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Zener diode for coin door and ipac

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AndyWarne:
No coin mechs I have come across pull the coin signal directly to 12 volts when there is no coin, its an "open collector" output, usually pulled up in the mech by a fairly high-value resistor. So using a zener in this way is perfectly OK.
Andy

Turnarcades:
Hi everyone and thanks for the input. You can see the installation from the diagram shown a few posts above. I did try you Andy but the replacement never arrived. Thanks to the person who posted the part number, I will try to get one from somewhere - all I needed was the part number!

Turnarcades:
Additional.....

I tried a 5v regulator; didn't work. Killed the coin signal completely.
The replacement diode can be had from Maplin. It's a 5.1v, 0.5A zener diode, and costs about 12p.

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