I was very glad recieving the service manal from You. Additionaly very fast. Extremaly nice servicing. Thanks very mach! Now my GX-220 working better, than it was made. Alexander from Moscow, Russia/
Sweet! I won the item on eBay and couldn't adjust the geometry or even keep a steady picure. This guide has the full schematics (not available anywhere else as far as I could tell), and was a bargain for the wealth of knowledge it contains. I hooked it up to my testing equipment, tweaked a few potentiometers and got it playing videogames in no time. Thanks!
Great Manual! It contains all the wiring schematics and mechanical exploded views that are essential for service and repair. I was surprised I even found this for such an old machine. Only wish I knew of this site many years ago.
Text excerpt from page 5 (click to view)
3. Mac (Memory All Clear) operation
Procedure A (1) Plug the power cord into an outlet. (2) Pressing the FEED button and turn the mode switch to PRG position. (3) Release the FEED button. After few seconds, MAC operation will be executed. (4) The following receipt will be issued, if completed. Procedure B (1) Remove the power cord from AC outlet. (2) Remove the memory protection batterey. (3) Leave the machine for few minutes. (4) Plug the power cord to AC outlet and then MAC operation is executed. (5) Set the memory protection battery.
