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Sharp 37GT-25S Service Manual

Pal system colour television
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ELECTRICAL SPECIFICATION........................3
IMPORTANT SERVICING NOTES....................4
SERVICE ADJUSTMENTS................................5
PRINTED WIRING BOARDS...........................12
PARTS ALLOCATION TABLES.......................16

SHARP CORPORATION

SERVICE MANUAL

PAL SYSTEM COLOUR TELEVISION
37GT-25S
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
BLOCK DIAGRAM...........................................26
TROUBLESHOOTING TABLES......................28
PART LIST.......................................................30
1
37GT-25S
SEJB37GT25S00
Issued: 31st Oct. '00
GA-1
CHASSIS
This document has been published to
be used for after sales service only.

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Summary of Contents for Sharp 37GT-25S

  • Page 1: Table Of Contents

    37GT-25S SERVICE MANUAL SEJB37GT25S00 Issued: 31st Oct. ‘00 GA-1 CHASSIS PAL SYSTEM COLOUR TELEVISION 37GT-25S 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 37GT-25S SERVICE MANUAL UPDATE LOG SHEET Application Technical Report # Cause / Solution Part # Page # Technical Bulletin # Data /Serial # Use this page to keep any special servicing information as Thecnical Report (Bulletin), Technical Information, etc. If only part number changes are required, just change part number directly on Part List Section.

  • Page 3: Electrical Specification

    37GT-25S ELECTRICAL SPECIFICATIONS ......33.4MHz •Sound Carrier Trap •Power Input .......220V-240 Volts AC 50Hz •Power Consumption Normal Operation........34W •Adjacent Sound Carrier Trap ....40.4MHz Stand-by Operation........7.0W •Audio Power Output Rating .....2W (MPO) ....31.9MHz •Adjacent Picture Carrier Trap Ω Speaker......32 2W, 8cm Round, 1pc Convergence......Self Converging System...

  • Page 4: Important Servicing Notes

    37GT-25S IMPORTANT SERVICING NOTES Only qualified service personnel are allowed to carry out mintenance and repair of this receiver. SERVICING OF HIGH VOLTAGE SYSTEM AND CRT It is important that the static charge is removed from the high voltage system when carrying out work on the receiver.

  • Page 5: Service Adjustments

    37GT-25S SERVICE ADJUSTMENT •SERVICE MODE FUNCTION 1. Connect a test pattern to the antenna terminal. 2. Tune the receiver to this signal. 3. Turn the receiver off using the mains switch. 4. Press the volume down and channel up buttons on the front of the receiver at the same time.
  • Page 6 37GT-25S Adjustment of Data within the NVM memory To access the NVM memory, press the channel up button on the remote control until the NVM setting is reached. Note that the NVM address is shown in green and the NVM value is shown in red.
  • Page 7 37GT-25S PAGE ADDRESS DESCRIPTION VALUE S_CORR2: S-CORRECTION E_CAG2: CAG ADJUSTEMENT VALUE EA_OPT2: TV OPTIONS 0: FP: SYSTEM B/G (0)- B/G+L, MESSAGE RECHERCHE 1: AV FRONTAL: NOT INCLUDED(0), INCLUDED(1) 2: TUNING LOCK (HOTEL): LOCKED+SWITCH-ON PR1(1) NO LOCKED (0) 3: UHF-ONLY: BAND UHF(1) ALL BANDS(0)
  • Page 8 37GT-25S PAGE ADDRESS DESCRIPTION VALUE N_HUE: HUE CORRECTION CONT2: CONTRAST COLOR2: COLOR SATURATION BRIGHT: BRIGHTNESS LUPK2: 0,0,0,0,0,P2,P1,P3 LUMA PEAKING VALUE LUPK DK_OPTION: OPTION FOR DK SYSTEM [X X X X X X X DK_S] HCR1_NVM: END OF HORIZONTAL CLAMP PULSE...
  • Page 9 37GT-25S PAGE ADDRESS DESCRIPTION VALUE PAGE MEMORY FOR LIST MODE PROGRAM 1 PAGE MEMORY FOR LIST MODE PROGRAM 2 PAGE MEMORY FOR LIST MODE PROGRAM 3 PAGE MEMORY FOR LIST MODE PROGRAM 4 PAGE MEMORY FOR LIST MODE PROGRAM 5...
  • Page 10 37GT-25S • • • • • PIF/AGC Adjustment • • • • • Screen Adjustment 1. AFT Adjustment 3. Focus Adjustment AFT must be adjusted to a fixed value of 40. Apply mains voltage of 220V AC/50HZ to TV. Receive Philips pattern signal to a level between 60 and 80 dBµV.
  • Page 11 37GT-25S •COLOUR ADJUSTMENT PROCEDURES 1. Y-DLY a) Receive Philips pattern signal. ∧ b) When button is pressed, luma phase delays. ∨ c) When button is pressed, chroma phase delays. d) Adjust the chroma-luma delay. 2. «B-GAIN», «G-GAIN», «R-GAIN» a) Adjust G2.

