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 don´t 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 don´t 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 coesn´t affect to function and you don´t notice it when reassembled. Another calculator badly serviced with that problem…… Thanks again Jon

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