HP 6633B - Manual (Page 34)

4 - Turn-On Checkout
34
In Case of Trouble
Error Messages
Dc source failure may occur during power-on selftest or during operation. In either case, the
display may show an error message that indicates the reason for the failure.
Selftest Errors
Pressing the Shift, Error keys will show the error number. Selftest error messages appear as:
ERROR where "n" is a number listed in the following table. If this occurs, turn the power off
and then back on to see if the error persists. If the error message persists, the dc source requires
service.
Table 4-2. Power-On Selftest Errors
Error No. Failed Test
Error 0 No error
Error 1 Non-volatile RAM RD0 section checksum failed
Error 2 Non-volatile RAM CONFIG section checksum failed
Error 3 Non-volatile RAM CAL section checksum failed
Error 4 Non-volatile RAM STATE section checksum failed
Error 5 Non-volatile RST section checksum failed
Error 10 RAM selftest
Error 11 to 14 VDAC/IDAC selftest 1 to 4
Error 15 OVDAC selftest
Error 80 Digital I/O selftest error
Runtime Error Messages
Appendix C lists other error messages that may appear at runtime. If the front panel display shows
OVLD , this indicates that the output voltage or current is beyond the range of the meter readback
circuit. If the front panel display indicates -- -- -- -- -- -- , an HP-IB measurement is in progress.
Line Fuse
If the dc source appears "dead" with a blank display and the fan not running, check your power
source to be certain line voltage is being supplied to the dc source. If the power source is normal,
the dc source fuse may be defective.
1. Turn off the front panel power switch and unplug the power cord.
2. Remove the fuse from the rear panel.
3. If the fuse is defective, replace it with a fuse of the same type (see "Input Connections" in
chapter 3).
4. Turn on the dc source and check the operation.
NOTE: If the dc source has a defective fuse, replace it only once. If it fails again, the dc
source requires service.