Panasonic CT-32D30UB Dados de serviço técnico

Procurar online ou descarregar pdf Dados de serviço técnico para TV Panasonic CT-32D30UB. Panasonic CT-32D30UB 12 páginas.

Imprimir página

SAFETY PRECA

SAFETY PRECAUTIONS

SAFETY PRECA

SER

SERVICE

SER

VICE WARNING

VICE

WARNING

SER

VICE

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.

SER

SERVICING

SER

VICING

VICING THE HIGH

VICING

THE HIGH V V V V V OL

THE HIGH

OLT T T T T A A A A A GE AND CR

GE AND CR

GE AND CRT T T T T

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-RAY RADIA

X-RA

Y RADIATION AND HIGH

Y RADIA

TION AND HIGH V V V V V OL

TION AND HIGH

OLT T T T T A A A A A GE 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 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.

HORIZONTAL OSCILLA

HORIZONT

AL OSCILLAT T T T T OR DISABLE

AL OSCILLA

Place a jumper between pins 3 and 4 of IC803. Apply 9.0V to the cathode of D001. Connect a

high voltage probe to the CRT anode. Set the AC supply to 45VAC. Turn the receiver on and

slowly increase the AC supply. Confirm the high voltage does not exceed 37.1kV when the

horizontal just begins to pull out of sync. If the high voltage should exceed 37.1kV or the

receiver fails to lose horizontal sync, the horizontal oscillator disable circuit should be repaired.

Remove jumper and the 9.0V DC supply.

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

P P P P P a a a a a g g g g g e 1

e 1

SET 4554

UTIONS

SAFETY CHECKS — FIRE AND SHOCK HAZARD

Cold Leakag g g g g e Chec

Cold Leaka

e Checks f

e Chec

ks for Receiver

ks f

or Receiver

or Receivers with Isolated Gr

or Receiver

s with Isolated Ground

s with Isolated Gr

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 Leaka

Hot Leakag g g g g e Current Chec

Hot Leaka

e Current Check k k k k

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.

OR DISABLE TEST

OR DISABLE

TEST

UPC

HERE

02PF01922

Technical Service Data

INDEX

Horizontal Oscillator Disable Test ......... 1

IC Functions ........................................... 1

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

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

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

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

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

Schematic Component Location ............ 2

Schematic Notes ..................................... 1

Schematics

Audio ............................................... 3

PIP ................................................... 4

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

System Control ................................ 2

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

Video ............................................... 3

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

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

For Supplier Ad

For Supplier Address,

dress,

For Supplier Ad

dress,

See PHO

See PHOT T T T T OF

OFA A A A A CT Ann

CT Ann

CT Annual Inde

ual Index x x x x

ual Inde

4554

P P P P P ANASONIC

ANASONIC

Model CT-32D20B (Chassis AP341)

Model CT

-32D20B (Chassis AP341)

Representative Model

Essential covera

Essential co

verag g g g g e e e e e

vera

Essential co

vera

f f f f f or ser

or servicing a tele

or ser

vicing a tele

vicing a television receiver

vision receiver

vision receiver... ... ... ... ...

or ser

vicing a tele

vision receiver

•

Sc Sc Sc Sc Schematics

hematics

• Component locations

Component locations

•

P P P P P ar ar ar ar arts list

ts list

Coverage includes these additional models and chassis:

Models

Chassis

CT-32D20UB

AP341

CT-32D30B

BP341

CT-32D30CB

BP341

CT-32D30UB

BP341

MARCH

MARCH 2002

MARCH

2002

SET 4554