Download 37GQ20S-21S Service Manual (02 Version) - Wiki Karat

37GQ-20S
37GQ-21S
SERVICE MANUAL
SEJB37GQ2*S02
Issued: 9th June ‘00
SQUAD CHASSIS
PAL SYSTEM COLOUR TELEVISION
MODELS:
37GQ-20S
37GQ-21S
In the interests of user safety (required by safety
regulations in some countries) the set should restored
to its original condition and only parts identical to
those specified should be used.
CONTENTS
ELECTRICAL SPECIFICATION.......................2
IMPORTANT SERVICE NOTES.......................3
SERVICE ADJUSTEMENTS.............................4
PRINTED WIRING BOARDS...........................11
SCHEMATIC DIAGRAM, WAVE FORMS..... .13
PART LIST.......................................................18
TROUBLESHOOTING TABLES......................23
SHARP CORPORATION
1
This document has been published to
be used for after sales service only.
37GQ-20S
37GQ-21S
ELECTRICAL SPECIFICATIONS
•Sound Carrier Trap
B/G.......................................................33.4MHz
•Power Input .......................220V-240 Volts AC 50Hz
•Power Consumption
Normal Operating...................................30W
•Adjacent Sound Carrier Trap
B/G.............................................................40.4MHz
Stand-by Operating................................7.5W
(Method IEC60107)
•Audio Power Output Rating .....................2W (MPO)
•Adjacent Picture Carrier Trap
B/G.......................................................30.9MHz
Speaker............................32Ω 2W, 8cm Round, 1pc
Convergence.........................Self Converging System
•Aerial Input Impedance
VHF/UHF...........................75 ohm Unbalanced
Focus....................................Bi-Potencial Electrostatic
Sweep Deflection...........................................Magnetic
•Tuning Ranges
•Picture Intermediate Frecuencies
B/G...........................................................38.9MHz
B/G............................48.25MHz thru 855.25 MHz
CATV Special Channels
•White Level
Set brightness control to get total picture tube cathode current of 600 milliamperes under no signal condition.
Maximum necessary correction of each picture tube cathode current to get 8550 degree K-20 MPCD screen
temperature should not exceed 15% of its original value.
X=0.290
Y=0.300
Specifictions are subject to change without prior notice.
WARNING
The chassis in this receiver is partially live. Alwais use an isolation transformer when
servicing this chassis.
To prevent electric shock, do not remove cover. No user-serviceable parts inside. Refer
servicing to qualified service personnel.
MODEL DESTINATION & DIFFERENCES:
37GQ-20S DE: Autria
37GQ-20S DES: Germany (Silver)
37GQ-20S ES: Spain
37GQ-20S IT: Italy
37GQ-20S NL: Holland
37GQ-20S SE: Sweden
37GQ-21S ESY: Spain (Yellow, with headphones)
37GQ-21S ESR: Spain (Red, with headphones)
2
37GQ-20S
37GQ-21S
IMPORTANT SERVICE NOTES
Maintenance and repair of this receiver should be done by qualified service personnel only.
SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE
When servicing the high voltage system, remove static charge from it by connecting a 10K ohm resistor in
series with an insulated wire (such as test probe) between picture tube ground tag and high voltage lead.
(AC line cord should be disconnected from AC outlet).
1. The Picture tube in this receiver employs Integral Implosion protection.
2. Replace with tube of the same type number for continued safety.
3. Do not lift picture tube by the neck.
4. Handle the picture tube only when wearing shatterproof goggles and after discharging the high
voltage completely.
X-RAY
This receiver is designed so that any X-Ray radiation is kept to an absolute minimum. Since certain malfunctions
and servicing may produce potentially hazardous radiation with prolonged exposure at close range, the following
precautions should be observed:
1. When repairing the circuit, be sure not to increase the high voltage to more than 25.5 KV, (at beam
1000µΑ) for the set.
2. To keep the set in a normal operation, be sure to make it function on 22.4KV ±1.5KV (at beam
800µΑ) in the case of the set. The set has been factory - adjusted to the above mentioned high
voltage. Always check the high voltage if there is any possibility that it might have changed as a
result of the repair.
3. Do not substitute a picture tube with unauthorized types and/or brands which may cause excess
X-Ray radiation.
BEFORE RETURNING THE RECEIVER
In addition to the above checks, the following safety checks should also be carried out before returning the
unit to the user.
1. Inspect all leads and dress to make certain that the leads are not pinched or that hardware is not
lodged between the chassis and other metal parts.
2. Inspect all protective devices such as non-metallic control knobs, insulating fish papers, cabinet
backs, adjustment and compartment covers or shields, insolation resistor-capacity networks,
mechanical insulators etc.
3
37GQ-20S
37GQ-21S
SERVICE ADJUSTMENT
•SERVICE MODE FUNCTION
This mode funtion is provided to assist with the settings of those adjustments that may vary from one
Picture Tube to another, or between models.
In order to use the Service Mode
1. Press main switch to OFF.
2. Connect Test Pattern signal to antenna terminal.
3. Press ∨
, CH ∨ and main switch to ON simultaneosly or
press ∧
, CH ∧ and main switch to ON simultaneosly.
4. -SERVICE- will appear on screen. Service mode is now entered.
5. Select adjustment using buttons ∧ CH ∧.
To exit Service Mode, press main switch to OFF or press MENU button on R/C.
Displayed
on screen
a.
b.
c.
d.
e.
SERVICE
NVM
AGC GAIN
AGC STR
PLL
PAL
f.
AUTO
g.
h.
i.
j.
k.
l.
m.
n.
B-GAIN
G-GAIN
G-DC
R-GAIN
R-DC
HOR POS
VERT POS
VERT AM
Hexadecimal /
Decim. Range
00 ∼ 03H
00 ∼ 63H
S, L, VL, N
4-43, 3-58,
SECAM, NTSC
4-43,NTSC 3-58,
AUTO PNS,
AUTO PN
AUTO, 50HZ,
60HZ
0 ∼ 63d
0 ∼ 63d
0 ∼ 63d
0 ∼ 63d
0 ∼ 63d
0 ∼ 63d
0 ∼ 63d
0 ∼ 15d
Function
Indicates operative Service Mode.
Access to NVM memory
Auto Gain Control
Auto Gain Starting Point
Line PLL time constant
Colour system.
