GE 27gt630 schematic

SAFETY PRECASAFETY PRECA

SAFETY PRECA

SAFETY PRECASAFETY PRECA

SERSER

VICE VICE

SER

SERSER

Only qualified service technicians who are familiar with safety checks and guidelines should perform service work. Before replacing parts, disconnect power source to protect electrostatically sensitive parts. Do not attempt to modify any circuit unless so recommended by the manufacturer. When servicing the receiver, use an isolation transformer between the line cord and power receptacle.

SERSER

SER

SERSER

Use EXTREME CAUTION when servicing the high voltage circuits. To discharge static high voltage, connect a 10K ohms resistor in series with a test lead between the receiver ground and CRT anode lead. DO NOT lift the CRT by the neck. Always wear shatterproof goggles when handling the CRT to protect eyes in case of implosion.

X-RAX-RA

X-RA

X-RAX-RA

Be aware of the instructions and procedures covering X-ray radiation. In solid-state receivers and monitors, the CRT is the only potential source of X-rays. Keep an accurate high voltage meter available at all times. Check meter calibration periodically. Whenever servicing a receiver, check the high voltage at various brightness levels to be sure it is regulating properly. Keep high voltage at rated value, NO HIGHER. Excessive high voltage may cause X-ray radiation or failure of associated components. DO NOT depend on protection circuits to keep voltage at rated value. When troubleshooting a receiver with excessive high voltage, avoid close contact with the CRT. DO NOT operate the receiver longer than necessary. To locate the cause of excessive high voltage, use a variable AC transformer to regulate voltage. In present receivers, many electrical and mechanical components have safety related characteristics which are not detectable by visual inspection. Such components are identified by a # on both the schematic and the parts list. For SAFETY, use only equivalent replacement parts when replacing these components.

GENERAL GUIDELINESGENERAL GUIDELINES

GENERAL GUIDELINES

GENERAL GUIDELINESGENERAL GUIDELINES

Perform a final SAFETY CHECK before returning receiver to customer. Check repaired area for poorly soldered connections, and check entire circuit board for solder splashes. Check board wiring for pinched wires or wires contacting any high wattage resistors. Check that all control knobs, shields, covers, grounds, and mounting hardware have been replaced. Be sure to replace all insulators and restore proper lead dress.

WARNINGWARNING

VICE

WARNING

VICE VICE

WARNINGWARNING

VICING VICING

VICING

VICING VICING

Y RADIAY RADIA

Y RADIA

Y RADIAY RADIA

THE HIGH THE HIGH

THE HIGH

THE HIGH THE HIGH

TION AND HIGH TION AND HIGH

TION AND HIGH

TION AND HIGH TION AND HIGH

OLOL

GE AND CRGE AND CR

GE AND CR

GE AND CRGE AND CR

OLOL

GE LIMITSGE LIMITS

GE LIMITS

GE LIMITSGE LIMITS

UTIONSUTIONS

UTIONS

UTIONSUTIONS

SAFETY CHECKS — FIRE AND SHOCK HAZARDSAFETY CHECKS — FIRE AND SHOCK HAZARD

SAFETY CHECKS — FIRE AND SHOCK HAZARD

SAFETY CHECKS — FIRE AND SHOCK HAZARDSAFETY CHECKS — FIRE AND SHOCK HAZARD

Cold LeakaCold Leaka

Cold Leaka

Cold LeakaCold Leaka

Unplug the AC cord, connect a jumper across the plug prongs, and turn the power switch on (if applicable). Use an ohmmeter to measure the resistance between the jumped AC plug and any exposed metal cabinet parts such as antenna screw heads, control shafts, or handle brackets. Exposed metal parts with a return path should measure between 1M ohms and 5.2M ohms. Parts without a return path must measure infinity.

