Sharp PN-K321H

PN-K321/K322B TROUBLESHOOTING 7 - 4
6. THE RED LED BLINKS
7. THE LED LIGHTS UP IN ORDER OF RED -> GREEN -> RED -> GREEN
(TEMPERATURE ERROR)
:’13/Dec
Display check result with particular operation or by the
execution of particular RS232C command to specify the
error position.
Error position
confirmed.
Is there any abnormality in the error position?
Such as:
- Power failure
- Blown fuses F101 / F102
䚷
No error position confirmed. - Connection cable failure
Abnormality found.
Check the DC-DC PWB unit for any abnormality. Replace DC-DC PWB unit.
䚷
No abnormality found.
Abnormality found.
Check the LED driver PWB unit for any abnormality Replace LED driver PWB unit.
䚷
No abnormality found.
Check the Switch PWB and the related parts listed below
for any abnormality
Abnormality found.
- Connection cable Replace the abnormal part.
- Switch PWB Replace the Switch PWB.
䚷
No abnormality found.
- Check the Main I/F PWB and the related parts listed
below for any abnormality:
Abnormality found.
- Connection cable Replace the abnormal part.
- Main I/F PWB Replace the Main I/F PWB.
No
Is the unit properly installed under proper environment? Check the installation requirements.
䚷
Yes
Yes
Is the vent blocked? Remove the obstacles.
䚷
No
Display check result with particular operation or by the
execution of particular RS232C command to specify the
error position.
Error position
confirmed.
Is there any abnormality in the error position?
䚷
Yes
䚷
No error position confirmed. Replace the abnormal part.
Replace the Main I/F PWB.
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 I/F PWB.
䚷
No abnormality found.
Check the Main I/F PWB and the related parts listed below
for any abnormality:
Abnormality found.
- Connection cable Replace the abnormal part.
- PWB Replace the Main I/F PWB.
*1
䚷
Implementing countermeasure to defective parts
1:Input of 12V-voltage to the panel
2:Input of 24V-DC
3:Input of 12V-voltage to the speaker
4:Input of 5V-voltage to the Main power supply unit
Backlight: LED error