Field Frequency
Blue Gain
Green Gain
Green Cut
Red Gain
Red Cut
Horizontal Position shift
Vertical Position shift
Vertical Amplitude shift
6. For « a » Selection:
NVM storage location settings variants.
BANK
X
POS
XXH
VALUE
XXH
Assigned value
Storage location
Memory Bank
In order to have access to NVM «MENU» button should be pressed. To obtain a higher or lower Memory
Bank, buttons
buttons ∨ CH
∨
∧ should be pressed respectively. To have access to the desired Storage Location,
∧ should be pressed, as required to obtain a higher or lower location, respectively.
4
37GQ-20S
37GQ-21S
Bear in mind that, for storage location indication a hexadecimal numerical system is used, instead of a
decimal system.
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10, 11, ......19, 1A, 1B, 1C, 1D, 1E, 1F, 20, 21, ....., 99, 9A, 9B,
9C, 9D, 9E, 9F, A0, A1, ....., B0, ....., C0, ....., D0, .....E0, ....., F0, F1, F2, F3, F4, F5, F6, F7, F8, F9, FA,
FB, FC, FD, FE, FF.
From the last location FF to the first 00 can be reached by increasing and from first to last by decreasing.
Once the storage location to be varied has been selected, its value can be modified by the bits that form
part of the storage location numerical buttons, numbers «0» to «7», respectively. This swithches the binary
number from and between 0 and 1 each time one of the buttons is pressed.
«0»:20=1, «1»: 21=2, «2»: 22=4, ...
7. For «b,c» and «g» thru «n» selections:
Adjustment to a selection can be made by pressing buttons ∨
8. For «d» thru «f» selections:
Adjustment to a selection can be made by pressing button
∧.
∧.
NVM LIST DESCRIPTION
BANK
00H
ADDRESS
00H
3BH
3CH
3DH
3EH
3FH
DESCRIPTION
ZONE FOR TUNNING INFORMATION (BEGIN)
ZONE FOR TUNNING INFORMATION (END)
STAND BY: 44H -> ON
40H -> OFF
OPTION BYTE:
10XXXXXX -> HOTEL MODE 1 (START IN
PRG1. NO TUNNING OPTION.
VOLUME LIMITATION).
11XXXXXX -> HOTEL MODE 2 (START IN
PRG 1. NO TUNING OPTION.
VOLUME LIMITATION.
START IN SCART MODE.
OUT FROM STDBY WITH SSW.
XXDDDDDD -> VOLUME ATTENUATION:
0AH -> 100%, 00H -> 0%
DIODE_NVM:
XXXXXXX0 -> SYMBOLIC OSD.
XXXXXXX1 -> CHARACTER OSD
XXXXX1XX -> ENGLISH LANGUAGE.
DIODE2_NVM:
XXXXXXX1 -> FRENCH STANDARD
XXXXX01X -> BG STANDARD
XXXXX10X -> L/L’ STANDARD
XX1XXXXX -> AUDIO FOR UK
X1XXXXXX -> AUTOINSTALLATION ON
1XXXXXXX -> ONLY UHF BAND.
VALUE
CAH
10H
44H
00H
04H
00H
01H
00H
3BH
3DH
3EH
3FH
ZONE FOR TUNNING INFORMATION (BEGIN)
ZONE FOR TUNNING INFORMATION (END)
UHFLOW: LOW WINDOW LIMIT FOR UHF BAND
VHF3LOW: LOW WINDOW LIMIT FOR VHF3 BAND
VHF1LOW: LOW WINDOW LIMIT FOR VHF1 BAND
10H
10H
00H
00H
00H
02H
00H
3FH
RESERVED ZONE FOR PROGRAMME NAMES (BEGIN)
RESERVED ZONE FOR PROGRAMME NAMES (END)
24H
24H
5
37GQ-20S
37GQ-21S
03H
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
10H
11H
12H
13H
14H
15H
16H
17H
18H
19H
1AH
1BH
1CH
1DH
1EH
1FH
20H
21H
22H
23H
24H
25H
26H
27H
28H
29H
2AH
2BH
2CH
2DH
2EH
2FH
30H
31H
32H
33H
34H
ONE CHIP REGISTER 00:
ONE CHIP REGISTER 01:
ONE CHIP REGISTER 02:
ONE CHIP REGISTER 03:
ONE CHIP REGISTER 04:
ONE CHIP REGISTER 05:
ONE CHIP REGISTER 06:
ONE CHIP REGISTER 07:
ONE CHIP REGISTER 08:
ONE CHIP REGISTER 09:
ONE CHIP REGISTER 0A:
ONE CHIP REGISTER 0B:
ONE CHIP REGISTER 0C:
ONE CHIP REGISTER 0D:
ONE CHIP REGISTER 0E:
ONE CHIP REGISTER 0F:
ONE CHIP REGISTER 10:
ONE CHIP REGISTER 11:
ONE CHIP REGISTER 12:
ONE CHIP REGISTER 13:
ONE CHIP REGISTER 14:
ONE CHIP REGISTER 15:
ONE CHIP REGISTER 16:
ONE CHIP REGISTER 17:
ONE CHIP REGISTER 18:
ONE CHIP REGISTER 19:
ONE CHIP REGISTER 1A:
ONE CHIP REGISTER 1B:
ONE CHIP REGISTER 1C:
ONE CHIP REGISTER 1D:
ONE CHIP REGISTER 1E:
ONE CHIP REGISTER 1F:
VPOS_50 (VERTICAL POSITION) 4/3 50 Hz.
VAMP_50 (VERTICAL AMPLITUDE) 4/3 50 Hz
VPOS_60 (VERTICAL POSITION) 4/3 60 Hz
VAMP_60 (VERTICAL AMPLITUDE) 4/3 60 Hz
HSHIFT_60 (HORIZONTAL SHIFT) 60Hz
HSHIFT_50 (HORIZONTAL SHIFT) 50Hz
FINVFH: STEP FOR FINE TUNING IN VHF BAND
VHF1_STEP: THICK TUNING STEP FOR VHF1 BAND
VHF3_STEP: THICK TUNING STEP FOR VHF3 BAND
UHF_STEP: THICK TUNING STEP FOR UHF BAND
LP_COARSE: THICK TUNING ADJUSTMENT FOR L’
BG_COARSE: THICK TUNING ADJUSTMENT FOR L AND BG
BG_FINE: FINE TUNING ADJUSTMENT FOR L AND BG
LP_FINE: FINE TUNING ADJUSTMENT FOR L’
DELAY SEARCH:
XXXXXXX0 -> SHOWS ‘PROGRAMME –‘
DURING AUTOSEARCH.
