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!
Pin Name
S2 S1 COM4 COM3 COM2 COM1 DBR4 DBR3 DBR2 DBR1 RESET HCTR VDD FMIN AMIN GND PLL OUT LPF OUT VT GND TEST 1 XIN
I/O
O O O O O O I I I O I I LCD segment output. LCD segment output. LCD commn output 4. LCD commn output 3. LCD commn output 2. LCD commn output 1. LCD reference voltage. LCD reference voltage. Voltage doubler boosting. Voltage doubler boosting. System reset input. Pulse out. Supply voltage terminal. FM oscillator signal input. AM oscillator signal input. Ground terminal. Phase comparison output. LPF output. VT input. Ground terminal. Connected to ground. Crystal 75kHz oscillator pin.