Hot LeakaHot Leaka

Hot Leaka

Hot LeakaHot Leaka

Plug the AC cord directly into an AC outlet. DO NOT use an isolation transformer. Use a 1500 ohms, 10W resistor in parallel with a .15µF capacitor to connect between any exposed metal parts on the receiver and a good earth ground. (See figure below.) Use an AC voltmeter with at least 5000 ohms per volt sensitivity to measure the voltage across the resistor. Check all exposed metal parts and measure voltage at each point. Voltage measurements should not exceed .75VAC, 500µA. Any value exceeding this limit constitutes a potential shock hazard and must be corrected. If the AC plug is not polarized, reverse the AC plug and repeat exposed metal part voltage measurement at each point.

e Chece Chec

e Chec

e Chece Chec

ks fks f

ks f

ks fks f

e Current Chece Current Chec

e Current Chec

e Current Chece Current Chec

or Receiveror Receiver

or Receiver

or Receiveror Receiver

s with Isolated Grs with Isolated Gr

s with Isolated Gr

s with Isolated Grs with Isolated Gr

oundound

ound

oundound

4631

SET 4631SET 4631

SET 4631

Error Codes Chart .................................. 1

High Voltage Shutdown Test .................. 1

IC Functions ........................................... 2

Important Parts Information ................... 1

Miscellaneous Adjustments .................... 1

Parts List ................................................. 4

Placement Chart ..................................... 1

Safety Precautions .................................. 1

Schematic Component Location ............ 1

Schematic Notes ..................................... 2

Schematics

Test Equipment....................................... 1

Tuner Information .................................. 1

INDEXINDEX

INDEX

INDEXINDEX

Audio ............................................... 4

Gemstar 4 ........................................ 3

Power Supply .................................. 2

Television ........................................ 2

Technical Service Data

GEGE

Model 27GT630TX51 (Chassis CTC203AA5)Model 27GT630TX51 (Chassis CTC203AA5)

Model 27GT630TX51 (Chassis CTC203AA5)

Model 27GT630TX51 (Chassis CTC203AA5)Model 27GT630TX51 (Chassis CTC203AA5)

Representative Model

or seror ser

or ser

or seror ser

Essential coEssential co

Essential co

Essential coEssential co

vicing a televicing a tele

vicing a tele

vicing a televicing a tele

ScSc

hematicshematics

•

hematics

ScSc

hematicshematics

veravera

vera

veravera

vision receivervision receiver

vision receiver

vision receivervision receiver

......

...

......

4631

HIGH HIGH

OLOL

HIGH

HIGH HIGH

Momentarily short BC14901 at base of Q14901 to ground. The receiver should lose raster and sound. If receiver does not lose raster and sound, the shutdown circuit should be repaired. To resume normal operation, remove AC power for approximately 30 seconds and then turn the receiver on.

The listing of any available replacement part herein in no case constitutes a recommendation, warranty, or guarantee by SAMS Technical Publishing as to the quality and suitability of such replacement part. The numbers of the listed parts have been compiled from information furnished to SAMS Technical Publishing by the manufacturers of the specific type of replacement part listed.

Reproduction or use, without express permission, of editorial or pictorial content, in any manner, is prohibited. No patent liability is assumed with respect to the use of the information contained herein.

5436 West 78th Street Indianapolis, IN 46268-4149

Printed in the United States of America 5 4 3 2 1

e 1e 1

e 1

e 1e 1

SET 4631 SET 4631

SET 4631

SET 4631 SET 4631

GE SHUTDOGE SHUTDO

GE SHUTDO

OLOL

GE SHUTDOGE SHUTDO

WN WN

TESTTEST

TEST

WN WN

TESTTEST

02PF02003

UPC

HERE

MODEL 27GT630TX51 (CHASSIS CTC203AA5)MODEL 27GT630TX51 (CHASSIS CTC203AA5)

MODEL 27GT630TX51 (CHASSIS CTC203AA5)

GEGE

For Supplier AdFor Supplier Ad

For Supplier Ad

For Supplier AdFor Supplier Ad

See PHOSee PHO

See PHO

See PHOSee PHO

OFOF

CT AnnCT Ann

CT Ann

CT AnnCT Ann

dress,dress,

dress,

dress,dress,

ual Indeual Inde

ual Inde

ual Indeual Inde

Component locationsComponent locations

•

Component locations

Component locationsComponent locations

arar

ts listts list

•

ts list

arar

ts listts list

Coverage includes these additional models and chassis:

ModelsModels

Models

ModelsModels

27GT630TX51 CTC203AA9 27GT630YX51 CTC203AA5

SEPTEMBER SEPTEMBER

SEPTEMBER

SEPTEMBER SEPTEMBER

2002 SET 4631 2002 SET 4631

2002 SET 4631

2002 SET 4631 2002 SET 4631

ChassisChassis

Chassis

ChassisChassis

e 1e 1

e 1

e 1e 1

SET 4631 SET 4631

SET 4631

SET 4631 SET 4631

TUNER INFORMATION

TUNER TUNER

TUNER

TUNER TUNER

PinPin

AGC (1) 2.4V 2.3V 2.8V NC (2) 1.3V 4.2V 5.5V +5V (3) 5.2V 5.2V 5.2V CLK (4) 5.0V 5.0V 5.0V DATA (5) 5.0V 5.0V 5.0V +5V (6) 5.2V 5.2V 5.2V +5V (7) 5.2V 5.2V 5.2V +32V (9) 34.2V 34.2V 34.2V IF (11) 0V 0V 0V

NOTE: VHF Low Band voltages taken on channel 2.

