Sharp 37GQ-20FP, Service Manual

Page 1: ...tries the set should restored to its original condition and only parts identical to those specified should be used MODEL 37GQ 20FP 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 ...

Page 2: ...his receiver is partially live Alwais use an isolation transformer when servicing this chassis To prevent electric shock do not remove cover No user serviceable parts inside Refer servicing to qualified service personnel Convergence Self Converging System Focus Bi Potencial Electrostatic Sweep Deflection Magnetic Specifictions are subject to change without prior notice Sound Carrier Trap L 40 4MHz...

Page 3: ...ecautions 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 Alwayscheckthehighvoltageifthereisanypossibilitythatitmighthav...

Page 4: ...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...

Page 5: ...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...

Page 6: ...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 ...

Page 7: ...EGISTER 12 00H 13H ONE CHIP REGISTER 13 38H 14H ONE CHIP REGISTER 14 20H 15H ONE CHIP REGISTER 15 00H 16H ONE CHIP REGISTER 16 1DH 17H ONE CHIP REGISTER 17 0FH 18H ONE CHIP REGISTER 18 2FH 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...

Page 8: ...E CHIP REGISTER 09 99H 0AH ONE CHIP REGISTER 0A 3CH 0BH ONE CHIP REGISTER 0B B2H 0CH ONE CHIP REGISTER 0C 2EH 0DH ONE CHIP REGISTER 0D 24H 0EH ONE CHIP REGISTER 0E 22H 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 38H 14H ONE CHIP REGISTER 14 20H 15H ONE CHIP REGISTER 15 00H 16H ONE CHIP REGISTER 16 1DH ...

Page 9: ...again setting is now memorized 5 5 G2 Adjustment Apply mains voltage of 220V AC 50HZ to TV 1 Receive cross hatch pattern signal to a 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 FO...

Page 10: ...olourmeter 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 b...

Page 11: ...E Q603 B L601 R606 R402 C215 J68 J64 C801 J55 C805 C820 C207 RMC001 S1004 S1003 S1002 S1001 K D1001 C1009 J6 J43 J44 K7287BM F7287BMN1 F7288BMN1 ESPA A R608 J32 C301 A C406 X801 D202 D602 J45 J47 J53 L602 C401 1 H 4 C604 C605 J73 R714 C702 D702 PR701 C704 R406 J65 C703 D701 D703 A 3 2 1 R612 R617 C601 C609 R616 C608 TP601 TP602 R611 C713 D710 E Q887 B E Q872 B R883 G2 C876 B Q883 E R885 1 H 4 SH S...

Page 12: ...8 J64 C203 J56 C210 C202 R204 C801 J55 C201 L201 C805 C820 C802 C206 RMC001 S1004 S1003 S1002 S1001 K D1001 C1009 J6 IC1001 R1016 R1017 R1002 R1001 J43 J44 C715 C207 SF201 R608 J32 C301 F7287BMN1 F7288BMN1 A A C406 D401 K R512 R513 L1002 C1003 C1002 R802 R801 R803 J54 C809 X801 C219 R216 R218 C220 C218 R217 Q203 R215 R207 R206 R214 C204 L205 R210 D202 Q202 Q201 R209 R208 L204 R205 C217 D602 J45 J4...

Page 13: ...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...

Page 14: ...R883 2K7 1 2W L861 12uH C860 470pF R866 15K 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 N0561 D812 DX0551 C878 10uF 200V C...

Page 15: ...0 1 2W C503 330nF Q505 2SA1037 R525 120 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 TQ R710 220 1 2W FB701 BLN 0020 C722 10uF 16V R722 120 C610 22nF HB D607 EX0549BM 7V5 R510 1 1 2W Q509 2SA1037 ...

