Agilent Technologies N9039A Service Manual page 66

Troubleshooting
A7 Midplane Board Assembly
Table 2-3 A7 Midplane Board LEDs and Test Points
LED Description
PS Fault Power Supply
Fault
Power OK Digital Supplies
OK
Power On Power Supply
Enable
a. With AC mains connected to the instrument
66
Reference Regulated
Point On
ACOM A6
DCOM A6
DCOM A4
Expected Status
a
Power Off
LED Test Point
(VDC)
Off TTL High Off
Red TTL Low Off
Off TTL High Green
Power On
LED Test Point
(VDC)
TTL High
TTL High
TTL Low
Chapter 2