Diagnostic Testing and Troubleshooting (2635A) 5A

Memory Card I/F PCA (A6) Troubleshooting.

∙With ’CtS’ (Clear to Send) displayed, use the UP or DOWN arrow key to select ’OFF’. Then press ENTER.

∙With ’ECHO’ displayed, use the UP or DOWN arrow key to select ’ON’. Then press ENTER. Communications setup for Hydra is now complete.

Assuming that the RS-232 interface is functional, send a carriage return or line feed character to the instrument and it should send back a prompt. With a Static RAM memory card installed in the instrument, send the following command followed by a carriage return or line feed:

MCARD_DESTRUCTIVE_TEST? <size> where the <size> parameter is the number of kbytes (1024 bytes) of the card to test. Use <size> = 256 for a 256 kbyte card and <size> = 1024 for a 1 Mbyte card.<end>

This command writes data to the memory card and then reads and compares the data to the pattern that was written. A maximum of twenty lines of output will be generated, but all locations on the card are sequentially written and then read. The messages output by this command are summarized below:

MEMORY CARD IS NOT INSERTED!

The Memory Card Controller doesn’t recognize that the memory card is inserted in connector A6P1. Verify that A6U1-19 and A6U1-21 are both near 0 volts dc.

MEMORY CARD IS WRITE PROTECTED!

The Memory Card Controller is indicating that the memory card is write protected. Verify that the switch on the rear edge of the memory card is in the proper position and that A6U1-22 is near 0 volts dc when the memory card is powered up.

MEMORY CARD TEST PASSED.

The memory card test passed without detecting any errors.

ADDRESS 0x000000: DATA WAS 0x14, EXPECTED 0xC9

ADDRESS 0x000001: DATA WAS 0x3D, EXPECTED 0x2D

ADDRESS 0x000002: DATA WAS 0xAB, EXPECTED 0xBD

These are typical errors indicating in hexadecimal the address, the data that was read from the card and the data that was expected. It may be possible to get some indication of which address or data signals to probe with an oscilloscope to determine where the fault is.

When probing signals to detect activity, it may be useful to change the <size> parameter to be 16384 so that it will attempt to test the card as if it is a 16 Mbyte memory card. This guarantees that error messages will be output, but it will take longer to complete the test thus allowing more time to probe signals before having to send the memory card test command again.

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Fluke 2625A, 2635A service manual Memory card test passed without detecting any errors
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2635A, 2625A specifications

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