Troubleshooting Bally EM's
Neonkiss:
This is a re-post from Oldreno. ;)
Troubleshooting the Bally EM
Here are a few tips I can pass on to you when restoring those wonderful Ballys.
I don’t know that this is the proper forum for stuff like this, or there is any interest.
If there is, I will be glad to post further stuff. Hopefully other old-timer Bally mechanics will input their thoughts also….
The clock.
Often the bull-gear (largest gear) will wear thin and stop the clock. The reels either won't index, or the switches won't close fully to allow pays. When the handle is pulled, the bull gear rotates 1/4 turn to fulfill its function. When that part gets too worn, simply drive out the drift pin and rotate the gear a quarter turn. The holes for the drift pin should line up, drive it back in and you now have another 100,000 miles of play.
You can also somewhat change the spin speed (not much) by bending closed or open the fan blades. No real reason to do that tho'. Another way of quieting down the clock is to put a polite layer of grease on the metal gears in the clock. This not only makes it more quiet, but slows it down just a bit. Also some heavy grease on the outside & inside pivot holes helps.
The reels.
Occasionally the reel screws will come out and you have a one in 4 chance of putting them back on the disc correctly. A quick way to find out the right way is to index the reel wiper arms into the deepest cut on the reel disc. This deepest cut is generally the high pay. Now line up the reel so the 7 or highest pay is on center line, and you should see the 4 screw holes line up correctly. Put a bit of silicon on the screw thread & they shouldn't come out until you decide to take them out.
The reel wipers will sometimes come loose. To position them correctly, push back the reel wiper arm roller all the way, and then line up the wiper buttons with the back set of contacts. That works out to be pretty close to right on in most cases. After adjusting check a mid-pay and a low-pay for proper index. Fine adjust accordingly.
Switches and switch stacks.
The A, B, C, Coin Relay, and dashpot switches were designed to be somewhat self-cleaning. The convex and concave portions wipe as they contact and that keeps them clean. It is important to not remove that convex/concave area by filing the switches. Don't to it. Use either a burnisher, a fine thin flexible piece of flat metal, or a business card after spraying with contact cleaner. Gently pinch the switches together & rub the card back & forth between them. When adjusting switches for good contact, look and see that they 'push' on each other, and also that when open they are full open. Adjust switches by bending them at the stack, not at the end of the switch. Check your fiber insulating pieces that keep the switch sections apart. For example, the C switches contain several switches operating different circuits. Don't let the wrong circuits contact each other. You might want to gently tighten the micarta-insulator stack, they sometimes get a little loose, especially in dry climates like Nevada.
Hopper rebuilding.
Since parts are unavailable, you’ll have to fabricate your own.
The zero stop bumper for the hopper reset is one part. It is a thick disc of rubber, and when the hopper spiral is reset it stops against the bumper. You may have to find a good piece of rubber about the same thickness as the old bumper, and cut out a circle about the same diameter. Now punch a hole in it. Don’t punch it in the middle, make it offset. The bumper was originally designed offset so you could precisely adjust the hopper wipers. If they reset too far forward, they’ll short pay by one coin. If they are too far back, they’ll overpay by one coin. The eccentric design of the bumper allows you to adjust for this. Also, be aware that there are two bolts holding the hopper board to the backplate. You can loosen and adjust the hopper board also to prevent mispays.
The torsion spring being wound too loose on the back 100 tooth nylon gear will give double steps and needs another ¼ turn or so to stop those short pays. Proper winding on the torsion spring is about 2 and one half turns max. Any more than that and it may bind on high pays and run-away. Make sure you step it all the way up to the max pay after adjusting the spring to check for binding.
Hopper short pays-on high pays.
When a hopper board pay circuit powers up via 50V through the reel boards, there is also another pay segment which is powered. That is the CO or Carry Over segment. It is typically found at about 75 steps on the hopper board. When a high pay (100 or 200 coins) is hit, the payout relay stays energized through the outboard wiper fingers on the hopper carriage. These fingers are just about impossible to adjust to exactly 100 coins, so their function is to provide power until the inboard spiral wipers get stepped up onto the Carry Over. As you notice the carry over stops at exactly 100 steps. If your machine stops paying before the 100 coins is finished, then probably your outboard wipers are going off their segments before the inboards hit the CO. Simply loosen the 2 screws and move the outboard wipers until they stay on circuit until after the inboards hit the CO. I generally adjust so they go off about in the middle of the CO circuit. The CO will accurately give you the correct pay.
Also, on some models there is a CO for 40 and 50 coin pays. Same thing applies.
