No. 51831
C-N14210
23
SELF CHECK FUNCTIONS
1. Outline
This model has self check functions given below. When a malfunction has been detected, the 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
Details of detection
Method of detection
State of malfunction
CRT NECK protector
Also detected if the
power supply line output
from the HVT (High
voltage Transformer) has
shorted with the ground.
When the vertical circuit S-
correction capacitor C427
is shorted, detect the
potential drop of the C427,
and prevent the burn
damage to the CRT NECK.
(Grounding of shorting of
the power supply output
from the HVT to the vertical
circuit, and the small signal
power supply is also
detected.)
The microcomputer detects at 1-
second intervals.
If NG is detected for more than 1
ms, a malfunction is interpreted.
When a malfunction has been
detected, the POWER is turned
off. While the POWER is being
turned off, the power key of the
remote controller is not operational
until the power code is taken out
and put in again.
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 power is cut off
immediately.
At this time, the ON-TIMER LED flashes to inform of the
malfunction.
[ON-TIMER LED indication]
The ON-TIMER LED flashes at 0.5 seconds intervals.
POWER
Supplied
After about
5 seconds
Malfunction
is detected
POWER OFF
Flashing
ON-TIMER LED
Start of
detection
