mortal kombat pcb

[xrodney]

hi, i was reading the manual and it says that that the cabinet must have -5v.  some says that -5v can damage an mk1 pcb.  which one is true?

i have a 2 in 1 jamma switcher and the picture when 1 switch to the second connector is not good. when there is the ro check the picture seems smudged and there are like shadows in the game, can it be from the pcb?

[MonMotha]

Almost all Midway boards require the -5V line hooked up.  They use it over in the audio processing area.  MK1 should be like this (I believe it uses the same sound board as NBA Jam which definitely uses the -5V line).  No game complying with the JAMMA spec should be damaged if -5V is hooked up in the proper location, though many don't use it.