Doctor Who mini-playfield gearbox/motor

(Topic ID: 219162)

Doctor Who mini-playfield gearbox/motor

By chaos19

11 days ago

Topic Stats

  • 7 posts
  • 4 Pinsiders participating
  • Latest reply 11 days ago by pinball_faz
  • No one calls this topic a favorite


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#1 11 days ago

My dr who mini play doesn't move in play or test mode. I get voltage on the motor on all the ccw and cw tests so I believe its the motor or gearbox or both. I can move the miniplayfield up and down by hand with some strength, does this mean the gearbox is stuffed. If it isn't I'ld like to buy a new 20V DC motor online but I have no idea of the RPM, torque or current. I emailed twice MultiProducts that built the gearboxes for Bally/Williams and they will not send me a reply (probably because I'am not a business). Also how do I unscrew the motor from the gearbox, its not as simple as my Indiana jones. Any info will be much appreciated.

#3 11 days ago

I would start with the bi directional board. There is a capacitor on there that likes to leak, and take out the trace below it.

#4 11 days ago

I started with the bi directional board and checked with my DMM and get +20v to -20v from the motor jumper with all cw & ccw tests as with the pins on the motor itself.

#5 11 days ago

I'm unclear if your motor is working at all. It sounds like you pulled the MPF... pull out the motor/gearbox then pull the motor off the assembly.
Plug the motor in the connector to check the motor. I really doubt the motor is burned out; it really does not get that kind of abuse.


#6 11 days ago

Its the gearbox i'm most worried about, they cost over $200 here in Aus. I read somewhere that if I can move the cam wheel, which happens when I move the mpf up of down by hand (I haven't taken the mpf out yet), then my gearbox is stuffed. I would like a second opinion.

#7 11 days ago

Assuming "stuffed"=="not awesome"... and yea, probably is.

I'd be happy to do a Facetime/Tango chat if you want to talk through it?

EDIT: Isn't it 3:00am in AUS?

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