Specific Troubleshooting Procedures; Power-On Self-Test Failures - Agilent Technologies 6631B Service Manual

Specific Troubleshooting Procedures

Power-on Self-test Failures

The power-on self-test sequence tests most of the digital and DAC circuits. If the supply fails self-test, the
display "ERR" annunciator will come on. You can then query the unit to find out what the error(s) are.
When an error is detected, the output is not disabled so you can still attempt to program the supply to help
troubleshoot the unit. Table 3-2 lists the self test errors and gives the probable cause for each error. Some
errors may be caused by missing or wrong bias voltages from the A1 pc assembly. Before replacing either
the A2 or A3 assemblies check the +5, +15 and –15 volt secondary biases in table 3-3.
NOTE: A partial self test is performed when the *TST? query is executed. Tests that interfere
with normal interface operation or cause the output to change are not performed. The
return value of *TST? will be zero if all tests pass, or the error code of the first test that
failed. The power supply will continue normal operation if *TST? returns a non-zero
value.
Error Code Description
E1 Checksum in Read-only Non-volatile ROM
E2 Checksum in Config Non-volatile ROM
E3 Checksum in Cal Non-volatile ROM
E4 Checksum in State Non-volatile ROM
E5 Checksum in RST Non-volatile ROM
E10 RAM test failed
E11 12 bit DAC test failed, 0 is written to DAC U241A and B, ADC U242
is checked for 133 +/- 7 counts
E12 12 bit DAC test failed, 4095 is written to DAC U241A and 0 to B,
ADC U242 is checked for 71 +/- 7 counts
E13 12 bit DAC test failed, 0 is written to DAC U241A and 4095 to B,
ADC U242 is checked for 71 +/- 7 counts
E14 12 bit DAC test failed, 4095 is written to DAC U241A and B, ADC
U242 is checked for 10 +/- 7 counts
E15 8 bit DAC test failed, 10 and 240 are written to DAC U244, ADC
U242 is checked for 10 and 240 +/- 7 counts
E80 Dig I/O test failed, SEC_PCLR written low and high, read back
through Xilinx
E213 RS-232 input buffer overrun
E216 RS-232 framing error
E217 RS-232 parity error
E218 RS-232 UART input overrun
Table 3-2. Self-Test Error Codes/Messages
Troubleshooting - 3
Probable Cause
A2 Interface Bd
A2 Interface Bd
A2 Interface Bd
A2 Interface Bd
A2 Interface Bd
A2 Interface Bd
A2 Interface Bd
A2 Interface Bd
A2 Interface Bd
A2 Interface Bd
A2 Interface Bd
A2 Interface Bd
A2 Interface Bd
A2 Interface Bd
A2 Interface Bd
A2 Interface Bd
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