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ROAD KINGS problems [Next step: Drop target]

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kastawaykid:
Something about your Transistor mod picture does not look correct to me. So I decide to go take a look at mine and an extra working supply that I have from High Speed. Looking at the picture of the configuration of the legs on your transistors, it does not look like you put the legs of the transistors back in the original holes (your board seems to have traces on the topside that mine doesn't)? Is there a reason why? I would check these against the schematic.

RayB:

--- Quote from: kastawaykid on October 20, 2010, 01:28:33 am ---Something about your Transistor mod picture does not look correct to me. So I decide to go take a look at mine and an extra working supply that I have from High Speed. Looking at the picture of the configuration of the legs on your transistors, it does not look like you put the legs of the transistors back in the original holes (your board seems to have traces on the topside that mine doesn't)? Is there a reason why? I would check these against the schematic.

--- End quote ---
Yes this transistor mod and the extra traces is what has me quite confused and suspicious, but I was following directions provided by GPE and PinRepair.com

The reason you see a difference is because that power supply is from Williams Fire! a system 11A . According to PinRepair.com 11A can be used in 11.

So to confuse matters, all reference photos from PinRepair show the transistors in holes configured in a triangle, with no other traces nearby. My board had holes in a row, and then a set of holes in a triangle below that, unused. I did not know whether to move the transistors to those through holes or keep them original. I assumed original since the instructions never said to move them, only to swap the leg positions.

AH ---steaming pile of meadow muffin---

RayB:
... I ended my above post abruptly because I finally figured it out.
PinRepair says this:
"A replacement MJE15031 in an older system 11 power supply: The leads on the MJE15030 and MJE15031 must be "twisted" to replace the older SDS201 and SDS202 transistors. This should ONLY be done on power supplies that originally used the older SDS201 and SDS202 transistors. It's a good idea to use heat shrink tubing on the crossed leg to prevent a short.

They say "older" without specifying which board revision. Since an 11A can be used in an 11, I figured 11 and 11A are "older system 11". AND to further mislead me, this is Great Plains Electronics instruction sheet:

http://www.greatplainselectronics.com/Downloads/W3-11_HV_Kit.pdf

Note the bold that says "This note does not apply to later System 11b and 11c boards."   So why wouldn't I think I had to cross the legs in an 11A board?????!?!?!?  :angry:

PR says "This should ONLY be done on power supplies that originally used the older SDS201 and SDS202 transistors."
 So I checked the parts in the Fire! manual and indeed, 11A didn't use SDS transistors. It used MJE. Great Plains + maybe my noobishness is to blame here.


@Pinball Wizard: Ill post a video soon so you can hear the music first hand

kastawaykid:
Ah, that makes sense now at your Power Supply is an 11A. All I have is original System 11 boards and the trace work and holes did not seem correct. Hopefully if you configure the leads properly, the supply will work (if none of the components failed or got stressed because of it). Hope you solved your problem.

Kid

RayB:
Uncrossed the legs. Still blowing F1.

So Jim, where do I find power supplies on Ebay cheap like you said? I only see one for the exact same price as a RottenDog.

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