E8257D/67D, E8663D PSG Signal Generators Service Guide 77
Troubleshooting
Troubleshooting Assembly–Level Problems
4. If the voltages are present on the A31 Motherboard, turn power off,
remove the A18 CPU and inspect the connector. If the pins look good,
replace the A18 CPU.
5. If a supply voltage is not present on the connector, measure the
appropriate point listed in the following table:
6. If the voltage is present on P112 but not present on P223, replace the A31
Motherboard.
7. If the voltages are not present on P112, troubleshoot the A9 YIG Driver.
Self–Tests 12xx: A26 MID Self–Test Errors (E8257D)
Before proceeding to the reported self–test error code, check the following
voltages in. If any of these voltages are out of specification, troubleshoot the
supply problem first.
Connector P112 Supply Voltage Voltage Range
Pin 1, 2, 26, 27 –5.2 Vdc –5.2 ± 0.1 Vdc
Pin 19, 44 –6 Vdc –6 ± 0.12 Vdc
Pin 17, 18, 42 +9 Vdc +9 ± 0.18 Vdc
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