Read Sharp PN-E702 (serv.man3) Service Manual online
CHAPTER 7. TROUBLESHOOTING
PN-E702/E602 TROUBLESHOOTING
7 – 2
1. THE POWER IS NOT SUPPLIED (THE LED DOES NOT LIGHT UP)
Is the AC cord properly inserted?
No
Insert the AC cord properly.
Is the power SW turned ON?
Is the power SW free from any abnormality?
Is the power SW free from any abnormality?
No
Replace the abnormal part.
Replace the main power PWB unit.
Yes
Replace the abnormal part.
Replace the main PWB.
Replace the main PWB.
No abnormality
No abnormality
Is the fuse of AC Relay PWB (F1, F2) blown?
Replace the defective part.
No abnormality
Abnormality
No abnormality
Abnormality
Abnormality
If the signal input is not supplied, the power save
function is operated to interrupt the output of
UR13.2V/PNL12V from the sub power source.
function is operated to interrupt the output of
UR13.2V/PNL12V from the sub power source.
Check the power cable.
Check the fuse (F103) for breakage.
Can it communicate via RS232C/LAN?
Check the main PWB.
Check the fuse (F103) for breakage.
Can it communicate via RS232C/LAN?
Check the main PWB.
Check the main PWB and the related parts for any
abnormality.
abnormality.
CAUTION
Replace the abnormal part.
Replace the key PWB.
Replace the key PWB.
Check the key PWB and the related parts for any
abnormality.
Check the connection cable.
Any problem with the key PWB?
abnormality.
Check the connection cable.
Any problem with the key PWB?
Abnormality
Is 5V outputted from CN200 on the 5V power unit ?
Replace the 5v power unit.
No abnormality
No
Are BU5V and 13.5V outputted from connector: PD on
the main power unit, and LCD12V from CN301, and
INV24V from CN401/402?
the main power unit, and LCD12V from CN301, and
INV24V from CN401/402?
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