Agilent Technologies 6814B - Manual (Page 29)

Turn-On Checkout - 3
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In Case of Trouble
Error Messages
Ac 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 and Error keys will show the error number. Selftest error messages appear as:
ERROR <n>, 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 ac source requires service.
Table 3-1. 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 WAVEFORM section checksum failed
Error 5 Non-volatile RAM STATE section checksum failed
Error 6 Non-volatile RAM LIST section checksum failed
Error 10 RAM selftest
Error 11 to 18 DAC selftest 1 to 8
Runtime Error Messages
Under unusual operating conditions, the front panel display may show OVLD. This indicates that the
output voltage or current is beyond the range of the meter readback circuit. If the front panel display
indicates -- -- -- -- -- -- , a GPIB measurement is in progress. Appendix C lists other error messages that
may appear at runtime.
Line Fuse
If the ac source appears "dead" with a blank display and the fan not running, first check your power
source to be certain line voltage is being supplied to the ac source. If the power source is normal, the ac
source line fuse may be defective. If the ac source has a defective fuse, replace it only once. If it fails
again, investigate the reason for the failure. Proceed as follows:
1. Turn off the front panel power switch and remove the input power (unplug the power cord or
open the safety disconnect).
2. Remove the fuse cover from the rear panel.
3. Unscrew the fuse caps and remove the fuses.
4. If any fuses are defective, replace all three with fuses of the same type (see Chapter 1).
5. Turn on the ac source and check the operation. If it is normal. replace the fuse cover.
Maintenance Note: It is recommended that new fuses be installed every four years.