Troubleshooting - JVC RM-C1305-1H 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 flash 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 protection
5.1.3 SELF CHECK INDICATING FUNCTION
When an abnormality has been detected at about 5 seconds
after the power is turned on, the SUB POWER is turned off
immediately and the LED flash.
[ INDICATION BY THE POWER LED]
Item
[1] B1 over-current protection
[2] CRT neck protection
Note: In case of [1] + [2], the item [1] is indicated.
SECTION 5

TROUBLESHOOTING

Details of detection
An over-current on the low
B1 line is detected.
Operation of CRT neck
protection circuit
LED flashing intervals
At 0.2-second intervals
At 1-second intervals
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 30-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.
DITTO
After about
5 seconds
Start of
Power on
detection
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 taken out
and put in again.
DITTO
Detection of
an abnormality
Flashing LED
SUB-POWER OFF
Priority of detection
1
2
(No. 52176) 1-31