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Archived from groups: rec.games.pinball (More info?)
The display. 4th run LOTR. Feb 05 date code.
While playing a game, (and during the third ball), I looked up and no
display!
So pulling the back glass I noticed a little smoke streamer rising from
the display power supply, (upper left corner).
Naturally I kill the power immeadiately. Q3 and it's heat sink are
pretty hot. Amazingly, upon bench testing I find no failed components,
not even the fuse is bad. So I replace Q3, MJE15030 and Q2, MPS A92.
Power up the supply without the display connected and open voltages are
good. -109 on the -120 and -96 on the -100. Good enough.
Power down and reconnect the display briefly. Dead. LED on controller
is on. Power back down and remove the display from the framework,
(what a bitch!). I temporarily strap in another display and everything
is OK.
I mount the spare display onto the framework, put the weatherstripping
around the glass, and put it back on the game. I somehow have done
something a little wrong in the assembly as some light is seeping onto
the glass from the backbox lamp. (Fix that later but thought I would
mention it).
I am at a loss to explain the high current draw that apparently took
place across Q3 without taking out the fuse. It has the proper fuse
value, (from factory).
So here is a heads up post for your notebooks! The fuse may not
protect the components and there will be heat!
Mario
Pinthetic
The display. 4th run LOTR. Feb 05 date code.
While playing a game, (and during the third ball), I looked up and no
display!
So pulling the back glass I noticed a little smoke streamer rising from
the display power supply, (upper left corner).
Naturally I kill the power immeadiately. Q3 and it's heat sink are
pretty hot. Amazingly, upon bench testing I find no failed components,
not even the fuse is bad. So I replace Q3, MJE15030 and Q2, MPS A92.
Power up the supply without the display connected and open voltages are
good. -109 on the -120 and -96 on the -100. Good enough.
Power down and reconnect the display briefly. Dead. LED on controller
is on. Power back down and remove the display from the framework,
(what a bitch!). I temporarily strap in another display and everything
is OK.
I mount the spare display onto the framework, put the weatherstripping
around the glass, and put it back on the game. I somehow have done
something a little wrong in the assembly as some light is seeping onto
the glass from the backbox lamp. (Fix that later but thought I would
mention it).
I am at a loss to explain the high current draw that apparently took
place across Q3 without taking out the fuse. It has the proper fuse
value, (from factory).
So here is a heads up post for your notebooks! The fuse may not
protect the components and there will be heat!
Mario
Pinthetic