Re: PK5501 LCD Some Keys Don't Work

[Jim <alarminex@xxxxxxx>]

On Friday, October 5, 2012 8:44:28 PM UTC-4, Bob La Londe wrote:
> "Jim" <alarminex@xxxxxxx> wrote in message news:ef5b0e3a-9a06-42a5-b0bd-d=
e8ac9c067fa@xxxxxxxxxxxxxxxxxxx > On Thursday, October 4, 2012 7:59:48 PM U=
TC-4, Bob La Londe wrote: >> PK5501 LCD Some Keys Don't Work I had a servic=
e 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 vario=
us special function keys) >> no longer work. Keys 124578*0 still work fine =
and user codes using those >> keys (fortunately they had some programmed) s=
till 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 al=
ready order a replacement >> keypad. > > Had they already begun constructio=
n? 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 kno=
w 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) eit=
her 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 remov=
ing the Keypad, you may have > flexed the PC Board and broken a component o=
r 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 eye=
ball, but I didn't go get my reading glasses out of the truck. Never carrie=
d a loupe in the truck, but I do have a couple in the shop. Maybe its time =
to start.

At times I think I could use a pair of glasses with two 20X eye loupes glue=
d onto the lens of the glasses.=20

I think it must be the air polution that prevents me from seeing as good as=
 I used to.