(Topic ID: 287310)

DATA EAST PPB Board Coil lock on

By McPin54

3 years ago


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  • 17 posts
  • 8 Pinsiders participating
  • Latest reply 2 years ago by Scucci_
  • Topic is favorited by 1 Pinsider

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#14 2 years ago
Quoted from chad:

On the CPU Board.
The main drive transistor is Q41 Tip 102, Q33 is the predriver 2n4401. I would replace those two items along with the Diode 1N4007 on that coil.

Left back drops are Q41 as chad mentioned. Q40 is on the right bank drops.

So why had you replaced Q40?

4 weeks later
#16 2 years ago

Does R74 to R76 measure close to the same resistance?

You made sure you did not have a solder bridge between any of the transistor legs after soldering?

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