Zenith B27B40Z Uživatelský manuál stáhnout pdf

SAFETY PRECASAFETY PRECA

SAFETY PRECA

UTIONSUTIONS

UTIONS

INDEXINDEX

INDEX

SET 4703SET 4703

SET 4703

MODEL B27B40ZMODEL B27B40Z

MODEL B27B40Z

ZENITHZENITH

ZENITH

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

IC Functions ........................................... 4

Important Parts Information ................... 3

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

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

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

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

Schematic Component Location ............ 3

Schematic Notes ..................................... 3

Schematics

A/V .................................................. 3

Audio ............................................... 2

PIP IF .............................................. 3

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

System Control ................................ 3

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

Service Mode Adjustment Chart ............ 1

Test Equipment ....................................... 3

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

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hematics

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Component locationsComponent locations

Component locations

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MARCH MARCH

MARCH

2003 SET 4703 2003 SET 4703

2003 SET 4703

ZENITHZENITH

ZENITH

Model B27B40ZModel B27B40Z

Model B27B40Z

4703

Technical Service Data

4703

SERSER

SER

VICE VICE

VICE

WARNINGWARNING

WARNING

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

VICING VICING

VICING

THE HIGH THE HIGH

THE HIGH

OLOL

GE AND CRGE AND CR

GE AND CR

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

Y RADIAY RADIA

Y RADIA

TION AND HIGH TION AND HIGH

TION AND HIGH

OLOL

GE LIMITSGE LIMITS

GE LIMITS

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

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.

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

SAFETY CHECKS — FIRE AND SHOCK HAZARD

Cold LeakaCold Leaka

Cold Leaka

e Chece Chec

e Chec

ks fks f

ks f

or Receiveror Receiver

or Receiver

s with Isolated Grs with Isolated Gr

s with Isolated Gr

oundound

ound

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

e Current Chece Current Chec

e Current Chec

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.

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

03PF02083

e 1e 1

e 1

SET 4703 SET 4703

SET 4703

UPC

HERE

4703

Representative Model

HIGH HIGH

HIGH

OLOL

GE SHUTDOGE SHUTDO

GE SHUTDO

WN WN

TESTTEST

TEST

Turn receiver on, adjust customer controls for normal operation. Temporarily apply an external bias of

14.0V to the emitter of QX3002. The receiver should lose raster. If the receiver does not lose raster the

shutdown circuit should be repaired. Remove AC power, wait 30 seconds and test for normal operation.

1 2 3 4 5 6 ... 14 15

Shrnutí obsahu

Strany 1 - Technical Service Data

SAFETY PRECASAFETY PRECASAFETY PRECASAFETY PRECASAFETY PRECAUTIONSUTIONSUTIONSUTIONSUTIONSINDEXINDEXINDEXINDEXINDEXSET 4703SET 4703SET 4703SET 4703SET

Strany 2 - TUNER INFORMATION

SET 4703 PSET 4703 PSET 4703 PSET 4703 PSET 4703 Paaaaaggggge 3e 3e 3e 3e 3ImporImporImporImporImportant Ptant Ptant Ptant Ptant P

Strany 3 - SERVICE MODE ADJUSTMENT CHART

SET 4703 PSET 4703 PSET 4703 PSET 4703 PSET 4703 Paaaaaggggge 3e 3e 3e 3e 3PPPPPaaaaaggggge 3e 3e 3e 3e 3 SET 4703 SET 4703

Strany 4

SET 4703 PSET 4703 PSET 4703 PSET 4703 PSET 4703 Paaaaaggggge 3e 3e 3e 3e 3ZENITH MODEL B27B40ZZENITH

Strany 5

PPPPPaaaaaggggge 4e 4e 4e 4e 4 SET 4703 SET 4703 SET 4703 SET 4703 SET 4703

Strany 6

Item No.Item No.Item No.Item No.Item No.TTTTType No.ype No.ype No.ype No.ype No.MfrMfrMfrMfrMfr... P P P P Pararararart No.t No.t No.t No.t No.NTE

Strany 7

Item No.Item No.Item No.Item No.Item No.Function/RatingFunction/RatingFunction/RatingFunction/RatingFunction/RatingMfrMfrMfrMfrMfr... P P P P Parara

Strany 8

MISCELLANEOUS ADJUSTMENTSPPPPPaaaaaggggge 1e 1e 1e 1e 1 SET 4703 SET 4703 SET 4703 SET 4703 SET 4703TUNER INFORMATIONMAIN MAIN MAIN MAI

Strany 9

SERVICE MODE ADJUSTMENT CHARTSET 4703 PSET 4703 PSET 4703 PSET 4703 PSET 4703 Paaaaaggggge 1e 1e 1e 1e 1FUNCTIONFUNCTIONFUNCTIONFU

Strany 10 - Annual Index

SET 4703 PSET 4703 PSET 4703 PSET 4703 PSET 4703 Paaaaaggggge 1e 1e 1e 1e 1ZENITH MODEL B27B40ZZENITH

Strany 11

PPPPPaaaaaggggge 2e 2e 2e 2e 2 SET 4703 SET 4703 SET 4703 SET 4703 SET 4703

Strany 12

SET 4703 PSET 4703 PSET 4703 PSET 4703 PSET 4703 Paaaaaggggge 2e 2e 2e 2e 2

Strany 13

PPPPPaaaaaggggge 2e 2e 2e 2e 2 SET 4703 SET 4703 SET 4703 SET 4703 SET 4703

Strany 14 - PARTS LIST

SET 4703 PSET 4703 PSET 4703 PSET 4703 PSET 4703 Paaaaaggggge 2e 2e 2e 2e 2ZENITH MODEL B27B40ZZENITH

Strany 15 - PARTS LIST continued

PPPPPaaaaaggggge 3e 3e 3e 3e 3 SET 4703 SET 4703 SET 4703 SET 4703 SET 4703

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