Shop notes from Time Warp:
History & Repairs:
Time Warp came bundled with a Joust purchase on 1-24-2009. The owner had removed almost everything from the playfield in prep for a restore, but no longer had the desire to complete the project. Came with a spare mostly-assembled playfield which served as great reference for reassembly.
Initial Observations:
Appeared to have most of the typical Williams system 6 issues. Feature light section had charbroiled resistors, some of which had already been replaced, as evidenced by the missing & damaged traces from previous repairs. The switch matrix resistors R204-R211 were supposed to be 330ohm, but found 1K instead, indicating that the driver board may have been swapped with a Sys3 part. Original battery holder still in place - center terminals were rotted out. On the power supply board, the 6-pin plug containing grounds for the light/solenoid had a toasted pin, and a PO had simply cut & stripped that wire & wrapped it around the mounting screw for the power supply board. I mean, sure, that's probably a good ground and it'll work...but still.
Repair log:
Grounding mod at 3P2:
Only the bottom 2 connectors on the power board are used, and one had been badly burned. I replaced the burned pin, and added redundant connections to the center sockets. This, combined with switching to #47 bulbs should bulletproof it.
Power supply board:
- Replaced half-wave rectifier diodes
- Replace +5/+12 filter cap
- Replaced pins at 3J6
- Resoldered all pin connections
- Replaced all HV components
- Replaced burned GI ground pin, doubled-up grounds in plug
- Replaced backbox mounted bridge rectifiers
- Added fuses to BR inputs
CPU board:
- Removed battery holder, replaced with remote-mount holder
- Repaired some questionable traces near the battery holder (battery corrosion)
- Replaced a 4.7K resistor with an unusal goiter
- Replaced one Scanbe-made 40 pin PIA socket
- Resoldered all pin connections
- Replaced male through-board connectors
Driver board::
- Replaced 3W resistors with 5W wirewound
- Replaced switch matrix resistors with 0 ohm jumpers
- Resoldered all pin connections
- Replaced female through-board connectors
- Replace bad special solenoid 7408 chip - was locking-on rightmost pop. Went through 2 solenoid driver fuses before I tracked this down.
Other electronics:
- Replaced power cord plug with 3-prong plug (original had been cut off)
- Repinned 3J6 power connectors with trifurcon pins
- Replaced sound board capacitors
- Replaced sound board resistor R18 to reduce speaker hum
- Repaired broken harness connector for LH slingshot coil
- Repaired broken switch matrix connection at LH drop target bank
Other stuff:
- Reglued lower cabinet backbox support
- Relamped entire game, put blue LEDs in pops
Cleaned & Polished:
- All hardware, posts, etc
- Ball guides
- Pop bumper ring & rod assemblies
- Shooter hardware
- Coin acceptor cover, return slot, rejector
Painting &Touchup:
Backglass
- Cleaned & sealed
- Touched up with paint pens & spot mixed colors
- A few heat-worn areas reverse-painted
Playfield
- Magic Erasered to diminish swirl marks
- Remove old mylar & cleaned playfield
- Touched up with paint pens & spot mixed colors
Playfield Refurb:
- Cleaned drop targets, replaced DT stickers
- Added mylar to kickout drops
- Replaced pop bumper mylar
- Rebuilt pop bumpers, replaced several broken steel yokes
- Replaced all coil sleeves
- Replaced melted 3-bank DT coil
- New rubber rings
Pics:
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This pic shows the before / after repairs on the "1 TO 4 PLAYERS" part of the backglass. Heat or abrasion had worn away at the original paint. I found a close match at the craft store, masked & painted from the reverse. A simple fix that improves the appearance & still allows light to show through. |
| More pics: see the Gallery page |
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