Centipede no +5, all other voltages right on

dave2236

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Hello, Maybe someone knows off the top of their head.

I have a centipede with no +5. All the rest of the voltages are fine. I have checked the board with my Jamma to centipede adapter and the board works fine. I have 2 ARII boards and turning the pot to adjust the +5 does nothing. I have 0V on the red/white wire running to the board.

Fuses are all fine.

Any advice would be appreciated. I'm going through the schematic right now.

Do I need an ARII rebuild kit?

Thanks, Dave
 
Doube check your fuses and actually test them. Make 100% sure if its a fuse or not before you overthink the problem.
 
Fixed it. Actually a problem I have never seen before.

One of the orange wires under the power supply was rusted through. One of the orange wires running from the Big Blue to the MDA 3501. As soon as I touched it it broke the connection.

So I crimped 2 new ends on and reconnected everything. Adjusted the ARII board for 5.1 volts, installed my bad centipede boardset with graphic glitches in case something else is wrong so I wouldn't blow the good set.

BAM!, fired right up. Installed the good board, all set to play.

I now have jailbars and the trackball is horrible, so I will be fixing those 2 things tonight.
 
Bad playfield RAM and 4584 input buffer. :)

Check the test mode.

Fixed it. Actually a problem I have never seen before.

One of the orange wires under the power supply was rusted through. One of the orange wires running from the Big Blue to the MDA 3501. As soon as I touched it it broke the connection.

So I crimped 2 new ends on and reconnected everything. Adjusted the ARII board for 5.1 volts, installed my bad centipede boardset with graphic glitches in case something else is wrong so I wouldn't blow the good set.

BAM!, fired right up. Installed the good board, all set to play.

I now have jailbars and the trackball is horrible, so I will be fixing those 2 things tonight.
 
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