6-79
1. Check BT800 and the components that connect and disconnect the battery from the NV RAM at
power-off and power-on respectively.
A failure of 6100 is serious to the normal operation of the 2430, and the cause of the failure should be
found and corrected to prevent reoccurrence.
If FAIL, the calibration constants have been lost and a COLD START is executed. The instrument
must be recalibrated to return to calibrated operation after a COLD START.
Troubleshooting Procedure:
Calibration Constants:
6100
CAL
CONSTANTS
On power-up, all of these are recalculated and compared to the stored CRCC word. If they do not
agree, that test fails.
When a waveform is saved, the CRCC is calculated for the waveform and headers and saved.
When power-down is executed, the values of the front-panel variables have a CRCC calculated and
stored.
When the instrument is SELF CALIBRATED, a CRCC is calculated and stored for the Calibration Con-
stants in NV RAM.
NOTE
FAIL and PASS flags in the Extended Diagnostics menu show the results of the last test
ran. If a defective device that has previously caused a FAIL flag to be set is replaced, the
test must be run again to obtain a PASS indication in the menu.
Some of the CRCCs (check sums) are computed at power-down and will be valid only at power-up.
Therefore, executing tests 5000 through 5003 will only display the flags that resulted from power-up
diagnostics.
Testing Method:
6000 Nonvolatile RAM Checksum A12U664 (schematic diagram 1):
CK SUM-NVRAM
If test 5300 fails, replace Waveform J.LPROMs U480 and/or U490 with the correct ones for the version
of System J.LPcode being used.
Troubleshooting Procedure:
The version number in the header is preset to
"?"
and is filled in by this test. If the test fails, the
"?"
will remain in the header for further indication of an error. A Waveform J.LPreset causes the Waveform
J.LPto read the version number bytes of the Waveform J.LPcode. If the version number is incorrect, the
Waveform J.LPcode is incompatible with the System J.LPcode and may not execute properly.
Testing Method:
Waveform J.LPROM A12U480 and A12U490 (schematic diagram 2):
5300
VERSION-CHK
Table 6-6 (cont)
Maintenance-2430 Service
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