OLOL

GE CHARGE CHAR

GE CHAR

GE CHARGE CHAR

VHF LoVHF Lo

VHF Lo

VHF LoVHF Lo

w Bandw Band

w Band

w Bandw Band

VHF High BandVHF High Band

VHF High Band

VHF High BandVHF High Band

UHF BandUHF Band

UHF Band

UHF BandUHF Band

VHF High Band voltages taken on channel 7. UHF Band voltages taken on channel 14

ImporImpor

Impor

ImporImpor

ν The parts listed here are those not usually available from a well-stocked supply cabinet or bin.

ν Where items may be replaced with equivalent parts, several alternates are shown from participating vendors.

ν On the parts lists, safety items are marked with a

these items.

ν When ordering parts, state the model number, part number, and description.

Many of these parts are available from your local Sams authorized distributor or the manufacturer of the equipment. Call Sams for the name of your nearest distributor:

Or consult the Sams

Annual Index

for the address of the original equipment manufacturer.

Information on test equipment and replacement parts is listed in these pages for the following participating vendors. Consult the Sams

ν NTE Electronics, Inc. (NTE)

Annual Index

for their current address.

TUNER TUNER

TUNER

TUNER TUNER

tant Ptant P

arar

ts Infts Inf

tant P

tant Ptant P

arar

# #

# to remind you that only exact replacements are recommended for

# #

Obtaining PObtaining P

Obtaining P

Obtaining PObtaining P

ts Inf

ts Infts Inf

ormationormation

ormation

ormationormation

arar

tsts

arar

tsts

TERMINAL GUIDETERMINAL GUIDE

TERMINAL GUIDE

TERMINAL GUIDETERMINAL GUIDE

(2)

(4)

(6)

(8)

(10)

(1)

(3)

(5)

(7)

(9)

(11)

800-428-7267

arar

ticipating ticipating

ticipating

arar

ticipating ticipating

endorendor

endor

endorendor

ν Sencore, Inc.

SCHEMASCHEMA

SCHEMA

SCHEMASCHEMA

C11403 C5 C11450 B46 C11451 B46 C11453 C51 C11454 C51 C11455 C51 C11456 C51 C11501 D48 C11502 D48 C11503 D51 C11504 D51 C11506 D46 C11507 E46 C11601 A46 C11602 C46 C11603 C46 C11604 C48 C11605 D48 C11606 C48 C11607 C48 C11608 B46 C11609 B46 C11610 C46 C11611 B46 C11612 D46 C11613 D46 C11614 C46 C11615 C46 C11616 C45 C11617 A47 C11618 D46 C11619 A46 C11620 C48 C11621 B48 C11622 B48 C11623 D48 C11624 A46 C11625 D48 C11626 A47 C11627 A47 C11628 A48 C11629 B47 C11630 A49 C11631 A49 C11632 A46 C11633 A46 C11701 E45 C11702 D46 C11703 D46 C11704 E46 C11705 E46 C11906 A50 C11907 B50 C11908 C51 C11909 B51 C11910 A50 C11912 B50 C11913 A52 C11914 B52 C12301 C1 C12302 B1 C12303 D29 C12304 A4 C12305 A5 C12306 C2 C12307 C3 C12308 C3 C12310 B4 C12312 C28 C12313 C3 C12314 C28 C12701 A9 C12702 C11 C12703 C11 C12704 C10 C12706 D4 C12707 C28 C12708 C28 C12709 B11 C12710 B11 C12711 B11 C12712 A28 C12713 C11 C12714 C13 C12715 B13 C12716 B13 C12717 C10