  • Page 12: Printed Wiring Boards

    37GT-25S F 7320NOB PRINTED WIRING BOARD. Components side. S1001 S1002 S1003 S1004 D1021 C1004 RMC1 QKITP7320BMN D1011 F7320BMN0 F7321BM P883 L701 VA701 C702 L702 J816 SC881 J909 L703 J815 R751 T751 R752 K7321BM F701 R753 C874 D719 C719 R703 C753...
  • Page 13 37GT-25S F 7320NOB PRINTED WIRING BOARD. Components side. D1021 L303 C1004 J401. FB301 C403 L401 ITP7320BMN0 J134 J301. B Q3011 R312 F7320BMN0 P301 C309 Q301 C304 F7321BMN0 L304 C301 Q302 J207 P851 Q3021 J410 J106 C878 R305 L881 P883 J148...
  • Page 14 37GT-25S F 7320NOB PRINTED WIRING BOARD. Copper side. J301. J401. D1021 C303 R402 C403 R403 L303 RJ123 C1004 L401 RJ128 FB301 J134 C305 R311 P301 Q3011 R312 F7320BMN0 C304 RJ141 L304 Q301 C309 Q303 P851 R307 Q305 C878 P883 R309...
  • Page 15 37GT-25S F 7320NOB PRINTED WIRING BOARD. Copper side. D1021 1004 RMC1 S1004 S1003 S1002 S1001 D1011 P883 L701 S701 J816 L702 SC881 L703 J815 J909 R751 R752 F7321BMN0 T751 R753 FH1001 FH1002 IC751 D719 R756 R703 D710 C719 RDA1 C753...

  • Page 16: Parts Allocation Tables

    37GT-25S F7320N0B PWB PARTS ALLOCATION TABLES (component side): Ref No Xmm Ref No Xmm Ref No Xmm Ref No Xmm Ref No Xmm Ref No Xmm (L3) 142748 171831 C422 181737 34798 C804 169037 102489 D507 100076 80264 F701 19304 177927...
  • Page 17 37GT-25S F7320N0B PWB PARTS ALLOCATION TABLES (component side): Ref No Xmm Ref No Xmm Ref No Xmm Ref No Xmm Ref No Xmm Ymm J317 224282 68199 J430 229108 67818 P201 234569 14478 R1049 193548 150241 R707 34544 143510 J318...
  • Page 18 37GT-25S F7320N0B PWB PARTS ALLOCATION TABLES (copper side): Ref No Xmm Ref No Xmm Ref No Xmm Ref No Xmm Ref No Xmm Ref No Xmm C1001 212725 199644 C243 226568 24003 C813 189230 87757 Q201 165481 66929 R1028 221107 169545...
  • Page 19 37GT-25S F7320N0B PWB PARTS ALLOCATION TABLES (copper side): Ref No Xmm Ref No Xmm Ref No Xmm Ref No Xmm Ref No Xmm R361 176657 84328 R615 205232 123063 R879 162814 187325 RJ19 216662 165735 RJ72 143764 43307 R362 201422 42291...

  • Page 20: Solid State Device Base Diagram

    37GT-25S SOLID STATE DEVICE BASE DIAGRAM 33 32 33 32 33 32 33 32 RH-IX1812BMZZ RH-TX0185BMZZ RH-IX1818BMZZ 33 32 33 32 VHIPC123ZY-1 RH-IX0037CEZZ VSIMT1A/A//-1* 33 32 RH-TX0142BMZZ RH-TX0108BMZZ RH-TX0216BMZZ RH-TX0112BMZZ RH-TX0132BMZZ RH-TX0217BMZZ RH-TX0131BMZZ RH-TX0218BMZZ RH-TX0181BMZZ RH-TX0180BMZZ 33 32 RH-TX0113BMZZ VS2SA1037KQ-1...

