Troubleshooting - JVC AV-29WX14/G Service Manual

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
Check item
B1 over-current protection
CRT neck broken protection
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]
B1 over-current protection /
CRT neck broken portection
SECTION 5

TROUBLESHOOTING

Details of detection
An over-current on the low
B1 line is detected.
Operation of CRT neck
protection circuit
Item
Method of detection
The main microcomputer
d e t e c t s t h e p o s s i b l e
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.
After about
5 seconds
Start of
Power on
detection
Port
LED flashing intervals
0.3 seconds
State of 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.
Detection of
an abnormality
Flashing LED
SUB-POWER OFF
(No. YA104) 1-33