37GQ-20H SERVICE MANUAL SEJB37GQ20H02 Issued: 9th June ‘00 SQUAD CHASSIS PAL SYSTEM COLOUR TELEVISION MODEL 37GQ-20H 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 SCHEMATIC DIAGRAM, WAVE FORMS..... .13 IMPORTANT SERVICE NOTES.......................3 SERVICE ADJUSTEMENTS.............................
37GQ-20H 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.
7GQ-20H 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.
37GQ-20H 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.
37GQ-20H 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 0
37GQ-20H 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 00H PRG _NUM B ER: CU RREN T PRO GRA M ME NU MBE R 01H 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 V2 µ Proc.
37GQ-20H 2FH 30H 31H 32H 33H 34H 35H 36H 37H 38H 3Bh 0AH 05H 03H 00H 00H 00H 00H 01H 0FH 03H 00H V2 µ Proc. Version or upper. 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.
37GQ-20H 2BH 2CH 2DH 2EH 2FH 30H 31H 32H 33H 34H 35H 36H 37H 38H 3Bh 3CH 3FH BG _COA RSE: TH IC K TU NING AD JU STM ENT FOR L AN D BG BG _FIN E: FIN E TU NING AD JU STM ENT FOR L AN D BG LP_FINE : FINE TUN IN G A DJUST ME NT FO R L’ DE LAY SEAR CH: X XXX XXX 0 -> SHO W S ‘P ROG RAM M E –‘ D URING AU TOSEA RCH .
37GQ-20H •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.
37GQ-20H 11
37GQ-20H 12
37GQ-20H 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.
B 2 3 (G) N0207CE C702 10nF (250V) KZ0029 P0028 PR701 4 14 5 47uF (400V) EZ0140BM C705 (250V) KZ0029 L701 S701 C701 470nF (275V) FZ0160BM P0588 R716 47K (1/2W) JF15 6 R715 10 R703 22 D717 1N4937 D716 DX0551BM D705 DX0551 C718 47nF 400V FB701 4 3 C723 100pF 1 (L2) (K) T701 5 3 8 Z0580BM D812 DX0551 D811 DX0551 R888 0 4 3 R879 470 2 Q871 TX0181 BF422 13 2 12 11 15 16 R726 0 (TQ) D710 DX0504 (2W) R864 15K R898 0 Q883 TX0180BM R892 1K D721 DX0504 D722 DX
Page 14 9 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 R603 330 (1/2W) +7V C603 220uF (10V) R705 330 (TQ) 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) Q602 BC635 TX0108BM Q601 TX0132 BU508D 6.8 (1/2W) 6.
Page 14 3 R811 100 2 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 FB R G B R1025 4K7 R1024 4K7 IC1001 ST6387T1/FMI/TR C901 100nF X801 C811 100nF C810 100nF 100nF C809 R806 1K R805 1K XTAL BTUN HALFCTR FBOSD ROSD 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 X1
27 (F) N0505CE 1 470nF (250V) FZ0174BM C609 SER . PC3 . PC5 CLK 100 R1028 2 DX0505 1N4935 D606 68K 10K R513 R512 J80 3 100 R1029 D505 DX0551 4 Page 15 DAT 5 R515 100 100 SCL R1030 D506 DX0551 R511 1.8 (1/2W) . SDA .
37GQ-20H REF No. PARTS PART LIST REPLACEMENT PARTS Replacement parts which have special safety characteristics are identified in this manual. Electrical components having such features are identified by in the Replacement Part List. The use of a substitute replacement part which does not have the same safety characteristics as the factory recommended is not permitted. Replacement parts not shown in this service manual may create shock fire, or other hazards.
37GQ-20H REF No. PARTS L L L L ! ! ! DESCRIPTION 0801 0802 1001 1002 VP-DF3R3K0000 VP-NM3R3MR19N VP-DF100K0000 VP-NM680K3R5N PEAK COIL 3,3UH 10% COIL 3,3UH SMD PEAK COIL 10UH 10% COIL 68UH SMD CF 0201 SF 0201 X 1001 RFILC0023CEZZ RFILC0282BMZZ RFILC0121GEZZ SOUND FILTER (TAPED) SAW FILTER J1952M 38.90MHZ FILTER CST8.
37GQ-20H REF NoPARTS ! ! ! ! R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R 0310 0311 0312 0313 0314 0315 0318 0321 0401 0402 0403 0404 0405 0406 0407 0408 0409 0410 0411 0412 0413 0414 0415 0416 0417 0418 0420 0502 0509 0510 0511 0512 0513 0515 0516 0517 0519 0523 0524 0525 0529 0530 0533 0534 0535 0536 0537 0538 0601 0602 0603 0604 0605 0606 0607 0608 0609 0610 0611 0612 0613 0614 0615 0616 0617 0701 0702 07
37GQ-20H REF No PARTS R R R R R R R ! ! 1028 1029 1030 1031 1032 1033 1034 VRD-RA2BE101J VRD-RA2BE101J VRS-TV1JD101J VRS-TV1JD101J VRS-TV1JD393J VRS-TV1JD472J VRS-TV1JD154J DESCRIPTION RES 100 OHM 5% 1/8W RES 100 OHM 5% 1/8W 2125 100 OHM 5% 1/10W SMD 2125 100 OHM 5% 1/10W SMD 2125 39KOHM 5% 1/10W SMD 2125 4.
37GQ-20H 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.
37GQ-20H NO SOUND Check Sound setting by R/C. Signal should be received. NO Does approx.
37GQ-20H 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.
37GQ-20H 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.
37GQ-20H 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.
37GQ-20H NOTES: 27
37GQ-20FP RECICLED PAPER PRINTED BY: 22 ON:
