SOLVED: Taito coin door question

obitus1990

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I have a Taito cabinet with a hacked up harness, so I bought a reproduction harness from Bob Roberts. Everything is seemingly working after wiring up a Jungle King board, with the exception of the coin switches and the service switch. I have them wired up according to the schematic below, and have tried more than one Taito door with it (each door has an intact Taito coin door harness) but neither one will coin the game up or activate the service switch. I do not have the coin counter or the lockouts wired up, nor do I have slam/tilt wired. So, I have 12V (for the lights on the door and this works fine), GND, Coin1 and Coin 2 connected. I have tried just jumping Coin1 to GND and Coin2 to GND but get nothing. What am I missing here?


1754185992670.png
 
Have you verified that the circuit board inputs are good. Take a wire with an alligator clip and connect one side to ground and touch the appropriate pad on the edge connector with the other side of your test wire. Does that trigger a coin?

COMPONENT | SOLDER
-------------------------------------------
GND | 1 | A | GND
Video Red | 2 | B | Video GND
Video Green | 3 | C | Video Blue
Video Sync | 4 | D |
Speaker (+) | 5 | E | Speaker (-)
Key | 6 | F | Key
Mster Reset (*) | 7 | H |
Coin Switch 1 | 8 | J | Coin Switch 2
Coin Counter 1 | 9 | K | Coin Counter 2
Coin Lockout 1 |10 | L | Coin Lockout 2
Service Switch |11 | M | Tilt Switch
1P Start |12 | N | 2P Start
1P Up |13 | P | 2P Up
1P Down |14 | R | 2P Down
1P Right |15 | S | 2P Right
1P Left |16 | T | 2P Left
|17 | U |
|18 | V |
|19 | W |
|20 | X |
1P Jump/Knife |21 | Y | 2P Jump/Knife
? |22 | Z | ?
 
The manual says something about clearing the CMOS if the game will not coin up, and that there is a jumper on the video board (W1) to accomplish this with. I wasn't aware of this, but it also says it's because of low battery to the CMOS, but there is not battery on this boardset.

1754188529887.png
 
Having looked all over the boardset, I can find no W1 jumper on the video or any other of the boards. On the main game board, under the rom board, there is a chip that is listed on the BOM as an MB14584. The board layout drawing has it described as a ROM. Is this the CMOS RAM?
 
Does anyone know what an MB14584 is? I cannot find a data sheet for one.

Also, I was mistaken, the service switch does work. I had a misunderstanding of its function, which is simply to add a credit and not bring up a service menu.
 
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@Cmndr Brain I tested the inputs as you described and the game will not coin up either. I went and checked my spare board set, and it won't coin up either.


Edit:

I found some info in a for sale thread here:
The seller says that the coin counter has to be wired up in order for coin up to work.
 
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This very reminiscent of the Bubble Bobble circuitry to drive coin inputs, the pic below is from the Jungle King manual

1754238169417.png
Take a look and see how that jumper is wired and switch to counter-less operation.
p
 
I went ahead and wired up the coin counter (thankfully I had the proper harness parts from Peter, since Bob Roberts' harness didn't have those spots populated on the edge connector)...and it works. So, yes, you have to connect the coin counter for the coin up function to work... except if you change (cut trace, then connect the other two points) the jumper @parism just pointed out.
 
I went ahead and wired up the coin counter (thankfully I had the proper harness parts from Peter, since Bob Roberts' harness didn't have those spots populated on the edge connector)...and it works. So, yes, you have to connect the coin counter for the coin up function to work... except if you change (cut trace, then connect the other two points) the jumper @parism just pointed out.
Good to know. Congrats on fixing the problem. One more game preserved.
 
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