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Doctor Who
| Manufacturer: | Bally |
| Model Number: | 20006 |
| Produced units: | 7,752 |
| Widebody: | No |
| Num. players: | 4 players |
| IPD No.: | 738 |
| Serial Nr: | xxxxxxxxxxx |
| MfgDate: | xx/xx/xx |
I finally found a Doctor Who in nice condition at a nice price. The mini playfield had a slipping gearbox that needed fixing. Also the front right legmount needed fixing and apart from massive fading at the front the game was in good condition.
A was very pleased to find the 'Manuals' envelope still inside and a set of nos sling plastics.
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Dw left sling.jpg
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Past & present issues
Static noise
There were some slight crackling sounds coming out of the speakers and I noticed it had gotten worse in the last two weeks or so. So when one day F111 blew I figured I should recap the sound board to remove the static.
Having the two filter caps desoldered I decided to replace the LM1875 audio amplifier at the same time since I now had easy access to it, also it is not an expensive component.
After reassembly I powered the game up and all I can say i WOW. There was complete silence, not even a slight buzz or hum. I am very pleased with how this turned out.
 Caps removed and audio amplifier cut out |
 Clean solder pads ready for new components |
 New amplifier and caps installed |
F111 (BR3)
Fuse F111 blew and a quick check on BR3+BR4 showed that BR3 was bad. Rather than just replace the faulty bridge I decided on replacing all bridge rectifiers and their respective capacitors on the power board.
Mini playfield motor/gearbox
When I got the game the mini playfield was inoperable with a suspected broken gearbox for the elevator. This mean disassembling the whole mini playfield including the dreaded gearbox.
 Battered and broken |
 Top view, mylar is starting to peel |
 Removing mylar with a heat gun |
 Fresh clear coat, 3 layers |
 Dirty time expander targets |
 Cleaning with magic eraser |
 Desoldering target optos |
 Nice, ready for new optos |
 Finished assembly with new optos and backing |
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 Finished with protector installed |
Leg mounting plates
The cabinet and both front legs had sustained some damage in the past to the point that the cabinet separated in the corners. A previous owner had done some repairs to stitch it all back together. Looking at it I decided it had to be completely replaced and so I installed the newer leg mounting brackets.
 "Repaired" leg mount |
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 New style leg bracket |
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