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HP-67 not displaying decimal point



#5

Hi all!

I'm restoring/repairing an HP-67 for a friend.

It took me a long time to find the proper parts and I have restored the card reader, the battery contacts, found a perfect keyboard with non-yellowish keys.

It now works fine except for one thing: the decimal point does not display.

That is all digits display perfectly, calculations, programming... are fine except the decimal point that should light and doesn't!!

Logic board is Ok.

I would like to repair it if possible instead of swapping the display subassembly because I use the Bendix Hp-67 as a base and it has a very complex internal wiring to a specific connector (I've posted pics here a couple of months ago)

Does anybody have a hint ?

Many thanks in advance!

Etienne


#6

Hi all,

Me again.

I've solved the problem.

One of the Bendix connector wires had an unwanted connection to the display driver.

The decimal point is back !

Thanks

Next week-end, I'll try to post a couple of picture of the internals.

Etienne


#7

Etienne,

by solving the problem by yourself, you've spoiled our party! We would have been so happy to help you locating the problem ...
;-)

I'm looking forward to your pictures!

Best Regards,
Juergen


#8

Hello Jürgen !

Don't worry, I still have problems with the Bendix-67 :-)

Mainly a weird behaviour during calls to LBLs A to E (programming them is Ok, calling them is not).

As I don't know if this is related to this particular customized calculator, I'll let it to rest for this week and try again in a couple of days.

It's been 8 hours and 2 sushi meals since I started the repair.

Even if it's not my first 67 repair, I proceed more cautiously with this one as I don't want to break the custom connectors all linked to the card reader.

Instead, I'll post the first pictures in a couple of minutes.

Cheers to all !

Etienne


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