TECH: Williams Transformer Voltages - ST:TNG

[Paul King]

I'm still trying to figure out what is going on with my ST:TNG machine. I'm
thinking it might be the transformer (5610-13791-00), but I'm not sure. I
measured line voltages coming from each pin, grounded to the ground strap
with no load (unplugged) and here's what I read - all volts AC:



(For all diagrams V is the mark on the bottom of the plug, and the numbers
above it are the pins where I measured voltage)



DMD



2

1

\/



1 - 56.5

2 - 40



GI



9 8 7

6 5 4

3 2 1

\/ \/ \/



1 - 8.2

2 - x - no pin

3 - 2.5

4 - 8.2

5 - 2.5

6 - 2.5

7 - 8.2

8 - x - no pin

9 - 2.5





MAIN



15 14 13

12 11 10

9 8 7

6 5 4

3 2 1

\/ \/ \/



1 - 7.6

2 - 1.4

3 - 13.4

4 - 1.8

5 - 46.0

6 - 18.5

7 - 48.0

8 - 28.4

9 - 7.4

10 - 2.2

11 - 8.2

12 - 3.7

13 - 305 mV - This looks bad

14 - 13.6

15 - 3.5





I'm not sure how to read these, but I understand this transformer is used in
the following pins:



IJ, JD, Pinball_Circus, Popeye, STTNG, TAF



Any pointers on if these are good or bad? Did I perform the readings
incorrectly?



Thanks,

Paul

[s***@excite.com]

I wouldn't check voltages that way - check at the power inputs to the
boards. Pin 13 for instance might "look bad" because it's 1/3 of a
volt, but it might be some kind of center tap situation, where the
actual windings used are not with reference to ground. (They did this
a lot of the time to get a certain voltage needed without having to
have another transformer)

[Paul King]

Post by s***@excite.com
I wouldn't check voltages that way - check at the power inputs to the
boards. Pin 13 for instance might "look bad" because it's 1/3 of a
volt, but it might be some kind of center tap situation, where the
actual windings used are not with reference to ground. (They did this
a lot of the time to get a certain voltage needed without having to
have another transformer)

OK, one of the reasons I went from the transformer was because the board
voltages looked like they weren't right. Tested in maint mode with the coin
door open, probe to the IDC, ground to the strap, here's what I have:

(Jumper - voltage from transformer per manual - (loop if any) - voltage I
read)

Power Driver Board



J101-1 - 9VAC - 3.1

J101-2 - 9VAC - 2.7

J101-4 - 13VAC - 7.5

J101-5 - 13VAC - loop 101-4 - 7.5

J101-6 - 13VAC - 6.7

J101-7 - 13VAC - loop 101-6 - 6.7



J102-1 - 16VAC - loop 102-2 - 2.2

J102-2 - 16VAC - 2.7

J102-3 - 16VAC - loop 102-4 - 2.5

J102-4 - 16VAC - 2.5

J102-5 - 16VAC - loop 102-6 - 2.7

J102-6 - 16VAC - 2.7

J102-8 - 16VAC - loop 102-9 - 2.3

J102-9 - 16VAC - 2.6



J112-1 - 9.8VAC - 6.6

J112-2 - 9.8VAC - loop 112-1 - 6.6

J112-3 - 9.8VAC - 6.1

J112-5 - 9.8VAC - loop 112-3 - 6.1



J115-1 - 6.8VAC - 2.2

J115-2 - 6.8VAC - 7.5

J115-3 - 6.8VAC - 2.7

J115-4 - 6.8VAC - 7.5

J115-5 - 6.8VAC - 7.5

J115-6 - 6.8VAC - 7.5

J115-7 - 6.8VAC - 2.3

J115-8 - 6.8VAC - 2.2

J115-10 - 6.8VAC - 2.2

J115-11 - 6.8VAC - 2.2

J115-12 - 6.8VAC - 2.2





Dot Matrix Board



J605-1 - 80VAC - 49

J605-2 - 80VAC - 42

J605-3 - 100VAC - 56

J605-5 - 100VAC - 50



Audio Board

J4-1 - 18VAC - 13

J4-2 - 18VAC - loop from J4-1 - 13

J4-4 - 18VAC - 13

J4-5 - 18VAC - loop from J4-4 - 13

J4-6 - 18VAC - 2.5

J4-7 - 18VAC - loop from J4-6 - 2.5



Perhaps I still don't know what I'm doing (not a surprise), but many of
these numbers look low to me. Is there something I should do differently?



