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Protection Block
Overview
The RA-4 chassis employs a Self-Diagnostic system that uses the Timer
LED and an on screen menu to help indicate where the problem with the
set has occurred. Generally you will have to use the flashing LEDs since
the set will be shut down. In order to turn the set off once shutdown has
occurred, AC power must be disconnected.
Diagnostic Indication
When a problem occurs that causes shutdown, the Timer LED may blink
in a pattern as shown below:
< FRONT PANEL >
TIMER/STANDBY indicator
<Number of Blinks>
2 times
3 times
4 times
Lamp ON : 0.3 seconds
Lamp OFF : 0.3 seconds
•EXAMPLE
<Diagnosis Items>
• +B overcurrent
• +B overvoltage
• Vertical deflection stop
Lamp OFF :
3.0 seconds
127
The number of times the LED blinks may correspond to that shown in the
following table:
Diagnosis item
• Power not ON
+B OCP detection
+B OVP detection
V detection
AKB detection
H detection
HV abnormality detection
Audio abnormality detection
: XX the range of values for number of operations is 00-99. For 99 or higher there is no count up
*
and the number remains at 99.
If the problem is intermittent and you can get the set to operate, you can
display a menu showing the number of times failures have occurred. This
is done by pressing the following sequence of buttons on the remote.
Display Channel 5 Vol - Power
The display will look as follows.
SELF CHECK
2 : +B OCP
XX
3 : +B OVP
XX
4 : V STOP
XX
5 : AKB
XX
6 : H STOP
XX
7 : HV
XX
8 : AUDIO
XX
9 : WDT
XX
Standb y/
Self-diagnosis
sleep lamp,
screen displa y ,
Number of b links
Diagnosis item: Results
Not lit
LED blinks 2 times
2 : +B OCP
LED blinks 3 times
3 : +B OVP
LED blinks 4 times
4 : V STOP
LED blinks 5 times
5 : AKB
LED blinks 6 times
6 : H STOP
LED blinks 7 times
7 : HV
LED blinks 8 times
8 : AUDIO
2 : +B OCP
XX
XX the range of values for number of
operations is 00-99.
For 99 or higher there is no count up
Diagnosis
and the numberremainsat 99.
Results
XX
XX
XX
XX
XX
XX
XX
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Troubleshooting
