Fluke 45 - Page 97

Diagnostic Testing and Troubleshooting
Error Codes
5
5-5
Table 5-1. Error Codes
Error No. Meaning
1
2
3
4
5
6
7
8
9
ROM test failed
External RAM test failed
Internal RAM test failed
Display self-test failed
Display dead
EEROM meter configuration corrupted
EEROM calibration data corrupted ("UNCAL" annunciator also lights)
A/D chip dead
Measurement self-test failed
Refer to Troubleshooting information later in this chapter.
Error 1 ROM (A1U8) checksum match failed.
All the bytes in the ROM (including a checksum byte) are summed
Error 2 External RAM (A1U10) check failed.
Error 3 Internal RAM (A1U6) check failed.
Complementary patterns are alternately written and read from each RAM location for
both external RAM and the 256 bytes internal to the 6303Y Main Processor (A1U6). If the
pattern read from any RAM location is not the same as the pattern written, the test fails.
Error 4 Display self-check failed
Error 5 Display dead.
The display processor automatically performs a self-check on power-up, and the Main
Processor attempts to read the result of this test.
Error 6 EEROM (A1U5) meter configuration corrupted or EEROM not initialized.
At power up, A1U6 reads CRC from EEROM (A1U5) location, then reads configuration
data from another location in EEROM, calculates an algorithm to compare to the CRC. If
an error is determined, the meter configuration is set to factory default and Error 6 is
displayed.
Error 7 EEROM (A1U5) calibration data corrupted.
The EEROM is divided into two storage areas: the default meter configuration storage and
calibration data storage. Each area uses a Cyclic Redundancy Checksum, against which
the data is checked on power-up. In addition, the calibration data includes parity
information for each calibration constant, which is also checked.
If the meter configuration check finds an error, the meter configuration is set to factory
defaults, and Error 6 is reported.
If the parity check or the calibration data checksum finds an error, the front panel UNCAL
annunciator is turned on, and Error 7 is reported.
Note
Errors 6 and 7 should always appear the first time a meter is
powered up with a new, uninitialized EEROM. Error 7
continues to appear at subsequent power-ups until the meter
is fully calibrated.
Error 8 Analog Measurement Processor (A1U1) dead.
Error 9 Measurement self-check failed.
The Analog Measurement Processor is programmed to do self test measurements. If the
Analog Measurement Processor does not respond, it is considered dead.