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Corvette Pinball service resto & repair PIC HEAVY

Shark

Registered
Joined
Sep 7, 2012
Messages
74
Location
Central Scotland
The Corvette was in need of a good servicing. I bought it in the knowledge
it required a service and repair to the LT5 engine toy, had many bulbs out,
in need a full rubber kit and a good clean. It had been off the road for many
years but looking beyond the dirt, it was in fantastic minty condition.

I bought all the bits I needed to service it..

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Various bulbs
Various flashers
Four new balls
Shooter tip
Shooter spring
Shooter outer barrel spring
Corvette rubber set - white, red flippers
Cleaning sticks - sand, leather
Mill wax - playfield cleaner/polish
Nevr-Dull - metal polish magic wadding

I was advised not to use the Millwax, so instead I will be using AutoGlym
High definition Wax (carnuba) for this deal..

Many photos were taken of the work being done, most for my benefit so I could
see how it went back together(!). They are all below..

The engine repair was going to be quite a job.. it requires alot of
dismantling to get to the parts that need looking at. So to begin with, I set
about reading up on the subject of engine failure which is a common Corvette
problem. From my findings, I understand the engine has 4coils, 2 optos, and a
Hall effect sensor with a horseshoe magnet and is prone to failure. Sometimes
it worked, other days it did not..an intermittent problem.

This was going to take a few evenings work. I started with replacing any
bulbs and flashers that were out.. I think I have replaced between 15 and 20
bulbs, some were in hard to access places too. I discovered a broken lamp
socket and fixed it with some solder, now it works.. all bulbs working.
After the bulbs, I refurbished the shooter with new springs and tip and some
polish. That was one evening. Shooter now feels great, very powerful and only
needs pulled a third of the way...smooooth.

Next, it was time to tackle that engine. The instruction manual was not
great, luckily I found an update PDF online with instructions on how to
dismantle the engine and ramp and set about taking it apart. I stripped it
down, had a poke about, cleaned the opto's and hey!! now it works perfect in
test mode with zero errors. Now the machine is back together, the engine
still works great and is doing things in game that it didnt do before- it
sits there grumbling away now again and vibrates real quick when shot with a
ball, itsbehaving just fine! Delighted!

While I had the engine in bits, it was a good time to replace all those
perished rubber parts. More dismantling required, but all good because it was
due a good clean anyway and with the ramps off, access is far better.
After washing and polishing the plastics, the playfield was cleaned with
glass cleaner and a couple of coats of HD wax applied. Polished to a
brilliant shine. The playfield really is mint condtion, I have been all over
it, there is no wear at all, no chips in the paint of finish..good as new all
over.

Now on to evening four, it was time to build it back up again. I would have
been hours sooner, but kept dropping screws and bolts through the playfield
holes, then they magincally disappear inside the cab and take thirty minutes
to find again- this happened a few times, very frustrating...I swear, I
driopped a ball in there and it took over 5 mins to find hiding behind a
bunch of cables..bent over back aching, iphone torch- you've all been there
im sure..

All put back together, it's as good as new and plays great. I can hardly hear
the ball move around new as it bounces around. No more whacking and banging
as it cracks off ancient brittle and hard perished rubber.. and it just
glides over the waxed surface..

Complete!

Still a few things to do like powder coating the legs and lock down bar, I'll
get round to thos another time, but for now, I'm just going to enjoy playing
this awesome game!
 
PICS!

New pin arrived- Corvette!

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A bit dirty..

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A quick wipe, great potential!

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Goodbye Freddy..

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Before any work was done..

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Lets begin!
First, replace those bulbs that are not working..

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This one here tried to cause trouble..

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It had a broken joint..

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A quick fix with some solder..

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..and its working again!

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More bulbs out, this time, in a tricky place...

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..but I still got it..

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FAIL..

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PASS..

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All the bulbs been done, time to do the shooter..

FAIL..

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PASS..

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Engine time..

FAIL..

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It's dead, hanging over to the right, limp..

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Disassembly instructions..

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The engine cover..

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..off..

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..side plastics, off..

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..plastic mounts, off..

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..cage off..

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..unplug all looms/connectors

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..don't forget the one at the back..

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..wireform track off..

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..ramp off..

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Here you can see the left and right opto's, the Hall effect sensor and

horseshoe magnet..I gave the lot a good cleansing.

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After some testing, it works!

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Yucky..

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New rubbers, time!

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On the left is a FAIL.. on the right is a PASS!

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I cleaned the flippers too (pic before clean)..

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FAIL..

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PASS..

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PASS, with HONOURS

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FAIL..

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PASS..

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I dont think these have ever been replaced. Its a major job to replace them

because of their position- under two ramps and wireform trail.. When the came

off, they were rock hard and brittle!

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Lots of rubber to do..

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Filthy..

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Clean..

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Stripped.. (ramps on left are plenty lookse to allow access underneath)

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Old crap..

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Wax time..

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While the wax is curing, polish the wireforms..

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..shiny!

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Wax off!

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All plastics cleaned too..

