Trouble Shooting; Main Board - Buffalo FTD-G931AS Service Manual

7.Trouble Shooting

7.1 Main board

No power
Please reinsert and make sure
the AC of 100-240 is normal
No picture (LED orange)
No power
Press power key and look
if the picture is normal
NG OK
NG
OK
Measure U201 PIN2=1.8V
U202 PIN2=3.3V
NG
OK
X401 and X601 oscillate
waveforms are normal
NG
OK
Replace U601
NG
Replace U401
OK
Reinsert or check
the power section
Check Correspondent
component.
Check Correspondent
component.
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BUFFALO FTD-G931AS/BK