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15

37GQ-20S
37GQ-21S

H.V.

FOCO

G2

1

2

3

4

1

+8V

+8V

+5V B

-10V

SER

J77

+7V

+105

V

+105

V

-10V

+5V A

-25V

+10V

PC3

.

.

C708

15nF

C709

2n2

(4Kv)

C603

220uF

(10V)

C604

220uF

(10V)

D705

DX0551

D706

C6V2 EX0584

R704

100

R705

330

(TQ)

(1%)

R707

8M2

(1/2W)

(UA)

R708

8M2

(1/2W)

(UA)

D711

DX0503

1N4933

D710

DX0504

1N4934

D714

B5V6

Q701 2SC2412

Q703

TX0218

BC337-40

R512

10K

R513

68K

Q501

BC636

R604

470

(1/2W)

R606

6.8

(1/2W)

R607

1

(1/2W)

R610

27

(1/2W)

R611

27

(1/2W)

R612

2.7

(1W)

R615

10

(1/2W)

R616

3K3

(1/2W)

C608

1uF

(160V)

C609

470nF

(250V)

FZ0174BM

Q601

TX0132

BU508D

Q604

2SC2412

L601

4.7uF

(CF)

L602

22uH

(CF)

D601

DX0551

D602

DX0505

1N4935

D604

DX0506

1N4936

D60

DX0

1N4

R614

560

T601

NF2072BM

4

2

5

6

9

11

7

10

3

8

5

6

IC701

TDA16833

GND

1

FB

2

3

3

D

4

D

5

D

6

D

7

D

8

D

9

D

10

D

11

12

12

VCC

13

GND

14

(H)

N0461CE

(F)

N0505CE

R714

820

(1/2W)

R517

180K

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)

C605

100nF

R603

330

(1/2W)

R609

2.2

(1/2W)

Q603

TX0112

BC636

R605

6.8

(1/2W)

Q602

BC635

R523

560

R536

4K7

R516

1K

D605

DX0504

1N4934

R613

15K

C606

22nF

R706

680

(TQ)

R710

220

(1/2W)

C607

100uF

(35V)

FB701

BLN-0020

C722

10uF

(16V)

R722

120

C610

22nF

D607

EX0549BM

7V5

R510

1

(1/2W)

R533

120K

Q509

2SA1037

R535

820K

Q707

TX0217

D718

5V6

R721

22

R720

560

(1/2W)

R718

4K7

R719

2K7

Q706

2SA1037

Q708

2SC2412KQ

D712

6V2

(2%)

R534

1K5

R502

1K

R530

180K

C510

100pF

C724

100pF

C723

100pF

R509

1K

R703

22

R537

15K

C726

2.2uF

R1027

100

R

J67

1uF

Q507

2SC2412KQ

D723

DX0503

D721

DX0504

C713

220uF

(16V)

Q506

2SA1037

220uF

(16V)

14

13

9

10

D603

DX0045

R723

1K

C714

470uF

(10V)

C601

5n6

1K5

R711

22

R608

18K

R538

2K2

C725

2n2

(4Kv)

C602

470pF

2KV

3

4

7

8

Page 17

Page 14

8

9

10

11

12

13

14

I

H

G

F

E

D

C

B

A

Содержание 37GQ-20S

Страница 1: ...in some countries the set should restored to its original condition and only parts identical to those specified should be used 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 23 CONTENTS ...

Страница 2: ... 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 Aerial Input Impedance VHF UHF 75 ohm Unbalanced Tuning Ranges CATV Special Channels B G 48 25...

Страница 3: ...g 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 Alwayscheckthehighvoltageifthereisanypossibilitythatitmigh...

Страница 4: ...OS VERT 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 Gai...

Страница 5: ...ection 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 S...

Страница 6: ...EH ONE 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 V...

Страница 7: ...IP 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 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 ...

Страница 8: ...H ONE CHIP REGISTER 09 A1H 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 ...

Страница 9: ...etween 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 XXXXXXX0 SH...

Страница 10: ...on colourmeter 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 0 300 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 t...

Страница 11: ...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 B Q870 E R864 R305 C308 C307 C302 R304 R3...

Страница 12: ...J68 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 ...

Страница 13: ...V A 2µs 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 ...

Страница 14: ... 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 DX0045 D862 DX0045 A N0304CE R893 1K R881 470 C861 470pF D861 DX0045 4 Q883 TX0180BM C872 470pF L3 QTIPM0017CEFM R898 0 S701 P0588 C873 470pF Q871 TX0181 BF422 3 D860 DX0045 Q887 TX0180BM K N0561 D812 DX0045 C878 10uF 200V C715 ...

Страница 15: ...ND 14 H N0461CE F N0505CE R714 820 1 2W R517 180K 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 C605 100nF R603 330 1 2W R609 2 2 1 2W Q603 TX0112 BC636 R605 6 8 1 2W Q602 BC635 R523 560 R536 4K7 R516 1K D605 DX0504 1N4934 R613 15K C606 22nF R706 680 TQ R710 220 1 2W C607 100uF 35V FB701 BLN 0020 C722 10uF 16V R722 ...

