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Service Addendum 11
Overall Troubleshooting (sheet 3)
Did OV occur?
D
From Sheet 3
Turn off the supply and remove the short from the
output. Turn on and program output voltage and
current to full scale and the OV to zero using front
panel keys. Check that the supply goes into OV
condition (OV Prot annunciator on and output at 0)
Go to "OV Will Not Fire"
Troubleshooting
No
Turn off the supply and connect a GPIB
controller to the supply. Turn on the supply and
using the controller, program the supply to full
scale voltage and current. Check that the supply
accepts the commands and can be programmed
down rapidly.
Does supply accept
commands ?
1. Check GPIB cable
2. Check A2J115, J117 and J120
No
Yes
Down Programming
OK
?
Check operation of the Digital Control Port
(See Appendix A of the Operating manual),
Serial Link (See Chapter 4 in Operating
manual) and the front panel voltage/current
rotary controls (See Chapter 5 in the Operating
manual).
Go to "Slow Down Programming"
troubleshooting Fig. 3-15
Yes
Digital Control Port
OK
?
Serial Link
OK
?
Rotary Controls OK
?
Check Primary Interface A2
U113, U114, U118.
Check A2U109, U114.
Check Voltage and Current
controls (A3G1 & G2).
No problem found. Perform
Verification tests in Chapter 2 to
determine if a problem exists
No
Yes
Yes
Yes
Yes
No
No
No
Figure 3-2. Overall Troubleshooting (sheet 3 of 5)