Gunfight Repair question,

[Bwavefront]

I'm working on a Gunfight board and it would not coin up or start and after some testing I'm not getting any power out of either 8 pin SIP resistor array between E-F, 1-2 or G-H 1-2 so I'm assuming both at bad. I was planning on replacing the Opto's with MCT6's but I can't figure out the correct SIP's. The one's in it are Dale 7612 CSP 08E 01-56IJ which I can't find a cross reference for and the diagram at https://www.arcade-museum.com/manuals-videogames/G/gunfight_2.pdf scan is pretty bad and I can't read it. I think they should be 750 Ohm or about ½ watt at least that what Seawolf uses and it looks like there are plenty of 8 pin SIP's out there. I did jumper past the Opto's and the board starts, coins and shoots so I know the issue is somewhere in the opto's or power to them.

Any help or advice is appreciated,
Thanks,
Steve

 

[electrotim]

That is a 560 ohm 5% resistor network
7 resistors - Bussed
8 pin sip package
1 watt for the package
So about 145 mW per resistor.

 

[blinddog]

The schematic I have says 560 ohm but I've seen different values. For example the board in front of me now has 2 1k arrays soldered in so they are in parallel and equal to 500 ohm.

Are you getting VLED to pin 1 of the resister array? I think it's about 15v it comes in at pin 11 or 12 on the mainboard connector

 

[electrotim]

If 2 resistors of 1K value in parallel then it is 500 ohms. Not 500K ohms

 

[blinddog]

If 2 resistors of 1K value in parallel then it is 500 ohms. Not 500K ohms

you are right, I meant 500. Edited the previous post. Thanks

 

[Bwavefront]

Blinddog, you once again saved me from my own stupidity. I built this test rig specifically for SeaWolf boards and have used it on a few other 8080 boards. The rig has no pin 11 or 12, VLED or no power to the opto array so I may have no problem at all. Its seems a bit odd that this array has its own separate power source so is this because all those opto's need more power? I do have 12V off of this switcher which I could push to those pins but would that be enough to power that circuit? Anyways, I buried the cab in my garage so I'll pull it out and test it. Thanks for posting the diagrams, at least I can read them now.

I talked to you awhile back about fixing a Tank II boardset, If you have time these days to work on it let me know. You fixed my Stunt Cycle last year and it works great.
Thanks, Steve

 

[blinddog]

12v will work to power the vled that's what I use on my harness. I should be able to take on tank. Send me a pm and we can talk about it.

Matt

Blinddog, you once again saved me from my own stupidity. I built this test rig specifically for SeaWolf boards and have used it on a few other 8080 boards. The rig has no pin 11 or 12, VLED or no power to the opto array so I may have no problem at all. Its seems a bit odd that this array has its own separate power source so is this because all those opto's need more power? I do have 12V off of this switcher which I could push to those pins but would that be enough to power that circuit? Anyways, I buried the cab in my garage so I'll pull it out and test it. Thanks for posting the diagrams, at least I can read them now.

I talked to you awhile back about fixing a Tank II boardset, If you have time these days to work on it let me know. You fixed my Stunt Cycle last year and it works great.
Thanks, Steve