My pics are by no means comprehensive. I was mainly looking with regards to maintenance of the white rotary encoder and the main volume knob.
Apologies for the quality of the pics, such is life I only found out that I took the pics in the wrong mode after I'd put the Radias all back together again! Consequently they're a bit grainy.
^ 1) with the backplate removed.
^ 2) A perspective shot showing the layers of PCBs. Top-left is the PCB for all the jack sockets, it's still attached to the main silver front chassis.
^ 3) from the other side.
^ 4) I completely removed the whole silver front chassis (front panel and socket plate), and rotated it 180º. Only the PCBs remain. In the above shot I'm just moving the jack socket PCB out of the way.
^ 5) The PCBs by themselves. With the jack socket PCB now out of the way, the dotted red circle toward the right shows roughly where the white encoder is attached (to the very lowest PCB).
^ 6) Above shows the three solder "feet" of the rotary encoder attached to the lowest PCB. To get to this layer (in order to replace my encoder) removal of the upper PCB layers will be needed when I come to do it.
^ 7) shows the footprint of the volume knob pot (I will be replacing this knob too).
^ 8 ) Turned the other way. This pic shows the front of the Radias with the chassis/fascia completely removed. You don't even need to take off any of the knobs!
^ 9) Something to be VERY aware of if you ever do this yourself: When you take the chassis off the front fascia, there are lots of small transparent pieces of plastic that fall out (such as circled).
These transparent pieces of plastic act as magnifiers for the LEDs, as the the LEDs themselves are actually countersunk by quite some way (about 1cm deep) beneath the front fascia. These bits of plastic bridge the gap, and to the outer world they look like real LEDs.
^ 10) As you can see there are quite a few of them! They all fall out together (if you tilt the PCB past 90º), as nothing holds them in. Great care must be taken to not to lose any. They're hard to spot when they fall out (as many of them are for single LEDs, in which case they're even smaller), and they could be very easily scattered.
So it appears with a little courage, and a lot of labelling (there are lots of different types of screws used on the main silver fascia and below), and with care not to lose the plastic LED inserts, you should be able to do maintenance on the Radias (if after the warranty has expired). Now to see if Korg will sell me a new encoder and volume pot....
