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SELF-CHECK FUNCTIONS
1. Outline
This model has self-check functions given below. When an abnormality has been detected, the SUB POWER is turned off and both
POWER and ON TIMER LEDs flash to inform of the failure. An abnormality is detected by the signal input state of the control line
connected to the microcomputer.
2. Self-check items
Check item
Over-current protection
CRT NECK protection
3. Self-check indicating function
When an abnormality has been detected at about 3 seconds
after the power is turned on, the SUB POWER is turned off
immediately and the POWER and ON TIMER LEDs flash.
[ Indication by the LED ]
Item
Over-current and CRT NECK protection
Details of detection
An over-current on the low B line
is detected.
Operation of CRT NECK protec-
tion circuit
LED flashing intervals
At 0.24-second intervals
No. 56055
Method of detection
The main microcomputer detects
the possible abnormality at 20-
msec. intervals and judges the re-
sults in every 24 time. Of the 24
times, if NG is detected more
than 13 times, it is judged that
there is an abnormality.
DITTO
After about
3 seconds
Start of
Power on
detection
AV-21PM
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 con-
trol unit is not operational until the
power cord is taken out and put
in again.
DITTO
Detection of
an abnormality
Flashing LEDs
SUB-POWER OFF
27
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