XXXXXXX1 -> DHOWS ‘AUTO SEARCH’
DURING AUTOSEARCH
VHF1_SP: STEP FOR AUTO SEARCH IN VHF1 BAND
VHF3_SP: STEP FOR AUTO SEARCH IN VHF3 BAND
UHF_SP: STEP FOR AUTO SEARCH IN UHF BAND
OLD_PROGRAM: FOR FLASHBACK RETURN
UHFHIGH: UPPER WINDOW LIMIT FOR UHF
VHF3HIGH: UPPER WINDOW LIMIT FOR VHF3
6
80H
05H
9FH
20H
00H
CCH
44H
34H
21H
A1H
32H
B2H
32H
20H
20H
18H
15H
00H
00H
20H
20H
00H
1FH
20H
2BH
00H
90H
90H
90H
00H
00H
00H
12H
0FH
0FH
0FH
1DH
22H
00H
A4H
55H
55H
02H
0AH
00H
00H
00H
0AH
05H
03H
02H
01H
01H
37GQ-20S
37GQ-21S
35H
36H
37H
38H
3BH
3CH
3FH
04H
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
10H
11H
12H
13H
14H
15H
16H
17H
18H
19H
1AH
1BH
1CH
1DH
1EH
1FH
20H
21H
22H
23H
24H
25H
26H
27H
28H
29H
2AH
2BH
2CH
2DH
2EH
VH F1HIGH : U PPER WIND OW LIM IT FOR V HF1
01H
PRG _NUM B ER: CU RREN T PRO GRA M ME NU MBE R
03H
W AITSUP : U PPER L IM IT DE LAY TIME FOR A UTO SEAR CH.
0FH
W AITINF: LO WER LIMIT D ELA Y TIM E FOR A UTO SEA RCH
03H
SCA RT BL OKIN G:
00H
00H = NO SCART BLO CKING
Do not use.
01H = SCAR T BLO CKIN G W HE N AN Y PR . IS IN CHILD Just for
UK m odels
LO CK M OD E.
RET _COL: DE LAY IN COL OU R IDENT IFIC ATION IN AU TO
40H
M OD E.
CH ECK SUM
7EH
ON E CH IP R EGISTE R 00:
ON E CH IP R EGISTE R 01:
ON E CH IP R EGISTE R 02:
ON E CH IP R EGISTE R 03:
ON E CH IP R EGISTE R 04:
ON E CH IP R EGISTE R 05:
ON E CH IP R EGISTE R 06:
ON E CH IP R EGISTE R 07:
ON E CH IP R EGISTE R 08:
ON E CH IP R EGISTE R 09:
ON E CH IP R EGISTE R 0A:
ON E CH IP R EGISTE R 0B:
ON E CH IP R EGISTE R 0C:
ON E CH IP R EGISTE R 0D:
ON E CH IP R EGISTE R 0E:
ON E CH IP R EGISTE R 0F:
ON E CH IP R EGISTE R 10:
ON E CH IP R EGISTE R 11:
ON E CH IP R EGISTE R 12:
ON E CH IP R EGISTE R 13:
ON E CH IP R EGISTE R 14:
ON E CH IP R EGISTE R 15:
ON E CH IP R EGISTE R 16:
ON E CH IP R EGISTE R 17:
ON E CH IP R EGISTE R 18:
ON E CH IP R EGISTE R 19:
ON E CH IP R EGISTE R 1A:
ON E CH IP R EGISTE R 1B:
ON E CH IP R EGISTE R 1C:
ON E CH IP R EGISTE R 1D:
ON E CH IP R EGISTE R 1E:
ON E CH IP R EGISTE R 1F:
VPO S_50 (VER TIC AL PO SIT IO N) 4/3 50 Hz.
VA M P_50 (V ERTICA L AM PLITU DE) 4/3 50 Hz
VPO S_60 (VER TIC AL PO SIT IO N) 4/3 60 Hz
VA M P_60 (V ERTICA L AM PLITU DE) 4/3 60 Hz
HSH IFT_60 (HOR IZ ONT AL SH IFT ) 60H z
HSH IFT_50 (HOR IZ ONT AL SH IFT ) 50H z
FINV FH: ST EP FO R FINE T UNIN G IN VH F BA ND
VH F1_STEP: TH ICK TUN ING STEP FO R VH F1 BA ND
VH F3_STEP: TH ICK TUN ING STEP FO R VH F3 BA ND
UH F_STEP: TH IC K TU NING STEP FO R UH F BA ND
LP_C OAR SE: T HICK T UNIN G A DJUSTM EN T FO R L’
BG _COA RSE: THIC K TU NING A DJU STME NT F OR L A ND BG
BG _FIN E: FIN E TU NING A DJUST ME NT F OR L A ND BG
LP_FINE : FINE TUN IN G AD JUSTM EN T FO R L’
DE LAY SEAR CH:
XX XX XXX 0 -> SHO WS ‘PR OG RAM M E –‘
DU RING A UTO SEAR CH.
XX XX XXX 1 -> DH OW S ‘A UTO SEA RCH ’
DU RIN G A UTO SEA RCH
7
80H
05H
9FH
20H
00H
CCH
44H
34H
21H
A1H
32H
B2H
32H
20H
20H
18H
1FH
00H
00H
20H
20H
00H
1FH
20H
2BH
00H
90H
90H
90H
00H
00H
00H
12H
0FH
0FH
0FH
1DH
22H
00H
A4H
55H
55H
02H
0AH
00H
00H
00H
37GQ-20S
37GQ-21S
2FH
30H
31H
32H
33H
34H
35H
36H
37H
38H
3BH
0AH
05H
03H
02H
01H
01H
01H
03H
0FH
03H
00H
Do not use.
Just for
UK models
40H
3FH
VHF1_SP: STEP FOR AUTO SEARCH IN VHF1 BAND
VHF3_SP: STEP FOR AUTO SEARCH IN VHF3 BAND
UHF_SP: STEP FOR AUTO SEARCH IN VHF BAND
OLD_PROGRAM: FOR FLASHBACK RETURN
UHFHIGH: UPPER WINDOW LIMIT FOR UHF
VHF3HIGH: UPPER WINDOW LIMIT FOR VHF3
VHF1HIGH: UPPER WINDOW LIMIT FOR VHF1
PRG_NUMBER: CURRENT PROGRAMME NUMBER
WAITSUP: UPPER LIMIT DELAY TIME FOR AUTOSEARCH.
