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Error
Display
No.
El
FP RAM
E2
FP ROM
E3
EE
CHKSUM
E4
PRI XRAM
E5
PRI IRAM
E6
PRI ROM
E7
GPIB
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:
Excessive number of write cycles to an EEPROM (see "Nonvolatile Memory Write Cycles" in "Supplemental
Characteristics" tables). This condition, which would appear only after extended use, 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 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
2. PASWD will appear on the display.
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
See "Appendix A - Calibration" for more information about the calibration password.
4. Save any operating state (for example, press
5. Turn the power off and then back on.
A normal display free of error messages should appear. If not, the power supply requires service.
Runtime Error Messages
Under unusual operating conditions, the VOLT or AMPS display may show +OL or –OL. This indicates that the output
voltage or current is beyond the range of the meter readback circuit. Table 3-4 shows other error messages that may appear
at runtime.
Display
EEPROM status timeout
EE WRITE ERR
SBUB FULL
Message too long for buffer
SERIAL DOWN
Failed communication with front
STK OVERFLOW
Front panel stack overflow
26
Turn-On Checkout
Table 3-3. Power-On Selftest Errors
Failed Test
Front Panel RAM
Front Panel ROM checksum
EEPROM
Primary external RAM
Primary internal RAM
Primary ROM checksum
GPIB R/W to serial poll
Table 3-4. Runtime Errors
Meaning
Error
Display
No.
E8
SEC RAM
E9
SEC ROM
E10
SEC 5V
Ell
TEMP
E12
DACS
.
. The Cal annunciator will go on.
).
Display
UART byte framing error
UART FRAMING
UART OVERRUN
Overfilled UART receive buffer
UART PARITY
UART byte parity error panel
Failed Test
Secondary RAM
Secondary ROM checksum
Secondary 5 V ADC
reading
Secondary ambient
thermistor reading
Secondary VDAC/IDAC
readback
Meaning
).
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