Agilent Technologies 6612B, Service Manual, Page: 23 / 74

Troubleshooting - 3
23
Disconnect power, and
all loads then remove
cover. Set sense
switch to local,
reconnect power and
turn unit on.
Is Display on? Is Fan on?
No
1. Check ac input and line cord.
2. Check line fuse.
3. Check line voltage selection,
see Fig. 3-3.
4. Check ac and bias voltages,
see Table 3-3.
No
Is Fan on?
Yes
24V @ Q305-2
?
No
Check +15V Unreg
bias circuit
Check fan and Fan
Driver circuit
No
Yes
Error Message
displayed?
Yes
See Self Test Error
Codes, Table 3-2
Yes
Program full scale
voltage and current
and enable output.
Check the output
voltage with a DMM.
No
Go to sheet 2
Go To "No Display",
Sheet 5, "A"
Yes
Figure 3-1 Sheet 1. Main Flowchart