they are a thin square strip for the back of the
power regulator
and a small thermal plastic washer with an internal
raising that sits inside the hole of the power reg
theres a hole in this for a 3mm screw the hole in
the reg is 4mm
so the rased 4mm insert on the 5mm washer fits the
4mm regulator hole the 3mm screw fits throught the 3mm hole so that there is a
1mm insulation gap from the reg then the thermal strip wich is about 0.5mm thick
sits behind the regulator against the heat sink or chassis this insulates the
reg from chassis you then clamp it up tight to get good thermal
contact
your measureing the input the input can be upto 18v
depending on the psu transformer used if a 240 to 36vac secondary is
used
then it goes through a bridge rectifier circuit
which makes it dc with the filter caps for ripple then this unregulated supply
goes to the power regs which regulate the supply
read the service manual it will tell you the
exceptable voltage for input and output and the ripple percentage allowed before
service
----- Original Message -----From: Christian OnckenSent: Monday, May 07, 2012 2:50 PMSubject: Re: [vintagesynthrepair] Re: Simmons SDEvery strange.. I'm pretty sure the ICs were not insulated from the heat sink when I opened it up. So either they weren't in thermal contact with it with a very small gap, the heat sink compound acted as an insulator, or there were little insulators in there that slipped out when I took it apart.
So I measured the power supply outputs again with the power supply disconnected and found 16v on what I'm pretty sure is supposed to be the 6v output leg of the 7806. I swapped the 7806 out for a new one and the voltages were the same. Any idea what could be causing this?ThanksChristian