Thanks,
Oldreno
Neonkiss:
The two types of 'zero stops' for the bally hoppers are the pencil-erasor type you mentioned, which is adjustable by a nut and allen head screw. This kind allows you to move the stop up or down to adjust the zero position accurately. It is an improvement over the original. The original looked kind of like a rubber nickel, with a hole drilled offset. this offset allowed you to adjust the bumper eccentrically, either to a thin spot or a thicker spot depending on how you wanted the wipers to reset. When tightening the eccentric, you had to get it into position, and then firmly hold it in place with your thumbnail to get it to stay while you tightened the bolt.
After adjusting, if it is too far one way or the other, you will either have a 1 coin short pay, or an occasional 1 coin overpay, or unneccesary wear on your 100 tooth white nylon gear.
Really nice wonderful old machines.
Thanks,
oldReno
Neonkiss:
Troubleshooting Bally EM’s II
Here are a few more tips on those wonderful Ballys.
There seemed to be enough interest, so here goes….
No handle release
In order for the handle paddle to drop, the handle release coil must first be energized.
This happens on the upstroke of the coin in switch, after the coin has pushed down the switch, and fallen off.
If a coin is holding down the switch, then you will never have upstroke, and the handle won’t release.
A very quick way to notice this is to look for the ‘Coin Accepted’ light to be on.
When the first coin in pushes down the coin switch, the coin relay assembly is tripped. This is on the lower left side of the reel mech in the back, & is a latching relay. It is tripped electrically on downstroke, and reset mechanically during handle pull.
Among the switches on the coin relay are the circuit to the handle release coil (N.O.) and the coin accepted light (N.O.) and others.
So if coin accepted light is on, the coin relay is probably ok. Then check your handle release coil and switches, and also check the dashpot switch. A little tug on the pump arm will often close an open dashpot. & you may hear handle release coil engage. There are a lot of other switches involved in upstroke & if I had a schematic I could tell you more…. I think the circuit involves going through the payout relay on hopper, and C switches on the reels, but again don’t have access to a schematic.
Once the handle release coil trips, then and only then can you get 2nd coin odds, 3rd coin etc.
Checking machine for shorts.
The two outputs of the secondaries of the transformer are 6V and 50V. These are isolated circuits, and as I recall do not ground to case. The wires are solid blue (6V.) solid orange (50V), and solid yellow (the common wire) Shorts can cause many problems.
To quickly check for shorts, pull out the coin acceptor, and quickly touch a small pocket screwdriver to case, and then short it to the orange wire on the lockout coil. If you see sparks, or the machine dim, then you’ve got a short. That checks the 50V. To check 6V, touch your screwdriver to case and quickly touch the blue wire coming from one of you door incandescent bulbs. (insert coin lite is a good one.) Again, sparks or the machine dimming are an indication of a short. The door bulb sockets are notorious for moving and touching to case. If you have the inclination you might want to put some heat shrink on them.
Next pull out, one at a time, your reel mech, top unit, and hopper, checking each time to see if the short disappears. If it does, then you have isolated it to any one of those units. Look for wire touching to case of any of those units, and correct the problem.
Be careful with shorts, I’ve seen one melt a good portion of a nickel stuck behind the coin acceptor arcing across the coin lockout relay.
Be aware that some operators would build an intentional short into the machine to stop cheating.
This is usually found as an orange wire soldered onto the coin lockout coil, and then with a fork-connector fastened to case with a screw. Remove this before checking for shorts.
Thanks,
Oldreno
Neonkiss:
Troubleshooting EM's Part lll
The Bally ElectroMechanical is the forefather of modern gaming. Many disagree, but I still think so.
While one-armed bandits dominated the scene for decades, the Bally opened the door to the modern wonders (?) of todays gambling.
Built long before flip flops, shift registers, and 4-bit architecture, it was a very sophisticated combination of electrical mechanical interfaces. In fact the 'money pin' paddle-less pinball machine was a prime example of EM technology gone wild. One of the harnesses is about as thick as my forearm...and it's not user friendly.
The EM is not only almost infinitely repairable, but is amenible to many modifications
I remember making parts in the shop to repair EM's because my slot manager was too cheap to buy parts.
Also, it had a 'different' pay structure, hit frequency, and randomness than today's machines.
Frequent low pays, many lower jackpots, and an easily changeable reel structure were great advantages.
Imagine, a one in 8,000 chance of hitting a jackpot!
How to check voltages and fuses.
This is something that can be done without opening the door.
If the fluorescent lights are on, and either the 'Insert coin", 'Coin Accepted", or "Winner Paid" lights are on, then you have 120V, 6V, and those fuses are good.
The remaining voltage, 50V can be checked by slightly pulling the handle and listening for the coin lock-out coil (on the door, behind the coin acceptor), to click in and out as you nudge the handle.
If you are missing some of the above, check your 3 (4) fuses behind the hopper.
