Service manual

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37GT-25S

SERVICE MANUAL

SHARP CORPORATION

PAL SYSTEM COLOUR TELEVISION

SEJB37GT25S00

GA-1 CHASSIS

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.

MODEL 37GT-25S

Issued: 31st Oct. ‘00

This document has been published to

be used for after sales service only.

ELECTRICAL SPECIFICATION........................3

IMPORTANT SERVICING NOTES....................4

SERVICE ADJUSTMENTS................................5

PRINTED WIRING BOARDS...........................12

SOLID STATE DEVICE BASE DIAGRAM.......20

SCHEMATIC DIAGRAM, WAVE FORMS........21

TROUBLESHOOTING TABLES......................28

PARTS ALLOCATION TABLES.......................16 PART LIST.......................................................30

BLOCK DIAGRAM...........................................26

CONTENTS

Summary of content (36 pages)

PAGE 1
37GT-25S SERVICE MANUAL SEJB37GT25S00 Issued: 31st Oct. ‘00 GA-1 CHASSIS PAL SYSTEM COLOUR TELEVISION MODEL 37GT-25S 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........................3 IMPORTANT SERVICING NOTES....................4 SERVICE ADJUSTMENTS................................5 PRINTED WIRING BOARDS................
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37GT-25S SERVICE MANUAL UPDATE LOG SHEET Technical Report # Technical Bulletin # Cause / Solution Part # Page # Application 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. If you need more information, please refer to the Technical Report (Bulletin).
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7GT-25S ELECTRICAL SPECIFICATIONS •Sound Carrier Trap.............................33.4MHz •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) •Adjacent Picture Carrier Trap...............31.9MHz Speaker............................
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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. This can be achieved by connecting a 10K resistor (with a suitably insulated lead) from the CRT cavity connector to the CRT ground tag. This must be carried out with the AC supply disconnected from the reciver.
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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. 5. Keeping these buttons pressed, turn the mains on. 6. When the set starts up it will be in service mode. 7. Release the two buttons. • • • • Use the channel up and down buttons to move between the options.
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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. Each of the NVM values are stored as a hexadecimal code, each code comprises of two hexadecimal numbers. Each of these numbers will break down into a four bit binary code as in the example below.
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37GT-25S PAGE 0 ADDRESS 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A DESCRIPTION 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) 4: PAL ONLY(1), PAL+ SECAM(0) 5: CHILD LOCK: CHILD LOCK ACTIVE(1) CHILD LOCK NO ACT(0) 6: AUTO FIRST: TUN
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37GT-25S PAGE 0 ADDRESS 3B 3C 3D 3E 3F 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 1 57 58 59 5A 5B 5C 5D 5E 5F 60 61∼ FF 00 ∼ 9F A0 A1 A2 A3 A4 A5 DESCRIPTION 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 OSD_WORD: OSD STATUS (1=RT/0=OT,1=NO WHITE BARS IN MENU CLOCK-D.C.-,PIN OPTION,R830-D.C.
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37GT-25S PAGE 1 ADDRESS A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF D0 ∼ FF DESCRIPTION VALUE 10 02 00 30 04 00 10 02 00 30 04 00 10 02 00 30 04 00 10 02 00 30 04 00 10 02 00 30 04 00 10 02 00 30 04 00 10 02 00 30 04 00 FF 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 MEMORY FOR LI
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37GT-25S •PIF/AGC Adjustment •Screen Adjustment 1. AFT Adjustment 3. Focus Adjustment AFT must be adjusted to a fixed value of 40. 1. Apply mains voltage of 220V AC/50HZ to TV. 2. Receive Philips pattern signal to a level between 60 and 80 dBµV. 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 Cut-In Adjustment (I2C BUS) 4. G2 Adjustment 1 . Receive the «COLOUR BAR» signal (Channel E- 1.
