It was a repair marathon.
Repaired flickering displays due to cracked solder joints on displays.
repaired intermittent faults with lamps in back box and around back glass by re soldering cracked joints on aux lamp board.
Re-pinned and replaced housings on all wires to power supply / driver board which were causing various faults.
Re-pinned and replaced housings on all the remaining original housings on the mpu which were causing audio, display and reset problems.
Re gapped a lot of switch contacts that where triggering when the pop bumpers were activated.
fixed non working flippers and Adjusted flipper contacts and EOS contacts
diagnosed problem causing drop targets to intermittently reset for no reason
Fixed short in playfield lamps
Replaced faulty SCR's on lamp driver board
At one stage there one minute all the lamps were working next thing I new is 1/4 of the lamps were locked on, half wouldn't work at all and the last 1/4 worked fine.
1st I swapped the lamp driver board, then swapped the PIA on the MPU board (I didn't think the PIA was a problem because the displays were fine)
I then swapped the mpu board and still the same thing.
I then disconnected all the playfield switches, solenoids, solenoid driver board (except for the power supply section) sound board, aux lamp board and displays, still no better.
All that was left was the coin door, flipper buttons and lamps so I unplugged the lamps and tried connecting a test lamp to each lamp output at the lamp board and the out puts were doing the same thing as the lamps under the playfield
I then re connected the playfield lamps and unplugged the coin door, I thought I was wasting my time unplugging the coin door but all the playfield lamps worked properly. turned out to be a faulty lamp socket which was shorting one of the G.I. wires to the ground, I disconnected the faulty lamp socket and re connected the coin door and all was fine.
All of these problems were pre existing when Jango received the machine.
He does a wonderful job on restoring this machine.
While doing a lot of the non board related faults I fully explained how to diagnose and fix these faults to jango who now has a lot more confidence on repairing these type of faults in the future himself.
I was paid to rebuild 2 driver / power supply, rectifier and acid damaged mpu boards. He paid for 90% of the first air fair and part of the second air fair and I was happy to do all the labour for the above repairs to the machine free of charge because he paid for the board repairs and a large part of the airfare.
I am happy to do something similar to this for other interstate A.P members and Intend travelling down to Melbourne at least once a year for a week, to do the same for other members.
the plan is for a few members that need my help to all pay part of the airfare and some labour (to cover other costs related to the trip). In return I will get your machine up and running and teach you some fault finding and repair procedures. This has been suggested to me by a couple of people and I think it's a great Idea.
Unfortunately there was another member who i was going to drop by and help but because the fellow that was driving me around having a few other commitments, only being in Melbourne for 1 full day and 2 half days and other minor problems with time I was unable to help.
At least the trip was a success this time.
