New member introduction, questions on HP 21XX series machines,

From: Jay West <>
Date: Thu Oct 30 19:16:01 2003

Tony wrote... (re: 2100A)
>Maybe I will find time to investigate it
> sometime (does anyone have schematics???)

> But driver transistors can and do fail. Sometimes there were specially
> selected, so you might have to try a few transistors until the machine
> works again, and/or tweak the current levels, etc. Not impossible to do.
The transistors on the core board which fail are very common. I haven't had
to replace any on the XYD or ID boards so I am not sure there.

Received on Thu Oct 30 2003 - 19:16:01 GMT

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