HP-65 1508A04995 restoration and ideas to share

[albertofenini]

(06-11-2024 02:14 AM)Mike S Wrote:  Thank you Alberto for your, as always, excellent 65 photos and notes.

Sorry, I can't shed light on you labels question. Could you though, tell us how you polished the calculator display window?

Quote:Added photos for the o-ring, the cleaning of the keyboard pcb, the polish of the display and the matte finishing for the faceplate

Mike

Sure we can, but first two things must be said :

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or notify us and we will remove the pictures showing commercial products

Try these at your own risk, we do not take any responsibility for whatsoever damage
can these products cause to your devices

That said :

PLASTIC SHELL (mostly the lower half)

"Mafra All Purpose Cleaner" comes from the world of car detail (that's another passion we have), it can be diluted 1 part of product 5 parts of water, usually used
for cleaning plastics from the interior of the car, and it works quite well on the external shell of the calcs, we have NOT used on the front place as it could permanently damage the lettering

Should you not be able to find Mafra products, any products from car detail for interior plastics should do, we have found these much less aggressive then the degreaser found at the supermarket we used before

After that, only on the lower shell, we apply some "Pronto", is a liquid wax usually used for wood forniture, apply a couple of drops and with some cotton distribute,
it will give a nice and pleasant finish, remove the excess and let dry, it is not oily
which is what we like

DISPLAY

"Sidol" is an almost liquid polishing cream, usually used for polishing silver or metals we had excellent results with the display
Just apply a drop of two, distribute with a cotton and let it dry

Then we use a Dremel accessory 423S at the minimum possible speed (5000 rpm on our unit) as you do not want to overheat and ruin the display

Depending on how deep are the scratches you may want to use some sandpaper first
start with something like a 600, possibly with water, and then go up to step by step up to a 2000 always
with water

Then apply the cream polish process and it will look like new

Remember to protect very well the surrounding silver trim or it will worn out

We like, to leave some age signs, it must look restored but not made like off the shelf,
but that it's just us you can obviously do it as you like it more

FACEPLATE

For the front place use a drop of very very light soap and warm water, do not use hard brushes or similar things or you'll ruin it for good, rinse and repeat

After the dirt has been removed, and after you have masked and protected the trim and the display you can apply few layers
(we do it five times but we let the faceplate dry in between) of "Tamiya TS80", it will give a matte look very very nice

For these and many others tips credits must be given to a lot of other authors here in the forum from whom we have learned reading their beautiful posts,
list would be too long to name them all but we will be for ever thankful as their support is unbelievable

Hope this help, take care

Updated pictures can be found here : HP-65 1508A04995