Hi,
I did the same kind of replacement in my garden irrigation timer. It had
membrane switches and I replaced them by ones very similar to yours, but
because the switches were of the flat sandwich type it needed quite
mechanical work. Aesthetically the result was perfect, and the tactile
feel quite superior. I plan to do the same thing in my 1998 when it
needs that.
Good luck,
Ignacio EB4APL
On 05/04/2014 22:53, Jim wrote:
Ulrich Bangert <df6jb@...> writes:
Gentlemen,
I know I am not the only one in this group to have difficulties with
"weak"
tactile switches on Racal-Dana's 1991/2/6 range of counters. The other day
I
talked to the chief technician at Rosenkranz-Elektronik which is one of
the
biggest surplus suppliers in Germany.
He knew the problem very well and his claim was that an exact replacement
for the original Toko switches is no more produced anywhere in the world.
Which may be an explanation why none of us managed to find an exact
replacement.
<snip>
I finally had to dive into my Racal Dana 1992 counter, after it had
developed several bad switches. I found that through-hole 6x6mm tactile
switches with four leads will fit in the counter pcb holes diagonally. That
is, if you trim off the leads from two opposite corners, the other two leads
are very close to the required distance to go into the existing pcb holes. I
just ordered some of these switches from ebay with a long plunger that looks
to be perhaps 2mm round. I'm going to drill holes into the back of the
existing keycaps to be a press-fit to the plunger on the new switches. I
think it will all hold together. If this works, it is a cosmetically and
functionally perfect solution. I'll report back after I've tried it.
The switches I picked are 6x6x10.5mm Tactile Pushbutton Switches,
ebay item 161008571229,
Jim
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