HP P2055 Manual

3.Remove one screw (callout 3), and then slide the media-feed guide toward the formatter side of
the product to remove it.
Figure 6-89   Remove the fuser (2 of 7)
3
4.Disconnect three connectors (callout 4)  and one ground connector (callout 5).
Figure 6-90   Remove the fuser (3 of 7)
4
5
ENWW Internal assemblies 159 

5.Disconnect one connector (callout 6).
Figure 6-91   Remove the fuser (4 of 7)
6
6.Release three tabs (callout 7), and th en remove three gears (callout 8).
Figure 6-92   Remove the fuser (5 of 7)
8
7
160 Chapter 6   Removal and replacement ENWW 

7.Remove three screws (callout 9).
Figure 6-93   Remove the fuser (6 of 7)
9
8.Carefully remove the fuser.
Figure 6-94   Remove the fuser (7 of 7)
ENWW Internal assemblies 161 

Reinstall the fuser
1.The drive gears must be correctly aligned when the fuser is reinstalled or replaced. The gears are
keyed and can only be installed when they are correctly aligned.
Figure 6-95   Reinstall the fuser (1 of 2)
2.Make sure that the ground connector is correctly  fastened and fully seated on the connector lug.
Figure 6-96   Reinstall the fuser (2 of 2)
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Engine controller unit (ECU)
WARNING! ESD sensitive component.
CAUTION:The ECU might be hot. Allow enough time for the ECU to cool after the product power is
turned off.
1. Remove the following components:
● Right cover. See 
Right cover on page 115.
● Left cover. See 
Left cover on page 118.
● Rear cover, rear door, and d
uplex-paper-feed assembly. See 
Rear cover, rear door, and
duplex-paper-feed assembly on page 120.
NOTE: Only the HP LaserJet P2050 Series products have a duplex-paper-feed assembly...

3.Remove one screw (callout 3) and release the wi re harnesses from the retainers (callout 4).
Figure 6-98   Remove the ECU (2 of 14)
3
4
4.Slide the media-feed guide toward the formatter side of the product to remove it.
Figure 6-99   Remove the ECU (3 of 14)
1
2
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5.Disconnect two connectors (callout 5).
Figure 6-100   Remove the ECU (4 of 14)
5
6.Remove one screw (callout 6).
Figure 6-101   Remove the ECU (5 of 14)
6
ENWW Internal assemblies 165 

7.Disconnect one FFC (callout 7) and two connecto rs (callout 7), and then remove two screws
(callout 8).
CAUTION: Do not bend or fold the flat flexible cables (FFCs) during removal or installation. Also,
do not straighten pre-folds in the FFCs. You  must make sure that all FFCs are fully seated in their
connectors. Failure to fully seat an FFC into a connector can cause a short circuit in a PCA.
NOTE: Place a mark on one of the cartridge-door interlock switch wires before you disconnect
them, so that...

9.Use a small flat blade screwdriv er to release the sheet-metal tab in the product chassis.
CAUTION:Carefully push the tab toward the outside of the product to release it. Do not bend the
tab so much that it will not engage the ECU  mounting bracket when the ECU is reinstalled.
Figure 6-104  Remove the ECU (8 of 14)
10.Pull the ECU down until the mounting  bracket is below the sheet-metal tab.
Figure 6-105   Remove the ECU (9 of 14)
ENWW Internal assemblies 167 

11.Slightly raise the formatter side of the ECU.
Figure 6-106   Remove the ECU (10 of 14)
12.Use a small flat blade screwdriver to releas e the sheet-metal tab in the product chassis.
CAUTION:Carefully pull the tab toward the outside of the product to release it. Do not bend the
tab so much that it will not engage the ECU mounting bracket when the ECU is reinstalled.
Figure 6-107   Remove the ECU (11 of 14)
168 Chapter 6   Removal and replacement ENWW