Page 16: ...04 PST529 2 2 1 1 3 3 R303 33K C1008 47nF Q305 2SC2412 R221 R222 220K R321 1K R318 15K D301 DX0045BM R312 10K C303 1uF 160V C312 220uF 10V C315 100pF Q503 TX0108BM BC635 R823 1K R824 75 R825 75 R826 75 C1010 100nF R1023 4K7 R1002 100 R807 1K R806 1K R1018 10K R1024 4K7 R1003 100 R1025 4K7 R1004 100 R1005 100 R1006 100 L1002 68uH X1001 8MHz R315 10K R1026 0 R1008 3K3 C1004 15pF R1021 4K7 R1001 100 ...

Page 17: ...06 C7V5 D407 C7V5 C205 1uF C508 330nF R416 47 R407 75 TQ R401 75 TQ R221 0 R202 1K Q204 2SC2412 R814 1M R402 68 1 2W R420 0 R418 0 R417 2 2uH C409 1nF D409 EX0549BM 7V5 D410 EX549BM 7V5 R1030 100 R1031 100 Q503 TX0108BM BC635 C204 1nF R206 6K8 C217 100nF L205 1uH R214 3K3 R215 560 C218 1nF C219 1nF Q203 TX0116 BF570 R218 1K R216 47 C220 10nF SF201 K3953M 5 4 3 1 2 SF202 K9650M 2 1 5 4 3 R205 2K2 D...

Page 18: ... DX0560BMZZ DIODE BA482 PHILIPS S AB D 0301 RH DX0045BMZZ DIODE 1N4148 S AA D 0401 RH EX0549BMZZ ZENER 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 ...

Page 19: ...F No PARTS DESCRIPTION CODE C 0610 VCKYTV1HB223K CERAM C 22NF 50V 2125SMD S AA C 0701 RC FZ0160BMZZ CAP B1133 D1474 M SIEMENS S AF C 0702 RC KZ0029CEZZ CERAM C 10NF 80 20 250V S AC C 0703 RC KZ0029CEZZ CERAM C 10NF 80 20 250V S AC C 0704 RC KZ0029CEZZ CERAM C 10NF 80 20 250V S AC C 0705 RC EZ0140BMZZ ELEC C 47UF 400V TROBO S AK C 0707 VCEAGA1CW106M ELEC C 10UF 20 16V S AA C 0708 VCKYTV1HB153K CERA...

Page 20: ... 5 1 2W S AA R 0604 VRD RA2HD471J RES 470 OHM 5 1 2W S AA R 0605 VRD RA2HD6R8J RES 6 8 OHM 5 1 2W S AA REF No PARTS DESCRIPTION CODE R 0606 VRD RA2HD6R8J RES 6 8 OHM 5 1 2W S AA R 0607 RR XZ0200BMZZ FUS RES 1R0 TAP 5 1 2W S AB R 0608 VRD RA2BE183J RES 18KOHM 5 1 8W S AA R 0609 VRD RA2HD2R2J RES 2 2 OHM 5 1 2W S AA R 0610 VRD RA2HD270J RES 27 OHM 5 1 2W S AA R 0611 VRD RA2HD270J RES 27 OHM 5 1 2W S...

Page 21: ...GEZZ TACTILE SWITCH S AA S 1002 QSW K0079GEZZ TACTILE SWITCH S AA S 1003 QSW K0079GEZZ TACTILE SWITCH S AA S 1004 QSW K0079GEZZ TACTILE SWITCH S AA SC 0401 QSOCZ2107BMZZ SOCKET S AE PWB B SOCKET UNIT TRANSISTORS Q 0870 RH TX0181BMZZ TRT BF422 TOSHIBA S AC Q 0871 RH TX0181BMZZ TRT BF422 TOSHIBA S AC Q 0872 RH TX0181BMZZ TRT BF422 TOSHIBA S AC Q 0883 RH TX0180BMZZ TRT BF421 TOSHIBA S AB Q 0885 RH TX...

Page 22: ...ck 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 TROUBLESHOOTING TABLES ...

Page 23: ...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 ...

Page 24: ... 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 ...

Page 25: ...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 ...

Page 26: ...hite 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 ...

Page 27: ...27 37GQ 20FP NOTES ...

Page 28: ...22 37GQ 20FP RECICLED PAPER PRINTED BY ON ...