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Bally Williams service button problem

P

Purchase

Registered
1 10 Years
Joined
Oct 25, 2014
Messages
64
Location
Rain forest
Hi, i am having trouble withe the service buttons on my machine. The enter and volume up buttons work but the volume down and credit do not. I replaced all 4 buttons and still the same problem. Tested for continuity with the meter ans there is no loose/cold joints from the buttons to the connector. Help!!

Cheers in advance
 
Was it working yesterday? Has it been stored etc. Bit of background info please..
 
Arv said:
Was it working yesterday? Has it been stored etc. Bit of background info please..
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Been like that since i got it. The credit button was sticky so i waited until i sorted everything else then replaced all 4 buttons. With no joy
 
That's what happened on my bsd, good old battery damage
 
Arv said:
That's what happened on my bsd, good old battery damage
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Clean as a whistle. Everything else on the machine works as it should. Really lost on this as there is zero info on the net about it. One thing though, at the minute i dont have the tilt or plumb bob plugged into the board as i have just gotten it all back together. So it might be the board that is shot. Coin mech, start button, launch button and flippers work fine though
 
The dedicated switches go straight to the CPU board, as said above alkaline damage from the batteries
even if it looks clean damage may be hiding under the I/Cs LM339s (IIRC) corroded tracks .
 
Look for corrosion on the legs of the chips underneath the batteries.

Take photo and post it here..
 
Knowing coin door wiring, it wouldn't surprise me if it's a broken wire(s) between the buttons and connector... but do post the picture of the MPU first to see if there is any corrosion involved.
 
Moonraker said:
Knowing coin door wiring, it wouldn't surprise me if it's a broken wire(s) between the buttons and connector... but do post the picture of the MPU first to see if there is any corrosion involved.
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Some pics. Hope these show whats what. Cheers for all the help so far. Really appreciate it!
 

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They certainly look clean I can't quite remember off the top of my head which chip the buttons go through possibly one or both of the 339s
Check you have continuity between buttons and Cpu board if you have then I strongly suspect one of the I/Cs is at fault this is what happened to my m/c when I had very similar problems to yours.
 
Johnnyo said:
They certainly look clean I can't quite remember off the top of my head which chip the buttons go through possibly one or both of the 339s
Check you have continuity between buttons and Cpu board if you have then I strongly suspect one of the I/Cs is at fault this is what happened to my m/c when I had very similar problems to yours.
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You will have to explain that a bit more!. I did test continuity between the buttons and the connector that goes into the coin door interface board and there was no problems there.
 
Hi, Purchase,

The four coin inputs and the four test buttons are all 'D' (Dedicated) switches, and register by connecting to Ground/Earth, so I suppose you could determine if the Cpu board or the machines' wiring is faulty by disconnecting J205 (bottom left of pcb, 12-pin connector) and using a jumper wire to ground the relevant pins of the cpu board;
  • Enter, Switch D8, is pin 8
  • Volume Up/+, Switch D7, is pin 7
  • Volume Down/-, Switch D6, is pin 6
  • Escape/Service Credit, Switch D5, is pin 5
If the button functions work when using this method, the wiring's broken somewhere, but if they don't then the Cpu is faulty. The switches affected access the data lines via diodes D11 & 12, 'comparator' circuits in U16, and U15.

Incidentally, I notice in your pictures that the erasure window in the program E-PROM, U6, isn't covered up. There's a faint chance the program could be affected by exposure to light; the erasure devices use prolonged UV light, but it's best to cover the window.
 
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Jay Walker said:
Hi, Purchase,

The four coin inputs and the four test buttons are all 'D' (Dedicated) switches, and register by connecting to Ground/Earth, so I suppose you could determine if the Cpu board or the machines' wiring is faulty by disconnecting J205 (bottom left of pcb, 12-pin connector) and using a jumper wire to ground the relevant pins of the cpu board;
  • Enter, Switch D8, is pin 8
  • Volume Up/+, Switch D7, is pin 7
  • Volume Down/-, Switch D6, is pin 6
  • Escape/Service Credit, Switch D5, is pin 5
If the button functions work when using this method, the wiring's broken somewhere, but if they don't then the Cpu is faulty. The switches affected access the data lines via diodes D11 & 12, 'comparator' circuits in U16, and U15.

Incidentally, I notice in your pictures that the erasure window in the program E-PROM, U6, isn't covered up. There's a faint chance the program could be affected by exposure to light; the erasure devices use prolonged UV light, but it's best to cover the window.
Click to expand...
Ok. Just so as i dont blow something up, i put a wire from where to where and press the buttons that are not working? Sorry if i am coming accross as dumb, never really messed with boards before and as i say, dont want to make matters worse. I do understand what connector/ pins i am after, but what one am i looking for (from left to right) and am i going from ground on the button panel or positive?
 
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Take the connector housing/wires off J205 of the Cpu board. Then use a length of thin wire between one of the exposed pins and an earth point, e.g. the point nearby on the base of the backbox, where the earth braid from the cabinet is attached. If the board is o.k., jumping pin 8 should put the game into test, pin 5 bring it out again, pin 7 increase volume and pin 6 reduce it.
 
I've uploaded another pic. Check in between pins 3 and 4 on the bottom right row. Looks damaged? Also, by lightly pressing the board in this area when in the back-box and turned on, it turns the volume down and adds a credit at the same time. Fishy
 

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Jay Walker said:
Hi, Purchase,

The four coin inputs and the four test buttons are all 'D' (Dedicated) switches, and register by connecting to Ground/Earth, so I suppose you could determine if the Cpu board or the machines' wiring is faulty by disconnecting J205 (bottom left of pcb, 12-pin connector) and using a jumper wire to ground the relevant pins of the cpu board;
  • Enter, Switch D8, is pin 8
  • Volume Up/+, Switch D7, is pin 7
  • Volume Down/-, Switch D6, is pin 6
  • Escape/Service Credit, Switch D5, is pin 5
If the button functions work when using this method, the wiring's broken somewhere, but if they don't then the Cpu is faulty. The switches affected access the data lines via diodes D11 & 12, 'comparator' circuits in U16, and U15.

Incidentally, I notice in your pictures that the erasure window in the program E-PROM, U6, isn't covered up. There's a faint chance the program could be affected by exposure to light; the erasure devices use prolonged UV light, but it's best to cover the window.
Click to expand...
Jay
i use 2pieces of wire with a diode in the middle when i have done this in the past !!
is it ok if you just use 1 piece of wire?
 
Working now!! The earth braiding in the back box was touching the back of the board. Just typical that the 2 buttons it affected were the same 2 that needed replaced in the first place. Thanks to one and all for the help and suggestions given to me on this. Top forum
 
carl lawrence said:
Jay
i use 2pieces of wire with a diode in the middle when i have done this in the past !!
is it ok if you just use 1 piece of wire?
Click to expand...

Carl,

The 'D' switches connect to ground (in fact the button circuits loop back to pin 10 of J205), so in their case it makes no difference.
 
It makes little difference for testing purposes as the main function of the diode is to prevent ghost switches being seen when others are closed. As all switches are disconnected in this test you're only closing one switch in the whole matrix so a diode is not necessary.
 
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