Matsushita B+

scottsmith

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Donor 2012
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Jan 25, 2011
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Hey folks -

Got bad vert on my new Millipede. Matsushita. PO says cap kit installed and the caps do look "new".

When I first looked at the game yesterday, it worked fine. Slow wave developed while we were there and we negotiated price. Now game boots into bad screen.

Game is all original except for PCB. Original power brick which I suspect is suspect.

B+ adjust was still factory locked down, but measured B+ was 150.4 and would not change regardless of how far I adjusted the pot.

Thoughts? This is my first Matsushita...I know, I know...

Thx -

Scott
 
UPDATE...but still problems

OK...rebuilt the AR/II and power supply with Bob Roberts kits today. Game board is getting correct voltage now and does not read in German any more (even with the DIPs correct!). After a few seconds on, vertical roll sets in....first as a wave that pulls the right side of the screen up and the left side down...then it starts a rollin'

I am getting these numbers...

Monitor chassis ACV output from PS - 129.1
Marquee ACV output from PS - 121.0

B+ on monitor chassis - 146.5 VDC

B+ pot does not seem to make a difference in the B+ value. It was factory glued.

Any ideas?

Thanks -

-Scott
 
UPDATE again!

I found an open resistor (R811) in the B+ circuit and replaced. Also went ahead and replaced both Vert Output transistors while I was in there. BINGO - 123.0v perfect!

But....now I have no sync - any ideas? I noticed my Volcano LED's have also stopped working.

Thoughts?

-scott
 
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