LCD panel is dark and keys are not
working
◼ The cable between main PCB and LCD panel
is loose.
◼ Check if the cable between main PCB and LCD is
secured or not.
LCD panel is dark but the LEDs are
light
◼ The printer initialization is unsuccessful.
◼ Turn OFF and ON the printer again.
◼ Initialize the printer.
Ribbon encoder sensor doesn’t
work
◼ The ribbon encoder sensor connector is loose.
Ribbon end sensor doesn’t work
◼ The connector is loose.
◼ The ribbon sensor hole is covered with dust.
◼ Check the connector.
◼ Clear the dust in the sensor hole by the blower.
◼ The connector is loose.
◼ Plug in the connect cable correctly.
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