Hitachi C21-F880S Bedienungsanleitung

Dieses Handbuch passt für folgende Modelle

2

Inhaltsverzeichnis

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SAFETY PRECAUTIONS

1. An isolation transformer should be used to supply power to the TV during servicing

on the primary of the converter transformer of the set.

2.

Read and comply with all caution and safety related notes on the back cover,inside

the TV, on the PCBs and the picture tube.

3. When replacing a chassis in the cabinet, always be certain that all the protective

devices are installed properly (e.g. control knobs, adjustment covers or shields,

barriers, isolation resistor-capacitor networks etc.). Before returning the television

to the customer, the service technician must ensure that it is completely safe to

operate.

The primary source of X-RADIATION in television receiver is the picture tube. The

picture tube is specially constructed to limit X-RADIATION emissions. For continued

X-RADIATION protection,the replacement tube must be the same

type as the original

including suffix letter. Excessive high voltage may produce potentially hazardous

X-RADIATION. To avoid such hazards, the high voltage must be maintained within

specified limit. Refer to this service manual on the high voltage adjustment for the

specific high voltage limit.If high voltage exceeds the limits, take necessary corrective

action.Carefully follow the instructions for +B volt power supply adjustment, and high

voltage check to maintain the high voltage within the specified limits.

Maintenance and repair of this TV should be done by qualified service personnel only

when servicing the high voltage system, remove static charge from it by discharging

the picture tube (2nd anode lead) to the dag coating (picture tube grounding lead).

X-RADIATION PRECAUTION

PRODUCT SAFETY NOTICE

IMPORTANT SAFETY NOTE

Maintenance and repair of this TV should be done by qualified service per onnel nly

.

o

Critical parts that have special safety characteristics are identified by a in the

replacement parts list or the schematic diagrams.Use of any substitute replacement

part that does not have the same safety characteristics as the recommended

replacement part in the parts list might create shock, fire and/or other hazards.

Please do notdegrade the safetyof this TV through improper servicing.

!

s

9

-3--3-

TECHNICAL SPECIFICATION

FREQUENCY

FS

-4-

TECHNICAL SPECIFICATION

E

-5-

CHASSIS BLOCK DIAGRAM

-6-

IC 121 (Universal HI-FI Audio Processor) TDA9859

IC BLOCK DIAGRAM

IC 161 TDA8944J(BTL Audio Amplifier)

-7-

IC 401 (Vertical Deflection Booster) STV9302A

IC BLOCK DIAGRAM

-8-

IC 601 (Power Switch) KA5Q0765RTH

IC 501(Video Output Amplifier) TDA6107Q

IC BLOCK DIAGRAM

7

-9-

1

INPUT

2

OUTPUT

SERIES

PASS

ELEMENT

SOA

PROTECTION

REFERENCE

VOLTAGE

ERROR

AMPLIFIER

THERRMAL

PROTECTION

STARTING

CIRCUIT

CURRENT

GENERATOR

REFERENCE

VOLTAGE

3

GND

IC 653 & IC 181& IC 652 (Regulators) L7800 Series

1

23

4

1:ANODE

2:CATHODE

3:EMITTER

4:COLLECTOR

IC 602 (Photo Transistor ) TLP621

IC BLOCK DIAGRAM

TLP621

-10-

IC 701 ( TDA93XXPS/N2/5ITV Signal Processor-Teletext )

IC BLOCK DIAGRAM