[time-nuts] Racal-Dana tactile switches

EB4APL eb4apl at cembreros.jazztel.es
Sat Apr 5 21:33:43 UTC 2014


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 at ...> 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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