2SC752 datasheet(12/126 Pages) TOSHIBA

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8. SELF DIAGNOSTIC FUNCTION

1) Press “9” button on Remote Control during display of adjustment menu in the service mode.

The diagnosis will begin to check if interface among IC’s are executed properly.

2) During diagnosis, the following displays are shown.

2300****

POWER

: 00

BUS CONT : OK

BLOCK

: UV V1 V2 V3

QV01

Part number of microcomputer (QA01)

Operation number of protecting circuit ----“00” is nor-

mal.

When indication is other than “00”, overcurrent apts to

flow, and circuit parts may possibly be damaged.

BUS CONT ----“OK” is normal.

When indication shows “Q uuu (Green: OK, Red:

NG)”, the device with the number may possibly be dam-

aged.

BLOCK

: TV reception mode

: VIDEO 1 input mode (a1)

: VIDEO 2 input mode (a2)

: VIDEO 3 input mode (a3)

Indicated color of mode now selected : Green and Red

Indicated color of other modes

: White

Green : Normal

Red :

The microcomputer operates to provide judgement

of no video signal. The red color is still indicated

though the signal is input, failure may exist in input

signal line including QV01.

QV01 : In case of indication green ---Normal

In case of indication red with input signal----

Failure may exist in output line including QV01.

NOTE: Component which controls character display on

screen is QT01 (TELETEXT IC.). If this display

function fails to operate due to damage in QT01,

self diagnosis procedure is as follows.

(1) In case that on timer indicator is blinking with

interval of 0.5 seconds; it means protecting cir-

cuit (Current limiter) is operating, and circuit

components may possibly be damaged. Check

related components.

* The items marked with

are not usable to display in the SELF DIAGNOSTIC FUCTION for some model.

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