The Museum of HP Calculators
Repairing It Yourself
Disassembling HPs.(brief instructions for most models)
9810/9820 Card Reader Drive Wheel Repair
Classic Series (HP-35, 45, 46, 55, 65, 67, 70, 80, 81, 91, 92 97)
Common Woodstock Problem and Repair Suggestions
printer overhaul discoveries
Service Tips (HP-31E, 32E, 33E/C, 34C, 37E, 38E/C)
HP-41 Series and Peripherals
Discharge: a possible solution for the HP48
a Voyager (HP-10C, 11C, 12C, 15C, 16C)
For parts or manuals, try HP at: (800) 227-8164 or try the
For more help, try the
Having Someone Else Repair It
If you need someone to make repairs for you, you can try:
Don Orourke at in
Florida at 407-671-1991 or INTLCALC@AOL.COM repairs HP-41Cs and HP82104A card readers, as well
as chargers and batteries. He also has HP-41s for sale along with software
Randy Sloyer at
for repairs on most HPs made in the last 20 years or so. However, Randy's site says that he is having health
issues and not accepting new work at this time.
For calculators that are still under warranty, please contact
For battery work specifically, you can also try:
Mark Hoskins at Waterhosko@aol.com
or 630-372-7656 repairs/sells/rebuilds Classic batteries and 4-cell subC
HP battery packs.
Has a good
variety of batteries at good prices.
Batteries Plus. Many U.S. locations including: Arizona at
800-677-8278 and South Dakota at 800-362-9833. Battery pacs are sometimes
repaired while you wait. A recent repair of an HP-41C pac cost $12.
Battery Works at 800-707-7000
International Calculator Sales in Florida at 407-671-1991 or INTLCALC@AOL.COM.
TNR Technical Inc at (800) 490-8418
Mille Et Une Piles at 34 rue Delambre, 75014 Paris, France
Hobby stores such as Tower Hobbies and Horizon Hobby often have extensive catalogs of batteries.
The Museum has not used any these services and can't recommend one over the
back to the main exhibit hall