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Main => Main Forum => Topic started by: redfivexw on June 29, 2011, 02:08:35 pm

Title: having a hard time with a mortal kombat
Post by: redfivexw on June 29, 2011, 02:08:35 pm

Ok,
i have a mortal kombat machine that a friend asked me to work on.  Here is the problem.  The machine had a bad power supply, i replaced it with a switching unit.  I cannot get any sound out of it.  I know the boards are good because i checked them with my own Mortal Kombat setup.  Is there something i should be looking for, because i really cannot figure it out!

Title: Re: having a hard time with a mortal kombat
Post by: HaRuMaN on June 29, 2011, 02:10:22 pm

Try turning the volume pot?  I know my volume pot in my MK is a little flakey...

Title: Re: having a hard time with a mortal kombat
Post by: HaRuMaN on June 29, 2011, 02:10:47 pm

You should see it when you open the coin door...

Title: Re: having a hard time with a mortal kombat
Post by: Malenko on June 29, 2011, 02:16:36 pm

did you already try a different jamma board in the cab for sound?

Title: Re: having a hard time with a mortal kombat
Post by: postmortem on June 29, 2011, 03:00:59 pm

bad speakers?

Title: Re: having a hard time with a mortal kombat
Post by: Scott84 on June 29, 2011, 03:04:57 pm

Other jamma boards work with sound?

Title: Re: having a hard time with a mortal kombat
Post by: redfivexw on July 04, 2011, 09:44:26 am

i tried all those things, i cannot seem to track down the issue, i am going to spend some time today on it.  It has me baffled.

Title: Re: having a hard time with a mortal kombat
Post by: DaveMMR on July 04, 2011, 09:54:11 am

Is Mortal Kombat one of those games where you have to go into service mode to adjust the default volume?  I know I had to do that with MKII and MK3 (the Mame versions, that is). 

Title: Re: having a hard time with a mortal kombat
Post by: Vigo on July 04, 2011, 01:53:02 pm

Could be a short in one of the wires. I would also try taking a multimeter to each end of every speaker/volume wires to make sure you are getting a connection.

Title: Re: having a hard time with a mortal kombat
Post by: Q*Bert_OP on July 04, 2011, 04:07:34 pm

Check the ribbon cable between the sound PCB and MPU. Make sure its on correctly(red stripe to pin 1 on both sides). Try squeezing the connectors with pliers. I have an NBA Jam out that has a flaky ribbon cable.

All cables that go between sound pcb and MPU present?

-5v present?