Advertisement
AV-27920
SELF CHECK FUNCTIONS
1. Outline
This model includes a CRT (Cathode Ray Tube) NECK protector function which cuts off the power in the event of a malfunction and
informs 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 indicating function
The CRT NECK protector function begins detection about 5 seconds after
power is supplied. In the event a malfunction is detected, the power is cutoff
immediately. At this time, the ON-TIMER LED flashes.
POWER
About 5 sec.
Malfunction
supplied
after
is detected
[LED indication]
The ON-TIMER LED flashes at 0.5 second intervais.
POWER OFF
Detection
Start
Flashing
ON-TIMER LED
3. Contents of Self check
|
Checkitem
|
Detected contents
Detection method
Abnormality state
CRT NECK protector
When
the
vertical
circuit
S- | The main CPU detects at 1 second | During an abnormality the power is
Also detected
if the
correction
capacitor
C427
is | intervals.
If NG
is detected
for | cutoff.
power
supply
line
shorted, detect the potential drop | more than 1 ms, a malfunction is | The remote controller power key
output from the HVT
of the C427, and prevent the burn | interpreted.
operation
is not recognized and
(High
voltage
damage to the CRT NECK.
power off is maintained until the
Transformer)
has
(Grounding
of shorting
of
the
power
cord
is unplugged
and
shorted
with
the
power supply output from the HVT
reinserted.
ground.
to the vertical circuit, and the small
signal
power
supply
is
also
detected.)
22
No.51370
Advertisement
