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Diagnostic Testing and Troubleshooting (2635A)
Error Codes
5A
5A-5
Table 5A-1. Error Codes (2635A)
Error Description
1
2
3
4
5
6
7
8
9
A
b
C
d
Boot Firmware (A1U14 and A1U16) Checksum Error
Instrument Firmware (A1U14 and A1U16) Checksum Error
NVRAM (A1U20 and A1U24) Test Failed
Display Power-up Test Failure
Display Not Responding
Instrument Configuration Corrupted
Instrument Calibration Data Corrupted
Instrument Not Calibrated
A/D Converter Not Responding
A/D Converter ROM Test Failure (A3U9)
A/D Converter RAM Test Failure (A3U9)
A/D Converter Self Test Failure
Memory Card Interface Not Installed
Refer to Troubleshooting information later in this section
Error 1 Boot Firmware (A1U14 and A1U16) Checksum Error
All the bytes in the Boot section of Firmware (including a checksum) are summed.
Error 2 Instrument Firmware (A1U14 and A1U16) Checksum Error
All the bytes in the Instrument section of Firmware (including a checksum) are summed.
Error 3 NVRAM (A1U20 and A1U24) Test Failed
A test pattern of data is written to and then read from the NVRAM locations that are not used for
Non-volatile instrument configuration and measurement data. If the pattern read from any RAM
location is not the same as the pattern written, the test fails.
Error 4 Display Power-up Test Failure
Error 5 Display Not Responding
The display processor automatically performs a self-check on power-up, and the Microprocessor
attempts to read the result of this test.
Error 6 Instrument Configuration Corrupted
The instrument configuration information stored in nonvolatile RAM (A1U20 and A1U24) has
been corrupted. (The Cyclic Redundancy Checksum on this memory is not correct for the
information stored there.) The instrument configuration is reset to the default configuration.
Error 7 Instrument Calibration Data Corrupted
The Flash Memory (A1U14 and A1U16) is divided into three storage areas: the Boot Firmware,
the Calibration Data, and the Instrument Firmware. The Calibration Data uses a Cyclic
Redundancy Checksum (CRC) for data security, against which the data is checked on power-up.
Error 8 Instrument Not Calibrated
The calibration data includes status information to indicate which of the measurement functions
(Volts DC, Volts AC, Ohms, and Frequency) have been calibrated. If any functions have not been
calibrated, this error is reported.
Note
Errors 7 and 8 should always appear the first time an instrument is
powered up with a new, uninitialized Flash Memory. Error 8 continues to
appear at subsequent power-ups until the instrument is fully calibrated.