder the antenna lead to the RF board. Audio Alignment This section continues the procedures of the preceding subsections. D: Gain 1. Reconnect the power supply to the T1, and set its Mute switch to “On.” Set the audio analyzer output as follows: Frequency: 1 kHz Amplitude: 70 mV 2. Connect the audio analyzer’s output to the transmitter’s microphone input. Select the cable with the proper termination: (a) T1: Tini Q-G (quick-ground) connector (b) T1G: 1/4-in. phone plug (c) T1P: cable’s unterminated center conductor to pin 3 of J104; shield to ground 3. Adjust the Gain pot (R125) for 775 mVac, ±10 mVac (0 dB, ±0.1 dBu) at TP3 (turning counterclockwise increases the gain). Record the voltage at this setting. Note: At this point you may want to press the audio analyzer’s Log/Lin button (to measure logarithmically) and activate the Ra- 25C1016 (CC) 13 Service Procedures Shure T1 Body-Pack Transmitters tio button to perform the relative measurement in the next subsection. T1G (1/4I Pins 1 2 3 4 T1P (connector J104) 3 4 1 T1 (Tini “Q-G,” J201—solder side) 2 R217 L209 phone jack, J103) Y201 C217 C215 O TP4 O TP3 J101 – Battery Terminals J102 + R125 R130 M O u n t e “Power On” LED (green) (D101) LED (red) “Low Battery” Mute (D102) Switch (S101) out Power On/Off Switch (S102) Audio Analyzer in Receiver Figure 4. Audio Test Configuration for T1 E: Audio Frequency Response 1. Change the frequency of the audio analyzer to 100 Hz. 2. Deactivate the audio analyzer’s 400 Hz high pass filter. 3. Check that the audio level is equal to –1 dB (0.5 dB) relative to the level measured at TP3 in step 3 of subsection D (“Gain”). 4. Activate the 400 Hz high pass filter on the audio analyzer. 5. Change the frequency of the audio analyzer to 10 kHz. Because the limiter circuitry was removed from most units made after June 1995, the audio level will vary with the unit you have: S All “V” And “W” frequency units: +3.1 dB (±0.5 dB) S All units made through 6/95: +3.1 dB (±0.5 dB) S All non-“V” and “W” units made after 6/95: +4.85 dB (±0.5 dB) Note: pc boards with the limiter components (see Figure 3) should have the lower (+3.1 dB) audio output level. 6. Disengage the ratio function. Service Procedures 14 25C1016 (CC) Shure T1 Body-Pack Transmitters F: Deviation Reference Voltage 1. Turn off the transmitter. 2. Set the RF signal generator as follows: (a) Enter the carrier frequency. (b) Select FM modulation and enter the following: Modulation Source: Int 1 kHz FM Deviation: ±15 kHz Amplitude: –38 dBm 3. Select a receiver for the T1, making sure it is set to the same frequency as the transmitter. Disconnect the receiver’s antenna (non-diversity) or antennas (diversity). 4. Solder the 50 Ω cable to the receiver’s antenna pads: T3: Center conductor to TP1, and shield to TP2 T4: Center conductor to TPA1, and shield to TPA2 5. Connect the BNC end of this cable to the output of the RF signal generator. 6. Set the Volume control on the front panel of the receiver to its maximum position (fully clockwise). Then turn on the receiver and set its Squelch control to the midpoint position. 