(Topic ID: 197905)

Need Help... MPU not booting up - no LEDS lit


By donnPin

1 year ago



Topic Stats

  • 12 posts
  • 2 Pinsiders participating
  • Latest reply 1 year ago by donnPin
  • No one calls this topic a favorite

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#1 1 year ago

I am truly scratching my head. I was changing light bulbs on the playfield and had the game in test mode with lights flashing.l I have been told now I shouldn't have done that... I did. Now, when I turn the machine on, the MPU does not come on (no LEDS flashing). The MPU I have is a Altek and I tested the TP's and the two that are supposed to be 5 volts, are only reading .09 volts. So, I read the manual to the determine the problem. It indicated that I should check the solenoid driver board (TP1 I believe) for 5 volts. NO VOLTAGE there either! I studied the schematic and it appears that there is a reg (Q20 E-710 in the middle of the heat sink) that may have something to do with the power to the MPU. Without buying a bunch of parts and dragging this issue out, am I on the right path here? Can changing the bulbs with the machine in test mode create this problem? Thanks for any advice...

#2 1 year ago
Quoted from donnPin:

I am truly scratching my head. I was changing light bulbs on the playfield and had the game in test mode with lights flashing.l I have been told now I shouldn't have done that... I did. Now, when I turn the machine on, the MPU does not come on (no LEDS flashing). The MPU I have is a Altek and I tested the TP's and the two that are supposed to be 5 volts, are only reading .09 volts. So, I read the manual to the determine the problem. It indicated that I should check the solenoid driver board (TP1 I believe) for 5 volts. NO VOLTAGE there either! I studied the schematic and it appears that there is a reg (Q20 E-710 in the middle of the heat sink) that may have something to do with the power to the MPU. Without buying a bunch of parts and dragging this issue out, am I on the right path here? Can changing the bulbs with the machine in test mode create this problem? Thanks for any advice...

Lets start with what game? I assume a solid state Bally?

#3 1 year ago

Yes, Bally Mata Hari.

#4 1 year ago

Check your fuses on the power supply board, next to the transformer. Best place to start.

#5 1 year ago

Have tested the fuses and they are all good.

#6 1 year ago

Also checked the fuse on the solenoid driver board... good.

#7 1 year ago

Test all the voltages on the test points on the power supply board. Use your manual and be careful on your settings on your meter because you will have AC and DC test points

#9 1 year ago

Have already done so... All are good.

#10 1 year ago
Quoted from donnPin:

Have already done so... All are good.

Ok, on the solenoid board, on the right side there a 3 test points, a ground loop and 2 5v loops, Test for 5 volts at both of those.

#11 1 year ago

Test tips #1 & #3

#12 1 year ago

Tested. .07 volts. Should be 5 volts

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