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:'13/Dec
CHAPTER 7. TROUBLESHOOTING
No
1
THE POWER IS NOT SUPPLIED (THE LED DOES NOT LIGHT UP)
2
THE DISPLAY DOESN'T SHOW/ DISPLAY ABNORMALITY
3
THE BACKLIGHT DOES NOT LIGHT UP
4
SOUND IS NOT REPRODUCED/ REPRODUCED SOUND ABNORMALITY (PROBLEM
WITH MAIN UNIT)
CANNOT CONTROL RS-232C CONNECTION
5
THE RED LED BLINKS
6
THE LED LIGHTS UP IN ORDER OF RED -> GREEN -> RED -> GREEN
7
IMPLEMENTING COUNTERMEASURES TO DEFECTIVE PARTS
8
1. THE POWER IS NOT SUPPLIED (THE LED DOES NOT LIGHT UP)
Is the AC cord inserted to AC adaptor properly?
Yes
Is the DC jack properly inserted?
Yes
Is the power SW turned ON?
Is the power SW free from any abnormality?
No abnormality found.
Is the input voltage (approx. 19.5V) input to the input
connector CN1 on DC-DC PWB unit from the AC adaptor
properly?
No abnormality found.
Are the powers BU5V (approx. 5V), MAIN12V (approx. 12V),
BKLTPOW19.5V (approx. 19.5V) and LCD12V (approx.
12V), output from the connector on DC-DC PWB unit?
[Caution]
If no signal is being input, the power-save function will
be activated that the output is blocked in a few
seconds.
Yes
Check the Main I/F PWB and the related parts listed below
for any abnormality:
- Power cable
- Fuses F3200, F3201, F3202 (Are they blown out?)
- RS232C communication (Is it capable of communicating
using RS232C?)
- Main I/F PWB
No abnormality found.
Check the Key PWB and the related parts listed below for
any abnormality
- Connection cable
- Key PWB
Description
No
No
Abnormality found. Replace the abnormal part.
Abnormality found. Replace AC adaptor.
No
Abnormality found.
Abnormality found.
PN-K321/K322B TROUBLESHOOTING 7 - 1
Insert the AC cord to AC adaptor properly.
Insert the AC cord or DC jack properly.
Replace DC-DC PWB unit.
Replace the abnormal part.
Replace the Main I/F PWB.
Replace the abnormal part.
Replace the Switch PWB.
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