Pinballs

Continuing the preparations to turn the Kiss back on, some care had to be given to the electronic boards, starting with power and rectifier.

Pinrepair has proven very useful again, with a detailed section on the topic.

After checking the transformer's output voltages, we had to remove the raw hacks that were soldered directly to the board to bypass the Molex connectors that had partially melted (some pins see a *lot* of current flowing through, which can heat up the connector enough to melt it, especially when the pins are corroded), check it out:

To that extent, we gently sanded the male pins of the connectors so that they could shine again, and we replaced the damaged female connectors, as well as the lugs, using Trifurcon for those that carry a lot of current: all lugs of the J1 connector, lugs 1, 5 and 7 of J2 and 6, 8 (the connector broke there!), 10 and 11 of J3. Other can remain normal Molex lugs, but ideally Trifurcons should help a bit given the slightly larger contact surface.

It was then time to check tracks, and replace the fuses, check rectifier bridges and Varos, then plug back, connecting only J2, in order to check voltages at the test points. Transformer + rectifier are now working, we can move on.

The solenoid driver board (AS-2518-22). There again, thanks to Pinrepair for their exhaustive explanations.

Here's an overview of the board "as is":

Here's what we did:

• Replaced C23 (using a 10 000µF for lack of a better choice, but it seems to suffice) and C24.
  
• Upgrade of grounds (except for 43V, not yet convinced this is necessary) and bridging of the 5V tracks.
  
• Quick check of all transistors, Q2 turned out to be dead (shorted between Base and Emitter).

Finally the MPU board has been checked and upgraded following these suggestions, and a damaged 74L00N has been replaced.