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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/
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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!
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It was just what I need to fix my old BMW's CD player. Very convenient also. Thank you.
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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.
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Great manual very clear copied. You are making an incredible job. I appreciate a lot the rapidity and your efficiency. Thanks a lot
VERTÄ°CAL DEFLECTION CIRCUIT DEFECTS
There is a horizontal line on the screen
Check 16 VDC at pin 3 of IC501.
NO
Check and replace R127 (at pin 20 of IC101), C126 (at pin 21 of IC101), R526, D513, C527, R521.
YES
Check 35 VDC at pin 6 of IC501.
NO
Flyback lines are visible. Check and replace R527, D512, C526, R522, C517.
YES
Check 2.2 VDC at pin 1 of IC501.
NO
If R122 is open IC501 becomes defective and 16 VDC components fail. Check them before replacing IC501.
YES
Check 2.2 VDC at pin 2 of IC501.
NO
Lower half of the screen is black. Check and replace R123 and IC101.
YES NO
Check 7.4 VDC at pin 7 of IC501. Check 7.2 VDC at pin 4 of IC501.
A Horizontal line is visible. Check and replace R518, R519 and IC501.
YES
Replace IC501
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