Dragon's Lair Fans - Arcade Lifestyle

General Chat => Technical Area => Topic started by: Muerto on August 31, 2009, 01:32:08 PM

Title: Gauntlet sense +/-
Post by: Muerto on August 31, 2009, 01:32:08 PM

(http://muerto.superfreehost.org/gs.png)

Is it a special power supply for gauntlet use only?
Or can i use a regular one?? (GND, -5, +5, +12 aso) in case of yes, where do i put sense+/-? - on the FG and NC on my power supply?

Title: Re: Gauntlet sense +/-
Post by: level42 on August 31, 2009, 05:18:03 PM

Atari used the sense on many (if not all) of their machines in the early 80's.

The sense is a feedback 5V from the PCB. With that, the power supply checks if it's still putting out enough Volts. If not, it will increase it a bit. Remember those were lineair power supplies that still used.
Sometimes, when contacts are very bad, the sense would indicate a very low voltage and thus the PSU upped the 5V too much causing burning parts. However, this is always a situation of a bad edge connector to the PCB edge.

Is there a reason not to use the original power supply ? If you're going to use something else I think you can just leave the sense disconnected.

Title: Re: Gauntlet sense +/-
Post by: level42 on August 31, 2009, 05:24:20 PM

WOOOPS, foget my reply, just glanced over the schematics and it looks like Gauntlet does use a switching PSU.

SOrry !

Check out the schematics here for info on the PSY, Atari had pretty good manuals:

http://arcarc.xmission.com/PDF_Arcade_Atari_Kee/Gauntlet/

Title: Re: Gauntlet sense +/-
Post by: Muerto on August 31, 2009, 06:45:55 PM

ok, thanks!
I give it a go later today!

Title: Re: Gauntlet sense +/-
Post by: Muerto on August 31, 2009, 08:24:37 PM

well... now the PCB is wired up, but the monitor is of course dead.... AAAAAAAAAAAAAAAAAAAAARH!!!!!!
can a cap kit fix that? (hantarex DE 04)