TIC COMPONENT LOCATIC COMPONENT LOCA

TIC COMPONENT LOCA

TIC COMPONENT LOCATIC COMPONENT LOCA

C12718 C11 C12801 C9 C12802 B8 C12803 C10 C12805 B8 C12806 C9 C12807 C9 C13102 A10 C13114 D29 C13119 B36 C13141 D33 C13163 C24 C13201 A29 C13202 A29 C13205 A43 C13501 E32 C13502 E32 C13503 E32 C13504 D31 C14101 B19 C14102 B20 C14103 B19 C14104 C19 C14105 C19 C14106 C20 C14107 C20 C14108 A20 C14109 A22 C14110 A24 C14111 B23 C14112 B23 C14113 B21 C14114 B24 C14115 B21 C14116 C23 C14118 A28 C14119 B24 C14121 B24 C14122 A24 C14124 A22 C14125 B20 C14126 C19 C14127 C20 C14150 C28 C14151 C26 C14152 B24 C14153 B24 C14154 C27 C14155 B28 C14158 B24 C14159 B23 C14160 B27 C14201 A17 C14203 A19 C14203 A19 C14204 A19 C14204 B19 C14205 A20 C14207 B17 C14208 A17 C14209 A18 C14210 A18 C14211 B18 C14212 C17 C14213 C17 C14302 E5 C14303 E5 C14304 E6 C14305 E6 C14306 E6 C14309 E5 C14310 E5 C14320 D2 C14321 D2 C14322 E4 C14401 E7 C14402 E9 C14403 D9 C14404 D9 C14405 D10 C14406 E8 C14502 D6 C14504 D8 C14505 D7 C14506 E21 C14507 E21 C14521 D5

C14701 E20 C14702 D19 C14703 D19 C14704 D19 C14706 E20 C14710 E3 C14711 E21 C14901 E3 C14902 E2 C14903 D3 C14904 D3 C15101 D15 C17416 B35 C17417 C35 C26401 D33 C26402 C33 C26404 E41 C26408 A31 C26409 A32 C26410 D34 C26411 A34 C26412 D31 C26413 E30 C26414 B34 C26415 A34 C26418 E34 C26419 C30 C26422 D34 C26425 B34 C26426 C34 C26427 B30 C26428 C31 C26429 B31 C26430 B31 C26432 A32 C26433 D33 C26435 D31 C26437 C32 C26438 B32 C26439 B32 C26440 B41 C26441 C30 C26444 C29 C26445 B24 C26446 E30 C26447 B28 C26448 D28 C26449 D28 C26450 E28 C26451 E28 C26452 E27 C26453 E27 C26454 E27 C26455 E28 C26456 E28 C26457 E28 C26458 E27 C26459 E27 C26460 E26 C26461 E28 C26466 D28 C26467 E26 C26468 E28 C26469 D27 C26470 A43 C26471 E27 C26472 D33 C26473 B33 C26474 D31 C26477 E27 C26487 D27 C26490 D28 C26499 D26 C26901 B27 C26902 B27 C26910 B27 C26915 B5 C26916 B5 CF12201 A3 CF12301 B4 CR11401 C5 CR11501 D49 CR11502 D49 CR11503 D51 CR11504 D23 CR11505 D24 CR11601 B49

TION GUIDETION GUIDE

TION GUIDE

TION GUIDETION GUIDE

CR11602 C45 CR11603 C45 CR12301 B5 CR12702 E4 CR13501 E32 CR14101 B18 CR14102 B19 CR14103 C19 CR14104 C19 CR14105 C19 CR14106 A22 CR14107 B23 CR14108 B21 CR14109 C21 CR14110 B23 CR14111 D21 CR14113 E24 CR14114 E24 CR14115 C27 CR14117 C19 CR14201 A19 CR14202 A18 CR14203 A19 CR14204 A18 CR14205 B18 CR14210 A19 CR14301 E5 CR14401 D10 CR14501 D7 CR14701 E19 CR14702 D19 CR14704 E20 CR14901 E3 CR14902 E3 CR26901 B28 DY1 D9 F14201 A17 FB13201 A42 FB14106 B22 FB14107 A22 FB14108 A22 FB14109 B20 FB14110 A24 FB14114 B21 FB14401 E8 FB14501 D5 FB26401 D26 FB26402 E24 FB26403 B41 FB26404 A43 IR13201 A29 J11401 C4 J11401 B45 J11401 B45 J13201 A44 K14201 A18 K14201 B18 L12301 B4 L12302 B3 L12303 B4 L12305 C27 L12705 C27 L14101 B28 L14102 B22 L14103 A24 L14105 A23 L14200 A18 L14401 E7 L14402 E9 L15101 D20 L26401 E27 L26901 B27 PW14101 A17 Q11501 D23 Q11603 C46 Q11901 C49 Q12301 B4 Q12701 C13 Q12702 A13 Q12703 B13 Q12704 B13 Q13101 A10 Q13103 D30 Q13104 B35 Q13105 B35 Q13301 D29 Q13302 D30

