Selftest Errors - Agilent Technologies 654 A Series Operating Manual

Selftest Errors

When a selftest error occurs, it prevents all front panel operation. The display may show either a power-on error message or
a checksum error message.
Power-on Error Messages. Power-on messages appear as:
En- - - - - -
Where "n" is a number listed in Table 3-3. If this occurs, turn the power off and then back on to see if the error persists. It is
possible to recover from the EE CHKSUM error (see "Checksum Errors"). If any other message persists, the power supply
requires service.
Error No
Checksum Errors.
If the display shows EE CHKSUM, the power supply has detected an EEPROM checksum error. A checksum error can occur
due to the following conditions:
n
Excessive number of write cycles to an EEPROM (see "Supplemental Characteristics"). This condition, which would
appear only after extended use, is not recoverable and requires service.
n
Loss of ac input power during a checksum calculation. This condition, which is very unlikely, is recoverable.
You may be able to recover from a checksum error by writing to the EEPROM while the power supply is in the calibration
mode. To do this, proceed as follows:
1. Enable the calibration mode by pressing
PASWD will appear on the display.
2.
3. Press the number keys corresponding to the password, followed by
Note
On new equipment, the calibration password corresponds to the four- digit model number (such as
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Table 3-3. Power-on Selftest Errors
Display
FP RAM
E1
FP ROM
E2
EE CHKSUM
E3
E4
E5
E6
E7
SEC RAM
E8
SEC R0M
E9
SEC 5V
E10
TEMP
E11
DACS
E12
). See Appendix A for more information about the calibration password.
Failed Test
Front Panel RAM
Front Panel ROM checksum
EEPROM
(Not used)
(Not used)
(Not used)
(Not used)
Secondary RAM
Secondary ROM checksum
Secondary 5 V ADC reading
Secondary ambient thermistor reading
Secondary VDAC/IDAC readback
.
. The Cal annunciator will go on.
Turn-On Checkout 37