Before diving into the PDF schematic, here are the most frequent issues encountered with the GP41 chassis: Check the main fuse and the bridge rectifier.
These tables list the expected DC voltages at every pin of the major ICs. panasonic tc-21rx20c circuit diagram pdf
Always discharge the anode of the CRT before working near the flyback transformer. Use an isolation transformer when measuring live voltages. Before diving into the PDF schematic, here are
Look for cold solder joints around the deflection yoke connector. Before diving into the PDF schematic