John's Arcade Forum - Classic Arcade and Pinball Collecting and Restoring Discussion Forum - RETRO MAME - Nintendo Vs Forum
April 25, 2024, 12:49:51 pm *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Welcome to the John's Arcade Forum. Glad you made it! Smiley
 
  Home Help Search Calendar Login Register  
  Show Posts
Pages: [1]
1  Tech and Marketplace / For Sale / Wanted / WTB Nintendo Red Tent Legs on: March 09, 2018, 07:32:59 pm
Just picked up a project red tent, but it needs some legs as someone made there own. (poorly I might add) So I if anyone has a set let me know. Thanks
2  Tech and Marketplace / I need help with my game! - Technical Discussion / Monitor question. on: January 05, 2018, 08:08:15 pm
So I have acquired and fixed an atari Kangaroo
And the monitor has a decent picture, but when I power it of it leaves a rainbow colored spot for a couple minutes on the screen. Should I worry about it or is my tube about to go?
3  Arcade and Pinball Discussions / General Arcade and Video Game Discussions / Re: on: July 23, 2016, 01:56:33 am
Well most chassis fit so long as the neck board socket is the same and you swap yokes I have had good luck with Orian  TVS from the 90s to fix go7s and such, but yeah any chassis will fit   with a yoke swap so long as it's the right kind of tube (vector, mid res, B&W, ect) realignment of the joke is a pain but the results are worth it. I have even used tubes that used to have a bonded yoke if you are cleaver about removing it. If anyone sees I put misinformation feel free to correct me but I hope this helps

Sent from my SCH-I545 using Tapatalk
4  Tech and Marketplace / I need help with my game! - Technical Discussion / Re: Rockola Eyes help on: July 17, 2016, 04:58:01 pm
Update to this. After a lot of reading and watching many videos on using a logic probe.

Got the hardware to check all the roms and 7D was bad.  I reprogrammed the chip and they all checked good, but no difference.  All the sockets have good connections so I checked the clock at pin 6 of the CPU and it seemed ok, logic probe showed the low and high lit up and pulsing, so i went on and checked the ram and noticed that none of them were ever being written to( WE pin stuck high). 

     So i followed all the ram write enable logic back to the CPU and it all seemed ok.  So something told me i should check the whole clock circuit where i think i am finally unto something.  All my research showed this PCB being very close to pacman so I stumbled across this.

http://lawnmowerman.rotheblog.com/logicprobe.html

So I follow the clock troubleshooting and on pin 13 of the 74ls368 i notice I have a high pulsing signal instead of a high and low pulsing signal. So now i think I am unto something I'm just trying to figure out which part is bad, but I am hopping when I figure that out the game will at least try to boot. I will be updating with more progress, hopefully soon.
5  Tech and Marketplace / I need help with my game! - Technical Discussion / Rockola Eyes help on: June 18, 2016, 03:59:05 pm
Hello,
        Today i am finally getting around to the Eyes project. I have made a test bench with a good monitor i found and tested the power supply.  All thing checked good so it hooked up the pcb to test and adjust voltages on the board.  the 5V and the 12V both test good. So I hooked the game up to the monitor and have a garbage screen.  I then cleaned the legs on all the socketed chips and still the same issue.
         Putting the game into test makes no difference except for one time i got a row of Fs in the middle of the screen as shown below.



This is how the screen looks normally



So i am guessing ram or rom issue? Im guessing ram, but have no clue how to find out which one is bad short of putting sockets in for all of them and swapping in new ones. 
     Any help would be appriciated thanks!
6  Tech and Marketplace / I need help with my game! - Technical Discussion / Re: Galaxian color issues on: June 18, 2016, 02:57:00 pm
*Update*
Game is playing perfectly now after learning the hard way that purity needs to be adjusted with the monitor facing magnetically north/south.  So after readjusting it Galaxian now works perfectly.  Now to fix Eyes which is proving to be more difficult to get working as there is little troubleshooting info.
7  Tech and Marketplace / For Sale / Wanted / Re: Atari centipede tested working PCB on: May 13, 2016, 07:39:16 pm
This still available?


Sent from my iPhone using Tapatalk
8  Tech and Marketplace / I need help with my game! - Technical Discussion / Re: Dead Ms. Pacman on: March 09, 2016, 12:35:26 am
Already done thanks for the advice.
 My Galaxian will be getting new fuse blocks as well to fix at least one of its problems.


Sent from my iPhone using Tapatalk
9  Tech and Marketplace / I need help with my game! - Technical Discussion / Galaxian color issues on: March 07, 2016, 09:55:40 pm
So after getting Ms. Pacman working i decided to take a crack at Galaxian.

I started by rebuilding the power supply as some parts were clearly missing.

I then got a high-score save / Rom board replacement from arcade.souzaonline.com as i had several Rom errors before and thought id get the
upgrade for troubleshooting and high scores.

Long story short the game now works (in Ms. Pacman) as my Galaxian monitor is waiting on some purity adjustments.
The problem i am having is the Blue rows of ships are gray while all the other colors seem ok.
I'm thinking the Blue drive may be down or its an issue with some of the other rom chips

My question is should i expect color ROM issues or monitor issues.

Now for the Galaxian monitor (not different from the one above) its a GO7- CAO that i rebuilt and did a tube swap in as the original tube had
a broken neck.  My question with that is if anyone has any advice for generating a red field to help adjust the purity.  

I think that is all thanks!

*Update the color issue is not the monitor just checked the color drives*
on all the ships the blue wings are still dark blue, but the light blue ships are defiantly gray so fixing the gray ships is my concern*
10  Tech and Marketplace / I need help with my game! - Technical Discussion / Re: Dead Ms. Pacman on: March 07, 2016, 09:38:55 pm
So finally getting back to this i checked the fuses and the bottom of the cab and they tested ok.

I then reseated all the fuses and the game worked so new fuse blocks and the game is now 100% working.

Thanks for the help!
11  Tech and Marketplace / I need help with my game! - Technical Discussion / Dead Ms. Pacman on: February 04, 2016, 11:17:37 pm
So i posted on here a couple of moths ago that i got a Ms. Pacman.

I managed to get it working with a total rebuild for the GO7 monitor and a new edge connector as well as cleaning the roms.

Today i was dialing the monitor in, but was having an issue keeping the game in test as there was no switch and the wires
were cut off.  So i decided to wire the game into test using the wires that where there.  The game would go into test but would not stay on the grid screen
for adjusting the monitor.  After i tried resetting the game a few times it went dead on me. Cry  The five volts now reads one volt so my guess is i simply blew a cap
on the pcb.  My question is what are the chances i hurt the Z80 or the roms, and does anyone have a Ms pac coin door harness and or test they would want to part with
and has anyone had a similar problem in the past.
12  General Category / Introduce Yourself / Central Kansas on: October 22, 2015, 11:45:45 am
Hello all. 
I am a college student who is studying the restoration of classic cars, and have been wanting to get in to arcade restoration as well.

I just recently picked up a Ms. Pacman, Galaxian, and an Eyes.  I will be on the hunt for tubes for both the Galaxian and Ms. Pac as both tubes are shot.
 
 I also need to find a board for the Galaxian.  I will be on the lookout for parts for sale or trade for the Eyes if anyone is interested.

-This is my first post and I am excited to be part of the community-
Pages: [1]
Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Install Simple Machines Forum Valid XHTML 1.0! Valid CSS!