User manual

30 Turn-On Checkout
Selftest Error Messages
Table 3-3 lists the displayed selftest error messages. All these errors are hardware failures that require service.
Note If you are using the optional Agilent 66001A MPS Keyboard, it will also display selftest error
messages.
Table 3-3. Selftest Error Messages
Display Failed Test Display Failed Test
U 1 Internal RAM U 8 Ambient temperature reading
U 2 External RAM U 9 (Not used)
U 3 ROM checksum U 10 Voltage programming, low range
U 4 (Not used) U 11 Current programming, low range
U 5 (Not used) U 12 Voltage programming, high range
U 6 12 V supply U 13 Current programming, high range
U 7 5 V supply
The power module also can detect an EEPROM checksum error. This error is not identified by number, but causes the
following symptoms:
•
The power module starts up with both the VOLTS and AMPS full-scale programming and metering ranges
accepting values up to 1000.
•
Self-test error code 330 is stored in the SCPI error queue where it can be read by software (see "Chapter 5 -
Error Messages" in the Programming Guide).
•
The software identify query (*IDN?) returns 0A in the model field.
•
The calibration password is set to 0.
An EEPROM checksum error can occur due to the following operating conditions:
•
Excessive number of write cycles to an EEPROM (see Table 1-2). This condition is not recoverable and
requires service.
•
Loss of ac input power during a checksum calculation. This condition, which is very unlikely, is recoverable.
You may be able to recover by performing the following steps from the controller or keyboard:
1. Enable the calibration mode (CAL:STAT ON,0)
2. Save an operating state to EEPROM. (e.g., *SAV 2)
•
This forces the power module to write to EEPROM and establishes a new checksum.
Runtime Error Messages
Table 3-4 lists the runtime error messages. Runtime errors cease normal power module operation, disable the output, and
display a code on the front panel. The error code is preceeded by "U" and is displayed on both the VOLTS and AMPS
displays. Runtime errors are hardware malfunctions that require service.
Table 3-4. Runtime Error Messages
Display Meaning Display Meaning Display Meaning
U 101 EEPROM write error U 102 Internal software error U 103 Unexpected interrupt