Installation guide

Troubleshooting
Troubleshooting Assembly Level Problems
1-67
2100 Power Supply
• If the supply voltages are good on the connector pins indicated, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
• If the supply voltages are bad on the connector pins indicated:
a. Check the origin of the supply.
— If the supply voltage is good at the origin, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
— If the supply voltage is bad at the origin, troubleshoot the problem using that assembly's
troubleshooting procedure.
2101 Sweep Diag
• Replace the A23 Motherboard.
2102 LCD Bias
• Use a DVM to probe A23J15-35 for a signal of approximately 21 Vdc.
— If the voltage is good, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
— If the voltage is bad, troubleshoot the A12 CPU.