7. Measure the rms voltage developed across the unbalanced output of the receiver. You should find approximately 775 mVac. This is the audio output voltage that corresponds to a deviation level of 15 kHz. Record this voltage as the deviation reference voltage. Note: At this point you may want to press the audio analyzer’s Log/Lin button (to measure in dBm) and activate the Ratio button to perform the relative measurement in the next subsection. G: Deviation Adjustment 1. Turn off the RF switch on the RF signal generator. 2. Remove the test cable from the receiver and reconnect the antenna(s) to the receiver board. 3. Turn on the T1 and set its Mute switch to “On.” 4. Reconnect the output of the audio analyzer to the input of the T1. 5. Reset the frequency of the audio analyzer to 1 kHz. Make sure that 775 mV is still present at TP3. 6. Measure the voltage at the unbalanced output of the receiver. Adjust R217 for 0 dB (±1 dB) relative to the deviation reference voltage measured in step 7 of the preceding subsection. 25C1016 (CC) 15 Service Procedures Shure T1 Body-Pack Transmitters 7. Set the audio analyzer to measure distortion. Verify that the audio distortion at the unbalanced output of the matching receiver is less than 0.5%. If necessary, adjust R130 to obtain minimum distortion. Note: For T1G transmitters Only: After completing the alignment, turn the audio Gain potentiometer (R125) all the way down (fully clockwise as viewed from the top side of the circuit board). Service Procedures 16 25C1016 (CC) Shure T1 Body-Pack Transmitters Bench Checks Dc Power n Verify that 9 Vdc (±0.35 Vdc) is present at TP6. If this voltage is low, trace the circuitry back to the power supply to see where the loss occurs. Check: S power switch S bias on Q105 S L101 S circuit-board ground for 0 V n If you have a short to ground from 9 V, try isolating different parts of the circuit. Narrow it down to the RF or audio section. Look for foil shorts, solder bridges, and capacitors that have been installed backwards. n Check for 5 Vdc (±0.25 Vdc) at TP7 (pin 7 of U101). If the correct voltage is not present, check: S pin 13 of U101 for 9 V S values of R133, R135, and R137 Audio All the steps in this section comprise a methodical way of determining where the audio signal is being interrupted: n Check for audio at pin 7 of U102. If it is not present, check that the dc bias at pins 5, 6, and 7 of U102 is `4.5 Vdc (half the level of the supply voltage). If the correct voltage is not present: S Trace the circuitry: this bias derives from the 9 V line through voltage divider R103 and R105, then through R106 to pin 5. S Look for foil shorts, incorrect parts, and bad connections. n If there is audio at pin 7 of U102 but not at pin 14, check the dc bias at pins 12 and 13 (`1.8 Vdc) and pin 1 (`3.7 Vdc). If the correct voltage is not present: S Trace the circuitry: this dc bias proceeds from pin 9 of U101 through R107 to pin 12 of U102. S Check (a) the parts in the feedback path from pin 14 to pin 13, (b) the parts connected to pin 7, and (c) the connections from U102 to U101. n Check the connections from pin 14 of U102 to the next stage, to the limiter (Q103), and to pin 15 of U101. 