JVC AV-29LS2 Service Manual page 25

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
Over-current protection
CRT NECK protection
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.
[ Indication by the LEDs]
Item
1 Over-current protection
2 CRT NECK protection
Note: In case of 1 + 2, the item 1 is indicated.
Details of detection
An over-current on the low B line
is detected.
Operation of CRT NECK protec-
tion circuit
LEDs flashing intervals
At 0.2-second intervals
At 1-second intervals
No. 52062
Method of detection
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
After about
5 seconds
Start of
Power on
detection
AV-29LS2
AV-29LX2
AV-2968TEE
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
Priority of detection
1
2
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