Recapping an Atari ARII board from a Dig Dug...

enjoyvelvet

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Ok so I've never replaced the "hot"...the metal round thing. So I just remove some of the solder around the screws on the bottom...replace...and put some solder back on around the bottom of the screws to ensure a good connection? I assume polarity doesn't matter on this one right? Justttttttttttt want to double check. Anything else I need to know? I'm sharpening my skills so one day befre the year is out I cap a damn monitor and be a real arcade man :)
 
Yer referring to the 5v regulator transistor. It only goes in 1 way. BUT, make sure you have an insulating spacer under it. There was one under the one you removed and it was either grey and rubbery or stiff and clear with white paste on it. This *needs* to be there. Its best to use a new one with fresh heatsink goo when the transistor is replaced.
 
Yer referring to the 5v regulator transistor. It only goes in 1 way. BUT, make sure you have an insulating spacer under it. There was one under the one you removed and it was either grey and rubbery or stiff and clear with white paste on it. This *needs* to be there. Its best to use a new one with fresh heatsink goo when the transistor is replaced.

Ahh jeez...where do I find one? Maybe I'll just leave that one alone and do the caps...

OZ...thanks for the "duh" advice...I should have known that one...I wasn't paying attention! :)
 
Ahh jeez...where do I find one? Maybe I'll just leave that one alone and do the caps...

OZ...thanks for the "duh" advice...I should have known that one...I wasn't paying attention! :)

A HOT is a horizontal output transistor. This is also a transistor, but not a HOT.

You should do it. Leave the bolts alone, but undo the two nuts up top first, then remove all the solder from the underside and remove the component. The insulator is between the transistor and the heatsink, and you can't have lost it unless you removed the transistor.

It can take a bit of heat to get these out, so be careful not to ruin the pads.
 
Ok so I've never replaced the "hot"...the metal round thing :)

That's pretty funny. They do both have the TO-3 casing so I can see how you would get them mixed up.

Yea, as the other poster said HOT are for CRT monitor deflection. They are technically a transistor, but they are made to operate at a higher voltage and frequency.

The 2N3055 in your ARII heatsink, is just a big heavy duty standard transistor that can handle higher currents. It handles the +5 Volt since it's the most used voltage.
 
yea, four years in and I still don't know it all :) I just figured since it looked like the "hot" on the monitor chassis then it was called the same thing!

I'll gonna get to work on it this weekend. I can do the cosmetic stuff but its time I start getting down to the nitty gritty and actually learn about electronics repair. Thanks for all the advice guys!
 
Cap kit went great tonight and even fixed my machine! (I was hoping it wasn't the pcb causing it to not boot properly).

Now I just need to grab a rebuilt G07 chassis from Riptor and she'll be good to go. Thanks all!
 
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