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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.
<SELF CHECK>
2300****
POWER
: 00
BUS CONT : OK
BLOCK
: UV V1 V2 V3
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
UV : TV reception mode
V1
: VIDEO 1 input mode (a1)
V2
: VIDEO 2 input mode (a2)
V3
: VIDEO 3 input mode (a3)
*
The items marked with
QV01
are not usable to display in the SELF DIAGNOSTIC FUCTION for some model.
Indicated color of mode now selected : Green and Red
Indicated color of other modes
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.
– 12 –
: White
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