4.7 Black Mark Sensor / Gap Sensor (Receiver) Replacement
Black mark sensor is reflection type sensor. It is connected to JP4 (3 pin connector). A
multi-meter is used to measure the signal of Pin2 to see if there is voltage variation
when black mark is detected. Before conducting the test, please issue the BLINE
command first. The printer will switch from gap sensor to black mark sensor. If there is
no voltage variation, please follow steps below to replace the black mark sensor / gap
sensor (receiver) PCB.
1. Follow the instructions in Section 4.2 to take out the mechanism.
2. Remove two flat tap screws and black mark sensor PCB.
3. Reassemble the removed parts in the reverse order of removal.
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