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TROUBLESHOOTING GUIDE
Reset or Power Check.
No Reset or No Power ON.
Are the pin 4
and 1 of CN303 +5V and +12V
respectively after the power
cable
connecting?
YES
Is the pin 4 of IC851 3.9V?
YES
Is the pin 4 of IC102 3.3V?
YES
Are the X201,
X202 and X501
oscillating?
YES
Does the pin 63
of IC202 change 0V to 5V at
the power supply initial input
mode?
YES
OK
(Check it after connecting the power cable only on interface cable)
NO
¥
Check the power short.
¥
Check PC power cable, power
supply and fuse.
NO
Replace IC851 (3.9V Regulator).
NO
Replace IC102 (3.3V Regulator).
NO
Replace X201, X202 and X501 when
the power supply of IC202, IC214
and IC215 is OK.
NO
Replace IC202 when the IC101
(RESET IC) is OK.
Repair PC power supply.
53
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