You may be able to fix keypad buttons which are no
longer working, by simply “washing the back of the keypad membrane” with
dish soap, and finishing up with Isopropyl.
I have fixed several TV Remote’s and cordless
phones, suffering from some sticky key positions, over the years.
The carbon coated circuit board contact points (in the rubber) under each
key position eventually gets so oily, from the rubber pad’s gradually leaching
out its remaining, imbedded “mould release agent”, that the entire circuit
board’s, printed circuit copper contacts get coated, and you are pressing down
on a film of oil. Then the key doesn’t close its corresponding circuit.
The most heavily used numbers or function keys on any hand controller
exude the most oil under them, from such continual pressing, and eventually the
entire circuit board copper contacts under them, become quite slimy.
So, the best time to fix sticky buttons is when you have
the Handpad open for a battery change. Examine or touch the circuit board to
check the “oily level”.
If there seems to be any, then I would (carefully) slip
out the keypad membrane from it top cover and give it a good basin-wash
with something like DOVE pure dish soap which we use for telescope mirrors, That
will also wash away years or decades of dirty fingerprints and dust on the
membrane top surface, causing keys to stick to the similarly dirty hole edges.
Finish up with Isopropanol alcohol (99% pure is best) to
clean-up of any remaining soap residue, and pat dry the circuit board and the
membrane’s underside, before replacing. Then the button(s) should make better
contact closures to the circuit pad position.
Haven’t done this on my two AP Handpads yet, because I
use them so rarely that they haven’t squeezed out much oily agent yet, but
have done the fix on similar device hand controllers around the house.
Perhaps Roland can chime in on my repair method for balky HC’s.
Hope this helps.
Sent: Sunday, June 14, 2020 10:46 AM
Subject: [ap-gto] Old Keypad Repair/Refurbishing
am wondering to what extent the fine folks at Astro-Physics can refurbish older
I have an older one that I got in 2005 with my 1200GTO,
the serial number is 1652GTO.
Two years ago various buttons started
getting flaky so I though it would be nice to get a new keypad as my primary
keypad and I put this one in the box as a backup.
Now I am getting my
AP900 ready to sell and I was going to include the old keypad in the bundle if I
can get it working right.
I have replaced the battery and reloaded the
battery, re-loaded the database and have uploaded the latest firmware.
However, the keypad sometimes locks up on initialization as I am trying to enter
in location and park position data. Maybe this is because of the buttons
not working properly or something is wrong with the new firmware.
keypad a lost cause because it just doesn't have the horsepower to run the
latest firmware or can a new button module be fitted and the keypad be
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