Build Your Own Arcade Controls Forum

Arcade Collecting => Miscellaneous Arcade Talk => Topic started by: big boss on August 08, 2010, 09:22:28 am

Title: Mortal Kombat 2 - Cmos chip U49 bad
Post by: big boss on August 08, 2010, 09:22:28 am

Hello Friends,

i have buy yesterday a MK2 pcb, yesterday i havent problems with it. Today i have cmos U49 bad. I cant play. See the foto and movie. What is the problem, what can i do?
Sorry for my bad english  ;D

http://www.abload.de/image.php?img=u49xxeo.jpg (http://www.abload.de/image.php?img=u49xxeo.jpg)

08082010109 (http://www.youtube.com/watch?v=e49SxAH7wR4#)

best regards
big boss

Title: Re: Mortal Kombat 2 - Cmos chip U49 bad
Post by: Kevin Mullins on August 10, 2010, 09:26:15 am

I'd start by checking the onboard battery for the CMOS. (3volt 2032 or 2025 I believe)

Or change the physical dipswitch settings for the Coinage.
(Bank 2, SW1 OFF)

http://arcarc.xmission.com/PDF_Arcade_Manuals_and_Schematics/Mortal_Kombat_2_%2816-40029-101_Oct_1993%29.pdf (http://arcarc.xmission.com/PDF_Arcade_Manuals_and_Schematics/Mortal_Kombat_2_%2816-40029-101_Oct_1993%29.pdf)

Title: Re: Mortal Kombat 2 - Cmos chip U49 bad
Post by: Malenko on August 13, 2010, 08:22:49 am

like kevin said, change it to use dip instead of CMOS, its the free-est easiest fix. After you do that, let us know if you can play.  The game over screen is a hilarious slap to the face.