WAITINF: LOWER LIMIT DELAY TIME FOR AUTOSEARCH
SCART BLOKING:
00H = NO SCARTBLOCKING
01H = SCART BLOCKING WHEN ANY PR. IS IN CHILD
LOCK MODE.
RET_COL: DELAY IN COLOUR IDENTIFICATION IN AUTO
MODE.
CHECKSUM
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
10H
11H
12H
13H
14H
15H
16H
17H
18H
19H
1AH
1BH
1CH
1DH
1EH
1FH
20H
21H
22H
23H
24H
25H
26H
27H
28H
29H
2AH
ONE CHIP REGISTER 00:
ONE CHIP REGISTER 01:
ONE CHIP REGISTER 02:
ONE CHIP REGISTER 03:
ONE CHIP REGISTER 04:
ONE CHIP REGISTER 05:
ONE CHIP REGISTER 06:
ONE CHIP REGISTER 07:
ONE CHIP REGISTER 08:
ONE CHIP REGISTER 09:
ONE CHIP REGISTER 0A:
ONE CHIP REGISTER 0B:
ONE CHIP REGISTER 0C:
ONE CHIP REGISTER 0D:
ONE CHIP REGISTER 0E:
ONE CHIP REGISTER 0F:
ONE CHIP REGISTER 10:
ONE CHIP REGISTER 11:
ONE CHIP REGISTER 12:
ONE CHIP REGISTER 13:
ONE CHIP REGISTER 14:
ONE CHIP REGISTER 15:
ONE CHIP REGISTER 16:
ONE CHIP REGISTER 17:
ONE CHIP REGISTER 18:
ONE CHIP REGISTER 19:
ONE CHIP REGISTER 1A:
ONE CHIP REGISTER 1B:
ONE CHIP REGISTER 1C:
ONE CHIP REGISTER 1D:
ONE CHIP REGISTER 1E:
ONE CHIP REGISTER 1F:
VPOS_50 (VERTICAL POSITION) 4/3 50 Hz.
VAMP_50 (VERTICAL AMPLITUDE) 4/3 50 Hz
VPOS_60 (VERTICAL POSITION) 4/3 60 Hz
VAMP_60 (VERTICAL AMPLITUDE) 4/3 60 Hz
HSHIFT_60 (HORIZONTAL SHIFT) 60Hz
HSHIFT_50 (HORIZONTAL SHIFT) 50Hz
FINVFH: STEP FOR FINE TUNING IN VHF BAND
VHF1_STEP: THICK TUNING STEP FOR VHF1 BAND
VHF3_STEP: THICK TUNING STEP FOR VHF3 BAND
UHF_STEP: THICK TUNING STEP FOR UHF BAND
LP_COARSE: THICK TUNING ADJUSTMENT FOR L’
80H
05H
9FH
20H
00H
CCH
44H
34H
21H
A1H
32H
B2H
32H
20H
20H
18H
1FH
00H
00H
20H
20H
00H
1FH
20H
2BH
00H
90H
90H
90H
00H
00H
00H
12H
0FH
0FH
0FH
1DH
22H
00H
A4H
55H
55H
02H
3CH
05H
8
7EH
37GQ-20S
37GQ-21S
2BH
2CH
2DH
2EH
2FH
30H
31H
32H
33H
34H
35H
36H
37H
38H
3BH
3CH
3FH
BG_COARSE: THICK TUNING ADJUSTMENT FOR L AND BG
BG_FINE: FINE TUNING ADJUSTMENT FOR L AND BG
LP_FINE: FINE TUNING ADJUSTMENT FOR L’
DELAY SEARCH:
XXXXXXX0 -> SHOWS ‘PROGRAMME –‘
DURING AUTOSEARCH.
XXXXXXX1 -> DHOWS ‘AUTO SEARCH’
DURING AUTOSEARCH
VHF1_SP: STEP FOR AUTO SEARCH IN VHF1 BAND
VHF3_SP: STEP FOR AUTO SEARCH IN VHF3 BAND
UHF_SP: STEP FOR AUTO SEARCH IN VHF BAND
OLD_PROGRAM: FOR FLASHBACK RETURN
UHFHIGH: UPPER WINDOW LIMIT FOR UHF
VHF3HIGH: UPPER WINDOW LIMIT FOR VHF3
VHF1HIGH: UPPER WINDOW LIMIT FOR VHF1
PRG_NUMBER: CURRENT PROGRAMME NUMBER
WAITSUP: UPPER LIMIT DELAY TIME FOR AUTOSEARCH.
WAITINF: LOWER LIMIT DELAY TIME FOR AUTOSEARCH
SCART BLOKING:
00H = NO SCARTBLOCKING
01H = SCART BLOCKING WHEN ANY PR. IS IN CHILD
LOCK MODE.
RET_COL: DELAY IN COLOUR IDENTIFICATION IN AUTO
MODE.
CHECKSUM
•PIF/AGC Adjustement
•Screen Adjustement
1. B/G AFT Adjustment
1 . Connect the output of SSG (Standard Signal
Generator) to the tuner IF output terminal.
•SSG output 38.9 MHz (CW) ± 5 KHz.
•SSG output level: approx. 90 dBµV.
2 . Enter into Service Mode.
3 . Push «2» key on R/C. «FI OK» will appear.
4 . Switch set OFF and ON again, setting is now
memorized.
3. Focus Adjustment
0AH
00H
00H
00H
0AH
05H
03H
02H
01H
01H
01H
03H
0FH
03H
00H
Do not use.
Just for
UK models
40H
7EH
1. Apply mains voltage of 220V AC/50HZ to TV.
2. Receive Philips pattern signal to a level
between 60 and 80 dB µV.
3. Set contrast to 10/10, brightness to 5/10
and colour 0/10.
4. Adjust focus potentiometer to obtain
maximum definition.
2. RF-AGC STR Adjustment
1. Receive the «COLOUR BAR» signal (Channel E12). Signal strength: 57 dBµV.
2. Enter into Service Mode.
3. Push CH until AGC STR appears on screen.
4. Push «7» key of R/C.«AGC OK» will appear.
5. Switch set OFF and ON again, setting is now
memorized.
