Agilent Technologies N9039A Service Manual page 65

Power Supply assembly. This is used to frequency modulate the power supply
switching frequency for the purpose of lowering any power supply related
interference.
If for some reason the level of the power supply related interference is higher than
normal this circuitry, or the A6 Power Supply assembly, could be suspect.
Table 2-3 A7 Midplane Board LEDs and Test Points
LED Description
+32V A +32 Volt Analog
Supply
+15V A +15 Volt Analog
Supply
+15V STBY +15 Volt
Standby Supply
+12V D +12 Volt Digital
Supply
+9V A +9 Volt Analog
Supply
+5.1V A +5.1 Volt
Analog Supply
+5.1V D +5.1 Volt Digital
Supply
+5.1V STBY +5.1 Volt
Standby Supply
+3.35V D +3.35 Volt
Digital Supply
-7V A -7 Volt Analog
Supply
-15V A -15 Volt Analog
Supply
Fan P Fan Positive
Voltage
+3.3V A +3.3 Volt
Analog Supply
-5.2V A -5.2 Volt Analog
Supply
Chapter 2
Reference Regulated
Point On
ACOM A6
ACOM A6
ACOM A6
DCOM A6
ACOM A6
ACOM A6
DCOM A6
DCOM A6
DCOM A6
ACOM A6
ACOM A6
ACOM A6
ACOM A7
ACOM A7
A7 Midplane Board Assembly
Expected Status
a
Power Off
LED Test Point
(VDC)
Red 0 Off
Red 0 Off
+15 ± 1.0
Green Green
Red 0 Off
Red 0 Off
Red 0 Off
Red 0 Off
+5.1 ± 0.75
Green Green
Red 0 Off
Red 0 Off
Red 0 Off
Red 0 Off
Red 0 Off
Red 0 Off
Troubleshooting
Power On
LED Test Point
(VDC)
+32 ± 2.0
+15 ± 1.0
+15 ± 1.0
+12 ± 1.0
+9 ± 1.0
+5.1 ± 0.75
+5.1 ± 0.75
+5.1 ± 0.75
+3.35 ± 0.75
-7 ± 1.0
-15 ± 1.0
9.2 - 14.5
+3.35 ± 0.75
-5.2 ± 0.75
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