Author Topic: Simple test light for EM repairers  (Read 318 times)

0 Members and 1 Guest are viewing this topic.

Offline oldpins

  • Trade Count: (+1)
  • *****
  • Forum Posts:
  • Brisbane North QLD
    • oldpinballs.com
Simple test light for EM repairers
« on: May 30, 2010, 08:28:43 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, 03:41:46 PM by oldpins »

Offline goodolddays

  • Trade Count: (0)
  • ******
  • Forum Posts:
  • Riverstone NSW
Re: Simple test light for EM repairers
« Reply #1 on: May 30, 2010, 08:38:31 AM »
Very handy Item .. I'm definitely going to build one .
Thanks for the tip  ^^^
I need more room ! and more $$$

Offline ddstoys

  • Trade Count: (+23)
  • ******
  • High Score Initials:
  • Forum Posts:
  • Geelong
Re: Simple test light for EM repairers
« Reply #2 on: May 30, 2010, 09:30:53 AM »
Great Tip  ^^^

Offline Strangeways

  • Pinball Restoration is my passion
  • Administrator
  • Trade Count: (+9)
  • *****
  • High Score Initials:
  • Forum Posts:
  • Melbourne
  • ABN 68 283 634 461
    • Australian Pinball Restorations
Re: Simple test light for EM repairers
« Reply #3 on: May 30, 2010, 12:27:26 PM »

That's one handy tip !
Aussie Pinball - Proud to be Australia's Premier Pinball Forum

APR - Australian CPR Distributor

http://www.australianpinballrestorations.com.au/

http://www.rtbb.com.au/catalog/

We carry the largest range of NEW Ramps in Australia

Offline Marty Machine

  • Trade Count: (+12)
  • ******
  • Forum Posts:
  • Vic - East Subs
Re: Simple test light for EM repairers
« Reply #4 on: May 30, 2010, 08:49:28 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.