Meteor
Stern Electronics, 1979You're currently viewing posts by Pinsider lindsey.
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Could definitely be a connector issue. There are a lot of preventative maintenance problems with these old games.
I would start by checking the voltages at the MPU, as mentioned. Solenoid fuses seem to like to blow for me when I move games which would cause the MPU LED to lock on, though I would expect that less with the new fuses which would be in the new rectifier board.
Quoted from barakandl:Blown PF solenoid fuse would do nothing. Game would boot. Blown rectifier 43v fuse will stop the zero X timer, so with that failure it would flash up 6 times and fail the 7th POST flash.
Actually, it wouldn't do nothing and the game would NOT boot. But you're right about the 7th flash. Remembered later that we're talking Bally and it would flash 6 times. Whoops 
No +12V would also cause the MPU LED to lock on as it's part of the reset circuit.
Quoted from barakandl:The PF solenoid fuse is just for the 43v on pf. This fuse does not interupt the MPUs 43v line it uses for zero crossing. Blown pf fuse game will boot, chimes, flippers, knocker work, but no PF solenoids. Blown 43v fuse on the rectifier board = no boot because no 7th flash.
The LED on the MPU is powered by 12v and not 5v. No 12v, No diag led.
Right. I was referring to the fuse on the rectifier board when I said "solenoid fuse". I didn't notice that you thought I was talking about the PF fuse because that wouldn't make any sense at all. Like you mentioned, the playfield fuse is after the bridge and after the flippers so it wouldn't cause the MPU to not boot. I blew the diagnosis, but I haven't completely lost it 
Quoted from barakandl:This is incorrect. Stuck slam switch will cause the game to reboot once attract mode starts and repeat over and over. It will not stop the power on self test flashes. Trust me on this one. The software is not monitoring switches until attract mode. You can try it yourself, hold closed the slam switch on the coin door.
Agreed. Take a look at the schematic. Slam switches are in the switch matrix and the CPU has no way to know what the switch matrix is doing until the game code is running.
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