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(Topic ID: 268879)

Lethal Weapon 3 Blowing F7 on PPB. Coils Locking On.


By the96stang

5 months ago



Topic Stats

  • 13 posts
  • 2 Pinsiders participating
  • Latest reply 5 months ago by PinballManiac40
  • No one calls this topic a favorite

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#1 5 months ago

I have multiple coils locking on on a data east lethal Weapon. They are the ball launcher, drop target coil, and left kick out, and maybe one other. It blows F7 with the two connectors (J6/J7 on the PPB) plugged in. When they are not plugged in the fuse doesn't blow. The power supply and PPB are new.

Where do I look next? The MPU and 6812?

#2 5 months ago

Sounds like your C2 at the very least is leaking on the original DE power supply, causing low or complete loss of 5volts to the MPU/PPB boards. If it looks wet underneath, that is the issue. All the other smaller capacitors need to changed as well.

#3 5 months ago
Quoted from PinballManiac40:

Sounds like your C2 at the very least is leaking on the original DE power supply, causing low or complete loss of 5volts to the MPU/PPB boards. If it looks wet underneath, that is the issue. All the other smaller capacitors need to changed as well.

Both power supply and ppb are new.

#4 5 months ago

You need to measure the 5v, 12v, and -12v. What brand are the boards?

#5 5 months ago
Quoted from PinballManiac40:

You need to measure the 5v, 12v, and -12v. What brand are the boards?

Rottendog

#6 5 months ago

My power is within spec on the power supply. 5.0V, 14.1V, 110V, -99.1V ect.

On the ppb at the 50V I have 74.5, no 28V at all, Very weird.

#7 5 months ago

The coils lock on when J6 is plugged in. J7 can be plugged in fine. Still no 28V. All fuses are good.

#8 5 months ago

Did you replace the power supply and PPB or they were in there when you got the game?

I think you measure all the coil resistances to see if there are any with shorted diodes, which basically would be any measuring less than 4 ohms.

There should be a fuse on the power supply for 28 volts. None are blown?

#9 5 months ago
Quoted from PinballManiac40:

Did you replace the power supply and PPB or they were in there when you got the game?
I think you measure all the coil resistances to see if there are any with shorted diodes, which basically would be any measuring less than 4 ohms.
There should be a fuse on the power supply for 28 volts. None are blown?

Positive none are blown. All have continuity. I bought the boards new.

I need to pull out each coil to test correct?

#10 5 months ago
Quoted from the96stang:

I need to pull out each coil to test correct?

No. You can test them with the wires connected.

Quoted from the96stang:

I bought the boards new.

You had the same problem with the original boards installed? Did you replace both boards at the same time or at different times?

#11 5 months ago
Quoted from PinballManiac40:

You had the same problem with the original boards installed? Did you replace both boards at the same time or at different times?

Same time on both.

All coils tested. None out of range.

#12 5 months ago

Looks like its higher up stream than I thought. It appears to be a bad 7408 on the MPU

#13 5 months ago
Quoted from PinballManiac40:

You had the same problem with the original boards installed?

Quoted from the96stang:

Looks like its higher up stream than I thought. It appears to be a bad 7408 on the MPU

I don't doubt that, but I was trying to see if your issue started because of the original power supply that was installed.

If the coil burned enough for you to see smoke, PIA might be damaged to. I hope not though. If the coil wrapper is not discolored at all then may only be lucky with the TIP122, 2Nxxxx and the 7408. You can use TIP102 in place of the TIP122.

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