(Topic ID: 132198)

Amazon Hunt drop target issues


By Toyguy

5 years ago



Topic Stats

  • 7 posts
  • 5 Pinsiders participating
  • Latest reply 5 years ago by Inkochnito
  • No one calls this topic a favorite

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#1 5 years ago

I'm hoping someone may have some insights into this, or seen something similar. Our co-op has an Amazon Hunt that is blowing the F11 fuse. The first time it occurred we thought we had tracked it down to a bad coil, so we changed that to no effect. More troubleshooting led us to suspect the transistors for the right drop target bank, specifically the reset ones if I remember correctly, might be internally shorted. We pulled and replaced those and everything worked fine. We played quite a large number of games with no issue, until we came in the next day to find that the banks would not reset when a game was started. Sure enough, it was blowing the F11 fuse again within 5-10 seconds of power on.

This time we took no chances. We replaced all the coils on both banks, and all the transistors associated with them. We also inspected all the ground mods and straps and tidied up any questionable ones. Again, all worked well after this for a large number of games. The next day, however, after a couple of games were played, the drops didn't reset on a new game and F11 was popping again.

The guy who owns the machine is willing to invest in it but we'd like to keep his cost down if we can. We're leaning toward some sort of power supply issue but we'd rather not have him buy one only to find the problem remains, though it may come to that.

If anyone has any thoughts on what might be going wrong here and causing this thing to essentially short out the transistors every few cycles, we'd love to hear them.

Dave

#2 5 years ago

Dave, If F11 is power for all solenoids then perhaps just because the drop targets are not resetting the problem may be with a pop bumper, slingshot, knocker coil or associated driver transistor.

What I would do is replace F11 and with power on, quickly examine all solenoids to see which one is locking on, then power off.

The driver transistors can be shorted because of extended on-time of a coil, shorted coil, or because the coil diode is failed. It is unlikely that it is a related to the power supply.

#3 5 years ago
Quoted from minnesota13:

Dave, If F11 is power for all solenoids then perhaps just because the drop targets are not resetting the problem may be with a pop bumper, slingshot, knocker coil or associated driver transistor.
What I would do is replace F11 and with power on, quickly examine all solenoids to see which one is locking on, then power off.
The driver transistors can be shorted because of extended on-time of a coil, shorted coil, or because the coil diode is failed. It is unlikely that it is a related to the power supply.

I'll let Dave answer for sure, but I think F11 is just for the reset and trip for the left and right target banks.

#4 5 years ago

Yeah, F11 is only associated with the drops. Once the fuse has blown, all other functions of the game continue to work fine.

It is truly a weird one...

#5 5 years ago

If you have the manual could you post a pic of the solenoid schematic page?

Which transistors did you replace? Maybe one of the pre-drivers is failing too...

#6 5 years ago

I'll see if I can grab a scan of the schematic, but we also changed the pre-drivers at the same time we shotgunned the drivers and coils.

#7 5 years ago

Shoot me an email, I've got a pdf.

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