Q13501 D32 Q13503 D32 Q14101 B20 Q14102 B19 Q14103 B19 Q14104 A25 Q14105 A25 Q14106 D20 Q14107 D21 Q14115 B27 Q14201 B17 Q14301 E6 Q14302 E5 Q14401 E7 Q14901 D3 Q15101 A14 Q15102 C14 Q15103 B14 Q26401 C30 Q26402 C30 Q26403 D25 Q26404 E25 Q26405 B32 Q26410 A43 Q26411 B43 Q26450 B42 Q26451 A42 Q26901 B7 Q26903 C5 R11401 B46 R11402 B46 R11403 B46 R11404 B46 R11405 C4 R11406 C5 R11460 B46 R11461 B46 R11462 C51 R11463 C51 R11501 D48 R11502 D48 R11503 D48 R11504 D48 R11505 D49 R11506 D48 R11507 D49 R11508 D50 R11509 D50 R11510 D50 R11511 D46 R11512 E46 R11513 D23 R11514 C23 R11601 A46 R11602 D47 R11603 C47 R11604 C47 R11605 B46 R11606 D46 R11607 D46 R11608 D46 R11609 D46 R11611 A48 R11612 A48 R11613 B48 R11614 A49 R11615 C46 R11616 C46 R11617 B46 R11618 A46 R11619 C45 R11620 C45 R11621 B48 R11622 B48 R11623 B49 R11624 B49 R11625 A49 R11626 A49 R11627 C46 R11628 A46 R11629 A46 R11630 A46 R11631 A46 R11701 D45 R11702 E45 R11703 D45 R11704 D46

R11705 D46 R11706 E46 R11707 E47 R11708 D45 R11709 E45 R11909 C51 R11910 A50 R11911 A50 R11912 B50 R11913 B50 R11915 B49 R11917 C49 R11918 C49 R11919 C49 R11920 A52 R11921 B52 R12201 A3 R12302 B2 R12303 B1 R12304 B4 R12305 D29 R12306 E24 R12307 B5 R12308 A5 R12309 B4 R12310 B4 R12311 B4 R12314 C2 R12315 C2 R12316 C3 R12317 B4 R12318 B4 R12701 C11 R12702 E4 R12703 C11 R12704 A9 R12705 C10 R12706 C12 R12707 A12 R12708 B12 R12710 B2 R12711 B2 R12712 B12 R12713 B12 R12714 B11 R12715 C13 R12716 C13 R12717 C13 R12718 C13 R12719 A13 R12720 A13 R12721 A13 R12722 A13 R12723 B13 R12724 B13 R12725 B13 R12726 C11 R12727 B13 R12731 D3 R12801 C9 R12802 C9 R12803 C10 R12804 C9 R12805 B8 R12806 C9 R12807 C9 R12808 C9 R13101 A10 R13102 A10 R13103 A10 R13108 A9 R13109 D29 R13110 D29 R13111 D30 R13112 D30 R13113 C30 R13118 B30 R13119 B30 R13121 B27 R13122 A30 R13123 B23 R13124 C29 R13125 C29 R13126 B30 R13128 B35 R13130 C35 R13131 B35

R13134 A35 R13135 A35 R13136 B35 R13139 A36 R13142 A35 R13143 D32 R13144 E35 R13165 A32 R13166 B35 R13169 C35 R13176 B35 R13180 B35 R13181 B35 R13182 B34 R13183 E29 R13184 E30 R13185 E29 R13188 C30 R13189 B30 R13190 B30 R13191 B30 R13192 D35 R13198 A32 R13201 A30 R13202 A29 R13203 A44 R13314 D30 R13315 D29 R13316 D30 R13317 E29 R13318 E29 R13319 E29 R13320 E29 R13321 E30 R13322 E29 R13501 E32 R13503 E32 R13504 E33 R13505 D32 R13508 D32 R13510 D33 R13511 E31 R13512 D31 R14101 B18 R14102 B18 R14103 B19 R14104 B19 R14105 C20 R14106 B19 R14107 B19 R14108 B20 R14109 B19 R14110 B19 R14111 C19 R14112 C19 R14113 C20 R14114 C20 R14115 D20 R14116 D20 R14117 A20 R14118 A24 R14119 A23 R14120 C23 R14121 A32 R14122 A25 R14123 A25 R14124 B22 R14126 D20 R14127 D21 R14128 D21 R14129 C20 R14130 C23 R14132 D21 R14135 D20 R14151 C26 R14153 B23 R14155 B27 R14157 B27 R14158 B27 R14159 B27 R14201 A17 R14202 A18 R14204 A20 R14205 A17 R14206 B17 R14303 D1 R14304 E5

