(No.YA465)1-29
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
microcomputer.
5.1.2 SELF CHECK ITEMS
5.1.3 SELF CHECK INDICATING FUNCTION
When an abnormality has been detected at about 5 seconds
after the power was turned on, the SUB POWER is turned off
immediately 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
detects 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-
POWER is being turned off, the
POWER key on the remote
control unit is not operational
until the power cord is
disconnected and connected
again.
CRT neck broken protection
Operation of CRT neck
protection 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
