32
No. 52075
AV-21W33
AV-21W33B
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 ECO 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
Details of detection
Method of detection
State of abnormality
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 LEDs flash.
Over-current protection
CRT NECK protection
An over-current on the low B line
is detected.
Operation of CRT NECK protec-
tion circuit
The main microcomputer detects
the possible 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
When an abnormality has been
detected, the SUB-POWER is
tur ned 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
[ Indication by the LEDs]
Item
LEDs flashing intervals
Priority of detection
1
Over-current protection
At 0.2-second intervals
1
2
CRT NECK protection
At 1-second intervals
2
Note:
In case of
1
+
2
, the item
1
is indicated.
After about
5 seconds
Power on
Start of
detection
Detection of
an abnormality
SUB-POWER OFF
Flashing LEDs
