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Full Version: Re: HP-33E Parts
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I don't see how a short or open in the flexiprint cable (about the only faults that could occur as a result of your repair) could cause the machine to stay on all the time. Are you
sure the on/off swtich contact is correctly positioned in the slider -- sometimes it jumps out when the logic assembly is clipped in place.
Then there can be a short between the pads of the on/off switch on the 'PCB'.
Getting back to the flexiprint, I had to repair the one in my 32C (same fault). I cut off both ends of it. Then I took the machine apart, and traced the tracks of the flexiprint strip to components on the PSU PCB. I took a length of 3-way ribbon cable (torn from the edge of a wider piece -- the sort of stuff you use to make floppy disk drive cables, etc) and soldered the cores to the appropriate points on the PSU board. I cut it to length and soldered the other end to the battery contacts and rivets on the
battery terminal PCB. I then put the machine back together. Worked first time, unlike my previous attempts to repair the flexiprint by soldering it together.

Can't the flexiprint be replaced by regular wire?

Sure you can use normal wire. That's what the ribbon cable I used is -- 3 plastic-covered wires in a ribbon. It's a piece of the same
cable that I use to make floppy drive cables, IDE cables, SCSI cables, and so on.
You could use individual wires, but the ribbon cable is neater and easier to handle.