1-28 (No.YA552)
SECTION 5
TROUBLESHOOTING
5.1 SELF CHECK FUNCTIONS
5.1.1 OUTLINE
This model has self check functions given below. When an abnormality has been detected, the SUB POWER is turned off and POWER
LED flashes to inform of the failure. An abnormality is detected by the signal input state of the control line connected to the microcom-
puter.
5.1.2 SELF CHECK ITEMS
5.1.3 SELF CHECK INDICATING FUNCTION
When an abnormality has been detected at about 5 seconds af-
ter the power was turned on, the SUB POWER is turned off im-
mediately and the POWER LED flashes.
[ INDICATION BY THE POWER LED]
Check item Details of detection Method of detection State of abnormality
B1 over-current protection An over-current on the low B1
line is detected.
The main microcomputer de-
tects the possible abnormality at
24-msec. intervals and judges
the results in every 16 time. Of
the 16 times, if NG is detected
more than 9 times, it is judged
that there is an abnormality.
When an abnormality has been
detected, the SUB-POWER is
turned off. While the SUB-POW-
ER is being turned off, the
POWER key on the remote con-
trol unit is not operational until
the power cord is disconnected
and connected again.
CRT neck broken protection Operation of CRT neck protec-
tion circuit.
After about
5 seconds
Power on
Start of
detection
Detection of
an abnormality
SUB-POWER OFF
Flashing LED
Port
Item LED flashing intervals
B1 over-current protection / CRT neck broken protection 0.3 seconds
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