Blackout
Williams, 1980The ball return solenoid isn't firing on my blackout - it had burned to a crisp. I put a new one in, still no luck.
The transistor for the original board would be Q15 but there isn't one of those on the Rottendog MPU327-3. But on the Rottendog MPU327 board, Q13 tests .2 where all other transistors test .5 - I think this is an indication of a bad transistor, yes?
Is there anything else I should replace besides that one transistor?
http://www.pinrepair.com/begin/index.htm
Search for testing transistors.
And
http://www.pinwiki.com/wiki/index.php?title=Bally/Stern
Scroll to 5.7.1
Quoted from Atari_Daze:http://www.pinrepair.com/begin/index.htm
Search for testing transistors.
And
http://www.pinwiki.com/wiki/index.php?title=Bally/Stern
Scroll to 5.7.1
Thanks for that, it's great reading.
Do you think the diode could have blown on the new coil, too? I did switch the power on and try to start a game with the new coil in.
Quoted from Brijam:Thanks for that, it's great reading.
Do you think the diode could have blown on the new coil, too? I did switch the power on and try to start a game with the new coil in.
Did you connect the power wires to the banded side of the diode on the coil? If you connected the wires backwards, the diode will look like a short to the driver board and blow the fuse if you are lucky and the fuse AND driver transistor if you are not...
Wanna join the discussion? Please sign in to reply to this topic.
Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!
This page was printed from https://pinside.com/pinball/forum/topic/blackout-rottendog-mpu327-is-this-a-bad-transistor and we tried optimising it for printing. Some page elements may have been deliberately hidden.
Scan the QR code on the left to jump to the URL this document was printed from.
Houston, TX