9
4. G2 Adjustment
1. Apply mains voltage of 220V AC/50HZ to TV.
2. Receive cross hatch pattern signal to a level
between 60 and 80 dBµV.
3. Apply High Voltage Probe to Pin 8 of CRT socket
4. Adjust G2 potentiometer until obtaining 525V
±10%.
5. Check BKGD. If it is necessary adjust BKGD
according to instructions detailed in the next
page.
37GQ-20S
37GQ-21S
•GEOMETRY ADJUSTMENT PROCEDURE
1. HOR POS
a) Receive Philips pattern signal.
b) When
∧ button is pressed, picture moves to the left.
c) When ∨
button is pressed, picture moves to the right.
d) Adjust the horizontal location to obtain picture centering (Fig.1).
Fig. 1
2. VERT POS
a) Receive Philips pattern signal.
∧ button is pressed, picture moves up.
b) When
button is pressed, picture moves down.
c) When ∨
d) Adjust the vertical location to obtain picture centering (Fig.2).
Fig. 2
3. VERT AM
a) Receive Philips pattern signal.
∧ button is pressed, vertical size of picture increases.
b) When
button is pressed, vertical size of picture decreases.
c) When ∨
d) Adjust the vertical size to obtain picture overscan (Fig.3).
Fig. 3
•COLOUR ADJUSTMENT (BKGD) PROCEDURES
The following adjustments are required when the Picture Tube or IC801 are replaced, or
may be necessary after adjustment of the G2 voltage.
(0: Black ... 7: White)
1. «B-GAIN», «G-GAIN»
6 5 4 3 2 1 0
a) Adjust G2.
Gain
point
b) Tune a grey scale pattern.
c) Adjust colour to minimum.
3
7
4
0
d) Fix R-GAIN value to 50.
e) Position colourmeter in the the left point of Fig.4.
Fig. 4
DC point
f) Using brightness and contrast buttons, select a luminance of ≈120 nits.
g) Operate again in Service Mode and select location B-GAIN and
G-GAIN to obtain colour coordinates:
X = 0.290 ± 0.015
Y = 0.300 ± 0.015
h) Exit Service Mode and check colour coordinates «X» and «Y» at 20 and 120 nits. It may be
necessary to repeat the same procedure or re-adjust the cuts as show the be below one.
2. «G-DC», «R-DC»
a) Adjust G2, in the case that it has not been made previously.
b) Tune a grey scale pattern.
c) Adjust colour to minimum.
e) Position colourmter in the the right point of Fig.4.
f) Using brightness and contrast buttons, select a luminance of ≈20 nits.
g) Operate again in Service Mode and select location G-DC and R-DC to obtain colour
coordinates:
X = 0.290 ± 0.015
Y = 0.300 ± 0.015
h) Exit Service Mode and check colour coordinates «X» and «Y» at 20 and 120 nits. It may be
necessary to repeat the same procedure or the previous one.
NOTE: Locations «R» alter «X» coordinates; «G» alter «Y» coordinates; «B» alter «X» and «Y»
coordinates.
10
37GQ-20S
37GQ-21S
DESCRIPTION OF SCHEMATIC DIAGRAM
SAFETY NOTE:
1. DISCONNECT THE AC PLUG FROM THE AC
OUTLET BEFORE REPLACING PARTS.
2. SEMICONDUCTOR HEAT SINKS SHOULD BE
REGARDED AS POTENTIAL SHOCK HAZARDS
WHEN THE CHASSIS IS OPERATING.
NOTE:
1. The unit of resistance «ohm»is omitted (K=1000
ohms. M= Megaohm).
2. All resistors are 1/8 watt. unless otherwise noted.
3. All capacitors are µF, unless otherwise noted (P=
µµF).
4. The capacitor with Part No. RC-FZ9XXXBMNJ is
designed to with stand 63V.
IMPOTANT SAFETY NOTE:
SERVICE PRECAUTION:
PARTS MARKED WITH « ! » (
) ARE
IMPORTANT FOR MAINTAINING THE SAFETY
OF THE SET. BE SURE TO REPLACE THESE
PARTS WITH SPECIFIED ONES FOR
MAINTAINING THE SAFETY AND PERFORMANCE OF THE SET.
THE AREA ENCLOSED BY THIS LINE (
)
IS DIRECTLY CONNECTED WITH AC MAINS
VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN
ISOLATING TRANSFORMER BETWEEN TV
RECEIVER AND AC LINE TO ELIMINATE
HAZARD OF ELECTRIC SHOCK.
CAUTION
This circuit diagram is original one,
therefore there may be slight difference
from yours.
WAVEFORM MEASUREMENT CONDITION:
Colour bar genetator signal of 70 dB from RF input.
