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Troubleshooting
Troubleshooting Assembly–Level Problems
Self–Tests 9xx: A10 ALC Self–Test Errors
Before proceeding to the reported self–test error code, check the following voltages. If
any voltages are out of specification troubleshoot the supply problem first.
900 Power Supply
• Replace the 10 ALC.
Supply
Voltage
(Vdc)
Connector Pins Minimum
Value
(Vdc)
Maximum
Value
(Vdc)
Origin
+32 P122-4 +31.04 +32.96 Main Supply
+15 P122-28 +14.55 +15.45 Main Supply
–15
P122-3,
–14.55 –15.45
Main Supply
+5.2 P122-2, 27 +5.04 +5.37 Main Supply
–5.2
P122-1, 26 +5.04 +5.37 Main Supply
+5.2 Digital high P121-64, 65, 129, 130 +5.04 +5.36 Main Supply
+3.4 Digital Low P121-60, 61, 62, 63, 125, 126, 127, 128 +3.29 +3.5 Main Supply
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