R14305 E6 R14306 E6 R14309 E5 R14310 E4 R14318 E1 R14319 E1 R14320 D2 R14321 D4 R14322 E4 R14323 D4 R14324 D1 R14326 D1 R14327 D1 R14328 D5 R14401 D10 R14402 E7 R14403 E10 R14501 D8 R14503 D5 R14504 D6 R14506 D6 R14507 D8 R14508 E20 R14509 E21 R14520 D5 R14701 D19 R14702 D20 R14703 A16 R14704 E3 R14705 E3 R14706 D3 R14851 D4 R14901 E3 R14902 E2 R14903 E2 R14904 D3 R14906 E3 R14909 D3 R14910 D2 R15101 A15 R15102 C15 R15103 B15 R15104 A15 R15105 C15 R15106 B15 R15107 A14 R15108 C14 R15109 B14 R15118 D16 R17130 C1 R17402 B35 R17403 C35 R17409 C35 R17411 C35 R26401 C33 R26402 C43 R26403 C42 R26404 C42 R26405 C41 R26406 E41 R26410 A42 R26411 A31 R26412 A31 R26413 D34 R26414 A34 R26415 D31 R26416 E31 R26417 B34 R26418 A34 R26419 B42 R26420 B42 R26421 C31 R26422 E34 R26423 C30 R26427 D34 R26430 B34 R26431 C34 R26432 B31 R26433 C31 R26434 B31 R26435 B31 R26437 A31 R26438 D33 R26439 D33 R26441 D31 R26443 C32 R26444 B32

R26445 B32 R26446 B32 R26447 D30 R26448 C30 R26449 C30 R26450 C30 R26451 C30 R26452 C29 R26453 A41 R26454 A41 R26455 E31 R26456 A41 R26457 A41 R26458 C32 R26459 B32 R26460 B32 R26461 B33 R26462 D28 R26463 E25 R26464 E27 R26465 E27 R26466 E25 R26467 E25 R26468 E26 R26469 B39 R26475 E33 R26477 C38 R26478 C30 R26484 B32 R26486 B31 R26487 B32 R26488 B32 R26489 B32 R26490 A42 R26491 B42 R26492 B43 R26495 B43 R26496 B43 R26497 B43 R26498 A43 R26499 A42 R26506 E27 R26901 B27 R26914 C5 R26915 C5 R26916 B6 R26917 B7 R26921 C5 R26922 C5 R26923 B5 R26924 B5 R26925 C5 R5050 D12 RN14501 D5 RT14201 A18 SF12301 B1 SP1 A52 SP2 B52 SW13201 B29 SW13202 B29 SW13203 B29 SW13204 B29 SW13205 B29 SW13206 B29 T14101 A21 T14201 A17 T14301 E7 T14401 D11 T14401 E18 U11501 D45 U11501 D49 U11501 D50 U11501 E45 U11601 A47 U11602 A48 U11602 B49 U11900 A51 U11901 B51 U12101 A4 U12101 B2 U12101 B9 U12101 D2 U13102 A36 U14101 C19 U14102 D19 U14103 C23 U14104 A26

U14150 C27 U14501 D7 U26401 C32 U26401 C41 U26402 A39 U26403 A37 U26404 E26 U26903 B6 V101 C16 Y12801 B10 Y14101 D2 Y26401 C33

SET 4631 PSET 4631 P

SET 4631 P

SET 4631 PSET 4631 P

e 1e 1

e 1

e 1e 1

MISCELLANEOUS ADJUSTMENTS

NOTE: All procedures require an antenna connected and power applied to the set.

HIGH HIGH

OLOL

HIGH

HIGH HIGH

Tune in a picture. Set brightness, contrast, and color to MINIMUM. Connect a high voltage probe to the CRT anode. High voltage should measure 28kV to 30kV.

