MKS 80 VCA problem or what

The Roland Super-Jupiter (MKS-80) analogue synthesizer
roginator
Posts: 13
Joined: Sat Sep 29, 2007 8:45 pm

MKS 80 VCA problem or what

Postby roginator » Fri Jul 17, 2009 12:03 am

on all voices level is so low and after few minutes it rise up up to distortion... and it burned one VCA and Opamp in second VCA on lower board....

i have few spare vca and opams but dont want to kill em no more

That happend on non recaped version..I thought problem is on recaping....anyway I wanted to recape whole machine....BUT after recaping I have samme issue..but now i swich of MKS 80 on time for VCA dont die when it start to be too loud with distortion

any idea
.....

roginator
Posts: 13
Joined: Sat Sep 29, 2007 8:45 pm

Postby roginator » Fri Jul 17, 2009 12:40 am

problem solved.. cold solder ...but still ....it gets regular volume after 2 minutes
is that normal ..or

roginator
Posts: 13
Joined: Sat Sep 29, 2007 8:45 pm

Postby roginator » Fri Jul 17, 2009 3:13 pm

ok i took some time and checked voice boards

Problem is not there

ON TP5 * test point 5

i have good signal even when on switching its 30db lower on output on TP5 everything is ok!!!..tested it with Scope!!!

so output PBC is problem

roginator
Posts: 13
Joined: Sat Sep 29, 2007 8:45 pm

Postby roginator » Mon Jul 20, 2009 4:59 pm

problem was Dead capacitor on Analog out PCB... solved

BABY WORKS LIKE NEW!!!


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