25C1016 (CC) 17 Bench Checks Shure T1 Body-Pack Transmitters n Check the bias voltage (`4 Vdc) on pins 8, 9, and 10 of U102. If the correct voltage is not present: S Make sure the Mute switch is set to “On.” S Trace the bias circuit from the 5 V line through R104 to pin 10 of U102. S Check the values in the feedback path from pin 8 to pin 9 of U102, and the path to Q104 and pin 16 of U101. Frequency Problem n Make sure the RF carrier is at least 10 dB higher than the spurious emissions, to allow the frequency counter to lock on. n Check L209 for the proper group and make sure its core is not cracked. n Make sure the crystal (Y201) has the correct frequency. n Check the dc bias for Q201 against the readings of a unit known to be operating correctly. n Make sure that D201 is the correct varactor and has 5 Vdc on its cathode. n Check the parts and values of the oscillator circuit (from TP3 to TP5). n Look for shorts and opens. Low Output Power n Check the carrier output power after the oscillator stage (TP5). If there is no signal, refer to the preceding subsection, “Frequency Problem.” The remaining steps perform basically similar diagnostics for each of the three RF stages: n Stage 1: Make sure that rotating C217 360 degrees in either direction produces two separate peaks in the carrier output amplitude. If there is only one peak, check the color (value) of C217 and the values of L205, C225, C234, L202, and C233. Check the bias on Q201. Lastly, replace Q201. n Stage 2: Make sure that rotating C215 360 degrees in either direction produces two separate peaks in the carrier output amplitude. If there is only one peak, check the color (value) of C215 and the values of L204, C237, C236, L207, C235, C222, and C226. Check the bias on Q203. Lastly, replace Q203. n Stage 3: Check the dc bias on Q204 and the values of all the parts from the base of Q204 to TP4. Lastly, replace Q204. n If the power is slightly low and the spurious levels are high, check for wrong or open coils at L202, L207, and L206. Bench Checks 18 25C1016 (CC) Shure T1 Body-Pack Transmitters Excessive Current Drain n Try readjusting C215 for lower current drain while maintaining output power to specification. If the current drain is still excessive, check for the following: S short S wrong resistor value S shorted capacitor n As a last resort, try changing Q204. Deviation n If R217 cannot be adjusted to obtain a "15 kHz deviation, try to isolate the problem to the audio or RF section by doing the following: S If TP3 does not measure –2.2 dBV (775 mV), refer to the “Audio” subsection, above. S If TP3 has the right level, check R217, C220, C227, R208, R216, D201, R209, L209, and C214. Also make sure that the cathode of D201 is being supplied with a 5 Vdc bias from the 5 V Line through R216 and R208. The value of C214 is critical to the deviation sensitivity. n As a last resort, try replacing D201 and Y201. n Make sure the carrier is good: you need that to get any deviation. Distortion n Make sure the analyzer’s 400 Hz high-pass and 30 kHz lowpass filters are ”In.” n Pin 9 of U101 should read about 1.8 Vdc. n As you turn R130, the dc level on its wiper should change from about 1.5 V to 3.5 V. If it does not, check R129, C125, R130, R141, R140, R126, and the parts tied to pin 9 of U101. n Check the audio level. n Lastly, replace D201 and Y201. 