Re: PK5501 LCD Some Keys Don't Work

["Bob La Londe" <none@xxxxxxxxxx>]

"Jim" <alarminex@xxxxxxx> wrote in message
news:ef5b0e3a-9a06-42a5-b0bd-de8ac9c067fa@xxxxxxxxxxxxxxxxxxx
> On Thursday, October 4, 2012 7:59:48 PM UTC-4, Bob La Londe wrote:
>> PK5501 LCD Some Keys Don't Work I had a service call to move a keypad
>> today because the customer is removing the wall where it was previously
>> mounted. After the move keys 369# (and the various special function keys)
>> no longer work. Keys 124578*0 still work fine and user codes using those
>> keys (fortunately they had some programmed) still arm and disarm. I
>> didn't drop or abuse the keypad in anyway during the move. It seemed like
>> an easy service call. Any suggestions? I did already order a replacement
>> keypad.
>
> Had they already begun construction? Maybe dust inside?  Did you
> disassemble and look at the lands on the PC board? Is there a ribbon
> connector that may have come loose? I don't know the configuration/layout
> of the keypad but it looks possible that 3,6,9 and # are all in a verticle
> row. That would indicate (to me, anyway) either a loose/bad connection
> either on the PC board or wires in the keypad or something to do with the
> processors matrix. If you have an eye loup or good magnifier, look at the
> solder connections on the PC board. In removing the Keypad, you may have
> flexed the PC Board and broken a component or lead solder connection. It
> depends on how crazy you want to get with it but, you could touch each of
> the solder connections with a (not too hot ) iron.
> Nah!  Only I'm that crazy.

I did take it apart and give it the eyeball, but I didn't go get my reading
glasses out of the truck.  Never carried a loupe in the truck, but I do have
a couple in the shop.  Maybe its time to start.