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HP34C - Pyerre - 06-01-2006 Hello All, I've just got an used HP34C with leaked batteries in place corroding the connectors, the problem as many already know.
After open the case & clean the unit, I've powered it up and get the display running continuoustly
- s/n 212043xxxx
- made in Singapore - Small IC's : ILB90002 - 1MA10014 - 1MA10015 (all have HP logo engraved) - Large IC by AMI Is It really need batteries connected to run ? Any helps would be very appreciated. Many Thanks,
Pyerre
Re: HP34C - Walter B - 06-02-2006 Quote:
You may use it on batteries only. You MUST NOT power it up without good batteries inside. Else you will kill it, indicated by a running display. Many people did this experiment already, me too. Seems you are another one. Good luck next time!
Re: HP34C - Etienne Victoria - 06-02-2006 Hello Pyerre, Did you power it up with the Hp adapter or with a lab power supply ? The thing needs 2,4 to 3V DC to run.
Etienne
Re: HP34C - Pyerre - 06-02-2006 Hello,
I've powered it up with the 82087B HP adapter and thought that should have its own kind of batteries to work ? correction : s/n 2120Sxxxxx Many thanks,
Pyerre
Re: HP34C - Pyerre - 06-02-2006 *** The calculator undercharged overnight. This morning, its display showing all 0's and not run continuoustly anymore.
Pyerre
Re: HP34C - Etienne Victoria - 06-02-2006 Ok, For the time being, put aside the dreaded 82087B and the NiMh. I suggest the following:
- check that all your ICs are correctly oriented (the notch towards the LED display) and tell us how it goes.
Etienne
Re: HP34C - Pyerre - 06-02-2006 *** Hello Etienne, It displays all 0's !
Pyerre
Re: HP34C - Etienne Victoria - 06-02-2006 If this display persists and the power supply circuit is not corroded/broken, then one or more chips have fried. Do you have soldering equipment/ability ?
Etienne
Re: HP34C - Pyerre - 06-02-2006 *** > Do you have soldering equipment/ability ? Yes, I do. There's some corrosion at the pcb, but the ribbon cable looked like in good condition. May I need to bypass the ribbon cable ?
Thanks, Re: HP34C - Etienne Victoria - 06-02-2006 Hello Pyerre, No, I think the simplest way would be to adapt your display to a known working 34C board and discard your existing board as corrosion/adapter may have ruined the power supply along with some chips. Therefore, I propose you contact me directly at EtienneREMOVESPAM.victoria@orange.fr. I'll send you a working 34C board which is of the soldered type (more reliable one). You'll have to save your display and solder it to the board and then readapt the whole stuff in your calculator enclosure. Just drop me a mail if you are interested in trying this.
Etienne Edited: 2 June 2006, 10:27 a.m.
Re: HP34C - David Smith - 06-04-2006 I am assuming that you opened up the keyboard sandwich and cleaned all the pads where the chips connect with alcohol, then got the chips back in the right places, and got the thing back together again correctly. If so then...
A display of all 00000000 is the classic symptom of a fried ACT chip in the Woodstock series of calculators. In a Spice calculator like the 34C, your big chip is probably fried.
Re: HP34C - Pyerre - 06-05-2006 Hello,
Just to be curious, is this ACT chip compatible and can be replaced by the one found in the Spice calculators serie ?
Re: HP34C - Eric Smith - 06-05-2006 Quote: No. The ACT is a 22-pin chip, and the Spice series uses a 40-pin processor chip. The various Spice models use different variants of the processor chip, which are not interchangeable among all Spice models, though a few models do share a common chip.
Eric
Re: HP34C - Pyerre - 06-05-2006 *** Hello, Just to be curious again, Is the 34C's big chip unique or it also be used for another Spice model, and which one if it's the case ? Thanks,
Pyerre
Re: HP34C - Eric Smith - 06-06-2006 The 32E, 34C, and 38C use an 1820-2162 or 1820-2162-A processor. I'm not sure whether there's any functional difference beteween these. They should be interchangeable in all three models unless there is a code difference in the 8-pin ROM chips that requires a specific processor variant (with -A or without).
They are not likely to be interchangeable with the other Spice models.
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