Vintage Synth Repair

Hi Scott.

Yes, it seems more discreet.

There are no large 3 terminal regulators, however there is a D1406 Transistor , a thyristor 5P05M and 2 ic's ( IC1:Nec C3423C / IC2:Mitsubishi M5218L ).
IC2 seems like it is for the 10v Ref but all the others belong to the 5v circuit , the +/- 15v is looking solid.

Just found and ordered the D1406 and the M5218L , have not been able to find the NecC3423C.
I replaced the thyristor 5P05M (was missing) with a BT151.

I do have a scope but I am not sure how to measure DC ripple , I have read up on that but could not get it to work?

I will check for loose solder joints and replace the caps.

Thanks
Arnar







----- Upprunaleg skilaboð -----
Frá: "Scott Frye" <painintheamp@...>
Til: vintagesynthrepair@yahoogroups.com
Sent: Þriðjudagur, 24. Desember, 2013 13:49:32
Efni: [vintagesynthrepair] Re: Jupiter 6 PSU.







Yes, I would say it's the PSU. I dont have a diagram for it here but , in a rig with THAT much digital, the +5volts is either a LARGE three terminal regulator ( in a T0-3 case) , or something more discreet. Also, weak solder joints are a problem when a circuit asks for current. So, replace all electrolytic caps in the +5 supply, resolder any connections that appear "grayish" or weak and find the PSU diagram


--
Scott Frye

Audio-fixation.net

Vermont