Re: System 80 relay probs

Hi Andy,

a question first, and then some thoughts...

Q. If you manually "energize" the game over relay do you get the 24VDC
power to the flippers, pop bumpers, etc.?

1. Check F6. This should be an 8 amp, slo-blo fuse. This fuse is for the
24 VDC. My guess is this should be okay, because your memory relay DOES
energize.

2. Check the integrity of the switches on the tilt relay. If they are
misadjusted 24VDC power will not get to the flippers.

3. Check the integrity of the Q relay switches.

4. You may be on to something with the Z1 chip on the driver board. Do you
have a logic probe? It would be helpful to compare the pins of Z1 with the
corresponding pins on another 74175 chip on the driver board.

5. If none of this ideas help you may have to look at the connector pins in
the A3J3 connector (ughh).

6. As for your memory relay, I do not know the game play of Force II. Are
there memory drop targets? Again, if you think there is a problem with its
activation its associated 74175 on the driver board needs to be examined.

Regards,
Dan

"Andy" <flynn50272@xxxxxxxxxxx> wrote in message
news:1142547325.488631.123130@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I am currently trying to fix a system 80 Force II pin for a friend.
When a game is started the pop bumpers,slingshots and flippers won't
work. I have managed to trace the problem to the fact that the game
over relay isn't energising when the game is started thus preventing
the coil voltage from getting to the coils.
There are three relays situated alongside each other under the
playfield; game over, tilt and memory relay.
When the machine is first switched on the memory relay is momentarily
energized.
When a game is started the game over relay doesn't energize. Similarly,
the tilt relay won't energize when the machine is manually tilted.

First question: Is the memory relay working correctly?
Secondly, both the game over and tilt relays associated MPS U45
transistors test OK. Both of these are driven by Z1 a 74175 chip on the
driver board. My initial thoughts are that this chip may be faulty.
What should I be looking for on the inputs and outputs of Z1.

Other than the above the rest of the game is OK :-) (sounds OK, scoring
OK etc. etc.)

Any help greatly appreciated.

Andy



.

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