- HP Laserjet Enterprise CP4020/CP4520 Manual

Cause Solution
The paper-feeder pickup solenoid is defective. Run the solenoid drive test in the actuator drive mode to verify that the paper-
feeder pickup solenoid is functioning properly. If it is not, replace the pickup
assembly of the specific tray. See
Pickup assembly (optional paper feeder)
on page 226.
Poor contact of paper-feeder pickup motor
drive connector.
Reconnect the connector (J409) on the paper feeder driver PCA and connector
(J14).
The paper-feeder pickup motor is defective. Run the pickup motor drive test in the actuator drive mode to verify that the
paper-feeder pickup motor is functioning properly. If it is not, replace the pickup
assembly of the specific tray. See
Pickup assembly (optional paper feeder)
on page 226.
Multiple feed of media If the tray 3 pickup roller, separation roller, or feed roller is worn or deformed,
replace any defective parts. See
Feed and separation rollers (Trays 2-5)
on page 86.
The paper-feeder media-feed sensor lever is
set incorrectly or damaged.
Check the sensor lever to make sure it is set correctly. If it is damaged, replace
the paper-feeder assembly.
The spring of the paper-feeder media-feed
sensor lever is unhooked.
Check the spring and place it in correct position.
Poor contact of the paper-feeder media-feed
sensor connector.
Reconnect the connector (J406) on the connector PCA and connector (J22) of
the paper-feeder media feed sensor.
A tray feed sensor is defective. Run the manual sensor test to verify that the tray feed sensor is functioning
properly. See
Manual sensor test 2 (special-mode test) on page 259 for
information. If it is not, replace the pickup assembly of the specific tray. See
Pickup assembly (optional paper feeder) on page 226.
Table 3-29 Causes and solutions for residual media jams
Cause Solution
The sensor that detects residual paper jams is
set incorrectly or damaged.
Run the manual sensor test to verify which sensor detects the paper. See
Manual sensor test 2 (special-mode test) on page 259 for information. Check
the sensor lever to make sure it is set correctly. If it is damaged, replace the
corresponding pickup assembly. See
Pickup assembly (optional paper
feeder) on page 226.
The spring of the sensor lever that detects
residual paper jams is unhooked.
Run the manual sensor test to verify which sensor detects the paper. See
Manual sensor test 2 (special-mode test) on page 259 for information. Check
the spring of the sensor lever to make sure it is set correctly.
Poor contact exists in the sensor that detects
residual paper jams.
Run the manual sensor test to verify which sensor detects the paper. See
Manual sensor test 2 (special-mode test) on page 259 for information.
Reconnect the following corresponding sensor connectors:
●
Tray 3: Reconnect connectors (J408) and (J13)
●
Tray 4: Reconnect connectors (J406) and (J22)
●
Tray 5: Reconnect connectors (J403) and (J32)
The sensor that detects residual paper jams is
defective.
Run the sensor test in the sensor monitor mode to verify which sensor detects
the paper. Replace media feed sensor 1, 2 or 3.
Table 3-28 Causes and solutions for pickup delay and pickup stationary jams (continued)
ENWW Clear paper jams 401