Port Matilda, PA
Quoted from sunshine131:How do I make sure it is on free play?
1st game selector dip switch up.
(Topic ID: 257497)
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Power supply voltage is good. Your 5V section is weak on SDB & MPU. The 5V is needed at the MPU to start the boot process.
Quoted from sunshine131:I switched the 1st game selector switch up, it was down. There are no flashes on the MPU, just the red overvoltage light on steady.
Least of your problem. That setting does nothing to the start up sequence. The red light means your missing the 5V at the MPU. Were the connectors repined? Housings look new.
Check your SDB plug J3 pins 16 & 17, they send the 5V to the MPU. See if you have 5V at the connector.
Quoted from sunshine131:.1VDC at the connector.
Assuming you have a schematic, double check all the connector wire color to each connector pin on the SDB J3 & J4.
Quoted from barakandl:A circuit board likely has a short. You can use a DMM to check resistance from the 5v to ground test point on each board and see if any read 0 ohm or close to zero ohm.
Could also plug in one board at a time looking for the one that is dragging down the 5v.... but that can be kind of dangerous if the short clears it self with brute force... like a capacitor explodes.
It's running Alltek boards which in my experience are pretty rock solid. Rectifier voltages are good. Unless a pin was repined to the wrong wire, I'm thinking connector issue.
Quoted from Startek2:i bet if you pull up on the long connector on your power supply board it will start to work....probably a bad solder joint on the pins....very common.....
New board.
Schematic is available here:
https://www.ipdb.org/files/4499/Bally_1977_Evel_Knievel_Manual.pdf
Print it out and check your work.
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