SERSER

VICE MENUVICE MENU

SER

VICE MENU

SERSER

VICE MENUVICE MENU

The following adjustment procedures are accessed thru a service menu. To access the service menu, turn the receiver on, press the menu button and hold it down while pressing the power button. While holding down the menu button, release the power button and press the volume + button. The screen will display a one line menu, on the left the parameter P0, and on the right the value of that parameter V0. Release buttons. Adjustments are made by selecting the proper parameter and changing the value of that parameter. To change the parameter number use channel up and down buttons. To adjust the current value of that parameter use volume + and - buttons. To access and change any of the adjustments, the proper parameter pass number must be entered. This information is listed at the beginning of the alignment. When these parameters are modified, the T-Chip and the corresponding EEPROM are updated. All service adjustments are bus controlled, except focus and screen.

NOTE: In order to adjust the RF AGC, audio or video levels, tuner, PIP, or stereo circuits, the ChipperCheck hardware and software must be used. This can be purchased from Thomson Electronics. Before making any changes to any of the values, record the On Set values.

SERSER

VICE ADJUSTMENT PARAMETERSVICE ADJUSTMENT PARAMETERS

SER

VICE ADJUSTMENT PARAMETERS

SERSER

VICE ADJUSTMENT PARAMETERSVICE ADJUSTMENT PARAMETERS

arameterarameter

arameter

arameterarameter

No.No.

No.

No.No.

0 Pass number for service Must set to 76. - May not advance until value is set to 76.

1 Error Code 1 0 0 - 255 Displays the first error detected. Set to 0 before exiting.

2 Error Code 2 0 0 - 255 Displays the second error detected. Set to 0 before exiting.

3 Error Code 3 0 0 - 255 Displays the last error detected. Set to 0 before exiting.

4 Horizontal Phase 10 0 - 15 Tune in a crosshatch pattern, adjust to center the pattern on the screen. 5 EW DC (Width) 16 0 - 31 Tune in a crosshatch pattern, adjust for slight horizontal overscan. 6 EW Amplitude 8 0 - 15 Set value to 8. 7 EW Tilt 8 0 - 15 Set value to 8. 8 Top Corner Pin Correction 2 0 - 7 Set value to 2. 9 Bottom Corner Pin Correction 2 0 - 7 Set value to 2. 10 Vertical DC 33 0 - 63 Tune in a crosshatch pattern, adjust to center vertically. 11 Vertical Size 84 0 - 127 Tune in a crosshatch pattern, adjust for slight vertical overscan. 12 Vertical Countdown Mode 0 0 - 3 Set value to 0. ( 0 = Standard, 1 = Non-Standard, 2 = 50Hz, 3 = 48Hz ) 13 Red Bias 30 0 - 127 Press menu button on the TV set for setup line. 14 Green Bias 15 0 - 127 Press menu button on the TV set for setup line. 15 Blue Bias 34 0 - 127 Press menu button on the TV set for setup line. 16 Red Drive 41 0 - 63 17 Green Drive 33 0 - 63 18 Blue Drive 32 0 - 63 19 Gemstar Horizontal OSD Position 166 0 - 255 Set value to 166. 20 Gemstar Vertical OSD Position 68 0 - 255 Set value to 68. 21 Gemstar PIP Horizontal Position 40 0 - 255 Set value to 40. 22 Gemstar PIP Vertical Position 43 0 - 255 Set value to 43. 23 Gemstar PIP Window Vertical Size 3 0 - 13 Set value to 3.

GE CHECKGE CHECK

GE CHECK

OLOL

GE CHECKGE CHECK

arameterarameter

arameter

arameterarameter

NameName

Name

NameName

adjustment parameters.

On SetOn Set

On Set

On SetOn Set VV

aluealue

alue

aluealue

alue

aluealue

RangRang

Rang

RangRang

COLOR COLOR

COLOR

COLOR COLOR

NOTE: See Service Adjustment Parameters to change drive and bias values.

Press menu button for collapsed raster service line. Disconnect the antenna. Preset the red, green, and blue drive values to 32. Adjust screen control for a service line that is just visible. Adjust red, green, and blue drives to obtain a white raster. Check the low light to high light gray scale tracking. Repeat the procedure, if necessary, to obtain the best performance.

CommentComment

Comment

CommentComment

TEMPERATEMPERA

TEMPERA

TEMPERATEMPERA

See Error Codes Chart.

