- HP Laserjet Enterprise CP4020/CP4520 Manual

M front-door switch
1. Open the front-door assembly to disengage the front-door switch.
Figure 3-17 Test the front-door switch
2. Close the front-door assembly, and then check the control panel on the product for sensor
response.
TIP: You can leave the front door open and use a slender blade screw driver or pencil to activate
the switch.
3. If there is no response, replace the front-door switch.
ENWW Tools for troubleshooting 257