JVC AV-14F13/PH Service Manual page 30

AV-14F13
AV-14F33
SELF CHECK FUNCTIONS
1. Outline
This model includes protector functions for Over-current, X-ray and CRT NECK which cutoff the sub-power in the event of a malfunction and
inform of the malfunction by flashing ON TIMER LED.
The malfunction is detected according to the state of the control line input connected to the main CPU.
2. Self check items
Check item
Over-current protector
X-ray protector
CRT NECK protector
3. Self check indicating function
The self check function begins detection about 5
seconds after power is supplied.
In the event a malfunction is detected, the sub-power is
cutoff immediately.
At this time, the ON TIMER LED flashes to inform of
the malfunction.
Item
OCP/X-ray
NECK
30
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Detected contents
An over-current on the B1 line
and Audio-Vcc line is detected.
[ AV-14F13/PH ]
An over-current on the B1 line is
detected. [ AV-14F33/PH ]
Operation of X-ray protection
circuit
When the vertical circuit S-
correction capacitor C413 is
shorted, detect the potential
drop of the C413, and prevent
the burn damage to the CRT
NECK.
POWER
supplied
LED ON / OFF intervals
every 0.5-second
every 1.0-second
No.52021
Detection method
The main CPU detects at
1 second intervals.
If NG is detected for more than
1 ms, a malfunction is interpreted.
The main CPU detects at
1 second intervals.
If NG is detected for more than
1 ms, a malfunction is interpreted.
The main CPU detects at
1 second intervals.
If NG is detected for more than
1 ms, a malfunction is interpreted.
About 5 seconds
after
Detection
start
Abnormality state
During an abnormality the sub-
power is cutoff. The remote
controller power key operation is
not recognized and sub-power
off is maintained until the power
cord is unplugged and
reinserted.
During an abnormality the sub-
power is cutoff. The remote
controller power key operation is
not recognized and sub-power
off is maintained until the power
cord is unplugged and
reinserted.
During an abnormality the sub-
power is cutoff. The remote
controller power key operation is
not recognized and sub-power
off is maintained until the power
cord is unplugged and
reinserted.
Malfuction is
detected
SUB-POWER OFF
Flashing
ON TIMER LED
Priority of detection
1
2