(Topic ID: 217522)

Police Force Working Yesterday...Not Today!

By Drumgold

5 years ago


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  • 45 posts
  • 8 Pinsiders participating
  • Latest reply 5 years ago by Drumgold
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#2 5 years ago
Quoted from Drumgold:

I opened the machine ans changed the three AA batteries

My first thought is if you changed batteries with the power off, it probably came out of free play, therefore either needs credits (try to trip the coin unit switches).... or reset to free play (adjustment #23)
http://www.ipdb.org/files/1841/Williams_1989_Police_Force_Operations_Manual.pdf

#12 5 years ago
Quoted from Drumgold:

I found the credit button but since the display board won't show YES or No trial and error will fix that until I get it up and running again.

First, double check the cables as the IDC cables often need repinning and ribbon cables are notorious for failing. Also check where those cables go to the cpu/power. Sometimes it isn't the end at the display board that is the problem. If your game has original gas displays, check that the high voltage is getting to them with a DMM/Voltmeter (carefully)

#22 5 years ago

+1

Quoted from Drumgold:

I checked the fuses and they are fine.

Is there voltage present at the fuse as measured with a voltmeter? It does no good to measure a fuse that has nothing there. It's like having a highway bridge in good shape with no traffic on it.

#26 5 years ago

Although, if your credit display is working the fuses and voltage will be good - as they also get the high voltage supply.

#30 5 years ago

Each display has its own resistor on its high voltage input. Since some of the displays work, HV is getting to the board, so it is not a fuse problem.

If your high voltage fuses are not blown, and your score displays do not work, first replace the 39k ohm resistors. These are cheap and easy parts to replace (a lot cheaper and easier than replacing score display glass!). Or at least check these. Replace these two resistors with "flame proof" 1 or 2 watt 39k ohm versions. And make sure you mount the new resistors slightly off the circuit board, so air can get under them for cooling.

#33 5 years ago
Quoted from Drumgold:

Ok, The fuses are both fine but...
F3 is showing around 220v but F2 is showing zero. Would this prevent both glasses from functioning?

The display supply is AC. One leg is +100 ACV and one leg is -100 ACV ....with respect to the AC ground of the display circuit. You are seeing 220V because you are measuring across from the -100 to the +100 (If you have about 110 VAC input, your net total is 220)

If EITHER fuse is blown, you'll have NO displays INCLUDING the credit display. It is electrically impossible for the gas plasma credit display to function if the HV fuse is blown

The 220 you measured is a little high. You should have closer to 95 to 105 on each leg, and it is recommended to modify the supply zener diodes to increase display life
http://techniek.flipperwinkel.nl/wms11/index3.htm#display

#35 5 years ago
Quoted from Drumgold:

Voltage here in N Ireland is 220-240.

Conversion of your 220-240VAC happens at the transformer, which is configuered with jumpers to accept different input mains voltages. The secondary outputs are still at their designed output levels (about 88.5VAC is the specification)

Quoted from Drumgold:

Do I need to change both resistors on F2 and F3 (both these fuses are intact) and are they easy to identify?

From the link above, you need to replace both zener diodes (not resistors). Keep in mind that this mod will not fix your blown displays. It is only designed to lower the voltage to increase their lifespan. There is a high probability that your displays are outgassed, and the higher input voltage you have presently may have accelerated the failure. The best option, in my personal opinion, would be to switch to digital displays. They do not require the HV at all, because they are only powered by logic voltage.

Increasing Score Display Life.
Glass score displays are getting very EXPENSIVE. Because of this, it is important to make your current glass score displays last as long as possible. The best way to do this is to decrease the 100 volts (which powers the displays) to 91 volts. This can be done by replacing the zener diodes at ZR2 (Z2) and ZR4 (Z4) to a lower voltage diode

The original diodes used at ZR2, ZR4 are 1N4764A. These are 100 volt, 1 watt zener diodes. If you replace these with 1N4763A diodes, which are 91 volt, 1 watt zener diodes, only 91 volts (instead of 100 volts) will power the displays. This will make your displays slightly less bright, but it will also DRAMATICALLY increase their life span! Since glass score display tubes are becoming so expensive, this is highly recommended.

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#37 5 years ago
Quoted from Drumgold:

Is there an issue at F2 showing zero on the voltmeter? And at F3 showing 220?

No.

Quoted from Drumgold:

Do I still need to replace "both zenier diodes" as you mentioned above?

Only if you want to use/continue to use existing gas displays.

Quoted from Drumgold:

will replacing the non-functioning displays with a new LED display solve the problem?

Yes

Quoted from Drumgold:

Also, I don't know if it important but, there are three red lights glowing on the backboard. The middle light is continually flashing; it says DIAGNOSTICS directly below.

This is normal

#39 5 years ago

Replacing the zener diodes will not bring those displays back to life. The LED displays are pricey, but when you need to replace gas displays, the prices on those are going up as well - and when you replace those, what happens if they also soon fail? At least the LEDs promise much longer lifespan.
There are several manufacturers of digital displays, PinScore is one, and they are in stock at Marco. Easy to install, the install instructions are right here on Marcos website:
http://www.marcospecialties.com/pinball-parts/PS-12232-R1

#41 5 years ago
Quoted from Drumgold:

Finally...Is there any way to check and make sure that the original gas displays are the problem? I would hate to order new LED displays only to find that they were not what was wrong.

The only way to verify with certainty would be to replace the display glasses, if they can be found.

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#44 5 years ago

Thanks!...it wasn't a big deal, glad to help and I appreciate the offer! The last time I had a Guiness was in the form of an Irish Car Bomb cocktail at NY NY casino in Las Vegas. (Is that an acceptable drink there?)

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