TURETURE

TURE

TURETURE

ERRERR

ERR

ERRERR

ErrErr

or Codeor Code

Err

or Code

ErrErr

or Codeor Code

DECDEC

DEC

DECDEC

0 00 No error code 1 01 16.0V fault 16.0V STBY source is failing. 3 03 12.0V run fault 12.0V source is failing. 4 04 T4 Chip Run supply failed. 8 08 T4 Chip X-ray protection caused high voltage shutdown. 9 09 T4 Chip (POR) Power supply problem at (POR) power on reset. 10 0A F2 PIP module error (POR) Power supply problem at (POR) power on reset/PIP. 11 0B Stereo decoder (POR) Power supply problem at reset/Stereo decoder. 16 10 Run IIC Bus held low Run IIC clock or data held low. 18 12 Standby IIC Bus held low Standby IIC clock or data held low. 23 17 Gemstar 4 Board Guide fatal error on set using Gemstar 4 Board. 24 18 Gemstar 4 Board Task monitor error on set using Gemstar 4 Board. 25 19 Gemstar 4 Board Watchdog error on set using Gemstar 4 Board. 34 22 Gemstar Board Gemstar fails to acknowledge. 44 2C F2 PIP module error F2PIP fails to acknowledge. 102 66 Octal DAC Octal DAC fails to acknowledge. 128 80 Stereo decoder Stereo decoder fails to acknowledge. 160 A0 Main or PIP tuner EEPROM Main or PIP tuner EEPROM fails to acknowledge. 186 BA T4 Chip T4 Chip fails to acknowledge. 196 C4 Main tuner PLL/DAC Main tuner PLL IC fails to acknowledge. 198 C6 Main tuner PLL/DAC Main tuner DAC IC fails to acknowledge.

ERRERR

ERR

ERRERR

If certain failures occur, the matching error codes will be stored in the EEPROM. These error codes will be displayed in parameters 1, 2, and 3. The first failure error code will be stored at parameter 1 and the second failure error code will be stored at parameter 2. Parameter 3 will be updated to display the most recent failure occurred in the chassis. If a failure of a bus IC occurred, the normal acknowledgment checking of that bus will be disabled in the service mode and the address of that IC which failed will be stored in one of the error code parameters. After every repair is done to the chassis it is recommended to check the error code parameters, and reset them back to value 0.

HEX HEX

HEX

HEX HEX

OR CODESOR CODES

OR CODES

OR CODESOR CODES

Test equipment listed by participating manufacturer illustrates typical or equivalent equipment used by Sams engineers to obtain measurements. This equipment is compatible with most types used by field service technicians.

EquipmentEquipment

Equipment

EquipmentEquipment

Oscilloscope SC3100 Generators

RGB CM2125 Multiburst Signal VG91 Color Bar VG91

TV Stereo VG91 Digital VOM SC3100 Frequency Meter SC3100 Hi-Voltage Probe HP200 Accessory Probes TP212

ErrErr

or Locationor Location

Err

or Location

ErrErr

or Locationor Location

OR CODES CHAROR CODES CHAR

OR CODES CHAR

OR CODES CHAROR CODES CHAR

Condition IndicatedCondition Indicated

Condition Indicated

Condition IndicatedCondition Indicated

TEST EQTEST EQ

TEST EQ

TEST EQTEST EQ

Sencore No.Sencore No.

Sencore No.

Sencore No.Sencore No.

UIPMENTUIPMENT

UIPMENT

UIPMENTUIPMENT

EquipmentEquipment

Equipment

EquipmentEquipment

Isolation Transformer PR570 Capacitance Analyzer LC102 CRT Analyzer CR7000 AC Leakage Tester PR570 Inductance Analyzer LC102 Flyback Yoke Tester TVA92 Field Strength Meter SL753 Transistor Tester TF46 Horizontal Analyzer HA-2500 Video Analyzer VG91, TVA92

Sencore No.Sencore No.

Sencore No.

Sencore No.Sencore No.

GE MODEL 27GT630TX51 (CHASSIS CTC203AA5)

GE MODEL 27GT630TX51 (CHASSIS CTC203AA5)GE MODEL 27GT630TX51 (CHASSIS CTC203AA5)

SET 4631 PSET 4631 P

SET 4631 P

SET 4631 PSET 4631 P

e 1e 1

e 1

e 1e 1

+ 8 hidden pages