25C1016 (CC) 19 Bench Checks Shure T1 Body-Pack Transmitters Notes: Notes: 20 25C1016 (CC) Shure T1 Body-Pack Transmitters Replacement Parts and Drawings On the next page, the parts are listed according to the designations from the pc board and schematic (see Figures 5 and 6, and the schematic). Parts shown on the circuit diagram and not listed below are available through electronic-parts distributors. On the pages following the parts list are the drawings of the printed circuit boards and the schematics. Product Changes This section briefly describes significant changes to the T1. Limiter Circuitry and “V” and “W” Frequencies: The limiter circuitry was removed from Group A, B, and C boards (see Figure 3 and the schematic). The older “A” board with the limiter circuitry (now designated as the “T” board) handles just the “V” and “W” “traveler” frequencies. T1 and T1P: The Model T1P (with a permanently attached lavalier microphone) was replaced by the model T1 (with a Tini Q-G connector instead of an attached microphone). Belt Clip: The older metal-plate clip was replaced by a wire-andplastic, spring-loaded clip. A new case bottom accommodates the new clip. Quad Op Amp: The older part (manufactured by Raytheon) was replaced; the former value of associated resistor R107 was 100 kΩ. “F” Assembly: This update added Group T, enlarged the hole for the antenna bracket, and changed the following parts from the earlier numbers or values given in parentheses: Q106 and Q107 (183A02)), R228 (0 Ω), S101 (55A8020), and S102 (55B8020). Parts Designations The following comments apply to the parts lists and the schematic: Resistors: All resistors are surface-mount with 1/10 W rating and 1% tolerance. Capacitors: Unless otherwise noted, non-polarized capacitors are surface-mount NPO dielectric types with a 100 V capacity and a 5% tolerance, and polarized capacitors are tantalum types. Temperature-Compensating Capacitors (N750): C214, C224, C230. Coils: These parts are rated in microhenries. 25C1016 (CC) 21 Replacement Parts and Drawings Shure T1 Body-Pack Transmitters Table 1 T1 Replacement Parts Drawing Designation Description Source: Shure Part No. (Commercial Alternate) A1 Printed circuit board assembly T1G: (Order the antenna, and 1/4-in phone jack separately) Printed circuit board assembly T1P: (Discontinued, for modification see pg. 8) Shure T90__8552 [See Table 2, to determine the Frequency Code in the underlined space. e.g. T90CF8552]. Printed circuit board assembly T1: (Order the antenna, and pcb with Tini “Q-G” connector seperately) A2 Wireless miniature omnidirectional lavalier microphone Shure 98A195 (no longer available) To adapt a T1P transmitter to work with other microphones, see “Converting a T1P to a T1) on page 8. C215 Capacitor, variable 3–10 pF Shure 152C02 D101 Light-emitting diode, green (power) Shure 86A8959 D102 Light-emitting diode, red (low battery) Shure 