312 N9030B PXA Signal Analyzer Service Guide
Power Supply/Midplane Troubleshooting
A7 Midplane Board Assembly Troubleshooting
POWER_OK Digital Supplies OK DCOM A6 Red TTL Low Off TTL High
POWER_ON_L Power Supply Enable DCOM A4 Off TTL High Green TTL Low
POWER_SW_L Power Switch
Pressed
ACOM A4 n/a TTL High Green
TTL High
b
a. With AC mains connected to the instrument
b. POWER_SW_L should only be at a TTL Low state when the front panel power switch is being pressed
Table 10-3 A7 Midplane Board LEDs and Test Points
Supply/
Signal
Description Referenced
To
Generated
On
Expected Status
Power Off
a
Power On
LED Test Point
(VDC)
LED Test Point
(VDC)
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