New book from The Calculator Store: HP41 Repair: A Beginner's Guide to Repairing your HP41 Calculator. 14.00€ paperback version, 9.99 Kindle version. Only in Amazon
We have been told that the book is not visible in some of the amazon websites worldwide. Here we offer links to all of them:
amazon.com
amazon.co.uk
amazon.de
amazon.fr
amazon.es
Amazon.it
Zebra + Lower postProduct no.: zebra+lowerpostSet of zebra + lower post repair piece
Old price
41.00 €
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Assembled HP-41c battery bay and expansion ports moduleProduct no.: Flex-PCB AssembledAssembled module for the often damaged flexible PCB in the battery bay (and I/O ports) of the HP-41c range of calculators. Shipping included in price for EU customers. New price: cheaper circuit translating to 10% lower price! |
Assembled HP-41c battery bay and expansion ports module FlatProduct no.: Flex-PCB AssembledFlatAssembled module for the often damaged flexible PCB in the battery bay (and I/O ports) of the HP-41c range of calculators. Shipping included in price for EU customers. This is the FLAT version, when the screw head domes are broken and grinded down - see pictures. New price: cheaper circuit translating to 10% lower price! |
New Zebra connector for HP41C repairProduct no.: Zebra PCBThis piece is for repair of HP41c full nut calculator, substituting the damaged or corroded zebra connector that links the main board with the processor circuit. New design. |
New Repair kit for HP-41c battery bay and expansion portsProduct no.: Flex-PCBAdhesive circuit for the often damaged flexible PCB in the battery bay (and I/O ports) of the HP-41c range of calculators. Shipping included in price. |
Spacer set for repairing old HP41cProduct no.: SpacerSetSet of 8 pairs of spacers for nut-screwed full-nut HP41c calculators. Substitutes the nuts that are screwed on the lower posts to secure the circuit, |
lower post long screw - inoxProduct no.: lowerscrewTwo long screw for the lower screw posts of HP41c calculators |
lower post long screw - black pairProduct no.: lowerscrewblackTwo long screw for the lower screw posts of HP41c calculators - black |
New Set of 4 screw for HP41 - inoxProduct no.: ScrewsetTwo long screw for the lower screw posts of HP41c calculators + two long screws for upper posts. |
4 x Piece for repair of back case of HP41CProduct no.: brokenback44 pieces for repairing HP41c back cases. This piece is for repair of HP41c back halves, specifically the support of the upper screw heads that is often damaged, and very difficult to repair in a lasting way.
Old price
72.00 €
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New HP41c Lower Post Repair KitProduct no.: Lower Post Repair KitSet of pieces needed to repair successfully the lower posts of HP41C, 41CV and 41CX full nut calculators, including zebra connectors, lower post part, and keyboard support for clothes' pegs to protect the keyboard
Old price
70.00 €
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HP41c battery holder springProduct no.: SpringStainless steel 304 springs for HP41C battery holder |
Piece for repair of back case of HP41CProduct no.: brokenback1 Piece for repairing HP41c back cases. This piece is for repair of HP41c back halves, specifically the support of the upper screw heads that is often damaged, and very difficult to repair in a lasting way.
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New Lower Post Repair partProduct no.: LowpostrepairPiece to repair HP41c full nut series lower screw posts |
New Upper Post Repair partProduct no.: UpperPostRepairPiece to repair HP41c series upper screw posts (tested with both fullnut and halfnut versions) |
Keyboard support for repairsProduct no.: keyboard supportPiece required for the lower post repair of HP41c calculators. |
New zebra connector holderProduct no.: zebraholderZebra Holder to keep the elastomeric zebra connectors in the contacts between main board and processor circuit in the HP41c calculator family, full nut versions. |
Repaired HP41c back sideProduct no.: HP41CbackRepaired back side of HP41c. It can be used in case the original backside has the screw supports broken. |
Card reader side-locksProduct no.: cardreader sidelocks3D printed HP82104A card reader side-locks - set of left and right locks |
Instructions to repair the upper back case screw head support.
Upper post repair
Broken Lower Screw Post Repair
Under construction
If there are black spots in the LCD, the only solution is to change the screen. These are not produced anymore, so you will need to find a donor HP41c.
When the screen does not allow all segments to be seen, it may be one of several faults:
- Bad connections of the lower zebras
- Bad connections of the lightly soldered screen pins
- Bad connection between the LCD and the screen driver
- One of the two screen driving circuits gone bad
We will discuss all cases in the article.
How to get out of the screen these specs or dirt accumulated over so many years.
After a lot of time, we have just found a good solution to repair your scratched HP41C screen. There is an abrasive product used to repair watches' plastic screens, called Poliwatch. You can easily get it from Amazon and other sources.
The method: just apply a little quantity on the scratch, and then rub firmly with a soft cloth. You will get, once cleaned, a bright surface without scratches. Note: after some tests, we have found that the dremel method can overheat the plastic and lead to internal cracks or material deformation. It has to be manual!
Beware: do not try to use this material on crystal - it is so hard that it would not help at all.