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 15 (click to view)
ELECTRICAL ADJUSTMENTS
2-13: TINT 1. Receive the NTSC color bar pattern. (Audio Video Input) 2. Using the remote control, set the brightness and contrast to normal position. 3. Connect the oscilloscope to TP024. 4. Activate the adjustment mode display of Fig. 1-1 and press the channel button (20) on the remote control to select "TINT". 5. Press the VOL. +/- button on the remote control until the section "A" becomes a straight line. (Refer to Fig. 2-2) 2-15: Confirmation of Fixed Value (Step No.) Please check if the fixed values of the each adjustment items are set correctly referring below. NO. FUNCTION 02 04 06 07 09 10 18 19 20 21 23 24 26 27 30 Fig. 2-2 2-14: CONTRAST CENT 1. Activate the adjustment mode display of Fig. 1-1 and press the channel button (22) on the remote control to select "CONTRAST CENT". 2. Press the VOL. +/- button on the remote control until 3. 4. 5. the contrast step No. becomes "35". Receive a broadcast and check if the picture is normal. Set to the AV mode. Activate the adjustment mode display of Fig. 1-1 and press the channel button (22) on the remote control to select "CONTRAST CENT". Press the VOL. +/- button on the remote control until the contrast step No. becomes "44". Receive a broadcast and check if the picture is normal. 31 32 33 34 35 36 37 38 AGC GAIN R CUTOFF G CUTOFF B DRIVE V POSI (50) V POSI (60) BRIGHT MAX BRIGHT MIN TINT SHARP CONTRAST MAX CONTRAST MIN COLOR MAX COLOR MIN M B CUT OFF CVBS OUT APR THRESHOLD BELL FILTER BANDPASS H POSI OSD V POSI OSD H POSI TEXT V POSI TEXT RF 00 00 00 45 08 00 40 09 32 04 50 10 50 10 127 31 00 05 00 118 50 122 58 AV ------------40 09 ADJ. 04 50 10 50 10 -------------------
"A"
* To check for the fixed values of the RF (60Hz), indicate the adjustment mode screen while input the 60Hz video signal.
