About Photocoupler Sensors

Function: Use optical signals to achieve electrical isolation between input and output, while transmitting signals or control information.
How to judge whether the optocoupler sensor is damaged in our printer：
1. Observe the light behind the motherboard. When an object blocks the middle of the optocoupler sensor, the light of the motherboard will flash. If it does not flash, the optocoupler is damaged.
How to replace the optocoupler sensor:
1.Use a screwdriver to remove
2.Replace with a new one and install it，being careful not toreverse the wiring