CH1
100V
A 2µs 200V VERT
CH1
100V
A 2µs 100V VERT
gnd
CH1
2V A 10µs -1.00V VERT
CH1 200V A 10µs 200V VERT
gnd
2
3
CH1
CH1
FREQ = 100KHz
P-P = 504 V
CH1
CH1
CH1
1V
CH1 500mV A 5ms 1.00V VERT
A 5ms 2.50 V VERT
1V
A 10µs 1.00V VERT
gnd
gnd
1
CH1
FREQ = 100KHz
P-P = 472 V
CH1
CH1
gnd
4
FREQ = 15.6KHz
P-P = 8.56 V
CH1
CH1
CH1 500mV A 5ms -500mV VERT
5
FREQ = 15.6KHz
P-P = 1.00 kV
CH1 10V A 5ms -10.0mV VERT
CH1
CH1
FREQ = 15.6KHz
P-P = 5.40 V
CH1
1V A 5ms 2.50 V
VERT
gnd
gnd
gnd
gnd
gnd
6
CH1
CH1
7
FREQ = 50.0 Hz
P-P = 4.80 V
CH1
CH1
CH1 5V A 500µs 0.0 V VERT
8
FREQ = 50.0 Hz
P-P = 1.48 V
CH1
CH1
CH1 500mV A 10µs TVFLD 25
9
FREQ = 50.0 Hz
P-P = 1.94 V
CH1 20V A
CH1
CH1
10µs 150 V VERT
10
FREQ = 50.0 Hz
P-P = 38.4 V
CH1 20V A
CH1
CH1
10µs 150 V VERT
FREQ = 1.00 KHz
P-P = 4.44 V
CH1 20V A
10µs 150 V VERT
gnd
11
CH1
CH1
gnd
FREQ = 412 Hz
P-P = 16.8 V
12
CH1
CH1
gnd
FREQ = 15.6 KHz
P-P = 1.84 V
13
CH1
CH1
gnd
FREQ = 15.6 KHz
P-P = 74.4 V
13
14
CH1
CH1
gnd
FREQ = 15.6 KHz
P-P = 72.8 V
15
CH1
CH1
FREQ = 15.6 KHz
P-P = 70.4 V
2
3
(G)
N0207CE
N0304CE
Page 15
1
C702
10nF
(250V)
KZ0029
P0028
PR701
4
14
5
47uF
(400V)
EZ0140BM
C705
(250V)
KZ0029
L701
S701
C701
470nF
(275V)
FZ0160BM
P0588
6
R703
22
R715
10
D717
1N4937
D
IC701
R716
47K
(1/2W)
JF15
D705
D716
DX0551BM
C718
47nF
400V
(H)
N0461CE
FB701
4
3
C723
100pF
1
(L2)
(K)
T701
5
5
3
8
Z0580BM
D812
DX0045
D811
DX0045
R888
0
4
3
A
7
14
13
12
11
15
16
N0561
(200V)
C878
10uF
D861
2
2
R879
470
Q871
TX0181
BF422
(2W)
R864
15K
R898
0
Q883
TX0180BM
R892
1K
D708
DX0561
D710
D721
DX0504
D722
DX0504
(2KV)
220pF
C728
DX0505
D707
QTIPM0017CEFM
FB702
BLN-0037CE
1
C871
470pF
R862
15K
(2W)
D709
DX0590BM
MBR1100RL
470pF
DX0045
C862
R880
470
Q870
TX0181
BF422
R866
15K
(2W)
C711
100uF
(160V)
D862
C713
220uF
(16V)
+10V
+20V
C872
470pF
470pF
DX0045
C861
+105V
F
R702
470K
(1/2W)
R701
470K
(1/2W)
CILF0160BM
C707
10uF
(16V)
DX0571
D704
D703
DX0571
C704
10nF
DX0571
DX0571
D702
JF13
-10V
C712
220uF
(16V)
C715
100nF
C710
220uF
(25V)
R718
4K7
JF11
R881
470
Q872
TX0181
BF422
470pF
R710
220
(1/2W)
2SA1037
Q705
Q702
TX0218
BC337-40
(L3)
QTIPM0017CEFM
L861
12uH
4.7nF
(2KV)
C876
15
2K7
(1/2W)
2K7
(1/2W)
R887
2K7
(1/2W)
R885
R883
Q887
TX0180BM
R894
1K
C873
470pF
C874
1nF
(500V)
D860
DX0045
C860
C879
100pF
QPWBF7287BMN0
R899
0
Q885
TX0180BM
R893
1K
R724
150
390
R725
+8V
12
8
6
4
5
3
9
7
13 14
FOCUS
H
(250V)
KZ0029
D701
C703
10nF
T3.15
F701
2
E
14
13
12
11
10
9
8
1
220nF
C507
3
9
5
4
7
CRT
VB34EAC0136*N
R502
1K
+10V
K0079GE
K0079GE
R524
3K9
S1002
S1001
L3
I
GND
VCC
12
D
D
D
D
(A)
B
6
8
G
1
C
SCHEMATIC DIAGRAM.
-2
37GQ-20S
37GQ-21S
Page 16
Page 14
10
3
C610
22nF
Q604
2SC2412
R608
18K
Q701
2SC2412
C708
15nF
14
13
12
11
10
9
8
GND
VCC
12
D
D
D
D
GND
FB
3
D
D
D
D
R704
100
R722
120
R706
680
(TQ)
R603
330
(1/2W)
+7V
C603
220uF
(10V)
R705
330
(TQ)
(1%)
IC701
TDA16833
D706
C6V2
EX0584
1
2
3
4
5
6
7
11
15
12
27
(1/2W)
27
(1/2W)
C604
220uF
(10V)
R611
R610
Q603
TX0112
BC636
L601
4.7uF
(CF)
R609
2.2
(1/2W)
Q601
TX0132
BU508D
6.8
(1/2W)
4
R606
6.8
(1/2W)
Q602
BC635
C724
100pF
R607
1
(1/2W)
D603
DX0045
BLN-0020
R604
470
(1/2W)
R605
D601
DX0551
C722
10uF
(16V)
C717
10uF
(16V)
DX0551
C601
5n6
1K5
8M2
(1/2W)
(UA)
R707
C709
2n2
(4Kv)
6
5
C602
470pF
2KV
DX0505
1N4935
D602
8M2
(1/2W)
(UA)
R708
10
9
14
13
C725
2n2
(4Kv)
5
2
9
4
+105V
DX0503
1N4933
DX0504
1N4934
D711
D710
T601
NF2072BM
R720
560
(1/2W)
C714
470uF
(10V)
D723
DX0503
D721
DX0504
R719
2K7
H.V.
11
7
10
G2
FOCO
D604
DX0506
1N4936
C605
100nF
R617
1K
R538
2K2
D718
5V6
D714
B5V6
820
(1/2W)
R714
-10V
220uF
(16V)
+5V. B
R721
22
C713
220uF
(16V)
Q707
TX0217
Q706
2SA1037
L602
22uH
(CF)
8
FB701
C723
100pF
3
D705
6
9
D607
EX0549BM
7V5
R612
2.7
(1W)
R535
820K
Q509
2SA1037
R711
22
330nF
C503
R723
1K
C606
22nF
R613
15K
J67
1uF
4
3
2
1
Q507
2SC2412KQ
Q505
2SA1037
R533
120K
+8V
R530
180K
R519
8K2
R614
560
+8V
7
R517
180K
2SC2412KQ
D712
6V2
(2%)
C726
2.2uF
Q708
R710
220
(1/2W)
+5V A
Q703
TX0218
BC337-40
R718
4K7
4
3
2
1
-VS
+
_
560
R523
10
(1/2W)
DX0504
1N4934
D605
-25V
5
6
7
8
R537
15K
+VS
IC501
UA741
+105V
R516
1K
R615
N0461CE
(H)
R534
1K5
C510
100pF
120
R525
Q506
2SA1037
220nF
100uF
(35V)
C607
3K3
(1/2W)
R616
R536
4K7
8
+10V
-10V
R509
1K
R502
1K
(F)
N0505CE
100
1
SER
.
