Re: Sys 11B tech question / Earthshaker

John you are correct on the diodes. But it does not hurt to have
another 1n4004 on the coil. just make sure the banded diode lug
of the coil goes to power. a lot of people replace coils and the new
coil
has the diode. it doesn't hurt anything to have it there. hope that
helps.

On Nov 21, 9:01 am, "John Wart, jr" <johnwar...@xxxxxxxxxxxxxx> wrote:
I could be wrong, but Sys 11 games don't have diodes at the coil once the
Aux driver board is introduced. The diodes are now on the aux driver board.
I've had an Earthshaker before, and I verified the pics, no coil diodes on
it either.

I will try the grounding tab later.

These are not relay selected transistors.

"Borygard" <boryg...@xxxxxxxxx> wrote in message

news:78901403-7294-4bfa-a21b-0687a042cb52@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
John, don't worry about checking continuity here.  Momentarily ground
the tab of the appropriate drive transistor on the CPU to see if the
coil fires.  If it does, you know continuity is good from the CPU
through the Aux board to the coil.

Coils in system 11 games need diodes.  So my guess is not having the
diode on the coil took out the transistor on the CPU and/or Aux board
and it will need replacing.

Also, I'm assuming solenoid 13 and 14 use the same driver and are just
switched by the A/C relay.

On Nov 21, 1:15 am, "John Wart, jr" <johnwar...@xxxxxxxxxxxxxx> wrote:



Maybe my brain is just fried at 2 AM, but I'm gonna post here anyways at
the
risk of looking like an idiot if/when someone points something super
obvious
out :)

Background is, I'm fixing an Earthshaker up that has been hacked to death.
Found some cut wires, some wires soldered in the wrong place, a few ***
connectors hacked into the GI etc

Current problem is solenoids 13 and 14 are not working.
Solenoid 13 is the top ball popper
Solenoid 14 is the jackpot flash bulb

I'm trying to trace the wires out, thinking perhaps there are some broken
wires I've not found yet.

I can't get a continuity test from the brown and green wire at the ball
popper. But I'm not 100% sure if it should have continuity back to 1J12 on
the CPU, 5J2 on the aux power driver board or 5J6 on the aux power driver
board.
Transistors, resistors and diodes on the CPU and Aux power driver are
working correctly.
I tried a spare aux power driver board I had to rule the aux power driver
board out.
Yes, the coil has power on both lugs, and grounding the lug with the
single,
smaller wire causes the coil to fire.

Someone had replaced the coil for the ball popper with a new generic coil
with a diode. I removed the diode and it's still not working. I tested the
coil resistance and it's appropriate for a 23-800 coil.

Where should these wires buzz out to? The connector on the CPU board,
right?

--
--
--john

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