HP Forum Archive 06

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Re: HP-33E Parts Message #1 Posted by Tony Duell on 4 Sept 2001, 5:01 p.m. 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.

Re: HP-33E Parts Message #2 Posted by gilpetri on 4 Sept 2001, 6:12 p.m., in response to message #1 by Tony Duell Can't the flexiprint be replaced by regular wire?

Re: HP-33E Parts Message #3 Posted by Tony Duell (UK) on 5 Sept 2001, 7:07 p.m., in response to message #2 by gilpetri 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.

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