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SELF CHECK FUNCTIONS
1. Outline
This model has self check functions given below. When a malfunction has been detdcted, the SUB-POWER is turned off and the LED
flashes to inform of the failure. The malfunction is detected by the signal input state of the control line connected to the microcomputer.
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 POWER/ON TIMER LED flashes to
inform of the malfunction.
Item
OCP/X-ray
NECK
" Because OCP and X-ray protectors are inputted to the same pin in the microcomputer, the judgement will be logical sum (OR).
Detected contents
Operation of over-current
protection circuit
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 flashing intervals
At 0.5 – second intervals
At 0.5 – second intervals
No. 51731
Detection method
The microcomputer detects at 1
second intervals.
If NG is detected for more than 1
ms, a malfunction is interpreted.
The microcomputer detects at 1
second intervals.
If NG is detected for more than 1
ms, a malfunction is interpreted
The microcomputer detects at 1
second intervals.
If NG is detected for more than 1
ms, a malfunction is interpreted
About 5 seconds
after
Detection
start
AV-29M201
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
POWER /
ON TIMER LED
Priority of detection
1
2
25
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