Complying with Photogem's desire in the post #73, attached a guide for dismantling the diaphragm control block.
This operation is very complex, and requires a high rating to perform the welds of the circuits that are involved.
50 welding joints must be disoldered and then rewelded with eco-friendly welding alloys, which require 10 to 20% more heat than conventional Tin Lead alloys, which significantly raises the qualification of the labor. There are critical solder joints on the motherboard and on the shutter curtain and bock control plate of the diaphragm control.
There is also another complex operation which is the reset the sensor registration distance (because it is absolutely necessary to disassemble the K-mount ring).
For this it is necessary to have comparators that are able to measure the hundredth of a millimeter, a guaranteed flat marble, cylindrical supplements of proven measures to enable measurement, and the most complex to perform the measurement procedure that guarantees the positioning of the sensor.
If this operation is not guaranteed, the camera will never bring infinity focus.
Anyone who ventures into this operation should thoroughly read some workshop manual from a similar camera. (I use the workshop manual of an IST camera), which describe the process very well and are on the internet.
For KS2, the surface disarm process given by Photogem is correct.
After disassembling the camera housing, the top cover must be disassembled. (there are 9 welds and a molex connector for this disassembly)
Then disassemble the back cover and display (two molex connectors and 4 screws)
Then disassemble the mother board. (nine molex connectors of different types, 26 welded joints, and four screws
Then disassemble the battery case (two flash capacitor welds, 6 curtain control welds, 4 FCC circuit diaphragm control welds, and 6 screws)
Then disassemble the K-mount ring and lock lens, trying to respect the mounting supplements, to reuse them in the assembly. (5 ring screws and one of the lens lock)
Then disassemble the diaphragm control block. (4 screws and 6 welds, 4 of the pulse counter, an 2 of the solenoid)
Verification of all parts, contacts and cleaning of all components, lubrication and reverse mounting of the diaphragm control.
Checking and correcting the registration distance, final assembly, testing and closing of the housing.
As you can see it is a very complex operation with two critical operations that determine the quality of the work; welding and checking the registration distance.
Attached some photos indicating the main screws for the disassembly of the battery box.
I hope you're a good guide.
Greetings