|Re: HP-3421A and HP-75C control|
Message #7 Posted by Vassilis Prevelakis on 28 Jan 2004, 10:47 p.m.,
in response to message #6 by andy
> it may be a ridiculous suggestions, but do you have the little "disable/enable" switch switched to enable?
This switch controls the printer ROM in the module, its not
involved in the operation of the HP-IL.
I'd just form a null loop with the two wires of the module plugged one into the other and see if there is a timeout.
There is also a possibility that a flag in the 41 is causing problems with the loop, so doing a MEMORY LOST with the module plugged it may bring it back to life.
The last thing to check are the wires themselves. Try sticking a sewing needle in the wire as close to the point where it exits the module and test connectivity with the corresponding pin in one of the connectors (with the cable unplugged of course).
If this reveals a broken wire, then the fault will prob be near the connectors. If not, you may want to disassemble the module and do the connectivity tests again, this time from the very beginning of each cable.
If its not a cable fault, then you will have to get another module from eBay, there is always at least one on auction.