I know, with the PS2A series, you have to remove the plastic overlay on the
top panel to remove it, but I am not sure about the newer units. Actually,
it is a pretty cool design, using a PWM scheme to control the power output.
I've got a couple of the units....................I keep one at work (the
small 400kHz unit) and the other one at home (the 13.58MHz unit).
These units do have short circuit and open circuit protection.

Pete

"Chuck Olson" wrote in message
news:Tz5uc.14050$eY2.3710@attbi_s02...
My Metcal RFG-30 soldering system power supply quit on me a week or so
ago,
so yesterday I decided to look into
the problem. After removing 8 screws holding two bottom covers I was able
to slide out the front and back dress panels for very limited access to
fasteners. I couldn't find any way to unfasten the top cover which would
allow separating the two halves of the case, but that turned out to be
unnecessary. The single power transistor, an IRF130 TO-3 case FET was
mounted with nuts on studs that came up through the mounting holes. One
end
had a Nylon shoulder washer under the nut but the other end made
electrical
contact with the case and was found to be barely finger tight. Since that
had to be the drain connection to the device, I gently firmed up that
fastener and reattached the cables to test the unit - - back in operation.
I was particularly impressed with the toroidal power transformer in the
base - - that had to cost the manufacturer some serious cash. If anyone
knows how to remove the plastic top panel, that knowledge will help
improve
the serviceability of this excellent product.

Chuck W6PKP