Inside the Knossos ZM-GM4
We would strongly suggest that you do not attempt to open this mouse; there is much more involved than just pulling a few screws to clean it out.
Inside of the last panel of the ZM-GM4, we found a PCB containing two pad switches to back the page forward and page back buttons. Off to the left is a slider style switch that adds a stiff feel to the "function" button.
After carefully lifting the main PCB out of the frame, we get a much better view of the left-click switch. We found it to be backed by the five million click versions of the Omron D2FC-F7N switches, which offer a softer feel with an audible click.
In the center we have the Avago ADNS A9800 laser sensor as the heart of the system. This top-tier sensor has been proven time and time again to be issue free with the right firmware, and will give you more DPI than you will know what to do with. The switch off to the left is the "auto" button's pad switch.
If the laser sensor is the heart, then the Freescale MC9S08JM16 MCU used in this system is definitely the brains. This is where all the signals pass through to be processed and sent out though the USB 2.0 end of this IC.
As we spin around to the other side of the scroll wheel, we find a matching Omron switch under the right-click button, also offering a five million click lifespan.
After a fair bit of reassembly, we now have the Knossos ZM-GM4 back in once piece, and powered up. The LEDs to the left of the scroll wheel denote we have the DPI in setting one of four. Also, just behind where the cable enters the mouse, there is a slim panel in the nickel plated section that will also glow with a blue LED, but only when the mouse is in motion.