If they are all good, look in the left hand corner of the machine behind the hopper.
That's where the time-out switch lives and lurks.
Time-out switch and Safety Timer.
Behind the hopper, left side of cabinet, generally.
The front of it is identified by a red pilot neon light, and a white push button.
If that light is on, then your hopper has run-away, timed out, and turned off the machine.
Push the white button next to it, and you should see power come up.
The safety timer is generally set for 45-90 seconds for a single coin machine, or 5-10 seconds or so for a multiple coin machine.
Do NOT adjust this with the machine plugged it.
On the back of the safety timer, between two nutted posts (caution) is another button. This button turns off the machine physically if you want to put it out of service, in addition to being the hopper runaway cutoff circuit.
In some models you may see a little push lever below the front of the hopper. This was installed by Bally to allow you to turn on the machine without having to pull out the hopper to push the reset button.
Generally a mechanic would reach behind the pilot neon and turn off the machine by hitting the back button.
Let me suggest a word of caution. Do not be holding on to the door or other metal parts while you push the 'off' button. There is some pretty heavy voltage going across those two nutted fasteners on both sides of the off switch.
If you short yourself across them, you WILL pay attention. We soon learned just how wide our fingers were, and arched them so we wouldn't touch the darned things.
The safety timer relay and motor kills the 120V to the machine.
Unplug your machine, and practice this maneuver until you're comfortable with it.
The safety timer is a 120V motor, slow turning, which moves a little wheel and metal tab (arrow) to the kill switch during payoffs. It makes a full turn in about 120 seconds.
If the timer bar hits the off button before it is reset, off goes the power to the machine.
We don't want it to time-out during proper pays, so, in the case of a single coin machine, this timer bar is set for about 45-90 seconds. (Actually I forgot the settings....)
If the pay is not made by then, then there is a possibility of a runaway pay or a dry hopper causing that condition.
This is generally enough time for making the highest pay (200 coins)
The case for multiplier machines is another whole story.
Thanks,
oldreno
Neonkiss:
Troubleshooting EM's Part lV
Multiplier Hopper Payoffs
Bally had several ways of counting payoffs. One was a mechanical linkage from the coin out roller, to physically step up the white 100 tooth hopper count gear.
Another way was to allow the coin out roller to pulse a set of switches which then powered briefly a 50V step up coil, to electrically step that gear. A third way was to use a hybrid combination of both in the case of a 'double up' machine.
The mechanical linkage system was built for single coin machines, 3-line jobbies, buy-a-pays, and 5-line criss-cross machines. You know, the ones which were not multipliers.
They were all pretty much straight pays.
The multipliers, however, can pay in progressing increments of 2, 3, 4, 5 or more coins bet per game.
The solution here is to count the pays through the mulitiplier wheels (x2, x3, x4, etc.) found in the top unit.
The Odds step up relay in the top unit is involved here, but that's discussion for another time.
(to watch your top unit work if you have no jumpers, simply remove the 4 screws holding the odds lights to the top unit frame, and pull that wooden piece forward. You can then watch the odds work and the X-units step during pays and work the relays to see how they operate.)
If one coin is played, no multipliers are used, and the step up coil is pulsed once for each coin out.
If 2 or more coins are played, then that specific multiplier is chosen to interface with the coin out step up coil.
In the case of the X2 circuit, for each coin paid out, the X2 coil steps once. However, becaused of the nature of the X2 board, only every second step of the board assembly causes power to get down to the hopper step up coil.
So, in essence, 2 coins are paid out, and the step up coil steps the payboard only one time.
Same thing occurs for all other multiples of coins played.
The X3 board is (you guessed it) only wired to count the hopper every 3 coins out.
Etc.
Why?
Good question.
It's what they had then.
On the back of your hopper payboard, mounted on the 100 tooth white plastic paygear, you will see another circular plastic piece which has notches in it. Also, there is a little tiny switch which rides on that outer ring. Every 5 steps of the payboard, the switch falls into that notch. This is an indication to the machine that the payboard is stepping up correctly.
IF the little switch falls into the notch during a pay, then this in turn indirectly temporarily cuts off power to the safety timer relay. This relay, timer motor, & cutoff bar you remember, are trying to hit the power down switch on the safety timer to turn off the machine. Also recall that it has a built in return spring.
If the hopper starts paying, and the payout count disk does not move, thus resetting the timer, then the machine will black out.
Not, after 45 seconds, as in the case of a single coin machine, but within 10 seconds or so, however you have it set.
This will stop runaways sooner, and allow less money to be lost in the event of a malfunction.
All this X-unit selecting is done by the odds disc which is reset when needed on the first coin in of the next game, and, I believe, makes its first step after the 2nd coin inserted.
oldreno
Navigation
[0] Message Index
[#] Next page