R
DX0
1N4
D60
68K
10K
R513
R512
470nF
(250V)
FZ0174BM
C609
R1027
C608
1uF
(160V)
Q502
BC635
D503
1N4933
R510
1
(1/2W)
Q501
BC636
PC3
8
J77
R703
22
Page 17
37GQ-20S
37GQ-21S
I
H
G
F
E
D
C
B
A
13
14
Page 14
2
G
3
R811
100
1
R812
100
R1006
100
100
R1005
100
R1004
100
R1002
VERT
FLB
VSYNC
PA3
PA2
PA1
PA0
PB6
PB5
PB4
PB3
PB2
PB1
DA5
43
R
FB
R
G
B
C901
100nF
X801
C811
100nF
C810
100nF
100nF
C809
R1025
4K7
IC1001
ST6387
R806
1K
R805
1K
53
52
51
50
49
R1024
4K7
XTAL
BTUN
HALFCTR
FBOSD
ROSD
G
R804
1K
R803
220
220
R802
220
R801
R1007
100
11
10
9
8
7
6
5
4
3
2
1
C1009
47uF
(10V)
R
TX0108BM
BC635
R810
100
4
100
R1003
R1001
100
C1001
470uF
(6.3V)
C1010
100nF
270
44
2
J19
3K3
R807
1K
VSYNC
OSD
OSD
26
XTAL
XTAL
RESET
VS
PC7
PC6
PC5
R1021
4K7
10
PC5
D807
5V6
23
24
25
26
27
28
29
30
31
32
33
D806
5V6
R1022
4K7
D805
5V6
X1001
8MHz
3
VERT
VSYNC
3
R315
10K
D1002
5V6
D804
5V6
10nF
C309
C302
1uF
DX0045BM
R314
1K D301
C308
1uF
L1002
68uH
FLB
VSYNC
6
R1018
10K
C1012
100nF
R1023
4K7
33K
R303
1uF
330K
C819
R822
C1011
22nF
R1020
5K6
C1005
15pF
C1004
15pF
22pF
C1003
22pF
C1002
1
C312
220uF
(10V)
CVBSIN2
BS
BEXT
GEXT
REXT
IC1004
PST529
1
R1026
0
1K
R321
28
29
30
31
32
R1032
39K
R312
10K
R311
100K
R306
100K
4K7
(1/2W)
4K7
(1/2W)
220K
R222
Q1002
2SC2412
R1019
1K
R307
1uF
C805
C808
100nF
C1014
10uF
(16V)
330nF
C1015
C806
100nF
Q1001
PH2369
R1014
22K
C807
100nF
R1034
150K
C1007
22nF
(1/2W)
(1/2W)
(1/2W)
33K
SCL
AUDIO
SDA
R826
75
R824
75
R823
1K
L/L'
BU
FB301
BLN0037
JF16
BH
BL
AGC
SS
C1008
47nF
VT
+105V
C304
100uF
(16V)
R1015
22K
R1013
4K7
Q302
BC327
TX0216
3.3uH
(DF)
L301
Q301
BC337
TX0217
R304
2.2
(1/2W)
R1012
4K7
Q304
2SC2412
R1010
R1033
4K7
Q305
2SC2412
R313
560
R310
100
R305
4K7
(1/2W)
+20V
R1011
4K7
C303
1uF
(160V)
10K
C307
47uF
(16V)
IC1003
IX10037
Q1003
2SA1037KQ
C1006
22pF
R1009
1K
R1008
3K3
R318
15K
2SA1037
Q303
100pF
C315
R302
R301
R825
75
C820
(S)
11
S
R221
(SH)
C222
C311
.047
L302
3.3uH
QPWBF7310BMN0
R317
470
2
6
7
B
G
R
FB
ONLY FOR 37GQ-21S
1
5
4
3
R316
470
C310
.047
J301
J0047CE
6
Q503
-25V
R809
47K
R808
1K
5
(K)
N0561
R1016
330
L1001
10uH
(DF)
R1017
42
DA4
13
12
12
DA3
PA4
41
DA2
40
DA1
PA5
14
DA0
PA6
15
3
R
18
PA7
16
38
SCL
39
VDD
37
19
VSS
17
36
PC2
SDA
35
PC3
B
20
BLANK
21
G
48
GOSD
1
45
34
22
PC4
47
BOSD
+5V B
R
ROUT
HSYNC
46
ISENS
D1001
PX0104BM
44
GOUT
K0079GE
41
S1004
43
BOUT
K0079GE
40
S1003
42
UOUT
K0079GE
39
YIN
S1002
36
RMC001
CU0222CE
38
.
+20V
37
K
VOUT
B
YOUT
I
VIN
G
UIN
16
B
APR
J
2
L
2
M
33
N
35
O
5
34
P
4
CHR
Q
3
FB
R
2
Y/C
1
Page 17
+105V
37GQ-20S
37GQ-21S
7
B
I
7
F)
0505CE
1
70nF
250V)
Z0174BM
609
10K
R513
CLK
100
.
PC5
Page 15
3
100
R1029
D505
DX0551
4
DAT
SERVICIO
.
5
R515
100
100
SCL
R1030
D506
DX0551
R511
1.8
(1/2W)
.
SDA
.
GND
100
R1031
R816
2K7
SC401
CZ2107BM
R815
22K
DX0045BM
C814
1uF
1M
R814
7,5V
D402
7,5V
D401
R401
75
(TQ)
C401
1uF
D409
EX0549BM
7V5
R602
470
R821
8K2
R601
2K2
R404
75
(TQ)
D404
7,5V
2K2
D405
7,5V
R405 R406
75
75
(TQ)
(1/4W)
D406
7,5V
R403
220
Q401
2SC2412
R820
100
D808
5V6
SSC
HOUT
VERT
BCL
CVBOUT2
VCC
CVBSOUT1
GND
VAMP
+5VA
5
64
63
62
61
60
59
58
57
CLPF
XTAL
XTAL
BTUN
HALFCTR
G
REALIZADO
G
D407
7,5V
(DF)
L801
3.3uH
AUDIO
SDA
SCL
C818
100nF
100uF
(6.3V)
C817
R407
75
(TQ)
10K
R408
SS
1nF
R413
220
(TQ)
C404
R411
6K8
D403
C5V6
1uF
1nF
R414
220
(TQ)
C405
L OUT
R OUT
V OUT
MODELO
FECHA
NOMBRE
SQUAD
JF17
D412
EX0549BM
7V5
SCART
47uF
(16V)
TUNER
EX0549BM
7V5
D411
C203
330nF
(25V)
1
2
3
4
5
6
10
11
R201
220
100nF
C802
5
4
SF201
G1968M
C210
100nF
2
10nF
C214
10nF
C213
10nF
C212
10nF
C211
R213
33K
+5VA
4K7
C215
47uF
(10V)
R212
+5VA
L802
3.3uH
+5VA
C221
100pF
100
12uH
(DF)
R219
2K2
R220
L202
1
1uF
C820
TU201
RTUNH0138BMZZ
12
FILC0020
CF201
+8V
R826
75
ELECTRONICA ESPANA S.A.
