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TROUBLESHOOTING GUIDE
Are the pin 44 of
CN271+5V, pin41 of CN271+12V
respectively after the power cable
connecting?
Reset or Power Check.
•
Check the power(5V/12V) short.
•
Check the PC power cable.
•
Repair the PC power supply.
•
Check the IC401(3.3V regulator IC).
•
Check the IC201, IC121.
Does the pin #1
(Reset) of IC271 change 0V to 3.3V
at the power supply initial input
mode?
<Power>
•
Is the pin 5 of IC401 3.3V?
<Reference>
•
1.65V(VREF) : Check pin113 of IC121?
•
2.2V(HDVREF): Check pin78 of IC121
NO
NO
YES
YES
YES
YES
75
Are the X201 oscillating?
•
Check the X201(16.9MHz).
•
Check the IC201.
NO
•
Check the IC401.
NO
•
Check the IC121.
NO
Check it after connecting the power cable
only on interface cable for NO Reset or
Power ON.
YES
OK
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