Sensors
NOTE:
For information about removing the 500-sheet media sensor, see Media sensor (500-sheet feeder) on page 166 in this chapter.
Cassette media sensor (HP LaserJet 3600/3800/CP3505)
NOTE:
Always perform a full calibration procedure when you replace the cassette media sensor.
CAUTION:
PCAs are sensitive to electrostatic discharge (ESD). Look for the ESD reminder when removing PCAs. Always perform service work at an ESD-protected workstation or mat. If an ESD workstation or mat is not available, ground yourself by touching the sheet-metal chassis before touching an ESD-sensitive part.
Protect the ESD-sensitive parts by placing them in ESD pouches when they are out of the printer.
1.
Open the front cover and remove the ETB. See
Electrostatic transfer belt (ETB) on page 94 .
2.
Release the locking tab (callout 1) on the pickup-and-feed driver PCA cover (callout 2), and then remove the cover.
CAUTION:
Do not damage or bend the print-cartridge high-voltage springs (callout 3) when you remove the cover.
Figure 5-103
Remove the cassette media sensor (1 of 2)
3
2
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150 Chapter 5 Removal and replacement ENWW
3.
Disconnect one connector (callout 4) and remove one screw (callout 5). Lift the cassette media sensor (callout 6) out of the printer.
Figure 5-104
Remove the cassette media sensor (2 of 2)
4
6
ENWW Sensors 151
Temperature sensor
CAUTION:
PCAs are sensitive to electrostatic discharge (ESD). Look for the ESD reminder when removing PCAs. Always perform service work at an ESD-protected workstation or mat. If an ESD workstation or mat is not available, ground yourself by touching the sheet-metal chassis before touching an ESD-sensitive part.
Protect the ESD-sensitive parts by placing them in ESD pouches when they are out of the printer.
1.
Remove the following components:
●
Upper cover. See
Upper cover (fuser door) on page 80
.
●
Rear lower cover. See
Rear lower cover on page 83 .
●
Left cover. See
Left cover on page 84 .
●
Right cover. See
Right cover on page 87 .
●
Rear upper cover. See Rear upper cover on page 91
.
2.
Disconnect one connector (callout 1; J1018) and release the locking tab (callout 2). Remove the temperature sensor (callout 3).
Figure 5-105
Remove the temperature sensor
1
3
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152 Chapter 5 Removal and replacement ENWW
Paper and registration sensor covers
1.
Open the front cover and remove the ETB. See
Electrostatic transfer belt (ETB) on page 94 .
2.
Remove two screws (callout 1) and the paper and registration sensor covers (callout 2).
CAUTION:
Do not bend the locator tabs on the covers.
Figure 5-106
Remove the paper and registration sensor covers
1
2
ENWW Sensors 153
Cartridge-sensor PCA
CAUTION:
PCAs are sensitive to electrostatic discharge (ESD). Look for the ESD reminder when removing PCAs. Always perform service work at an ESD-protected workstation or mat. If an ESD workstation or mat is not available, ground yourself by touching the sheet-metal chassis before touching an ESD-sensitive part.
Protect the ESD-sensitive parts by placing them in ESD pouches when they are out of the printer.
1.
Remove the following components:
●
Upper cover. See
Upper cover (fuser door) on page 80
.
●
Rear lower cover. See
Rear lower cover on page 83 .
●
Left cover. See
Left cover on page 84 .
●
Right cover. See
Right cover on page 87 .
●
Rear upper cover. See Rear upper cover on page 91
.
2.
Remove four screws (callout 1) and remove the sheet-metal shield (callout 2).
Figure 5-107
Remove the cartridge-sensor PCA (1 of 4)
2
1
154 Chapter 5 Removal and replacement ENWW
3.
Disconnect all of the wire-harness connectors and flat flexible cables (FFCs) on the DC controller
PCA (eight wire-harness connectors and eight FFCs).
CAUTION:
Do not bend or fold the FFCs during removal or installation.
NOTE:
Remove the wire-harnesses from all of the retainers near the DC controller.
Figure 5-108
Remove the cartridge-sensor PCA (2 of 4)
ENWW
4.
Remove 10 screws (callout 3). Push up on the sheet-metal shield to release it from the printer chassis, and remove it.
Figure 5-109
Remove the cartridge-sensor PCA (3 of 4)
3
Sensors 155
5.
Disconnect four connectors (callout 4) and remove three screws (callout 5). Remove the cartridgesensor PCA from the printer.
Figure 5-110
Remove the cartridge-sensor PCA (4 of 4)
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156 Chapter 5 Removal and replacement ENWW
