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37GQ-20H

SERVICE MANUAL

SHARP CORPORATION

CONTENTS

PAL SYSTEM COLOUR TELEVISION

SEJB37GQ20H02

SQUAD

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

37GQ-20H

Issued: 9th June ‘00

This document has been published to
be used for after sales service only.

ELECTRICAL SPECIFICATION.......................2

IMPORTANT SERVICE NOTES.......................3
SERVICE ADJUSTEMENTS.............................4
PRINTED WIRING BOARDS...........................11

SCHEMATIC DIAGRAM, WAVE FORMS..... .13

PART LIST.......................................................18

TROUBLESHOOTING TABLES......................22

Содержание 37GQ-20H

Страница 1: ...es the set should restored to its original condition and only parts identical to those specified should be used MODEL 37GQ 20H Issued 9th June 00 This document has been published to be used for after sales service only ELECTRICAL SPECIFICATION 2 IMPORTANT SERVICE NOTES 3 SERVICE ADJUSTEMENTS 4 PRINTED WIRING BOARDS 11 SCHEMATIC DIAGRAM WAVE FORMS 13 PART LIST 18 TROUBLESHOOTING TABLES 22 ...

Страница 2: ...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 ...

Страница 3: ...ERT POS VERT AM Displayed on screen Hexadecimal Decim Range Function 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 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 Re...

Страница 4: ...on can be made by pressing button NVM LIST DESCRIPTION BANK ADDRESS DESCRIPTION VALUE 00H 00H ZONE FOR TUNNING INFORMATION BEGIN CAH 3BH ZONE FOR TUNNING INFORMATION END 10H 3CH STAND BY 44H ON 40H OFF 44H 3DH 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...

Страница 5: ...NE CHIP REGISTER 1E 00H 1FH ONE CHIP REGISTER 1F 00H 20H VPOS_50 VERTICAL POSITION 4 3 50 Hz 12H 21H VAMP_50 VERTICAL AMPLITUDE 4 3 50 Hz 0FH 22H VPOS_60 VERTICAL POSITION 4 3 60 Hz 0FH 23H VAMP_60 VERTICAL AMPLITUDE 4 3 60 Hz 0FH 24H HSHIFT_60 HORIZONTAL SHIFT 60Hz 1DH 25H HSHIFT_50 HORIZONTAL SHIFT 50Hz 22H 26H FINVFH STEP FOR FINE TUNING IN VHF BAND 00H 27H VHF1_STEP THICK TUNING STEP FOR VHF1 ...

Страница 6: ...STER 12 00H 13H ONE CHIP REGISTER 13 20H 14H ONE CHIP REGISTER 14 20H 15H ONE CHIP REGISTER 15 00H 16H ONE CHIP REGISTER 16 1FH 17H ONE CHIP REGISTER 17 20H 18H ONE CHIP REGISTER 18 2BH 19H ONE CHIP REGISTER 19 00H 1AH ONE CHIP REGISTER 1A 90H 1BH ONE CHIP REGISTER 1B 90H 1CH ONE CHIP REGISTER 1C 90H 1DH ONE CHIP REGISTER 1D 00H 1EH ONE CHIP REGISTER 1E 00H 1FH ONE CHIP REGISTER 1F 00H 20H VPOS_50...

Страница 7: ...HIP REGISTER 09 99H 0AH ONE CHIP REGISTER 0A 32H 0BH ONE CHIP REGISTER 0B B2H 0CH ONE CHIP REGISTER 0C 32H 0DH ONE CHIP REGISTER 0D 20H 0EH ONE CHIP REGISTER 0E 20H 0FH ONE CHIP REGISTER 0F 18H 10H ONE CHIP REGISTER 10 1FH 11H ONE CHIP REGISTER 11 00H 12H ONE CHIP REGISTER 12 00H 13H ONE CHIP REGISTER 13 20H 14H ONE CHIP REGISTER 14 20H 15H ONE CHIP REGISTER 15 00H 16H ONE CHIP REGISTER 16 1FH 17H...

Страница 8: ...level between 60 and 80 dBµV 2 Apply High Voltage Probe to Pin 8 of CRT socket 3 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 2BH BG_COARSE THICK TUNING ADJUSTMENT FOR L AND BG 0AH 2CH BG_FINE FINE TUNING ADJUSTMENT FOR L AND BG 00H 2DH LP_FINE FINE TUNING ADJUSTMENT FOR L 00H 2EH DELAY SEARCH XXXX...

