Toshiba CN27E90 Technical Training Manual page 37

4. UNDERSTANDING SELF DIAGNOSIS INDICATION
In case that phenomenon always arises. See figure 3-4 .
Item
BUS LINE Detection of bus line short
BUS CONT Communication state of bus line
BLOCK:BS The sync signal part in
UV1 each video signal supplied from
UV2 each block is detected.
V1 Then by checking the existence or
V2 non of sync part, the result of self
diagnosis is displayed on screen.
Besides, when "9" key on remote
unit is pressed,diagnosis operation
is first executed once.
<Clearing method of self diagnosis result>
In the error count state of screen, press "CHANNEL DOWN" button on TV set pressing "DISPLAY" button on
remote unit.
[CAUTION]
All ways keep the following caution, in the state of
service mode screen.
• Do not press "CHANNEL UP" button. This will cause
initialization of memory IC. (Replacement of memory IC is
required.
• Do not initialize self diagnosis result. This will change user
adjusting contents to factory setting value. ( Adjustment is
required.)
<Method utilizing inner signal> (VIDEO INPUT 1 terminal should be open.)
(1) With service mode screen, press VIDEO button on remote unit. If inner video signal can be received, QV01 and after are normal.
(2) With service mode screen, press "8" button on remote unit. If sound of 1kHz can be heard, QV01 and after are normal.
* By utilizing signal of VIDEO input terminal, each circuit can be checked. (Composite video signal, audio signal)
Contents
Note 1. The indication of failure place is only one place
*Indication by color
Instruction of results
Indication of OK for normal result, NG for abnormal
Indication of OK for normal result
Indication of failure place in abnormality
(Failure place to be indicated)
QA02 NG, H001 NG, Q501 NG, H002 NG
QV01 NG, Q302 NG, QY02 NG, HY01 NG
QD04 NG, QM01 NG, Q701 NG
though failure places are plural. When repair of a
failure place finishes, the next failure place is indi
cated. (The order of priority of indication is left side.)
• Normal block
• Non diagnosis block : Cyan
White
Yellow
Cyan
( COLOR BAR SIGNAL)
Color elements are positioned in sequence of high brightness.
37
: Green
Green
Magenta
Red
Blue