SHARP
1:1
ESCALA
Q K I T P 7 2 8 7 B M N *
CODIGO
AGC
VT
BU
BH
BL
5V
IF OUT
IFOUT
C209
100uF
(6.3V)
C223
8,2pF
(500V)
C801
470uF
(10V)
R204
150
L201
390mH
08-03-2000
R415
100K
C408
R416
47
C202
1nF
22pF
C201
C808
100nF
37GQ-20S/21S
R417
2.2uH
17
18
19
20
21
22
23
24
1uF
C805
BL
DATE:
R410
C406
22uF
100K
R412
6K8
C205
1uF
R IN
APROBADO
1nF
C409
C207
10uF
(16V)
C206
22nF
IFPLL
GND IF
AM/FMOUT
VCC
CVBS
AUDIN
IF1
IF2
VCC
25
26
27
28
29
30
1
2
3
4
5
6
C216
220nF
R211
47K
REVISIONES
MOD. HASTA No.93
16-03-2000
MOD. HASTA No. 81
MOD. HASTA No.57
10-02-2000
FECHA
MOD. HASTA No.59
11-02-2000
08-03-2000
MOD. HASTA No.79
MOD. HASTA No.76
B
24-02-2000
1K
R203
1K
R202
100nF
C222
Page 16
07-03-2000
C224
220nF
Q204
2SC2412
(0)
R221
VT
DATE:
VERIFICADO
B
F401
LN0037
D410
EX549BM
7V5
JF18
R409
4K7
C301
3.3uF
C208
IC801
STV2236
CVBSIN1
GND
CVBSIN2
BS
BEXT
N
13
DATE:
R
R418
0
+8V
R819
100
C816
4n7
D810
6V8
R817
R818
27K
D802
DX0551
C803
470uF
(10V)
R420
0
C822
100uF
(16V)
C815
2.2uF
D803
C5V1
68
(1/2W)
R402
C804
100nF
C813
4n7
56
55
54
53
52
51
12
SER
.
R1028
2
DX0505
1N4935
D606
68K
PC3
D801
20
R512
J80
PC2
C508
330nF
J79
R529
150
(1/2W)
J91
C812
100nF
19
+8V
21
R813
27K
FB
16
9
17
X801
B0243
4.43MHz
14
C901
100nF
15
)
J77
AGC
12
BU
13
2
VCC
4
SLPF
1
11
3
SCL
10
R804
1K
18
R
9
TX0108BM
BC635
5
AUDIO
6
FMCAP
7
GND
SS
8
8
SIFIN
9
AGC
10
VIF
11
AGC
12
PIFIN
13
SIFIN
6
14
AGC
16
SAW
15
PIFIN
2
SDA
B
7
11
5
17
4
10
3
9
1
8
3
Q503
37GQ-20S
37GQ-21S
14
R
BH
Q
P
O
N
L IN
M
FS
V IN
L
J78
K
J
J92
37GQ-20S
37GQ-21S
TROUBLESHOOTING TABLES.
NO PICTURE
Check Picture
setting by R/C. Signal
should be received.
Check the tuner supply
and band biases. Both
must be approx. 5V DC
Normal
NO
Is tuning voltage
normal at
Pin (2) of Tuner?
Check Q1001,
IC1001, IC1003
YES
-Check the AGC Voltage:
Pin (1) of Tuner.
-Check the SAW Filter: SF201
23
37GQ-20S
37GQ-21S
NO SOUND
Check Sound setting by
R/C. Signal should be
received.
NO
Does
approx. 20V DC
appear on
C710?
YES
Check D707, C710
Does
Sound Signal
appear at Pin(6)
of IC801?
NO
Check IC801, C301
YES
Is
Audio Amplifier
muted?
YES
NO
Check IC1001, Q305
Check R304, Q301, Q302
24
37GQ-20S
37GQ-21S
NO RASTER
Fuse Blown
Check F701
Normal
Replace Fuse
Check Voltage on C705
(Approx. 325V DC)
Fuse Blown
again
Normal
Check IC701
Approx. 0V
Check Voltage on C711
(Approx. 105V DC)
Abnormal
Normal
Normal
Check D708, D717
Check CRT connector
K1... K5 bias
Normal
Normal
Check D701, D702, D703,
D704, C705.
Check Q601,
Check Q601, C711
C711
Check R705, R706,
R715, D706
25
Check C878
Abnormal
Check IC801
37GQ-20S
37GQ-21S
NO VERTICAL SCAN
Is IC501
bias normal?
YES
Check R510, Q501,
Q502, Q503
NO
Check D709, D710, IC501
NEITHER VERTICAL NOR
HORIZONTAL SYNCHRONIZATION
Check IC801, C815, C816, R818
DEFECTIVE VERTICAL AMP.
AND VERTICAL LINEARITY
Readjust Vertical Size.
Vertical size is abnormal
Vertical linearity is abnormal
Check Q505, Q507, Q509
Check D505, D506
26
37GQ-20S
37GQ-21S
NO SPECIFIC COLOUR
NO
Is
some colour
produced in B/W Broadcast
reception?
YES
Check IC801, C812,
C813, R813, X801
Is
the white
balance properly
adjusted?
YES
The Picture Colour is
Red or cyan.
The Picture Colour is
green or magenta.
The Picture Colour is
Blue or Yellow.
Check Q871, Q883 and
their adjacent circuits.
Check Q870, Q885 and
their adjacent circuits.
Check Q872, Q887 and
their adjacent circuits.
UNLOCKED COLOUR
(NO COLOUR SYNCHRONIZATION)
Check setting of Colour
Standard in Service
Mode.
Normal
Check IC801, C812,
C813, R813, X801
27
NO
Readjust The White
Balance.
37GQ-20FP
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