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Sharp 37GQ-20FP Service Manual

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ELECTRICAL SPECIFICATION.......................2
IMPORTANT SERVICE NOTES.......................3
SERVICE ADJUSTEMENTS.............................4
PRINTED WIRING BOARDS...........................11
SHARP CORPORATION

SERVICE MANUAL

PAL / SECAM SYSTEM COLOUR TELEVISION
37GQ-20FP
MODEL
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
SCHEMATIC DIAGRAM, WAVE FORMS..... .13
PART LIST.......................................................18
TROUBLESHOOTING TABLES.....................22
1
37GQ-20FP
SEJ37GQ20FP02
Issued: 9th June '00
SQUAD
CHASSIS
This document has been published to
be used for after sales service only.

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  • Page 1: Service Manual

    37GQ-20FP SERVICE MANUAL SEJ37GQ20FP02 Issued: 9th June ‘00 SQUAD CHASSIS PAL / SECAM SYSTEM COLOUR TELEVISION 37GQ-20FP MODEL 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.

  • Page 2: Electrical Specifications

    37GQ-20FP ELECTRICAL SPECIFICATIONS •Sound Carrier Trap •Power Input .......220V-240 Volts AC 50Hz L’............40.4MHz •Power Consumption L............32.4MHz B/G............33.4MHz Normal Operating........30W •Adjacent Sound Carrier Trap Stand-by Operating........7.5W L’............32.4MHz (Method IEC60107) L, B/G...........40.4MHz •Audio Power Output Rating .....2W (MPO) •Adjacent Picture Carrier Trap Ω...

  • Page 3: Important Service Notes

    37GQ-20FP 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.

  • Page 4: Service Adjustment

    37GQ-20FP 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.
  • Page 5 37GQ-20FP 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,...
  • Page 6 37GQ-20FP 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:...
  • Page 7 37GQ-20FP VH F1HIGH : U PPER WIND OW LIM IT FOR V HF1 PRG _NUM B ER: CU RREN T PRO GRA M ME NU MBE R W AITSUP : U PPER L IM IT DE LAY TIME FOR A UTO SEAR CH.
  • Page 8 37GQ-20FP 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...
  • Page 9 37GQ-20FP BG_COARSE: THICK TUNING ADJUSTMENT FOR L AND BG 05H 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...
  • Page 10 37GQ-20FP •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).

  • Page 11: Printed Wiring Boards

    37GQ-20FP PRINTED WIRING BOARD (Version N1 A) Component side. J302 RMC001 K7287BM D1001 F7287BMN1 S1001 S1002 S1003 C1009 S1004 S701 J301 R864 C701 JL1, R885 C878 F7296BMN1 Q885 C876 (SH) R883 (S). Q302 R862 Q883 Q301 JF12 C874 F701 C302...
  • Page 12 37GQ-20FP PRINTED WIRING BOARD (Version N1 A) Copper side. J302 RMC001 C313 F7287BMN1 C1009 S1004 S1003 S1002 S1001 R319 C314 S701 R864 C878 J301 R898 R320 C310 C701 JF16 D862 F7288BMN1 C861 R893 R885 Q885 Q304 C876 R883 Q302 R892...

  • Page 13: Description Of Schematic Diagram

    37GQ-20FP DESCRIPTION OF SCHEMATIC DIAGRAM NOTE: SAFETY NOTE: 1. The unit of resistance «ohm»is omitted (K=1000 1. DISCONNECT THE AC PLUG FROM THE AC ohms. M= Megaohm). OUTLET BEFORE REPLACING PARTS. 2. All resistors are 1/8 watt. unless otherwise noted.
  • Page 14 37GQ-20FP Page 16...
  • Page 15 37GQ-20FP Page 17...
  • Page 16 37GQ-20FP...
  • Page 17 37GQ-20FP R OUT R IN L OUT L IN V OUT V IN...

  • Page 18: Part List

    37GQ-20FP REF No. PARTS DESCRIPTION * CODE PART LIST Q 0706 VS2SA1037KQ-1 TRT BC807 SMD S AA REPLACEMENT PARTS Q 0707 RH-TX0217BMZZ TRT BC337 PHILIPS S AB Q 0708 VS2SC2412KQ-1 TRT 2SC2412 ROHM S AA Replacement parts which have special safety characteristics are identi- fied in this manual.
  • Page 19 37GQ-20FP REF No. PARTS DESCRIPTION * CODE REF No. PARTS DESCRIPTION * CODE L 0601 VP-CF4R7K0000 PEAK COIL 4,7UH 10% S AB C 0610 VCKYTV1HB223K CERAM C 22NF 50V 2125SMD S AA L 0602 VP-CF220K0000 PEAK COIL 22UH 10% S AA...
  • Page 20 37GQ-20FP REF No. PARTS DESCRIPTION * CODE REF No. PARTS DESCRIPTION * CODE R 0215 VRS-TV1JD561J 2125 560 OHM 5% 1/10W SMD S AA R 0606 VRD-RA2HD6R8J RES 6,8 OHM 5% 1/2W S AA R 0216 VRS-TV1JD470J 2125 47 OHM 5% 1/10W SMD...
  • Page 21 37GQ-20FP REF No. PARTS DESCRIPTION * CODE REF No. PARTS DESCRIPTION * CODE R 1009 VRS-TV1JD102J 2125 1KOHM 5% 1/10W SMD S AA DIODES R 1010 VRS-TV1JD273J 2125 27KOHM 5% 1/10W SMD S AA D 0811 RH-DX0551BMZZ DIODE LL4148 TFK SMD...

  • Page 22: Troubleshooting Tables

    37GQ-20FP 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 Is tuning voltage normal at Pin (2) of Tuner? Check Q1001, IC1001, IC1003 -Check the AGC Voltage: Pin (1) of Tuner.
  • Page 23 37GQ-20FP NO SOUND Check Sound setting by R/C. Signal should be received. Does approx. 20V DC appear on C710? Check D707, C710 Does Sound Signal appear at Pin(6) of IC801? Check IC801, C301 Audio Amplifier muted? Check IC1001, Q305 Check R304, Q301, Q302...
  • Page 24 37GQ-20FP NO RASTER Fuse Blown Check F701 Normal Check Voltage on C705 Replace Fuse (Approx. 325V DC) Fuse Blown Normal again Check Voltage on C711 Check IC701 Approx. 0V Abnormal (Approx. 105V DC) Normal Normal Check D708, D717 Check CRT connector K1...
  • Page 25 37GQ-20FP NO VERTICAL SCAN Is IC501 bias normal? Check R510, Q501, Check D709, D710, IC501 Q502, Q503 NEITHER VERTICAL NOR HORIZONTAL SYNCHRONIZATION Check IC801, C815, C816, R818 DEFECTIVE VERTICAL AMP. AND VERTICAL LINEARITY Readjust Vertical Size. Vertical size is abnormal...
  • Page 26 37GQ-20FP NO SPECIFIC COLOUR some colour produced in B/W Broadcast reception? Check IC801, C812, C813, R813, X801 the white balance properly adjusted? The Picture Colour is The Picture Colour is The Picture Colour is Red or cyan. green or magenta.
  • Page 27 37GQ-20FP NOTES:...
  • Page 28 37GQ-20FP RECICLED PAPER PRINTED BY:...

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