PDA

View Full Version : EB's Doctor gets a house-call



Fish Tales
13th February 2010, 12:23 PM
Background:
I bought my Dr Who pretty cheap, its low fade, almost perfect PF, sweet plastics, new DMD, plays sweet but.........at some stage it has had miosture inside the cab. This has led to surface rust on brackets that are attached to the underside of the PF. I was fully aware of this issue when I bought the pin, and took a gamble I guess because it was cheap. Some of the rust is minor surface, some has eaten a mm or 2. I know alot/maybe most guys wouldnt touch a pin like this :unsure. I thought hard about it, but hey its game I love, and cool if it can be saved. None of the PCBs are effected.

Fix: well hopefully its a long term fix! I took my chinese dremel out, and ground down the rust, careful to leave a layer of rust for application of Ranex (rust converter). A few days after grinding off the rust, and applying the Ranex it looked pretty decent (alot better anyway).

Before example:

http://i41.photobucket.com/albums/e260/Gwind/ke2.jpg

After example:

http://i41.photobucket.com/albums/e260/Gwind/rust001.jpg

Next issue was the Mini PF. It was fixed before I took delivery, but after a few days play one of the mushroom buttons became sticky, and I started to get a mini PF opto error. I played the machine up until today, just wasnt game to remove the Mini PF.
Well after some months consideration, and after reading this nice guide: http://members.shaw.ca/tomblack/drwho%20miniPF%20repair.pdf I decided it was something I could do.

Took the mini PF out this morning, and have started the resto. I found that the sticky mushroom button's circlip was rubbing/getting stuck on a opto LED. The solder on that LED has broken away, and the LED itself is worn. I am unsure if this LED can be re-used, or I can just whack in another :unsure.

http://i41.photobucket.com/albums/e260/Gwind/drwhomini005.jpg

I am considering placing a fibre or rubber washer between the opto PCB, and the plastic housing to slightly lower the LED. There is no adjustment to correct this issue, just looks like I get bodgy/inventive.

http://i41.photobucket.com/albums/e260/Gwind/drwhomini015.jpg

Few more pics:

http://i41.photobucket.com/albums/e260/Gwind/drwhomini016.jpg

http://i41.photobucket.com/albums/e260/Gwind/drwhomini001.jpg

http://i41.photobucket.com/albums/e260/Gwind/drwhomini003.jpg

So other than a good clean, and correcting this issue I should be able to return my doctor to full health soon. Well after Monday because I will get the bosses advice, and use the better gear at work.
:cool:

Pinball Warehouse
13th February 2010, 06:33 PM
Good work there Greg, removing the mini playfield is not an easy job at the best of times, you have done well, spacing the led that is binding on the mushroom button is a good fix and not too hard to achieve. Keep up the good work.

Fish Tales
13th February 2010, 07:46 PM
Thanks Tony, it felt great to get the thing out. I am sure alot of pin repair is mind over matter. I am unsure if that LED will be usable due to its wear, of course if worse comes worse then a new set of opto boards maybe the way to go (not cheap though).

MrMaloo
13th February 2010, 09:38 PM
Great job Greg . Would it be easier to replace some of those rusty brackets rather than repair them (particularly the cable-carrying brackets . There's not much to them).

shansta
13th February 2010, 10:12 PM
Thanks Tony, it felt great to get the thing out. I am sure alot of pin repair is mind over matter. I am unsure if that LED will be usable due to its wear, of course if worse comes worse then a new set of opto boards maybe the way to go (not cheap though).

Never played with one yet Greg, but wouldn't you just source an IR LED? Even paying Jaycar prices would be cheaper than a opto board? Or is it? :unsure

Did the "mobile phone in night camera mode" trick on a suspect remote control at work, nobody had heard of it... :laugh:

P.S. P/F looks like it will clean up rather well! Nice one!

furballx
14th February 2010, 09:41 AM
I am sure alot of pin repair is mind over matter.


100% correct I reckon Greg. I must have had a dozen people or more ask me in chat or at meets is I was going to do the MM PF swap myself. Answer is hell YES! There are so many resources out there to get you out of trouble if you make a stuff up it is not funny. Worst case is you still end up paying a tech to do the fix on the stuff you got wrong. A possible exception would be board repairs for someone who cannot solder, in that case they prob should get them done professionally. otherwise take your time and have a go!
Dave

Fish Tales
19th February 2010, 03:23 PM
Re-soldered the opto boards, spaced the offending opto with a fibre washer, re-assembled mini pf, got it back in, and.............the third mushroom button stuck! Pulled the mini pf back out, added another fibre washer, wacked it back in and............no errors, and no sticky buttons!
:cool:

http://i41.photobucket.com/albums/e260/Gwind/whofin001.jpg

ppohlman
20th February 2010, 12:49 AM
Re-soldered the opto boards, spaced the offending opto with a fibre washer, re-assembled mini pf, got it back in, and.............the third mushroom button stuck! Pulled the mini pf back out, added another fibre washer, wacked it back in and............no errors, and no sticky buttons!
:cool:

Great work there!!

I'm sure that replacing the mini PF for the second time was tons easier than the first time.

Fish Tales
20th February 2010, 07:13 AM
Great work there!!

I'm sure that replacing the mini PF for the second time was tons easier than the first time.

Yep, no one should scared-off this title due to mini PF issues. Once you have taken it out once, its a piece of piss for the next time :cool: