Donkey Kong Forum

General Donkey Kong Discussion => General Donkey Kong Discussion => Topic started by: Bigcat76 on October 18, 2016, 02:58:03 pm

Title: Vertical scrolling issue
Post by: Bigcat76 on October 18, 2016, 02:58:03 pm
Need help, I'm new, just got this original blue cab DK, I twicked the v-cent knob just a hair.. it went haywire, started scrolling, cannot get it back for the life of me .. I should have never touched it!!
Title: Re: Vertical scrolling issue
Post by: Bigcat76 on October 18, 2016, 03:26:48 pm
I'm sure this has been asked and asked, also should be an easy fix. How it you move the v cent a hair, one way move it back where it was and nothing?? Heeeeeeelp!
Title: Re: Vertical scrolling issue
Post by: aarontruitt on October 18, 2016, 07:30:53 pm
sometimes those pots have a very small sweet spot - keep turning it back and forth VERY slowly until you get it aligned again. if turning the pot isn't doing anything at all, the pot needs to be replaced.
Title: Re: Vertical scrolling issue
Post by: YesAffinity on October 19, 2016, 08:40:51 am
Here's some good instructions on cleaning pots.  That might be a good place to start, but if that doesn't work, then as aaron said, replacement is your only option.

http://electronics.stackexchange.com/questions/2535/how-to-clean-a-potentiometer (http://electronics.stackexchange.com/questions/2535/how-to-clean-a-potentiometer)

To clarify, did you adjust the pot on the game board?  If not, exactly which one did you mess with (see the attached diagram, to identify which one it was)?  I ask because if it is on the chassis, it would probably be a good idea to discharge the monitor before trying to clean the pot.

Lastly, if you have further questions on this topic, it might be better taken to a dedicated thread, as this thread you posted in is about PCB roms and game versions.    Kappa
Title: Re: Vertical scrolling issue
Post by: Bigcat76 on October 19, 2016, 12:54:55 pm
Thanks so much for the info. It seems impossible, I won't get to it til fri, I messed with the one to the left, where I think 5 knobs are, the V-cent I believe, thanks again, it's probably dirty, it's all original. Thanks again,