No.52021
AV-14F13
AV-14F33
30
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
Detected contents
Detection method
Abnormality state
Over-current protector
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 ]
The main CPU detects at
1 second intervals.
If NG is detected for more than
1 ms, a malfunction is interpreted.
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.
X-ray protector
Operation of X-ray protection
circuit
The main CPU detects at
1 second intervals.
If NG is detected for more than
1 ms, a malfunction is interpreted.
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.
CRT
NECK
protector
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.
The main CPU detects at
1 second intervals.
If NG is detected for more than
1 ms, a malfunction is interpreted.
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.
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
LED ON / OFF intervals
Priority of detection
OCP/X-ray
every 0.5-second
1
NECK
every 1.0-second
2
About 5 seconds
after
Malfuction is
detected
Detection
start
SUB-POWER OFF
Flashing
ON TIMER LED
POWER
supplied
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