3-2
FWD-50PX1
3-2. Self Diagnosis Function
3-2-1. Overview
The self-diagnosis function of this model detects abnor-
mality by checking the power voltages, detecting tempera-
ture, detecting operation of fans and by checking EE-
PROM register and the watch timer using the A/D convert-
er. When any abnormality is detected, the self-diagnosis
function displays the abnormality by flashing the Standby
indicator and displays the detected data on the service
menu.
If the abnormal condition exceeds the allowable limit, it
forcibly activates the shutdown operation.
The self-diagnosis function detects the following items.
1.
Detecting stoppage of fans and shutting it down, and
detecting failure of the fan drive circuit
2.
Detecting temperature increase of the power supply
block and shutting it down
3.
Detecting temperature at the sensor board
4.
Detecting the communication error with each device
5.
Detecting the EEPROM error
6.
Detecting decrease of the watch backup power voltage
and detecting abnormal oscillation
7.
Detecting chroma decoder initialization error
8.
Detecting abnormal voltage of the internal power
supply and shutting power supply down
9.
Detecting abnormal power-off sequence
If any abnormality is detected, the Standby indicator
flashes at the interval of 0.4 seconds continuously.
At the same time, the corresponding item shows the NG
indication in the service menu.
The NG indication is not reset and is accumulated unless
the AC cord is disconnected.
If the abnormal condition exceeds the allowable limit, it
forcibly activates the shutdown operation and picture will
not be displayed any more.
At this time, the Standby indicator flashes to indicate that
the PDP unit is in the error mode as shown in Section 3-1.
Service Mode
Service Status
Fan & Temp Status
Fan Drive
:
OK
(1)
Fan
:
OK
(2)
P/S Temp
:
OK
P/S Temp
:
44[
d
C]
NO ACK DEV
:
0004
Service Mode
Service Status
Fan & Temp Status
Fan Drive
:
OK
Fan
:
OK
P/S Temp
:
OK
(1)
P/S Temp
:
44[
d
C]
NO ACK DEV
:
0004
3-2-2. Abnormality Judgment Criterion
1. Detecting stoppage of fans and shutting it
down, and detecting failure of the fan drive
circuit
(1) Fan Drive: When the fan drive circuit is in normal
operation, “OK” is displayed.
(2) Fan:
When all the four built-in fans are in
normal operation, “OK” is displayed.
If the fan drive circuit is defective or if any
of the built-in fans stops its rotation, the
shutting down is activated.
2. Detecting temperature increase of the power
supply block and shutting it down
(1) P/S Temp: If temperature inside the power supply
block exceeds 66
d
C, “NG” is displayed
and the Standby indicator flashes at the
interval of 0.4 seconds continuously. If
temperature exceeds 71
d
C, the shutting
down is activated.
Summary of Contents for FWD-50PX1 (English: pgs. 52-97)
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Page 107: ...9 5 FWD 50PX1 9 5 Q Q A 1 2 3 4 B C D E F G H Q B SIDE SUFFIX 11 ...
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