Service manual

Troubleshooting 27
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). A1 board probably defective.*
E2 FP ROM Front panel ROM test failed (power-on
and *TST?).
A1 board probably defective.*
E3 EE CHKSM Front panel EEPROM checksum test failed
(power-on and *TST?).
EEPROM U6 on the A1 board probably defective.*
E4 PRI XRAM Primary interface external RAM test failed
(power-on).
A2 board probably defective.
E5 PRI IRAM Primary interface internal RAM test failed
(power-on).
A2 board probably defective.
E6 PRI ROM Primary interface ROM test failed
(power-on and *TST?).
A2 board probably defective.
E7 GPIB GPIB interface test failed (power-on). A2 board probably defective.
E8 SEC RAM Secondary interface RAM test failed
(power-on).
A10 board probably defective.*
E9 SEC ROM Secondary interface ROM test failed
(power-on and *TST?).
A10 board probably defective.*
E10 SEC 5V Secondary interface 5 volt readback test
failed (power-on and *TST?).
A10 board probably defective,* or A6 bias board
defective
E11 TEMP Ambient temperature readback test failed
(power-on and *TST?).
A10 board probably defective.*
E12 DACS CV or CC DAC tests failed (power-on). A10 board probably defective,* or A6 bias board
defective (see Figure 3-7).
NOTE: The following error messages can appear because of a failure while the unit is operating or during selftest.
SERIAL TIMOUT Serial data line failure on A2 board. See Figure 3-8.
SERIAL DOWN Serial data line failure on A2 board. See Figure 3-8.
UART PARITY UART failed. A2 board probably defective.
UART FRAMING UART failed. A2 board probably defective.
UART OVERRUN UART failed. A2 board probably defective.
SBUF OVERRUN Serial buffer failure UART. A2 board probably defective or A2 board is in SA
mode (see Figure 3-12).
SBUF FULL Serial buffer failure. A2 board probably defective or A2 board is in SA
mode (see Figure 3-12).
EE WRITE ERR EEPROM write failure. EEPROM U6 on the A1 board probably defective
or calibration error.*
SECONDARY DN Serial data line failure on Main board. See Figure 3-9.
* If you replace either the Al or A10 board, the power supply must be reinitialized and calibrated.