86B8959 D103 Dual diode Shure 184A08 (MMBD7000L) E1 Antenna Shure 70C8007 J101, J102 Battery terminals J103 Phone jack, 1/ 4-in Shure 56A8043 (mounted on T1G) Shure 95A8535 J104 Side entry shrouded header (mounted on T1P) Shure 95C8545 (no longer available)see “Converting a T1P to a T1) on page 8. J201 Mic Pcb and microphone receptacle ass’y Shure 95A8823 MP1 Battery door Shure 65A8352 MP2 Compression pad, battery Shure 38A185 MP3 Case (top, T1/T1G) Shure 65B8203 MP4 Case (bottom, T1/T1G) Shure 90A8706 MP5 Belt clip Shure 90A4392 MP6 Phillips pan-head hi-lo screw #4 x 5/8I Shure 30E1245 MP7 Nut for QG mic connector Shure 31A8140A MP8 Spacer Shure 31A8039A MP9 Case (top, TC1) Shure 65B8203B MP10 Case (bottom, TC1) Shure 65A8270B MP11 Contains: MP1, MP2, MP5, MP6, MP7, MP8 RPW616 MP12 Mic connector / PCB assembly RPW262 MP13 Battery polarity label 39A8092 Q103, Q104 PNP transistor (Group T only) Replacement Parts and Drawings Shure 183A01 22 25C1016 (CC) Shure T1 Body-Pack Transmitters Drawing Designation Description Source: Shure Part No. (Commercial Alternate) Q105 PNP transistor Shure 183A07 (MMBT404AL) Q106, Q107 NPN transistor Shure 183A38 (MMBT5089LT1) Q201, Q203, NPN transistor Q204 Shure 183A03 (MMBTH10) R125 Potentiometer, trim, 100 kΩ Shure 46D8049 R130 Potentiometer, trim, 20 kΩ Shure 146F02 R217 Potentiometer, trim, 10 kΩ Shure 146E02 S101 Switch, Mute Shure 55C8020 S102 Switch, Power Shure 55C8055 U101 Integrated circuit, compandor Shure 188A01 (Signetics NE571D) U102 Quad op amp Shure 188A49 (MC33179DR2) Y201 Crystal Shure 40_8006A (SeeTable 2, p. 10 in “Service Procedures” to determine the letter in the blank space.) Table 2 Frequency-Dependent Parts A B C T Grp Freq. 169.000–183.975 184.000–198.975 199.000–215.975 169.000–173.975 Not used Not used Not used 4.7 µF, 16 V C118 Not used Not used Not used 4.7 µF, 16 V C119 8.5–40 pF 4.5–20 (0.1 ) pF 4.5–20 pF 8.5–40 (0.1) pF C217 27 pF 22 pF 18 pF 27 pF C222 15 pF 12 pF 8.2 pF 15 pF C225 100 pF 100 pF 82 pF 100 pF C233 4.7 pF 3.3 pF 2.2 pF 4.7 pF C237 22 pF 22 pF 18 pF 22 pF C238 3.9 pF 2.7 pF 2.2 pF 3.9 pF C239 162D06 162D06 162E06 162D06 L203 82A8015 82B8015 82C8015 82A8015 L209 Not used Not used Not used 1 kΩ, 1% R122 Not used Not used Not used 1 kΩ, 1% R123 Not used Not used Not used 1.5 kΩ, 1% R127 Not used Not used Not used 1.5 kΩ, 1% R128 Not used Not used Not used 183A01 Q103 Not used Not used Not used 183A01 Q104 Note: See Tables 1 and 2 for information on the crystal. 25C1016 (CC) 23 Replacement Parts and Drawings Shure T1 Body-Pack Transmitters 34AB8459F Figure 5. Pcb Side 1 Figure 6. Pcb Side 2 Replacement Parts and Drawings 24 25C1016 (CC) Shure T1 Body-Pack Transmitters TP 5 TP 2 TP 1 TP 4 TP 3 TP 9 (–) TP 6 TP 7 TP 8 (+) TP – Test Points TP 1 Audio In, J104, pin 3, Model T1–P. TP 2 Audio In, J103, center conductor of 1/4 in. phone jack, Model T1–G. TP 3 Audio TP 4 Antenna Output TP 5 Carrier Output TP 6 9.0 Vdc TP 7 5.0 Vdc TP 8 (+) Battery TP 9 (–) Battery Figure 7. Earlier Version of T1 Pc Board (Side 1) Figure 8. Earlier Version of T1 Pc Board (Side 2) 25C1016 (CC) 25 Replacement Parts and Drawings Shure T1 Body-Pack