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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. b) Tune a white pattern c) Adjust colour to minimum. d) Position colourmeter in the center of screen. e) Using brightness and contrast buttons, select a luminance of ≈120 nits.
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37GT-25S F 7320NOB PRINTED WIRING BOARD. Components side. 25 S1001 24 S1002 S1003 S1004 D1021 C1004 K + RMC1 QKITP7320BMN D1011 23 F7320BMN0 B P883 L701 VA701 C702 (G) L702 J816 J435 9 1 P702 J910 21 9 10 11 8 7 2 F701 6 J815 5 3 R751 T751 D702 D701 T3.15AL T3.
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37GT-25S F 7320NOB PRINTED WIRING BOARD. Components side. 25 DIP C1004 L303 24 + B (K) P882 5 Q871 Q870 J149 B D811 D723 J150 D503 J201 D601 IC1001 R1063 R1033 R1048 SF203 D207 D510 J806 SF201 C508 C249 J316 CF302 1 1 D202 J324 D210 J317 C225 D203 33V J141 4 TU201 C401 C410 R429 R366 A9.
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37GT-25S F 7320NOB PRINTED WIRING BOARD. Copper side. 25 5 J401.
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37GT-25S F 7320NOB PRINTED WIRING BOARD. Copper side.
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37GT-25S F7320N0B PWB PARTS ALLOCATION TABLES (component side): Ref No (L3) (L3). (L4) A1 A1. A2 A5 A6 A7 A7. A8 A8. A9 A9. B1 B1. B2 B3 B3. B4.
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37GT-25S F7320N0B PWB PARTS ALLOCATION TABLES (component side): Ref No J317 J318 J319 J320 J321 J322 J323 J324 J325 J326 J328 J329 J330 J331 J332 J334 J335 J336 J337 J338 J339 J340 J341 J343 J344 J345 J346 J347 J348 J349 J400 J401 J401.
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37GT-25S F7320N0B PWB PARTS ALLOCATION TABLES (copper side): Ref No C1001 C1002 C1003 C1005 C1008 C1009 C1011 C1012 C1013 C1015 C1016 C1023 C1024 C1025 C1026 C1027 C1028 C1029 C1030 C1032 C1033 C1035 C201 C202 C203 C204 C207 C209 C210 C211 C212 C214 C215 C216 C217 C218 C219 C220 C221 C223 C226 C227 C228 C229 C230 C231 C237 C238 C240 C242 Xmm 212725 217424 227838 217297 204851 203200 217170 221361 217551 227711 217551 232156 235585 232156 213614 228219 228346 191770 224536 228219 196469 239268 180340 20142
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37GT-25S F7320N0B PWB PARTS ALLOCATION TABLES (copper side): Ref No R361 R362 R363 R364 R402 R403 R404 R412 R415 R416 R418 R419 R421 R422 R423 R424 R425 R426 R427 R428 R434 R435 R436 R500 R503 R505 R508 R509 R510 R511 R513 R515 R516 R517 R519 R520 R525 R526 R527 R528 R529 R530 R531 R532 R533 R601 R607 R608 R612 R613 Xmm 176657 201422 189738 187198 191516 183261 156210 174244 160274 168021 162560 148336 200279 194310 199136 197104 195199 187325 189230 173355 148717 150495 158242 143002 107569 122555 120015
PAGE 20
K 64 37GT-25S C 1 E K A 6 4 1 3 B C E SOLID STATE DEVICE BASE DIAGRAM A K 33 E 52 B C 32 B C E 33 C 32 27 8 27 52 5 1 8 4 51 5 20 52 1 1 26 4 27 52 52 1 64 27 8 5 RH-IX1812BMZZ RH-IX1818BMZZ 33 1 33 32 27 K E A 6 8 4 1 4 64 5 1 K A 1 6 3 1 B 5 20 1 51 19 4 52 33 32 26 26 27 27 1 8 C E 5 1 3 64 1 51 4 52 1 A E K B C 33 E 1 A 6 C 32 4 K B5 C E B C E A 20 26 K A B C E 6 4 1 3 A 52 B 19 51 1 A K 4 A
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37GT-25S DESCRIPTION OF SCHEMATIC DIAGRAM 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. 5. The capacitor with Part No. RC-FZ4XXXBMNJ is designed to with stand 50V. SAFETY NOTE: 1. DISCONNECT THE AC PLUG FROM THE AC OUTLET BEFORE REPLACING PARTS. 2.
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L704 G0415BM ADG COIL 5 6 7 R704 560K (1/2W) H-TX0217BM Q702 BC337 R707 220. D718 (15V) EX0419BM C726 470pF C706 68 (400V) EZ0115BM D704 DX0571BM D703 DX0571BM R720 22K D701 DX0571BM L702 3,3uH P0144GE R709 D707 C5V6 EX0409BM D706 DX0045BM Q701 H-TX0185BM (3N80A) 1 D705 DX0539BM C705 .01 (250V) KZ0029CE R703 5.6 (5W) (WKP) D702 DX0571BM C718 220P (2KV) KZ0035CE R705 560K (1/2W) C707 .015 (50V) FZ4153BM C708 .068 (50V) S701 P0612CE L701 F0116BM 3 C704 .01 (250V) KZ0029CE .
