HP-65 1508A04995 restoration and ideas to share

[albertofenini]

Hello everyone

we have started to restore an HP-65, and I'm attaching few pictures
Nothing on the cosmetic side, we have worked more on the functionality side

we wanted however share two things and ask the forum about a curiosity

inside the unit there were two labels, a bigger one that was loose inside the unit
and a smaller one attached to the card reader unit

it appears the unit was repaired in the 84, and we were curios to know if the
codes on the label can be translated in the equivalent repair work performed,
any idea ?

we basically have only cleaned the unit and rebuilt the gummy wheel

while doing so we have dropped a drop of the spray lubricant that we have
pictured (@Administrators we are not whatsoever related to this product and/or
its sale, if this is not convenient please let us know and we will remove the picture)

this particular product is way better than what we used before (the WD-40) as it
is "dry" and has made very very quiet the motor, so we wanted. to suggested

also, we have found useful to mark with the tip of pen (red in this case) the
position of the pin that keeps the gummy wheel attached to the card reader unit,
a correspondent mark has to be done on the card reader

we believe it can make easier the alignment procedure

also, after the answers we had got about the correct size for the o-ring
we had purchased a silicon tube ID 1/8" OD 1/4" which in metrics sets the
OD at the value of : 6,35 mm

this more or less the equivalent OD of a 006 o-ring which has an ID of 2,90 mm and thickness
of 1,78 mm OD = 2,9+1,78+1,78 = 6,46 mm

In the pictures you will notice the tubing cut and mounted on the wheel

However, even with a drop of glue, the ID is slightly too big for the wheel
and it slips without transporting correctly the card

We went back to the o-ring (pictures will be updated soon) and it worked fine

As anyone ever used the tubing approach and has experienced a similar problem ?

Will keep posting, next works to be done is to clean the keyboard plate as
the upper row is working intermittently and change we "clutch"

Also one of the pins for connecting the external charger is missing and has been
replaced with what looks like a needle to ensure the contact necessary for running
on battery

Take care and thanks for any idea you will want to share !

Pictures can be found here : HP-65 1508A04995