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Sharp PN-K321 Service Manual

Sharp PN-K321
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PN-K321/K322B TROUBLESHOOTING 7 - 1
CHAPTER 7. TROUBLESHOOTING
No Description
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)
5 CANNOT CONTROL RS-232C CONNECTION
6 THE RED LED BLINKS
7 THE LED LIGHTS UP IN ORDER OF RED -> GREEN -> RED -> GREEN
8 IMPLEMENTING COUNTERMEASURES TO DEFECTIVE PARTS
1. THE POWER IS NOT SUPPLIED (THE LED DOES NOT LIGHT UP)
:’13/Dec
No
Is the AC cord inserted to AC adaptor properly? Insert the AC cord to AC adaptor properly.
Yes
No
Is the DC jack properly inserted? Insert the AC cord or DC jack properly.
Yes
Is the power SW turned ON?
Is the power SW free from any abnormality?
Abnormality found. Replace the abnormal part.
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?
Abnormality found. Replace AC adaptor.
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?
No Replace DC-DC PWB unit.
Yes
Check the Main I/F PWB and the related parts listed below
for any abnormality:
Abnormality found.
- Power cable Replace the abnormal part.
- Fuses F3200, F3201, F3202 (Are they blown out?) Replace the Main I/F PWB.
- 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
Abnormality found.
- Connection cable Replace the abnormal part.
- Key PWB Replace the Switch PWB.
[Caution]
If no signal is being input, the power-save function will
be activated that the output is blocked in a few
seconds.

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Sharp PN-K321 Specifications

General IconGeneral
BrandSharp
ModelPN-K321
CategoryMonitor
LanguageEnglish

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