Thursday, July 9, 2020

Bosconian Arcade Cabinet Restoration & Repair - Part 2

After the third layer of Bondo was applied and hardened, I did one final sanding job. Then I used 6 new, longer screws to re-attach the metal feet plates for the front corners. It is finally time for the fun stuff; the electronics!

The original power cord was 2-prong and had to be replaced. I had a spare 18 AWG cable that I hacked the end off so that I could tie it into the AC filter. Matching the wire colors from the cable to the AC filter of a Bosconian may be confusing to someone that has worked on a Galaga cocktail cabinet at first glance. Bosconian upright is GND/Neutral/Hot. I have included a picture of the proper wiring. Note the insulated connectors I have used on the ends of the spliced power cord wires. They are not hard to find online or more preferable to me; your local small hardware store business. Always ensure an insulated connection from the wall to the AC filter!

Wall to AC wiring

Then, the monitor was removed for repairs. Wells Gardner k4600. I have only successfully worked on the k7000 model before this which has a more simplistic design. I gathered these are harder to work on, but very dependable once they are fixed.

After discharging and removing anode cup, then removing from cabinet.

Yes, harder to work on indeed. I have 2 daughter cards to deal with here. This requires me to not only replace caps on these boards but also the solder joints to the connectors on the end must be re-flowed. Of course, I also re-flow the neck-board connection joints and other worn-out or "cold"-looking joints.

Slowly pulling in each direction after removing the factory goo, the neck-board comes loose.

Also have to de-solder this width coil on both ends before removal.

k-4600 main chassis, 2 daughter boards, and external transformer.
Lots of things to replace. I used up every bit of the k4600 capkit with exception to a pot that came with it that I could not envision fitting to the board. Hard to stick something in that has 3 legs into a spot for only 2.

After putting it all back together and installing the power supply kit, everything powered up and the game plays. Now I have a a benign PCB issue and a horizontal hold issue with the monitor left as the only things bothering me.. to be continued!