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nice job, shark dude.
i love lots of big photos in a shop log thread, i agree that it *is* pure pinball porn, but we all love porn, right? :eyebrows:
all that effort requires some feedback, so i have a few Qs for you:

-in that pic with the horseshoe magnet inside the engine, can you point out where exactly were the dirty optos causing trouble?. i presume you mean the black things that say opto1 and opto2 next to them, so did you just use windowcleaner on a Q tip?
-why were you told not to use the Millwax? i have some i bought off the Legend, and i think PH sells it too, so they must both think it's ok. so the new wax, you just smeared it on, let it dry for ten minutes, then rubbed it off? i'm not very good at understanding about polish and wax.
-what did you use to clean the flipper bats after taking the old rubber off? i have real problems with this area.
-i never heard of those leather and sandpaper cleaning stick before. any good? any particular area they are good for? where from? etc

thanks again matey

biker dude with big monkey.jpg
 
@ Grizz.. you're right, it was in very nice condition when I got it. Chap had owned it over 5 years and it sat unused, hadn't even been powered on for over 18months and I don't think it saw much use before him either. Had a good layer of grime and couple of faults. But structural and cosmetics were minty.. Compared to the machine I had before it which, looking back, was minging compared this...

@ Dan.. From what I understood about how the engine worked, there are two opto's..one to note all the way left, the other all the way right. When the engine moves to one side a metal tab breaks the opto beam, telling the cpu "im all the way left"..when the beam is broken, the Hall effect sensor measures the position of the horseshoe magnet's pole and stores that info as a number (say 186 for eg).. then the engine moves all the way to the other position and breaks the beam which tells the cpu "im all the way right", the sensor measures the position of the magnet again and stores that as a number (say 112 for example). With that information, the cpu can work out exactly where the dead centre position is. If an error is detected with the sensor or opto's the cpu will shut down the power to the engines' coils.
I cleaned the opto's with that leather cleaning stick you see above, with a little AutoGlass cleaner (in a spray bottle with a "trade secret" small dash of AutoGlym tar & Adhesive remover" mixed in) on the end of it. It did the trick.. the opto(s) must have been dirty and causing a random broken beam when the beam was meant to be open.


I was advised against Millwax by two separate guys on another forum.. in their words-

"Millwax seems to work better on earlier playfields, but be warned it has petroleum distallate in it (boo) and apparently the bottles have a habit if exploding after not being used for a while, but they may have fixed that."

"Apparently Millwax is not the stuff you should be using as it contains petroleum distillates which kill plastics, adhesives and paint. Discussion over the road and on several pinball sites"

Waxing it is easy enough- if you've ever polished a car? Just rub the wax in sparingly in a circular motion, let it dry/cure (10-15mins) then buff it off.. repeat a couple of times for best effect.

The dirty flippers I cleaned with the Glass cleaner mix mentioned above, the tar and adhesive remover mixed in helps dissolve the sticky rubber residue.

The cleaning sticks were helpful especially for cleaning the dirty optos in the engine. A slim stick with leather around the top, perfectly sculpted to reach into the hardest crevice.. Not used the sand one yet, but will be good for cleaning between the blades of leaf switches..

:D
 
For cleaning the U shaped optos a wet wipe will do the trick.

@Shark
If the machine was left sitting for that long you best replace the batteries (if you haven't already) and check for acid damage on the MPU. :scared:
 
I hear you.. but- the chap took the batteries out years ago before storage, he'd had that problem before he told me, learned the hard way! It's got three new Duracell's now.
 
Please don't use anything abrasive for cleaning the blades of leaf switches, if you do you will **** up the switch. A piece of card is all you need, close the switch on the card and pull the card away. this should be enough to clean the switch and not do any damage to it.
Good to know you got it all working and she has cleaned up a treat. Nice one.
 
Ah this was mine! the one that got away! decided to sell at the time as I was off pinball for a spell, I fully intended to do what Shark has done but time went by, as it does, but great to see it all done.

Did anyone here buy this? as I found the operators hand book for it LMK

Ronnie
 
This was a first rate Log and helped me with mine. If anyone is still following this I have a ? I updated my prom and now the chick who says "catch me if you can" speaks in German everything else is still English LOL sounds kind of sexy!!!
 
This was a first rate Log and helped me with mine. If anyone is still following this I have a ? I updated my prom and now the chick who says "catch me if you can" speaks in German everything else is still English LOL sounds kind of sexy!!!

Hope no stains on the coin door! lol
 
Ah this was mine! the one that got away! decided to sell at the time as I was off pinball for a spell, I fully intended to do what Shark has done but time went by, as it does, but great to see it all done.

Did anyone here buy this? as I found the operators hand book for it LMK

Ronnie
... I picked this up from Mark, I had played it at his, knew how Minty fresh it was and couldn't see it going for a steal on eBay so put a decent bid on it and won.
 
... I picked this up from Mark, I had played it at his, knew how Minty fresh it was and couldn't see it going for a steal on eBay so put a decent bid on it and won.

Cool nice one it's still in Scotland, do you still have it?
 
This was a first rate Log and helped me with mine. If anyone is still following this I have a ? I updated my prom and now the chick who says "catch me if you can" speaks in German everything else is still English LOL sounds kind of sexy!!!

On the one my employer owned, sometimes the woman spoke English and sometimes Spanish. I used to remark 'Talk American, b***h, you drive an American car, spend American dollars'. But what irked me was the dot animation for it - the image of the woman at the wheel slid into shot, but it was clear that it was simply the final, stationary, image; the front of her car wasn't drawn (it ended half way down the windshield pillars). A lack of time, memory space or motivation, I suppose.

The speech is in the sound roms, though, so that German dialogue was probably there all along.
 
Thanks, I found out that with the latest ver. she rotates thru a few languages.
 
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