Transmitters [Insert: Earlier Version of T1 schematic (81/2 11) as p. 26; Current T1 schematic (11 17) attached] Do not print this page! Replacement Parts and Drawings 26 25C1016 (CC) +5V R106 TP2 N13 .022uF C133 150pF C134 150pF D103 L102 C105 5 3 1 2 2 CW R119 1K 3 C120 4.7 X 16V N19 N82 C110 + R145 GAIN R112 1.0 X16V C106 1.0 X 16V N20 R115 16.5K C111 1 R125 2.0K 100K ANTI–LOG TAPER 1 + N17 6 N23 FOR AUDIO INPUT: T1G WILL HAVE J103 PRESENT ON THE FINAL PRODUCT. T1P WILL HAVE J104 PRESENT ON THE FINAL PRODUCT. 100K 7 U102 C 188A120 C137 4 14 150pF U102A 188A120 R117 24.9K + 188A01 2 3 U101 2 L101 162A03 N35 C126 + 4.7 X 16V 16 C121 J102 GREEN R136 D101 6.19K J101 N43 3.01K RED R134 3.01K D102 0 R126 R123 Q103 183A01 N30 75K R127 R128 1.5K 1.5K N27 1K N28 183A01 Q104 N33 N34 60.4K 10K + N42 +5V 2 CW C125 1.0 X 16V 1 N80 R141 10K 7 Q106 183A02 100 188A01 U101 +5VA +5V TO RF N79 L104 RV5 C128 150pF B 2 4 R139 1K TP7 3 G 13 C129 150pF Q107 183A02 R137 13.3K 49.9K R130 +9V N46 R133 5 3 20K +5V N36 6 N39 R135 TP9 1 +9VR 8 AUDIO GROUND GNDA +9V C119 4.7 X 16V + +5V N44 N45 R138 681 N75 C124 150pF R132 N41 + +9V N32 R122 1K N29 R140 R129 N38 R131 4.02K TP8 R118 10K + N24 C117 + 1.0 X 16V N25 9 C123+ 1.0 X16V C127 .001 C115 .0015 C118 4.7 X 16V A +9V Q105 183A07 N37 N14 N21 * R124 AUDIO 1 4.7 X16V C112 14 15 S102 55B8055 R111 249 C107 + 330pF C109 + 4.7 X 16V 11 – 12 .0039 +9V TO RF N10 N12 9 7.5K N18 G N31 10K 8 U102 B 188A120 11 10 +9VA AUDIO TO RF 10 402K R114 R113 C108 N16 N15 4.7 X 16V 13 N22 2.0K 2 N26 1 + TP6 N7 R109 PIN 9 OF U101 MC33179DR2 R107 N11 12 1M C104 1 + 1.0 X 2 16V C102 + 4.99K 47 X 10V +9V 6 1M *AUDIO IN N4 C101 + 47 X 10V 5 R105 + R104 100K R102 N3 10K S101 55A8020 R101 4 C103 1.0 X16V N81 .0039 J103 2 N9 4 R110 N8 C132 7 1 3 470pF 499 N5 R103 1M N76 3 R144 20K N6 C136 2 TP1 +9V C131 150pF 1 J104 1 2 3 4 +5V N1 + C130 4.7 X 16V 499 184A08 R142 2.0K R143 N2 RV9 C201 560pF C202 .01 C203 560pF +5V C205 .01 R202 100 C240 560pF R203 100 162A03 R204 30.1K C207 C206 N49 R208 10K R205 6.81K N50 C212 C237* 4.7pF L205 .470 .001 C225* 15pF AUDIO N60 TP3 N14 N750 C214 C220 R216 R217 3 N69 N68 N65 10K 2 49.9K 27pF LIN CW 4.7 X 16V 1 D201 C227 184A22 .001 NOTE 5 N70 Q201 C224 47pF N750 R223 7.5K TP5 22pF C217* N58 1pF N66 Y201 R227 49.9K C234 L204 .056 Q203 183A03 N63 N57 C215 3–10pF C233* 100pF C236 N52 0.5pF L207 .056 8–40pF L202 .220 C208 560pF L203* .180 C239* TP4 C213 C238* N71 R222 7.5K C235 183A03 Q204 N53 N51 N59 3.3pF C222* 27pF 3.9pF L206 .068 C219 4.7pF 15pF E201 R228 0 N54 C218 10pF N67 R218 2.21K R219 33 C226 560pF R220 200 +5VR N48 560pF R206 20K C204 560pF L201 560pF C223 560pF GNDR N73 L209 C230 68pF N750 * R226 402 FREQUENCY DEPENDENT PARTS BY GROUP AND COMPONENT NO. VARIABLE COMPONENTS GROUP A FREQUENCY RANGE C237 PART NO. 169.000 – 184.000 MHz 150DA478CA pF C225 PART NO. 4.7 150DA150JA pF C233 PART NO. pF 15 150DA101KA 100 C238 PART NO. 150DA220JA pF C239 PART NO. 22 150DA398CA pF L209 PART NO. L203 PART NO. µH 3.9 82A8015 162D06 .180 GROUP B 184.000 – 199.000 MHz 150DA338CA 3.3 150DA120JA 12 150DA101KA 100 150DA220JA 22 150DA278CA 2.7 82B8015 162D06 .180 GROUP C 199.000 – 216.000 MHz 150DA228CA 2.2 150DA828CA 8.2 150DA820JA 82 150DA180KA 18 150DA228CA 2.2 82C8015 162E06 .150 C222 PART NO. pF C217 PART NO. 150DA270JA 27 152F01 150DA220JA 22 152D01 150DA180KA 18 152D01 E 1999, Shure Brothers Inc. 27B1016 (SB) NOT USED: L208, L102, L103 Q101, Q102, Q202 N5 T1 Earlier Version +5V *Audio In J104 R103 1M C136 4 .0039 N9 N8 C132 7 3 N5 N76 10K R110 C105 N4 499 470pF N13 1.0 X 16V C133 150pF C134 150pF L102 TP2 Pin 9 of U101 R107 5 3 .022uF 1 U102C 188A49 6 2 1 R119 1K 2 C12 4.7 0 pF 16V 24.9K 7 2 CW 3 R125 1 100K Anti-log Taper R145 N82 C110 + 2.0K R112 N19 N20 16.5K 1 pF 16 V 4.99K C102 47 pF 10V +9V MC33179DR2 12 N22 12 4 14 11 2 N25 TP6 N37 L101 162A03 N35 Green R136 6.19K J101 D101 C126 4.7 X 16V R132 N41 +9V + C127 .001 R134 3.01K Q106 R138 681 CW N38 + 1 330pF R123* R127* R128* 1.5K 1.5K +9V RF N27 1K Q104* 183A01 N80 3 R141 N39 R135 10K 6 5 7 49.9K 188A01 +9V U101 C129 150pF 183A02 +5V to RF 13.3K R137 TP7 3 G 13 Q107 +5V R133 N79 100 +5V Aud. L104 C128 150pF B 2 4 R139 1K 1 Gnd Aud C119* 4.7 pF 16 V + TP9 +9V S10 55A8020 1 10K N44 183A02 5 N28 D102 N46 6 4 N36 2 20K R130 C125 1 pF 16V +5V 3 N34 60.4K 10K 4.7 pF 16 V 1 1K 183A01 N14 2 +5V N30 C107 + C112 R118 R122* Q103* N10 249 9 C115 .0015 + 8 R111 N12 N33 R126 C124 150pF Red N43 N45 7.5K N24 R140 75K R124 0 N75 + C123 1 pF 16V N42 3.01K 10K N29 N32 9 16 R129 R131 4.02K TP8 * Audio 183A07 R114 U102B 188A49 N18 C117 1 pF 16V C121 +9V Q105 1 R113 C118* 4.7 pF 16V + U101A 2 J102 + C109 4.7 pF 16V 14 G 15 3 S102 55B8055 N16 188A01 N26 Audio to RF 10 N21 + 10 + +1 N31 C108 N15 4.7 pF 16 V - R117 24.9K .0039 +9 V to RF N7 402K C137 150pF 11 13 + 2 R109 U102A 188A49 C106 1 pF 16V 1 C104 1 pF 16V R115 2.0K C111 + C101 47 pF 10V N11 + N17 Gain N23 For Audio Input: T1G will have J103 present on the final product. T1P will have J104 present on on the final product. T1 will have J201 present on the final product. The wires from the mic jack board to the main board (W1-W4) are in the form of a fourĆconductor ribbon cable. + R104 100K R102 N3 + C103 R106 1M 184A08 N81 R101 R105 1M N6 J103 +5V +9V C131 150pF C130 4.7 pF 16V R144 20K TP1 1 N1 + 499 1 2 3 4 W3 R142 2.0K D10 3 J201 4 3 W2 1 2 W4 R143 N2 W1 8 Audio Ground RV9 C201 560pF Components C118, C119, R122, R123, R127, R128, Q103 and Q104 are only placed on Part 90 approved frequencies beginning 7/1/95. Before that date, these components were place on all units. C202 .01 C203 560pF +5V * FrequencyĆdependent parts: see the tables in the manual. C205 .01 R206 20K R208 10K C212 .001 C234 N68 2 CW C220 4.7 pF 16V N65 R216 49.9K N69 Y201* N66 27pF D201 184A22 C227 .001 N70 R227 49.9K 183A03 3 1 C225* 15pF C224 47pF R223 7.5K 1pF Q201 N73 C230 68pF N750 R226 402 22pF C217* N57 TP5 N63 C233* 100pF 183A03 C236 N52 L207 .056 N71 R220 200 C208 560pF L203* .180 C239* TP4 3.9pF C235 183A03 N59 C222* 27pF N51 N67 R218 2.21K C213 N53 3.3pF Q204 15pF 0.5pF Q203 R222 7.5K +5V RF C204 560pF L201 C215 3-10pF 8-40pF L202 .220 N750 L209 * N58 C238* RV5 N48 L204 .056 C237* 4.7pF L205 .470 N14 R217 10K LIN N49 C207 560pF R205 6.81K N60 N750 C214 R204 30.1K C206 560pF N50 Audio TP3 