UPDATE: Roasblasters power supply problem
- From: "Dave Nelson" <davenelson@xxxxxxxxxxx>
- Date: Fri, 04 Nov 2005 06:22:15 GMT
Got it figured out. It was the 35A rectifier bridge on the power supply block. Replaced that and she works great!
Dave
"Dave Nelson" <davenelson@xxxxxxxxxxx> wrote in message news:8QB8f.692$8T1.456@xxxxxxxxxxx
A little update...
I've replaced all caps on the Regulator/Audio III board and the fried R20 resistor. An ebay'er was kind enough to give me the value of the R20 on his board he had for sale. It's a 2.7 ohm, 1 watt if anyone's interested.
Anyway, with the new caps and replaced resistor, I get .9 v at the 5V test point on the regulator board, and the same reading on the 5v test points of the System 1 CPU and cartridge boards. So the System 1 CPU board still isn't firing up. At the 22v test point on the regulator board, I get 23.4 v, so that appears ok.
Any ideas where I should try now? Also one bit of weirdness... the manuals I have with the game give the Regulator/Audio II board as coming with Roadblasters, NOT III. I acquired the game as not working, so I don't really know if it ever worked with the III board it has in it. Now I'm thinking of looking at the big cap on the power block, or maybe the line filter or the power block's rectifier. Anyone know how to test these?
Finally found info on the power supply in a Paperboy manual, viewable here, pages 53-54 and 81-83
http://basementarcade.com/arcade/library/manuals/p/paperboy.pdf
Any more help is appreciated.
Thanks! Dave
The glass fuses all look good in the power block.
"William" <someone@xxxxxxxxxxxxx> wrote in message news:ZRN6f.14738$OM.1139883@xxxxxxxxxxxxxxxxxxxxxxxxxxxHi Dave,
Welcome to the group. I used to have one of these Roadblasters. Check the voltages coming from the power supply first to see if you are getting too much or too little. As I recall there was a power block and a switching supply. The switching supply powers the boards. I think I might still have the manual and schematics somewhere. I'll try and find them and post back with morre accurate info.
BTW where are you located? I'm in Columbia, South Carolina...if thats near you maybe I can help.
Later, William
"Dave Nelson" <davenelson@xxxxxxxxxxx> wrote in message news:xOz6f.4970$gF4.1086@xxxxxxxxxxxCorrection, it's a 12-pin connector. Dave
"DAVID NELSON" <davenelson@xxxxxxxxxxx> wrote in message news:Xou6f.678$Yn4.340@xxxxxxxxxxxHello, I'm trying to chase down a problem with my Roadblasters. The board is dead, so no play, but when plugging in the 9-pin square connector from the power supply to the System 1 board, it'll work for about a half of a second then go dead again. Tried wiggling the connector around, doesn't help, So I'm thinking there's too much power or not enough,making the board shut down??? As you can tell, I'm new to this, I ususally work on tube radios, so this is all greek to me. Anyway, on the power supply board (Atari Regulator/Audio III, #043046) resistor R20 is burnt to a crisp so that you can't tell what the color bands are. I'd love to find a shchematic of this board or just some help with the value of that resistor and any help on the cause of its demise would be great too. I'll be replacing the caps on the board too, but the resistor value is obviously needed.
Thanks!
Dave Nelson
davenelson@xxxxxxxxxxx
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