Страница 16: ...DD 39 SCL 38 SDA 37 PC2 36 PC3 35 PC4 34 DA5 1 PB1 2 PB2 3 PB3 4 PB4 5 PB5 6 PB6 7 PA0 8 PA1 9 PA2 10 PA3 11 12 12 PA4 13 PA5 14 PA6 15 PA7 16 VSS 17 R 18 G 19 B 20 BLANK 21 HSYNC 22 PC5 33 PC6 32 PC7 31 VS 30 RESET 29 XTAL 28 XTAL 27 26 26 OSD 25 OSD 24 VSYNC 23 L1002 68uH C1004 15pF C1005 15pF R807 1K R302 4K7 1 2W R823 1K R1021 4K7 R1022 4K7 R1020 5K6 R1019 1K Q1002 2SC2412 C1011 22nF R808 1K S...

Страница 17: ...C401 1uF C404 1nF C405 1nF C406 22uF C408 47uF 16V D401 7 5V D402 7 5V D403 C5V6 Q401 2SC2412 SC401 CZ2107BM 21 F 0505CE C201 22pF L201 390mH R529 150 1 2W D404 7 5V D405 7 5V D406 7 5V D407 7 5V C205 1uF C508 330nF D803 C5V1 SF201 G1968M 5 4 3 1 2 C208 1uF C215 47uF 10V R515 100 C207 10uF 16V R416 47 R407 75 TQ R404 75 TQ R401 75 TQ C224 220nF D808 5V6 D810 6V8 R219 2K2 R220 100 L202 12uH DF R221...

Страница 18: ...MZZ ZENER DIODE TZMC7V5 TFK SMD S AA AA D 0412 RH EX0549BMZZ ZENER DIODE TZMC7V5 TFK SMD S AA AA D 0503 RH DX0503BMZZ DIODE 1N4933 S AB AB D 0505 RH DX0551BMZZ DIODE LL4148 TFK SMD S AA AA D 0506 RH DX0551BMZZ DIODE LL4148 TFK SMD S AA AA D 0601 RH DX0551BMZZ DIODE LL4148 TFK SMD S AA AA D 0602 RH DX0505BMZZ DIODE 1N4935 S AB AE D 0603 RH DX0045BMZZ DIODE 1N4148 S AA AA D 0604 RH DX0506BMZZ DIODE ...

Страница 19: ...No PARTS DESCRIPTION SN CODE EX CODE C 0703 RC KZ0029CEZZ CERAM C 10NF 80 20 250V S AC AC C 0704 RC KZ0029CEZZ CERAM C 10NF 80 20 250V S AC AC C 0705 RC EZ0140BMZZ ELEC C 47UF 400V TROBO S AC AK C 0707 VCEAGA1CW106M ELEC C 10UF 20 16V S AA AA C 0708 VCKYTV1HB153K CERAM C 15NF 50V 2125SMD S AA AA C 0709 RC KZ0160BMZZ CERAM C 2 2NF 4KV X1Y1 S AA AC C 0710 VCEAGA1EW227M ELEC C 220UF 20 25V S AA AA C ...

Страница 20: ...D2R2J RES 2 2 OHM 5 1 2W S AA AA R 0610 VRD RA2HD270J RES 27 OHM 5 1 2W S AA AA REF No PARTS DESCRIPTION SN CODE EX CODE R 0611 VRD RA2HD270J RES 27 OHM 5 1 2W S AA AA R 0612 VRN VV3AB2R7J MET FILM R 2 7 OHM 5 1W S AA AA R 0613 VRD RA2BE153J RES 15KOHM 5 1 8W S AA AA R 0614 VRS TV1JD561J 2125 560 OHM 5 1 10W SMD S AA AA R 0615 RR XZ0212BMZZ FUS RES 10R TAP 5 1 2W S AA AB R 0616 RR XZ0242BMZZ FUS R...

Страница 21: ...ITCH S AA AA S 1004 QSW K0079GEZZ TACTILE SWITCH S AA AA SC 0401 QSOCZ2107BMZZ SOCKET S AF AE PWB B SOCKET UNIT TRANSISTORS Q 0870 RH TX0181BMZZ TRT BF422 TOSHIBA S AA AC Q 0871 RH TX0181BMZZ TRT BF422 TOSHIBA S AA AC Q 0872 RH TX0181BMZZ TRT BF422 TOSHIBA S AA AC Q 0883 RH TX0180BMZZ TRT BF421 TOSHIBA S AA AB Q 0885 RH TX0180BMZZ TRT BF421 TOSHIBA S AA AB Q 0887 RH TX0180BMZZ TRT BF421 TOSHIBA S ...

Страница 22: ...ET SET 37GQ21SESR RED S AR BC 1 2 HBDGB1017BMSB SHARP BADGE S AA AC 1 3 HDECQ0036BMSA R C DECORATION S AA AB 1 4 HDECQ0035BMSA LED DECORATION S AA AB 1 5 JBTN 1047BMSA UP DOWN BUTTON BLACK S AA AD 1 5 JBTN 1047BMSD UP DOWN BUTTON 37GQ20SDES METALLIC BLUE 026 S AA AE 1 5 JBTN 1047BMSC UP DOWN BUTTON YELLOW EM S AA AE 1 6 JBTN 1046BMSA POWER BUTTON BLACK S AA AB 1 6 JBTN 1046BMSD POWER BUTTON 37GQ20...

Страница 23: ...eck 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 24: ...und 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 25: ...heck 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 26: ...E VERTICAL 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 27: ...he White 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 28: ...22 37GQ 20FP RECICLED PAPER PRINTED BY ON ...

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