Dragon's Lair Fans - Arcade Lifestyle

General Chat => Technical Area => Topic started by: vernimark on September 09, 2014, 12:13:23 PM

Title: Bizarre Deflection Yoke
Post by: vernimark on September 09, 2014, 12:13:23 PM
I decided to remove the color hack to my SPRINT ONE cab. In my spare parts I had a SELTI B/W monitor. I recapped it and powered on it I could see a very strange image shape (attached). I used as signal test my ASTRO WARS cabinet that was close to my desk...
Once I replaced the YOKE I had a good result (second picture)

My question is: what can cause that kind of distortion? It seems to involve both H and V coils but actually I dunno.
I'm asking that because I want to be sure the yoke is definitely damaged before to consider it rubbish
Title: Re: Bizarre Deflection Yoke
Post by: Etienne MacGyver on September 09, 2014, 01:41:58 PM
I have no clue, but it does look Funky !
Title: Re: Bizarre Deflection Yoke
Post by: Wurstkopp on September 09, 2014, 01:50:52 PM
Looks like the yoke is fucked. Same thing that happens to pinball coils - if the copper wires inside are messed up, the beam will not be deflected correct anymore. :(
Title: Re: Bizarre Deflection Yoke
Post by: vernimark on September 09, 2014, 03:57:05 PM
Quote from: Etienne MacGyver on September 09, 2014, 01:41:58 PM
I have no clue, but it does look Funky !

hehe I can save that yoke for special effects

Title: Re: Bizarre Deflection Yoke
Post by: Byte Surfer on September 13, 2014, 06:32:24 PM
Quote from: vernimark on September 09, 2014, 03:57:05 PM
Quote from: Etienne MacGyver on September 09, 2014, 01:41:58 PM
I have no clue, but it does look Funky !

hehe I can save that yoke for special effects



so you definitely replaced the previous 'flashing' color monitor :D, how many times it killed your PCB?

bests
BS
Title: Re: Bizarre Deflection Yoke
Post by: vernimark on September 19, 2014, 12:19:24 AM
The flashing monitor is inside astro wars. I swapped some cards randomly woth a spare mtc 90 and now seems.to work fine  :oops:
Not exactly a scientific process...
Title: Re: Bizarre Deflection Yoke
Post by: Laszo on September 21, 2014, 09:48:45 AM
To bad, i liked the poltergeist look... Whole new dimension of gaming in the Twilight Zone  8)