Thanks!

Paul

[s***@excite.com]

depending on your meter you might not be able to measure the AC
voltages accurately - cheapies won't do it, but make sure you are
measuring the AC with the meter on AC! If you leave it on DC the meter
will not "lock" to a voltage, or it might just show an "average" -
which would be inaccurate as AC voltage goes from -xx through 00 to xx

[Paul King]

Post by s***@excite.com
depending on your meter you might not be able to measure the AC
voltages accurately - cheapies won't do it, but make sure you are
measuring the AC with the meter on AC! If you leave it on DC the meter
will not "lock" to a voltage, or it might just show an "average" -
which would be inaccurate as AC voltage goes from -xx through 00 to xx

The meter is not mine, it's a Fluke 83 digital multimeter and I've seen them
on ebay for about 100. It's definately set to AC - even reads AC on the
display.

Should I pull the connectors and measure in the holes instead of on the edge
of the IDC? I was afraid this might mess something up since some of the
connectors would be powered, and the one I pulled wouldn't be. Maybe I
should pull all of these connectors and measure then?

Thanks!
Paul

[martin]

Here are the numbers that you are looking for. The 13491 is the closest
match.

You have to measure across the pins as marked in my table. Measuring
against ground will not give good results.

http://iobium.com/wpc_transformers.htm

If your transformer is not smoking it is probably OK.

[RonKZ650]

like Martin said, you measure across the transformer, not to ground,
so for example have one probe on J605-1 the other on J605-2 and you
should get approx 80vac. That being said, there's still something
seriously wrong with your measurements J115-1 is ground, as is all
J115-1,2,3,4,5,6 pins. All them have to measure the same and should be
zero because they are grounded, so if you measure 2.2vac on some of
them and 7.5vac on sone of them, either your meter was not in fact
hooked to a good ground or there is a problem in the transformer wiring
to ground, burn't connectors etc.

[Paul King]

Here are the voltages - it doesn't look like the transformer, so I think
there may be a leak between the transformer and the boards. Any idea on how
to trace/measure these values at the boards? The way we did it before
(going to ground) doesn't appear to be correct as the values don't really
relate. I want to rule out the wiring from the transformer to the boards
next. If that passes, I'm not sure where to go next.

Thanks!

Paul

Measured Voltages (unloaded)

Transformer
Schematic
13491
Mine

1,2 (5V digital)
9VAC
9.96
9.86

3,4 (Flashers)
16VAC
17.25
17.07

5,8 (DMD 62V)
80VAC
86.3
85.2

6,9 (DCS #1)
18VAC
13.25
13.11

9,12 (DCS #2)
18VAC
13.28
13.10

6,12 (DCS)
36VAC
26.56
26.25

7,10 (Fliptronic)
51.4VAC
55.8
55.2

11,13 (12V digital)
9.8VAC
12.62
12.47

GI
6.8VAC
7.94
7.87

DMD
100VAC
108.4
107.7

Line (115V primary)
120VAC
121.2
120.5

[w***@earthlink.net]

Hey Martin!

That's an excellent document ! Do you have any information on earlier
Transformers? I'm trying to locate a 5610-09563-01 transformer like
what is found in BK. I'm wondering what other part #'s / games would
work as a replacement.

Any help is appreciated.

Steve

[martin]

Sorry, Steve - I have only documented WPC, 'coz that's all I have.

You could poke around the schematics a bit.