Author Topic: Simple test light for EM repairers  (Read 3187 times)

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Offline oldpins

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Simple test light for EM repairers
« on: May 30, 2010, 09:58:43 AM »
When fault finding or trouble shotting on EM machines (AC voltage) it can be difficult testing coils on score reels, ball in play & player stepper units etc. which are located in the back box. I use this test light instead of a multimeter as it gives a positive visual that a coil or contact is being energised.(especially if the score motor is pulsing a coil on the score reels on reset, or a relay is counting up etc) It has many uses for testing circuits & may also be used for DC voltages of 15v or below, however observe correct polarity. (You could lower the resistor value if you require a brighter LED, don't go below 1k .
« Last Edit: June 18, 2010, 05:11:46 PM by oldpins »

Offline goodolddays

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Re: Simple test light for EM repairers
« Reply #1 on: May 30, 2010, 10:08:31 AM »
Very handy Item .. I'm definitely going to build one .
Thanks for the tip  ^^^
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Offline ddstoys

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Re: Simple test light for EM repairers
« Reply #2 on: May 30, 2010, 11:00:53 AM »
Great Tip  ^^^

Offline Strangeways

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Re: Simple test light for EM repairers
« Reply #3 on: May 30, 2010, 01:57:26 PM »

That's one handy tip !
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Marty Machine

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Re: Simple test light for EM repairers
« Reply #4 on: May 30, 2010, 10:19:28 PM »
Yep, a very handy tool indeedy....

I made a very similar thingy, but used a bridge-rectifier where the test leads go in, to avoid polarity issues, which then you can remove the diode shown in your diagram.

Using a bridge-rectifier will then give a lot less AC flicker on the LED.

hope this helps too ;-)
MM.