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.
Great manual very clear copied. You are making an incredible job. I appreciate a lot the rapidity and your efficiency. Thanks a lot
Text excerpt from page 8 (click to view)
ELECTRICAL ADJUSTMENTS
Read and perform this adjustment when repairing the circuits or replacing electrical parts or PCB assemblies.
CH-2
1. BASIC ADJUSTMENT
1-1: SWITCHING POINT
6.5H
CONDITIONS
MODE-PLAYBACK Input Signal-Alignment Tape (MHP) INSTRUCTIONS 1. Connect CH-1 on the oscilloscope to TP3002 and CH-2 to TP8001. 2. Playback the alignment tape. (MHP) 3. Press and hold the Tracking-Auto button on the remote control more than 2 seconds to set tracking to center. 4. Press both CH UP button on the set and the STOP button on the set for more than 2 seconds.
6.5H
CD502 CP651 CP1701 CP8002
ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (Connector Connections)
AC IN