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Troubleshooting 33
Table 3-2. Selftest Error Codes/Messages
Code and/or
Message
Description Probable Cause Selftest Error
Codes/Messages
El FP RAM Front panel RAM test failed (power-on). Microprocessor AlU3
E2 FP ROM Front panel ROM test failed (power-on
and *TST?).
ROM AlU4 or address latches AlU8
E3 EE CHKSM Front panel EEPROM checksum test failed
(power-on and *TST?).
Possibly due to power loss during a write
operation. See Checksum Errors in Chapter 3 of
Operating Manual. If power loss is not the problem,
EEPROM A1U6 could be defective. (If you replace
AlU6, the power supply must be reinitialized and
calibrated.)
E4 PRI XRAM Primary interface external RAM test failed
(power-on).
RAM A2U108
E5 PRI IRAM Primary interface internal RAM test failed
(power-on).
Microprocessor A2U114
E6 PRI ROM Primary interface ROM test failed
(power-on and *TST?).
ROM A2U106
E7 GPIB GPIB interface test failed (power-on). Talker/listener A2U117
E8 SEC RAM Secondary interface RAM test failed
(power-on).
Microprocessor Al0U506
E9 SEC ROM Secondary interface ROM test failed
(power-on and *TST?).
Microprocessor Al0U506
E10 SEC 5V Secondary interface 5 volt readback test
failed (power-on and *TST?).
Comparators Al0U516, Al0U517 readback DAC
A10U512/U515, or secondary bias supply (5Vs
A4U304)
E11 TEMP Ambient temperature readback test failed
(power-on and *TST?).
Thermistor Al0RT500 or comparator
Al0U517
E12 DACS CV or CC DAC tests failed (power-on). CV DAC Al0U510/U513 or CC DAC
A10U511/U514 (see Figure 3-7).
NOTE: The following error messages can appear due to a failure occurring either while the power supply is operating or
during selftest.
SERIAL TIMOUT Serial data line failure on A2 board. See Figure 3-10 (system) or Figure 3-11 (bench).
SERIAL DOWN Serial data line failure on A2 board. See Figure 3-10 (system) or Figure 3-11 (bench).
UART PARITY UART failed. UART A2U112
UART FRAMING UART failed. UART A2U112
UART OVERRUN UART failed. UART A2U112
SBUF OVERRUN Serial buffer failure UART. UART A2U112 defective or GPIB board is in SA
mode
SBUF FULL Serial buffer failure. UART A2U112 defective or GPIB board is in SA
mode
EE WRITE ERR EEPROM write failure. EEPROM AlU6 defective or calibration error
SECONDARY DN Serial data line failure on Main board. See Figure 3-12.