The Museum of HP Calculators

HP Forum Archive 13

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"2 disease" information
Message #1 Posted by Jon on 4 July 2003, 5:09 p.m.

Luiz:

Here you have some information of two calculators with the "2 disease" I have dissasembled today.

Hp 33E: Solderless, CPU 1MA4 01 13205(80092) Chips: empty 1MA1204 and 1MA302

HP 34C: Solderless, CPU unknown Chips 1MA114, unknown and 1MA115 (1)

(1) I donīt know why but the reference id of CPU and chip 2 are not readable

When I repair other calcs I will post the info

Sorry but I donīt know how to post the information in rows as you made ...

Cheers

Jon

      
Re: "2 disease" information
Message #2 Posted by Vieira, Luiz C. (Brazil) on 4 July 2003, 5:54 p.m.,
in response to message #1 by Jon

Hi, Jon;

thank you very much for the valuable info.

About text format: use PREformat text. Start text with [pre] and finish it with [/pre]. Like this:

[pre] one
two
three[/pre]

It will look like this:

one
two
three

Somewhat easy... when we know. Further info: Advanced format techniques

Best reagrds.

Luiz (Brazil)

            
HP-34C CPU id number
Message #3 Posted by Jon on 5 July 2003, 4:20 p.m.,
in response to message #2 by Vieira, Luiz C. (Brazil)

Hi Luiz:

I have cleaned the HP-34C CPU wit solvent. It had some kind of glue. It should be forbidden some people service these calcs. Ok, id number is: 1820-2162-A (7905BV).

Cheers

Jon

                  
Re: HP-34C CPU id number
Message #4 Posted by Vieira, Luiz C. (Brazil) on 5 July 2003, 11:52 p.m.,
in response to message #3 by Jon

Hi, Jon;

thank you again. It seems the HP33E you mentioned in previous post has a paper label or a CPU code that's different of those I saw so far. As you mentioned you had some glue in the HP34C's CPU chip, it probably had a paper label on it, tto.

BTW, is this HP34C the one that had a [ Pr Error ] problem? Did you read my post about it? If so, did you succeed repairing it by changing the position of the chips (1) and (2)? I'm just curious about it, because if you did not get positive results, you may also have a power supply board with some sort of problem.

Best regards.

Luiz (Brazil)

Edited: 6 July 2003, 12:09 a.m.

                        
HP-34C REPAIRED
Message #5 Posted by Jon on 6 July 2003, 5:43 a.m.,
in response to message #4 by Vieira, Luiz C. (Brazil)

Hi Luiz:

You are great!!!. I have changed the ICs and now it works great. When I got your answer I was ready to replace every capacitor in the AC/DC circuit. The only fault it has is the “2 disease” and rests of glue everywhere inside, but it coesnīt affect to function and you donīt notice it when reassembled. Another calculator badly serviced with that problem……

Thanks again

Jon


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