Agilent Technologies 654 A Series Service Manual

36 Troubleshooting
Table 3-2 Self Test Error Codes/Messages
Code/Message Description Probable Cause
El FP RAM Front panel RAM test failed
(power-on).
Microprocessor A3U3 defective.
E2 FP ROM Front panel ROM test failed
(power-on, and for models 664xA &
665xA, also *TST?).
ROM A3U4 or address latches A3U8 defective.
E3 EE CHKSM Front panel EEPROM checksum test
failed (power-on, and for models
664xA & 665xA, also *TST?).
Possibly due to power loss during a write operation.
See Checksum Error Recovery in the Operating
Manual. If power loss is not the problem, EEPROM
A3U6 could be defective (after replacing U6, supply
must be initialized and calibrated).
The following four items (E4-E7) apply only to Agilent models 664xA & 665xA supplies.
E4 PRI XRAM Primary interface external RAM test
failed (power-on).
RAM A2U108 defective.
E5 PRI IRAM Primary interface internal RAM test
failed (power-on).
Microprocessor A2U114 defective.
E6 PRI ROM Primary interface ROM test failed
(power-on, and for models 664xA &
665xA, also *TST?).
ROM A2U106 defective.
E7 GPIB GPIB interface test failed (power-on). Talker/listener chip A2U117 defective.
E8 SEC RAM Secondary interface RAM test failed
(power-on).
Microprocessor AlU504 defective.
E9 SEC ROM Secondary interface ROM test failed
(power-on, and for models 664xA &
665xA, also *TST?).
Microprocessor AlU504 defective.
El0 SEC 5 V Secondary interface 5 volt read back
test failed (power-on, and for models
664xA & 665xA, also *TST?).
Comparators AlU513, read back DAC
AlU511/U512, or secondary bias supply defective.
E11 TEMP Ambient temperature read back test
failed power-on, and for models
664xA & 665xA, also *TST?).
Thermistor AlRT770 or comparator AlU513
defective
E12 DACS CV or CC DAC tests failed
(power-on).
CV DAC AlU507/U508 or CC DAC
AlU509/U510 defective (see Figure 3-10).
Note: The following error messages can appear due to a failure occurring either while the power supply is operating or
during the self test.
SERIAL TIMEOUT Serial data line failure on GPIB or
isolator board.
See Figure 3-13.
SERIAL DOWN Serial data line failure on GPIB or
isolator board.
See Figure 3-13.
UART PARITY UART failed. UART chip A2U112 defective.
UART FRAMING UART failed. UART chip A2U112 defective.
UART OVERRUN UART failed. UART chip A2U112 defective.
SBUF OVERRUN Serial buffer failure. UART chip A2U112 defective or GPIB board is in
SA mode.
SBUF FULL Serial buffer failure. UART chip A2U112 defective or GPIB board is in
SA mode.
EE WRITE ERR EEPROM write failure. EEPROM A3U6 defective or calibration error.
SECONDARY DN Serial data line failure on main board
or isolator board.
See Figure 3-14.

Agilent Technologies 654 A Series Specifications

General

Brand	Agilent Technologies
Model	654 A Series
Category	Power Supply
Language	English