Страница 9: ...lourmeter in the the left point of Fig 4 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 0 284 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...

Страница 10: ...11 37GQ 20H ...

Страница 11: ...12 37GQ 20H ...

Страница 12: ...µs 200V VERT CH1 FREQ 100KHz CH1 P P 504 V CH1 100V A 2µs 100V VERT CH1 FREQ 100KHz CH1 P P 472 V CH1 2V A 10µs 1 00V VERT CH1 FREQ 15 6KHz CH1 P P 8 56 V CH1 200V A 10µs 200V VERT CH1 FREQ 15 6KHz CH1 P P 1 00 kV CH1 1V A 10µs 1 00V VERT CH1 FREQ 15 6KHz CH1 P P 5 40 V CH1 1V A 5ms 2 50 V VERT THE AREA ENCLOSED BY THIS LINE IS DIRECTLY CONNECTED WITH AC MAINS VOLTAGE WHEN SERVICING THE AREA CONNE...

Страница 13: ...2W R862 15K 2W 7 R899 0 8 R887 2K7 1 2W Q885 TX0180BM C701 470nF 275V FZ0160BM C871 470pF 6 R892 1K C876 4 7nF 2KV R864 15K 2W D811 DX0551 D862 DX0551 A N0304CE R893 1K R881 470 C861 470pF D861 DX0551 4 Q883 TX0180BM C872 470pF L3 QTIPM0017CEFM R898 0 S701 P0588 C873 470pF Q871 TX0181 BF422 3 D860 DX0551 Q887 TX0180BM K QCNW 2835BMZZ D812 DX0551 C878 10uF 200V C715 100nF Q702 TX0218 BC337 40 R710 ...

Страница 14: ...7 180K C503 330nF Q505 2SA1037 VS VS _ IC501 UA741 8 7 6 5 4 3 2 1 220nF R519 8K2 R617 1K Q502 BC635 D503 1N4933 C717 10uF 16V R603 330 1 2W R609 2 2 1 2W Q603 TX0112 BC636 R605 6 8 1 2W Q602 BC635 TX0108BM R523 560 R536 4K7 R516 1K D605 DX0504 1N4934 R613 15K C606 22nF R706 680 R710 220 1 2W C607 100uF 35V C722 10uF 16V R722 120 C610 22nF D607 EX0549BM 7V5 R510 1 1 2W R533 120K Q509 2SA1037 R535 ...

Страница 15: ...6 CVBSIN2 28 BS 29 BEXT 30 GEXT 31 REXT 32 XTAL 53 BTUN 52 HALFCTR 51 FBOSD 50 ROSD 49 FB 33 Y C 34 CHR 35 APR 36 UIN 37 VIN 38 YIN 39 YOUT 40 VOUT 41 UOUT 42 BOUT 43 GOUT 44 ROUT 45 ISENS 46 BOSD 47 GOSD 48 R321 1K R318 15K D301 DX0045BM R312 10K C303 1uF 160V C312 220uF 10V C315 100pF Q503 TX0108BM BC635 R824 75 R825 75 R826 75 Q1003 2SA1037KQ C1015 330nF R1034 150K R1033 4K7 C1014 10uF 16V C101...

Страница 16: ...2uF C408 47uF 16V D401 7 5V D402 7 5V Q401 2SC2412 SC401 CZ2107BM 21 F N0505CE C201 33pF L201 390mH R529 150 1 2W D404 7 5V D405 7 5V D406 7 5V D407 7 5V C205 1uF C815 2 2uF C508 330nF C208 1uF C207 10uF 16V R416 47 R407 75 TQ R401 75 TQ R219 2K2 R220 100 L202 12uH DF R221 0 R202 1K C221 100pF Q204 2SC2412 R814 1M IC801 S T V 2 2 3 6 IFPLL 17 GND IF 18 AM FMOUT 19 VCC 20 CVBS 21 AUDIN 22 IF1 23 IF...

Страница 17: ...DIODE TZMC7V5 TFK SMD S AA D 0402 RH EX0549BMZZ ZENER DIODE TZMC7V5 TFK SMD S AA D 0403 RH EX0546BMZZ ZENER DIODE TZMC5V6 TFK SMD S AA D 0404 RH EX0549BMZZ ZENER DIODE TZMC7V5 TFK SMD S AA D 0405 RH EX0549BMZZ ZENER DIODE TZMC7V5 TFK SMD S AA D 0406 RH EX0549BMZZ ZENER DIODE TZMC7V5 TFK SMD S AA D 0407 RH EX0549BMZZ ZENER DIODE TZMC7V5 TFK SMD S AA D 0409 RH EX0549BMZZ ZENER DIODE TZMC7V5 TFK SMD ...

