Re: Tech: Em pinball




<kwing1000@xxxxxxxxxxxxx> wrote in message
news:1125126167.715728.275300@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> The Ball sitting in the outhole closes the switch to the outhole
> relay. Other switches such as one on the game over relay could prevent
> that from happening, but from your description the outhole relay is
> pulled in and locked on. (Which should cause the score motor to run but
> it does not.)


I don't have a manual so I feel like I am sort of swinging in the dark with
a wet noodle. I need to make sure we are talking about the same relays.

Thanks in advance for the patience.

Left/right/top/bottom when standing in the playing position

Underside of the playfield. With the playfield up against the backbox, there
is a relay at the the top above the left flipper mechanism that closes when
I actuate the outhole switch in the trough. It is labeled "ball trough
relay" with a sticker on the underside of the Pf.

There is also a relay in the bottom of the cabinet to the right of the
score motor(playing position) labeled "outhole relay". It is a stack of 5
groupls of switches which are moved simultaneousl when the relay attached to
it actuates. That is the one that closes when the solenoid fires properly.
The center switch sparks when it closes. When the outhole is not serving the
ball, this is relay is not activating.

I also notice that when I actuate the trough switch in the trough, a relay
on the inside of the coin door actuates. The relay is to the right of the
right hand coin mech. Does this have anything to do with anything? The game
is apparently set on free play with no coin mechs but when that coin door
relay actuates it moves two wire rods that stick out from the coin door into
the cabinet area where the mechs would be.


> The score motor will cycle and send a pulse to the outhole solenoid
> when you press the credit button for the second player because the
> motor circuit is being completed by another relay. This means that the
> circuit to the outhole solenoid is good.


Score motor. This is the motor with all the plastic wheels stacke front to
back in the bottom left of the cabinet and these wheels have stacks of
switches on top. Correct?

I can conlude that my outhole solenoid is properly wired. Just not firing.


> When you look at your schematic for the problem, you are not looking
> at the circuit to the outhole solenoid, you are looking at the circuit
> for the score motor.


I find the score motor on the schematic at the juncture of section 4 and 5
on the schematic. This schematic is numbered from top to bottom on the left
hand side 1-24. Score motor is oon the far right side and going right to
left it goes through the service jack and then it branches to 7 to 10 lines
depending how you count them. These are labeled "10c re", "25c re", "eject
re", "center target re", "M.B. ind-e", "coin re", outhole re", "reset re",
3000 re", "spcl reel reset re".

ON the schematic, the 10c and the 25c relays also connect to the knocker
coil and the replay step up eos switch.

I don't know what the replay stepup is, what it looks like, or where it is
located. Again, swinging in the dark with a wet noodle.


> There will be many things that will cause the score motor to run.
> You need to look for the circuit that goes thru an outhole relay
> switch.


The above mentioned has that on the schematic. Is that part of the switch
stack right of the score motor that has the 5 groups of switches


> The color code on the schematic should also tell you which
> switch. (Did you say that you reattached a wire to the outhole relay
> assembly? Did it go back onto the correct lug?)


I may have misstated. Further inspection revealed the label which says "ball
trough relay". That is the one that had the loose wire. It always actuates
correctly when the trough switch is depressed. When actuated but the outhole
coil does not fire, not only can I hear it close but it hums until the
switch in ithe trough is released.


> Sometimes a schematic and an couple of feet of wire with alligator
> clips on each end is all that you need to find an open circuit on an
> EM. Assuming that you have the game on and the outhole relay energized,
> start by jumping the switch on the outhole relay that goes to the score
> motor. (To eliminate a loose contact on a switch blade.) Then work
> outwards to each connection on that circuit, as indicated on your
> schematic, until you get a score motor cycle.


I am going to have to chew on this step for a while. Can I damage anything?
Can I zap myself?

Any hints for distinguishing the wire colors? The insulation is old and
dirty and hard for my old eyes to tell what colors are involved.

Do I clean the switches? What am I looking for? Lack of voltage? Loose
wires? Dirty switches? Maladjustment?

Does one of the above seem more likely based ton the fact that the machine
does this about 30%-50% of the time?



> You Can do this.


Thanks for the vote of confidence. I was thinking of doing a David Letterman
Late Night skit--does it sink or does it float? Take the thing out on the
back patio on the pinball cart and send it down the yard into the lake. Does
it sink or does it float? Perhaps I could sell enough video tapes to pay for
my investment?

:>)

Thanks to everyone for all their time.

I'll keep ya posted.

--
Otto

CARGPB11

My web page: http://home.bellsouth.net/p/PWP-Ottoslanding



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