Dragon's Lair Fans - Arcade Lifestyle

General Chat => Technical Area => Topic started by: Belike on January 06, 2014, 12:50:03 PM

Title: Midway Galaxian pcb sound area
Post by: Belike on January 06, 2014, 12:50:03 PM

I'm in the middle of a Single rom hack of a Midway Galaxian pcb, unfortunately my pcb's sound area was modified earlier and I guess some components are bad or missing.Is there anybody who can make some hi res pics from the original setup or tell me what is missing?
Here is some pics from mine:
(https://lh4.googleusercontent.com/-32jgO4caefQ/Usp1vV2ye4I/AAAAAAAAIOY/AYseiX1uGA4/w801-h532-no/010.JPG)

(https://lh3.googleusercontent.com/-fJPjhCL_g5M/Usp1whlg6dI/AAAAAAAAIOg/PPXhOOYd9Ww/w801-h532-no/011.JPG)

(https://lh3.googleusercontent.com/-_9l3oZBgdmY/Usp1x-S74jI/AAAAAAAAIOo/DSULaHPDKYI/w801-h532-no/012.JPG)

(https://lh3.googleusercontent.com/-Bs_82HpIJy8/Usp1zAOikCI/AAAAAAAAIOw/JAaqDNBS0cA/w801-h532-no/013.JPG)
You can see something from the removed hack on the botttom left corner:
(https://lh5.googleusercontent.com/_-UA8BV99Des/TYokU6vjm6I/AAAAAAAACoc/jm1UDNcVWt0/s800/Galaxian%20pcbs%20007.jpg)

Title: Re: Midway Galaxian pcb sound area
Post by: Laszo on January 06, 2014, 04:03:01 PM

Hope it helps

Title: Re: Midway Galaxian pcb sound area
Post by: Belike on January 06, 2014, 06:30:19 PM

Thanks Leo, I really appreciate it. ;)
On your last pic, there is a green something under that heatsink.
On my pcb there is only one of these marked 472K100V at position C50 and nothing in C49 next to it.
Are there the same thing on yours in C49?

Title: Re: Midway Galaxian pcb sound area
Post by: Laszo on January 06, 2014, 06:32:49 PM

No both are filled.... A really small cap..... Hard to see... You probably want to know what number is has?

Title: Re: Midway Galaxian pcb sound area
Post by: Laszo on January 06, 2014, 06:42:47 PM

i did it  ;D

It is marked:

 .47/35
+++++

Title: Re: Midway Galaxian pcb sound area
Post by: Laszo on January 06, 2014, 06:48:41 PM

472K100V at c50 is correct.

Title: Re: Midway Galaxian pcb sound area
Post by: Belike on January 06, 2014, 06:57:55 PM

Many Thanks again, I guess that will be the problem. ;)