  • Page 21: Schematic Diagram, Wave Forms

    37GT-25S 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 22 37GT-25S Page 24 SCHEMATIC DIAGRAM (00 Version).
  • Page 23 37GT-25S Page 25 SCHEMATIC DIAGRAM (00 Version).
  • Page 24 37GT-25S SCHEMATIC DIAGRAM (01 Version).
  • Page 25 37GT-25S SCHEMATIC DIAGRAM (01 Version).

  • Page 26: Block Diagram

    37GT-25S BLOCK DIAGRAM 37GT25H S1001 S1002 S1003 S1004 VOL+ VOL- AC 220-240V 50HZ IC1002 P701 N0304CE F701 T3.15A +150V SC881 VD842CE 150V Q883 H.V. S 7 0 1 Q885 HEATER IC1001 Q887 L701 A D G C O I L...
  • Page 27 37GT-25S BLOCK DIAGRAM RMC0001 RMCU0222CE J 3 0 1 D 1 0 2 1 S P 3 0 1 Q 1 0 0 3 X1001 P 3 0 1 6 MHZ 3 . 3 V Audio Q305 Mute Q901 X801 4.43MHZ...

  • Page 28: Troubleshooting Tables

    37GT-25S TROUBLESHOOTING TABLES. NO FUNCTION(NO SOUND AND NO PICTURE) Is D1011 Not light (LED) on a light? Yes, red Check F701, R703 and Broken Q701 Check Q711 Approx. 0 V emitter Check Q701, voltage D718, C718 Normal Q601 Check R737, D713,Q704, Approx.
  • Page 29 37GT-25S TROUBLESHOOTING TABLES. NO PICTURE Check Open R609 Change R609 Normal Check C867 voltage Check C876, T601 and connection G2 Normal Check CRT NO SOUND Check sound setting by R/C. Signal should be received. Check colector of Q301 volta Check R313, Q301 and Q302 Approx.

  • Page 30: Part List

    IC TDA8840-2Y PHILIPS S AN IC 0501 VSIMT1A/A//-1 TRT IMT1A-T110 ROHM S AA IC 0701 VHIPC123ZY1-1 PHOTO COUPLER PC123ZY1 SHARP S AA IC 1001 RH-IX1818BMZZ IC SDA5552A002 TV TEXT PRO 1PAGE 64KB S -- Check Q500, IC 1002 RH-IX1812BMZZ EEPROM M24C04-WMN6T ST MICROE.
  • Page 31 37GT-25S REF No. PARTS DESCRIPTION REF No. PARTS DESCRIPTION SN CODE EX CODE SN CODE EX CODE Q 0704 VS2SC2412KQ-1 TRT 2SC2412 ROHM S AA D 0717 RH-EX0495BMZZ ZENER DIODE BZX79 B75V 2% S AA Q 0705 RH-TX0142BMZZ TRT TBC 547-B TOSHIBA...
  • Page 32 37GT-25S REF No. PARTS DESCRIPTION REF No. PARTS DESCRIPTION SN CODE EX CODE SN CODE EX CODE C 0706 RC-EZ0115BMZZ ELEC C 68UF 400V S AF C 0234 VCEAGA1HW225M ELEC C 2,2UF 20% 50V S AA C 0707 RC-FZ4153BMNJ POL FILM C 15nF 50V 5% ECQ-B PANASONI S AA...
  • Page 33 37GT-25S REF No. PARTS DESCRIPTION REF No. PARTS DESCRIPTION SN CODE EX CODE SN CODE EX CODE R 0203 VRS-TV1JD561J 2125 560 OHM 5% 1/10W SMD S AA R 0434 VRS-TV1JD102J 2125 1KOHM 5% 1/10W SMD S AA R 0204...
  • Page 34 37GT-25S REF No. PARTS DESCRIPTION REF No. PARTS DESCRIPTION SN CODE EX CODE SN CODE EX CODE R 0718 VRS-TV1JD333J 2125 33KOHM 5% 1/10W SMD S AA R 1056 VRS-TV1JD103J 2125 10KOHM 5% 1/10W SMD S AA R 0720 VRD-RA2BE223J...
  • Page 35 CABINET PARTS QKITP7320BMN0 PWB CHASSIS GA-1 1/1 S AF CCABA1258BMV0 CABINET SET 7FM11FP S AL QSOCZ2107BMZZ SOCKET S AF HBDGB1018BMSB SILVER SHARP BADGE S AA CRDAR5510BMV6 RADIATOR SET POWER S -- HDECQ0049BMSA DECORATION R/C S AA HDECQ0048BMSA DECORATION LED S AA...
  • Page 36 37GQ-20FP RECICLED PAPER PRINTED BY:...

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