Страница 18: ...125SMD S AA REF No PARTS DESCRIPTION CODE C 0709 RC KZ0160BMZZ CERAM C 2 2NF 4KV X1Y1 S AC C 0710 VCEAGA1EW227M ELEC C 220UF 20 25V S AA C 0711 VCEAGH2CW107M ELEC C 100MF 20 160V S AE C 0712 VCEAGA1CW227M ELEC C 220UF 20 16V S AA C 0713 VCEAGA1CW227M ELEC C 220UF 20 16V S AA C 0714 VCEAGA1AW477M ELEC C 470UF 20 10V S AA C 0715 VCKYTV1HF104Z CERAM C 100NF 50V 2125SMD S AA C 0717 VCEAGA1CW106M ELEC ...

Страница 19: ... SMD S AA R 0705 VRS TQ2BD331F OX RE 330 OHM 1 1 8W SMD S AA REF No PARTS DESCRIPTION CODE R 0706 VRS TV1JD681J 2125 680 OHM 5 1 10W SMD S AA R 0707 VRC UA2HG825K SOLID R 8 2MOHM 10 1 2W S AB R 0708 VRC UA2HG825K SOLID R 8 2MOHM 10 1 2W S AB R 0710 VRD RA2HD221J RES 220 OHM 5 1 2W S AA R 0711 VRS TV1JD220J 2125 22 OHM 5 1 10W SMD S AA R 0714 VRD RA2HD821J RES 820 OHM 5 1 2W S AA R 0715 VRS TV1JD10...

Страница 20: ... S AB DIODES D 0811 RH DX0551BMZZ DIODE LL4148 TFK SMD S AA D 0812 RH DX0551BMZZ DIODE LL4148 TFK SMD S AA D 0860 RH DX0551BMZZ DIODE LL4148 TFK SMD S AA D 0861 RH DX0551BMZZ DIODE LL4148 TFK SMD S AA D 0862 RH DX0551BMZZ DIODE LL4148 TFK SMD S AA COILS L 0861 VP CF120K0000 PEAK COIL 12UH 10 S AC CAPACITORS C 0860 VCCCTV1HH471J CERAM C 470PF 50V 2125SMD S AA C 0861 VCCCTV1HH471J CERAM C 470PF 50V ...

Страница 21: ...Q1001 IC1001 IC1003 Check the tuner supply and band biases Both must be approx 5V DC Normal YES Is tuning voltage normal at Pin 2 of Tuner Check Picture setting by R C Signal should be received Check the AGC Voltage Pin 1 of Tuner Check the SAW Filter SF201 ...

Страница 22: ...setting by R C Signal should be received NO YES Check D707 C710 NO Is Audio Amplifier muted Check R304 Q301 Q302 NO Check IC801 C301 YES YES Check IC1001 Q305 Does Sound Signal appear at Pin 6 of IC801 Does approx 20V DC appear on C710 ...

Страница 23: ... IC701 Normal Abnormal Check Q601 C711 Check D708 D717 Normal Check R705 R706 R715 D706 Normal Check CRT connector K1 K5 bias Normal Abnormal Check C878 Check IC801 Check Q601 C711 Check Voltage on C705 Approx 325V DC Check D701 D702 D703 D704 C705 Check Voltage on C711 Approx 105V DC Approx 0V ...

Страница 24: ...RTICAL AMP AND VERTICAL LINEARITY Readjust Vertical Size Check D505 D506 Check Q505 Q507 Q509 NEITHER VERTICAL NOR HORIZONTAL SYNCHRONIZATION Check IC801 C815 C816 R818 Vertical size is abnormal Vertical linearity is abnormal Is IC501 bias normal Check R510 Q501 Q502 Q503 ...

Страница 25: ...ite Balance The Picture Colour is Blue or Yellow The Picture Colour is green or magenta The Picture Colour is Red or cyan 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 ...

Страница 26: ...27 37GQ 20H NOTES ...

Страница 27: ...22 37GQ 20FP RECICLED PAPER PRINTED BY ON ...

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