R202 100 C240 560pF R203 100 162A03 R219 33 C219 4.7pF C223 560pF L206 R228 .068 0 E201 N54 C218 10pF Gnd RF C226 560pF T1 PC Board (from 90-8552E-11) +5V *Audio In J104 R103 1M C136 4 .0039 N8 C132 7 3 N5 N76 10K R110 C105 N4 499 470pF N13 1.0 X 16V C133 150pF C134 150pF L102 TP2 162T06 Pin 9 of U101 R107 5 3 .022uF 1 U102C 188A49 6 2 1 R119 1K 2 C12 4.7 0 pF 16V 24.9K 7 2 CW 3 R125 1 100K Anti-log Taper R145 N82 C110 + 2.0K R112 N19 N20 16.5K 4.99K C102 47 pF 10V +9V MC33179DR2 12 4 14 12 11 2 14 N25 + U101A TP6 Q105 N37 L101 162A03 N35 Green R136 6.19K J101 D101 C126 4.7 X 16V R132 N41 +9V R134 3.01K Q106 R138 681 7.5K CW N38 + 1 C125 1 pF 16V +5V 6 2 5 1 S10 55C8020 1 4 R123* N28 R127* R128* 1.5K 1.5K N27 1K Q104* 183A01 N36 2 20K R130 N80 3 R141 N39 R135 10K 6 5 7 49.9K 188A01 +9V N44 U101 C129 150pF 183A38 +5V to RF 13.3K R137 TP7 3 G 13 Q107 +5V R133 N79 100 +5V Aud. L104 C128 150pF B 2 4 R139 1K 1 +9V RF +9V 3 N34 60.4K 10K 183A01 4.7 pF 16 V C119* 4.7 pF 16 V + +5V N30 N14 10K 1K Q103* C107 + C112 TP9 Gnd Aud N10 249 R118 R122* D102 183A38 R111 N12 N33 R126 C124 150pF Red N46 8 9 C115 .0015 + N24 R140 75K R124 0 N75 + C123 1 pF 16V N42 3.01K 10K N29 N32 9 16 C127 .001 N43 N45 * R129 R131 4.02K TP8 + R114 N18 C117 1 pF 16V C121 +9V Audio 183A07 R113 C118* 4.7 pF 16V 188A01 G 2 J102 + C109 4.7 pF 16V 10 + R117 24.9K N26 1 N16 U102B 188A49 N21 + 15 3 S102 55C8055 C108 N15 4.7 pF 16 V - +1 N31 Audio to RF 10 330pF N22 .0039 +9 V to RF N7 402K C137 150pF 11 13 + 2 R109 U102A 188A49 C106 1 pF 16V 1 C104 1 pF 16V R115 2.0K C111 1 pF 16 V + C101 47 pF 10V N11 + N17 Gain N23 For Audio Input: T1G will have J103 present on the final product. T1P will have J104 present on on the final product. T1 will have J201 present on the final product. The wires from the mic jack board to the main board (W1-W4) are in the form of a fourĆconductor ribbon cable. + R104 100K R102 N3 + C103 R106 1M N9 184A08 N81 R101 R105 1M N6 J103 +5V +9V C131 150pF C130 4.7 pF 16V R144 20K TP1 1 N1 + 499 1 2 3 4 W3 R142 2.0K D10 3 J201 4 3 W2 1 2 W4 R143 N2 W1 8 Audio Ground RV9 C201 560pF Components C118, C119, R122, R123, R127, R128, Q103 and Q104 are only placed on Part 90 approved frequencies beginning 7/1/95. Before that date, these components were place on all units. C202 .01 C203 560pF +5V * FrequencyĆdependent parts: see the tables in the manual. C205 .01 R206 20K R208 10K C212 .001 C234 N68 2 CW C220 4.7 pF 16V N65 R216 49.9K N69 Y201* N66 27pF D201 184A22 C227 .001 N70 R227 49.9K 183A03 3 1 C225* 15pF C224 47pF R223 7.5K 1pF Q201 N73 C230 68pF N750 R226 402 22pF C217* N57 TP5 N63 C233* 100pF 183A03 C236 N52 L207 .056 N71 R220 200 C208 560pF L203* .180 C239* TP4 3.9pF C235 183A03 N59 C222* 27pF N51 N67 R218 2.21K C213 N53 3.3pF Q204 15pF 0.5pF Q203 R222 7.5K +5V RF C204 560pF L201 C215 3-10pF 8-40pF L202 .220 N750 L209 * N58 C238* RV5 N48 L204 .056 C237* 4.7pF L205 .470 N14 R217 10K LIN N49 C207 560pF R205 6.81K N60 N750 C214 R204 30.1K C206 560pF N50 Audio TP3 R202 100 C240 560pF R203 100 162A03 R219 33 C219 4.7pF C223 560pF L206 .068 E201 R228 22.1 N54 C218 10pF Gnd RF C226 560pF T1 “F” PC Board (from 90-8552F-11)