Videopac G7200

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Chip Info


Schematic


Adjustments

Paraphrased from the Service Manual

Power Supply Voltage
Select mid-position of R168, R504, R510, R25, R35 and R37
Connect a voltmeter to +5 (C201) and switch the set on
Adjust R168 for a meter reading of 5v
Horizontal Oscillator
Connect IC500 pin 8 to ground
Connect a frequency counter to IC500 pin 3
Adjust R510 for 15625Hz
Disconnect pin 8 ground connection
Vertical Oscillator
Connect pin 11 of IC500 to ground
Connect a frequency counter to IC500 pin 15
Adjust R504 for 45Hz
Disconnect ground connection from pin 11
Picture Height
Adjust R25
Luminance
Adjust R37 for minimum luminance
Adjust R35 until the screen just lights up