Early 90's Data east MPU help

[Banzaipinabll]

Data east early 90's MPU board, the circled resistors are getting very hot, you can see some heat damage to the board.

Having done some research it seems this maybe normal, does anyone here have the same situation, mine is very hot, to hot to touch

Have also read that you can maybe swap out the TIP42 for something else and remove the resistors, does anyone have experience of doing this

thanks

 

[Calimori]

I have a DE machine looking very similar and I am sure someone said this was usual. Burnt dust and stuff from years of heat.

 

[Banzaipinabll]

It just seems so hot, very strange design. Maybe will give the mod a go to reduce the heat

 

[AlanJ]

it’s normal. the clue is the size and make of those resistors. they’re designed to get hot.

 

[Asiapinball]

Specification was changed around 1995 this board was out of a batman forever but all early boards with big white resistors are usually toasty. I recall reading of modifications to earlier boards to stop this issue. Maybe on pinside?

 

[Asiapinball]

The below was on Pinside, I couldn't find what I recalled reading, but expect similar. Never done it myself, my boards already came as toasty as yours and never relished prospect of working on toasty boards. Own risk! Maybe somebody has actual experience of this on group?

DumbAss test and reproduction PCBs | Tech: Generic | Pinside.com

| Forum Topic by DumbAss

pinside.com

 

[Banzaipinabll]

The below was on Pinside, I couldn't find what I recalled reading, but expect similar. Never done it myself, my boards already came as toasty as yours and never relished prospect of working on toasty boards. Own risk! Maybe somebody has actual experience of this on group?

DumbAss test and reproduction PCBs | Tech: Generic | Pinside.com

| Forum Topic by DumbAss

pinside.com

View attachment 184673

View attachment 184674

Thanks, read all the text on Inside, wondering if anyone has done this mod or if it's even worth the hassle, some off the traces on some of the TIP42's don't look great, so I imagine the mod could be a pain, might just leave it.

 

[Arv]

If it's not broke and all that..

 

[Jagspete]

It’s a normal effect, has been suggested to fit new ones but leave the legs longer to give more space between them and the board for increased cooling/ air flow

 

[Banzaipinabll]

Well today when I turned it on, they all went hot, one resistor got so hot it's desoldered itself and started to smoke, what would cause that?