Star Trek coin up

Zinfer

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Ok, I thought it was just going to be a wiring issue with a dedicated ST upright. Well, blue and yellow is not coining up. Red and White is not coining up.
I've gone all the way back to the pins on the CPU board. Which pins are supposed to coin up? P7 nothing.
I thought it was 5/6 and 7/8. But shorting them does nothing. What wires are on your coin mech?
I'm wondering if it's the 74ls chip off of 5/6/7/8 pins of the cpu. But maybe I'm trying the wrong color. there's not much off of P28.
The only thing that coins the game up is the test switch.
 
Ok, I thought it was just going to be a wiring issue with a dedicated ST upright. Well, blue and yellow is not coining up. Red and White is not coining up.
I've gone all the way back to the pins on the CPU board. Which pins are supposed to coin up? P7 nothing.
I thought it was 5/6 and 7/8. But shorting them does nothing. What wires are on your coin mech?
I'm wondering if it's the 74ls chip off of 5/6/7/8 pins of the cpu. But maybe I'm trying the wrong color. there's not much off of P28.
The only thing that coins the game up is the test switch.

The coin switches on the dedicated Star Trek upright have 3 wires connected to each switch.
Left switch from back side of coin door
white - NC P7 pin 8
red - NO P7 pin 7
green - Com P6 pin 2
Right switch from back side of coin door
blue - NC P7 pin 6
yellow - NO P7 pin 5
green - Com P6 pin 2

Try red to green or yellow to green but make sure the white and blue are not connected to green.

NC = normally closed
NO = normally open
Com = ground

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You need both the normally open and normally closed wires hooked up.

The Star Trek game reads the duration of the pulse to filter out 'false' coins.

I've seen them hooked to a button on the coin door and you have to flick it just right to get a credit.

Kerry
 
You need both the normally open and normally closed wires hooked up.

The Star Trek game reads the duration of the pulse to filter out 'false' coins.

I've seen them hooked to a button on the coin door and you have to flick it just right to get a credit.

Kerry

Yep I checked all 3 of my games and they all have all 3 wires connected to the coin switch so that's the only way to go.:)
 
I think I'm going to have to start over again with my wiring. I had the greens going to my bulbs. Going to get some cutters out and take off all the wire nuts when I can pull the cabinet outside again to work on it.
I suppose I could just try some alligator clips for right now to see if it works.
I'll post something when I have something new. Thanks for the info.
 
Very interested in this topic because I have two cpu boards now. Coin up works perfectly on one board and not at all with the second board.

Will put my 2nd board into test mode this weekend to see if anything at all registers there.

IIRC this board that doesn't register coins has the coin dip switches set to take multiple coins per credit... maybe that's it.
 
Yea I think it goes 00CC00CC00 or some such. I just messed with those switches yesterday but I didn't know enough about defaults as they aren't marked in the manual that I left the game settings alone.
And I'm thinking 0pen is on and Closed is off.
 
Well I managed to get some testing done today. The White/Red/Green does nothing. The Blue/Yellow/Green does nothing. I tried a different cherry switch as well to no avail. I then took to trying just short the White to Green and the Red to Green and White to Red and same on the other side. I'm thinking it's something on the CPU board. Probably an IC that went out with no visible signs of a problem.
 
I don't think that's a valid test, Zinfer.

The CPU board is looking for a pulse on the coin lines of a certain length -- it's going to ignore anything not of the right duration.
 
Well I did take 3 test leads with alligator clips and went from the blue, yellow and green to the coin switch contacts. I then triggered the coin switch and nothing happened. Is there a better way?
 
I don't know how you'd test manually like that. It's gonna ignore anything of a duration it doesn't like which makes testing it a real PITA.

Did you trigger it by dropping a coin through it?

Maybe just confirm the signal on the wire it's supposed to be on...
 
yes I dropped a coin through it several times. I also tried just fingering it to trip the switch wire. I may try digging for the old Star Trek coindoor switches. maybe it's something with the switch. Although I can't say what would make one switch work and another not.
I don't know which line is supposed to conduct a sense.
But I did try the white/red and green lines on both switches as well as the red, yellow and green.
Perhaps I'll try again tomorrow with the original star trek switches.
 
Man i am really stumped with this. Getting no reaction from white/red/green or yellow/blue/green at all. I've tried a couple different switches. I've dropped real coins through. Just not getting it.
 
Man i am really stumped with this. Getting no reaction from white/red/green or yellow/blue/green at all. I've tried a couple different switches. I've dropped real coins through. Just not getting it.

OK, set your switches to these, put it in diag mode where you can see coins dropping through register (I think) and try your wiring combinations:

Red switches:

1, 3, 5, 7 - down
2, 4, 6, 8 - up

Blue switches:

1, 2, 5, 6 - on
3, 4, 7, 8 - off

These are the switches for a known working board that registers coins. Realistically, the only ones that would matter are the ones related to coins per play but I'm too lazy to look it up and just give you those.
 
Wow, thanks Demogo. That GOT IT. My red switch was identical to your settings, but my blue was almost opposite. After making those changes and powering up, attaching the alligator clips, flipped the microswitch and bam!
Made the changes permanent with crimp wire nuts on wiring harness, cleaned up with wire-ties and it's coining up beautifully now.
Thank you. I'll document those switch settings on my site.
 
Glad that got it for you.

It was probably working okay before but requiring a number of coin drops to count as 1 credit.

I just tried the same trick on my board and unfortunately it didn't fix it. :(

Anyone know what chip might be responsible for this?
 
May have just found the culprit.

Put the game into diags mode and the switches on sw-2 are all reporting in diags as being all closed when some of them are not. I think this is an invalid configuration for coining up and thus my symptoms? Coin drop still isn't showing up in diags though -- you'd think it'd register the coin drop even if it took multiple coin drops to give a credit.

My other cpu board works perfectly in this same setup so the issue has to be on the cpu board.

Any thoughts regarding this?
 
May have just found the culprit.

Put the game into diags mode and the switches on sw-2 are all reporting in diags as being all closed when some of them are not. I think this is an invalid configuration for coining up and thus my symptoms? Coin drop still isn't showing up in diags though -- you'd think it'd register the coin drop even if it took multiple coin drops to give a credit.

My other cpu board works perfectly in this same setup so the issue has to be on the cpu board.

Any thoughts regarding this?

Well looking at the schematics the input wire for both coin switches connects to the same IC U6 which is a 74LS00. From there it also connects to U9 74LS253 and U39 74LS74. Their is also a resistor pack RP3 connected to the coin inputs. Looks like a 16 pin device,maybe it looks like an IC, I don't have a board handy to look at. Could be some type of pull up resistor pack for the input. Check for cold solder joints or shorts.
 
Well looking at the schematics the input wire for both coin switches connects to the same IC U6 which is a 74LS00. From there it also connects to U9 74LS253 and U39 74LS74. Their is also a resistor pack RP3 connected to the coin inputs. Looks like a 16 pin device,maybe it looks like an IC, I don't have a board handy to look at. Could be some type of pull up resistor pack for the input. Check for cold solder joints or shorts.

Because the entire bank of SW 2 are showing closed (when they're not) I'm wondering if perhaps that's the issue rather than the coin-up hw?
 
Because the entire bank of SW 2 are showing closed (when they're not) I'm wondering if perhaps that's the issue rather than the coin-up hw?

Ok it looks like SW2 all connect to IC U1 74LS253 and that connects to U35 74LS245. Do you have the schematics?
 
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