Jcm Gen 5 Manual ((better)) Here

Neglecting regular maintenance is the primary cause of component failures and bill rejections. In high-traffic environments, clean the unit at least once a month. Step-by-Step Cleaning Routine Disconnect power from the validator.

Inspect the interface harness for pinched wires. Check the host ground connection; static electricity buildup from sliding plastic components can crash the validator's microprocessor. jcm gen 5 manual