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Use a voltmeter in Ohm mode, and you should have a maximum reading of 0.1 Ohm. If you have a higher reading, it means that a trace is severed or damaged. The naked eye may not be able to detect dry solder joints or micro cuts.
The copper and tin on these electronic circuits are old.
You need to do point-to-point wiring from the cartridge slot to the chip. Pay special attention to the contacts by following the traces, as well as any through-holes. Take a marker and note what is working correctly, for example, use black for good connections and red for problematic ones. Once you identify a fault, start by removing the old solder and apply fresh solder. If the circuit is still not closed, use a jumper wire as a last resort. |
