Re: Keypad problem ?
Dominik Wos <dominik@...>
U mnie wszystko OK. Dzieki :-)
So where the problem was ? According to my neighbour the plastic
keypad which is inside is very sensitive to corrosion (he
manyfactures electronics for agiculture machines and uses this kind
of products). The paths are made from silver. Accourding to him it is
a rather common problem esspecialy that I bought my mount second hand
and I belive it is 2002.
It may be the case that after some time you may have the same problem
as mine. My keypad has been successfuly repaired with no cost from my
side. As you said - Home repair is better than recycling. I wanted to
take some pictures of my neighbour work but he said that this was our
know how and we should keep it secret. :-)))
Anyway I remember the case with my FLI filter wheel USB interface.
Unfortunately I used 12V power supply form SBIG STV (different
polarization) and the chip responsible for controlling the stepper
motor exploded - quite a loud noise (one simple diode used in the
design would sort out the issue I think). The response for FLI
customer support was that it could not be repaired and I can get a
new one for US$199. Fortunately thanks to "home repair" (exchange of
a standard chip) it could come back to life and the cost for me was
US$2 (two dollars). :-)))
Trzymaj sie Jozefie.
--- In ap-gto@..., "Joseph Zeglinski" <J.Zeglinski@...>
remote) in general.though.
keypad" leaches out some kind of oil as the years go by, probablymore if the
push buttons are used very often, like "TV channel surfing". Isuspect this is
the embedded "rubber mould, release agent", that remains behind inthe rubber
during manufacture, and slowly comes to the surface. Surprisingly,the oil
film on the PCB, seemed about 1/16 inch thick! Quite a puddle, notjust a
film. There is no way that the carbon bump under the rubber buttoncould make
electrical contact with the etched copper pattern under it, throughthat much
oil. I have now repaired my old Jerrold TV remote keypad about 3times, and a
few others for relatives, simply by taking the case apart, andwashing both
the rubber sheet and the matching contacts on the circuit board. Ijust poured
the Palmolive soap on the PCB, dunked the circuit board in thesink, and
gently scrubbed off the oil in the mild sudsy dish washing soap(NOT dish
washer detergent). On one unit, I tried, (unsuccessfully), justspraying the
PCB with Windex, Isopropyl alcohol, or similar degreaser, but thisscum
requires a bit of rubbing with a good soap to make the contactswork longer.
The keypad worked fine for another couple of years, or more, beforemy
favourite button (channel skip) leaked out more oil, and anotherwashing.
the TV remote pad was always in the living room, and certainly handoils can't
leak through a full, solid rubber, sheet of buttons - so thereseems to be no
external source of this thick oil cover, other than the rubbermembrane
material itself.manufacturer -
especially dunking the PCB in water - but since I was going totoss it away,
I took a chance and continue using my original controller for manyyears. The
water didn't affect the electronics after drying (isopropyl spraylike
eyeglass cleaner, might be a good final cleanup of any possiblyremaining
soap).try the above
home remedy, until it has expired, and you aren't sending it in forclean was the
PCB surface, and how old is your unit? I can't imagine why therewas a "trace"
needing repair, or how it might have been damaged. That is aquality concern.
I wonder if the PCB can't take a lot of push button flexing, in thecold.
finemy neighbour who deals with electronics.
Poland,(at least it should for some time).
ItEurope so it is not so easy for me to send the keypad to the US.
pressworks and only the first row of left side keys do not work (I
toit but there is no reaction) and as I use the mount in myobservatoryI can live without this first row. I have looked into the keypad
com]Onsee how it works and it is rather simply built but I have no ideacom, "Marj" <marj@> wrote:
mountBehalf Of Dominik WosSent: Thursday, March 29, 2007 4:54 AM
keysforone week I switched it on and from this time the three left
accessdonotfullywork (1, 6 and Goto). All other keys are ok and the mount isoperational with using RS232 conection but without having
to "1"hadkey I can not use goto without my laptop. Strange ? Has anyonethesame problem ?