Agilent Technologies XX3625 Service Manual page 92

Chapter 5: Troubleshooting
Power Supply Trouble Isolation
Reconnect Assemblies and Cables
Reconnect all assemblies after testing. The oscilloscope must have all cables connected for correct power
up.
If you want to test the power supply without any assemblies connected, the +5 V supply must be loaded
to 2 A. Use two 5 Ω , 10W resistors between the +5 V output and ground.
Table 5-4 Power Supply Distribution
Assembly
Acquisition
Motherboard
Probe Power &
Control
Front-Panel
Keyboard
Scope Interface
Board
Display Board
Backlight
Inverter
Flat Panel
Display
Floppy Disk Drive
Hard Disk Drive
Figure 5-4
Power-up Sense Resistor Connection
+5.1 V -5.2 V Ground
X X X
X X X
X X
X X
X X
X X
X
X X
X X
X X
+12.2 V -12.2 V 3.3 V (generated on Motherboard)
X X
X X X
X X
X
X X X
X
X
Ω