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Diagnostic Testing and Troubleshooting (2620A/2625A)
Error Codes
5
5-5
Table 5-1. Error Codes
Error Description
1
2
3
4
5
6
7
8
9
A
b
C
ROM (A1U8) checksum error
External RAM (A1U3) test failed
Internal RAM (A1U4) test failed
Display power-up test failure
Display not responding
Instrument configuration corrupted
EEPROM instrument configuration corrupted
EEPROM calibration data corrupted
A/D not responding
A/D ROM test failure (A3U9)
A/D RAM test failure (A3U9)
A/D self test failure
Refer to Troubleshooting information later in this section.
Error 1 ROM (A1U8) checksum match failed.
All the bytes in the ROM (including a checksum byte) are summed.
Error 2 External RAM (A1U3) check failed.
Error 3 Internal RAM (A1U4) 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 Microprocessor (A1U4). 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 Microprocessor
attempts to read the result of this test.
Error 6 Instrument configuration
The instrument configuration information stored in nonvolatile RAM (A1U3) 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 EEPROM instrument configuration corrupted or EEPROM not initialized.
Error 8 EEPROM calibration data corrupted.
The EEPROM (A1U1) is divided into two storage areas: the instrument configuration storage and
calibration data storage. Each area uses a Cyclic Redundancy Checksum (CRC), against which
the data is checked on power-up.
• Error 7 is reported if the instrument configuration check finds an error; the instrument
configuration is set to factory defaults.
• If the calibration data CRC verification indicates that there is calibration data that is in error,
the front panel CAL annunciator is turned on, and Error 8 is reported.
Note
Errors 7 and 8 should always appear the first time an instrument is
powered up with a new, uninitialized EEPROM.Error 8 continues to
appear at subsequent power-ups until the instrument is fully calibrated.
Error 9 A/D Microcomputer (A3U9) failed to respond
This error is displayed if communication cannot be established with the 6301Y Microcomputer
(A3U9).
Error A A/D ROM test failure
All bytes of internal ROM for the 6301Y Microcomputer (A3U9) (including the checksum byte) are
summed.