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-1.6 H OUT C603 .022 (50V) FZ4223BMNJ -7.6 -1.6 Q603 BC547 H-TX0142BM R601 12K R722 8.2M (1/2W) (UA) R721 8.2M (1/2W) (UA) C709 .0033 (50V) FZ4332BMNJ -5.6 -1.7 R606 2.2 (1/2W) -1.5 1.9 C609 .01 R602 330 (1/2W) C604 220 (10V) Q604 BC636 H-TX0112BM L601 4.7uH (CF) 3 -1.5 Q602 BC635 H-TX0108BM +7V IC701 0 C622 220 (10V) R632 470 (1/2W) R616 27 (1W) (VV) C601 .0056 (1.5KV) FZ0144BM C623 470P (SL) D609 DX0577BM Q705 BC547 H-TX0142BM R714 100 D720 (4.
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Page 22 C804 33 (50V) C1032 330nF 6 D602 DX0045BM 7 D603 680 R836 R838 820 R613 100 45 8 PROT D802 DX0045BM FLY BACK H OUT R254 0 R1029 10K VIDEO 4 3 R1028 3K3 1012 20nF 49 50 KEY POW 5 46 47 48 SDA SCL 5V AGC C607 39P 9 43 10 R1037 10K C1026 100pF R1021 22K R1022 10K 42 41 R1008 1K R1072 1M L1004 12uH 11 R612 15K C806 100 (16V) C810 .1(Z) R801 100K C807 .022 Q1003 BF840 H-TX0113BM C1003 100nF +3.
PAGE 25
Page 23 V-B V-A V-OUT R410 82 R408 220 R407 47 (1/2W) FB R C610 .01 R414 82 C420 47 (16V) C613 4700P R418 1K Q401 BC337 H-TX0217BM R513 1K8 D511 (3V6) EX0404BM R404 1K D412 DX0045BM C236 220 (25V) R518 1.8 (1/2W) +8V 15 . R250 82 19 . 18 . 16 . 17 . D603 DX0045BM 14 . G R417 82 C421 47 (16V) R416 1K C412 10nF FB304 R420 82 C422 47 (16V) B . . 64 63 62 61 60 GND VL VERT B VERT A . . . .
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37GT-25S BLOCK DIAGRAM S1004 VOL+ VOL- . . 4 AC 220-240V 50HZ 1 S1003 2 CH- . S1002 CH+ . S1001 I 3 37GT25H . 8 . . 7 6 5 . IC1002 (A) P701 N0304CE F701 T3.15A 1 2 3 +150V H (H) SC881 VD842CE 7 Q885 9 Q887 3 52 H.V. . 51 S701 2 ADG COIL Q872 G 4 3 6 G2 (G) 8 5V SLOW 2 3 4 5 . . 2,5V . FOCUS PR701 PWB-B DUNTK7284BMN2 L703 F T700 16 . 1 2 4 3 . R G B (K) 5V 20V 8 GND . P881A (L2) . . 5 1 L702 1 MUTE .
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37GT-25S BLOCK DIAGRAM RMC0001 RMCU0222CE 2 I J301 1 D1021 2 6 7 5V 3 1 5 4 3 7V OUT 1 . 1 . SP301 2 Q1003 X1001 . 2 . P301 6 MHZ 3.3V H 19 28 27 VCC VH AGC U 18 29 GND RESET 17 30 L/L´ 16 31 VSYNC 15 32 IR 14 33 BG/L 13 H 12 34 V R 11 35 VL G 10 36 ANA GND B 9 37 ANA VCC BLK CVBS 8 ANA VCC 7 38 ANA GND 6 39 GND KEY VCC 5 40 VCC2.5 SDA KEY KEY 4 41 VCC SCL 3 42 GND VT 2 43 FRONT 44 VCC2.
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37GT-25S TROUBLESHOOTING TABLES. NO FUNCTION(NO SOUND AND NO PICTURE) Is D1011 (LED) on a light? Not light Yes, red Broken Check Q701, D718, C718 and Q601 Check F701, R703 and Q701 Check Q711 emitter voltage Approx. 0 V Normal Approx. 3.3 V Check R737, D713,Q704, IC1001 and IC1003. Check D724 Broken Check C206 Voltage Approx. 0 V Check D708, C711 and IC701 Normal Check R204, Q209 and Q500. Approx. 8 V Check Q601, D708 and C711 Check Q709 emitter Voltage Approx.
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37GT-25S TROUBLESHOOTING TABLES. NO PICTURE Check R609 Open Change R609 Normal Check C867 voltage 0V Check C876, T601 and connection G2 Normal Check CRT NO SOUND Check sound setting by R/C. Signal should be received. 0V Check colector of Q301 volta Check R313, Q301 and Q302 Approx. 20V Check L303, IC201 and speaker.
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37GT-25S PART LIST TROUBLESHOOTING TABLES. REPLACEMENT PARTS NO VERTICAL SCAN Are R504 or R608 Broken? Broken 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.
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37GT-25S REF No.
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37GT-25S ! REF No.
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37GT-25S ! REF No.
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37GT-25S ! ! REF No.
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37GT-25S ! ! REF No.
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37GQ-20FP RECICLED PAPER PRINTED BY: 22 ON: