HP 41c card reader repair

[ThomasF]

Hi!

Has anyone tried the Service ROM for the 41 together with the card reader?

I have not done it (at least not yet), but I noticed when going through the code, that it tests e.g. the speed when reading, and it looks as if it gives a indication if too fast or slow (in %), and it can also return some count of the motor speed.

It also detects CRC errors etc, so it seems to be quite a good test suite for the card reader by the look of it, especially if one is trying to trim the motor.

The service manual (found on Eric's manual site) describes how to use the test (page 43-45 in the PDF).

I could give it a try and get back with my findings.

Cheers,
Thomas