(Topic ID: 247631)

Doctor Who: Adjusting the Time Expander

By ryan98011

7 months ago

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  • 3 posts
  • 3 Pinsiders participating
  • Latest reply 7 months ago by bluespin
  • Topic is favorited by 1 Pinsider


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#1 7 months ago

Hi everybody,

I am rehabbing a Doctor Who and have replaced the faulty Time Expander motor/gearbox. The assembly now raises/lowers great but I cant figure out how to make it level with the playfield in resting position. The two mounting brackets sit on top of the playfield so I can see raising the unit would be easy with some washers but not sure how to lower it. Any suggestions?

Attached are some pics so you can see what I am talking about. The left side is slightly raised off the playfield (maybe 1/16-1/8") and causes balls to be deflected.

Thanks, Ryan

IMG_6369 (resized).JPGIMG_6370 (resized).JPG
#2 7 months ago

It's a common issue. Yup, washers as shims work well to raise. Lowering can be a bit of a deal. I've heard tell of people removing wood from the MPF to lower. However, before going there, I would look very closely at the brackets themselves OR you are missing a roller.

If you're missing one of the rollers, it's bad. You need the side rollers AND the roller on the cam... it's not common but I've seen this before.

The PF is flat... the MPF is flat. Yet the MPF rides the bracket wonky... so, my $1 on the table is that the bracket is not square. It can happen with a ball getting stuck between the PF and MPF and the motor keeps cranking (lots of torque).

Pull the MPF assembly again, separate the brackets from the MPF wood and even pull the cam off.... just get the brackets and run this up and down by hand over and over again. It needs to mover really smoothly without wobble.... that's the goal.


Use wood clamps to put light pressure to press in/pull apart the brackets to alter shape. You may need to over tweak a bit to have it spring back to the desired shape.

I found a document sent to owner/operators back in the 90's regarding a "canting procedure". I posted to IMDB a few years back.


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