HP P2055 Manual

							5.Remove the face-down-drive or  duplexing-paper-feed assembly.
CAUTION:Some of the gears and the solenoid arm are not captive (callout 4). Do not lose the
gears or arm when you remove the assembly.
Figure 6-123   Remove the face-down-drive or duplexing-paper-feed assembly (4 of 4)
4
ENWW Internal assemblies 179 
						

							Duplex solenoid; HP LaserJet P2050 Series
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 duplex-paper-feed assembly. See 
Rear cover, rear door, and
duplex-paper-feed assembly on page 120
.
NOTE: Only the HP LaserJet P2050 Series prod ucts have a duplex-paper-feed assembly
installed.
● Top cover assembly. See Top-cover assembly on page 124
.
● Fan. See 
Fan on page 140
.
● Duplexing-paper-feed assembly. See 
Face-down-drive or duplexing-paper-feed assembly
on page 177.
2. Disconnect one connector (callout 1), and then remove one screw (callout 2).
CAUTION: The gear and the solenoid arm that are exposed when the duplexing-paper-feed
assembly is removed are not captive (callout 3). Do not lose the gear or arm when you remove the
solenoid.
Figure 6-124   Remove the duplex solenoid; HP LaserJet P2050 Series
3
1
2
180 Chapter 6   Removal and replacement ENWW 
						

							Paper-retaining-delivery assembly
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
installed.
● Top cover assembly. See Top-cover assembly on page 124.
● Reverse-sensor assembly. See 
Reverse-sensor assembly; HP LaserJet P2050 Series
on page 142
.
NOTE: Only the HP LaserJet P2050 Series pr oducts have a reverse-sensor assembly
installed.
● Face-down-drive or duplexing-paper-feed assembly. See Face-down-drive or duplexing-
paper-feed assembly on page 177
.
2. Disconnect one connector (callout 1), release the wi re harness from the retainers (callout 2), and
then pass the wire harness though the hole in the chassis (callout 3).
Figure 6-125   Remove the pape r-retaining-delivery assembly (1 of 6)
3
2
1
ENWW Internal assemblies 181 
						

							3.Release one tab (callout 4), and then remove one gear (callout 5).
Remove two screws (callout 6), and then release  the wire harness from the guides (callout 7).
Figure 6-126   Remove the paper-retaining-delivery assembly (2 of 6)
4
6
5
7
4.Remove two screws (callout 8).
Figure 6-127   Remove the paper-retaining-delivery assembly (3 of 6)
8
182 Chapter 6   Removal and replacement ENWW 
						

							5.Carefully separate the assembly from the chassis,  and then raise the end of the assembly to release
it.
Figure 6-128   Remove the pape r-retaining-delivery assembly (4 of 6)
6.Slide the assembly toward the formatter side of the product to release it.
Figure 6-129   Remove the pape r-retaining-delivery assembly (5 of 6)
ENWW Internal assemblies 183 
						

							7.Remove the paper-retaining-delivery assembly
Figure 6-130   Remove the paper-retaining-delivery assembly (6 of 6)
184 Chapter 6   Removal and replacement ENWW 
						

							7 Solve problems
To use the information in this chapter, you should have a basic understanding of the HP LaserJet printing
process. Explanations of each mechanical assembly, the product systems, and the basic theory of
operation are contained in 
Theory of operation on page 79 . Do not perform any of these troubleshooting
processes unless you understand the function of each product component.
NOTE:  Unless otherwise noted, all i llustrations depicting the HP LaserJet P2050 Series Printers are
also valid for the HP LaserJet P2030 Series Printers.
●Solve general problems
●
Menu map (HP LaserJet P2050 Series Printers only)
●
Troubleshooting process
●
Tools for troubleshooting
●
Problem-solve diagrams
●
Status-light patterns (HP LaserJet P2030 Series Printers only)
●
Status-alert messages (HP LaserJet P2030 Series Printers only)
●
Interpret control-panel messages (HP LaserJet P2050 Series Printers only)
●
Event-log messages
●
Paper-handling problems
●
Solve image-quality problems
●
Solve print-quality problems
●
Solve performance problems
●
Solve connectivity problems
●
Service mode functions
ENWW 185 
						

							Solve general problems
If the product is not responding correctly, complete the steps in the following checklist, in order. If the
product does not pass a step, follow the corresponding troubleshooting suggestions. If a step resolves
the problem, you can stop without performing the other steps on the checklist.
Troubleshooting checklist
1.Make sure the product Ready light is on.  If no lights are on, complete these steps:
a. Check the power-cable connections.
b. Check that the power switch is on.
c. Make sure that the line voltage is correct for the product power configuration. (See the label
that is on the back of the product for voltage  requirements.) If you are using a power strip and
its voltage is not within specifications, plug the  product directly into the wall. If it is already
plugged into the wall, try a different outlet.
d. Verify that connectors J2 and J7 on the formatter PCA are seated. See 
Figure 7-3
Components on the left side of the product on page 196.
e. Perform an engine test. If the test is successful, replace the control panel and then the
formatter PCA. See 
Top-cover assembly on page 124, Formatter PCA; HP LaserJet P2030
Series on page 130, or Formatter PCA; HP LaserJet P2050 Series on page 132.
2. Check the cables.
a. Check the cable connection between the prod uct and the computer or network port. Make
sure that the connection is secure.
b. Make sure that the cable itself is not faulty by using a different cable, if possible.
c. Check the network connection. See 
Solve network problems on page 249.
3. Check to see if any messages appear on the control-panel display. If any error messages appear,
see 
Interpret control-panel messages (HP La serJet P2050 Series Printers only) on page 219.
4. Check to see if any control-panel lights are lit. See 
Status-light patterns (HP LaserJet P2030 Series
Printers only) on page 209.
5. Make sure that the print media that you are using meets specifications.
6. Print a configuration page. See 
Print the information pages on page 48.
a. If the pages do not print, check that at least one tray contains print media.
b. If the page jams in the product, see 
Clear jams on page 230.
7. If the configuration page prints, check the following items.
 If the page prints correctly, then the product hardware is working. The problem is with the
computer that you are using, with th
e printer driver, or with the program.
8. Select one of the following options:
Windows : Click Start , click Settings, and then click  Printers, or Printers and Faxes . Double-
click the name of the product.
186 Chapter 7   Solve problems ENWW 
						

							-or-
Mac OS X: Open Print Center  or Printer Setup Utility , and double-click the line for the product.
9. Verify that you have installed the printer driver for this product. Check the program to make sure
that you are using the printer driver for this product.
10. Print a short document from a different program that  has worked in the past. If this solution works,
then the problem is with the program that you are us ing. If this solution does not work (the document
does not print), complete these steps:
a. Try printing the job from another computer that has the product software installed.
b. If you connected the product to the network, connect the product directly to a computer with
a USB cable. Redirect the product to the correc t port, or reinstall the software, selecting the
new connection type that you are using.
Factors that affect product performance
Several factors affect the ti me it takes to print a job:
● Maximum product speed, measured
 in pages per minute (ppm)
● The use of special paper (such as transpare
ncies, heavy paper, and custom-size paper)
● Product processing and download time
● The complexity and size of graphics
● The speed of the computer you are using
● The USB connection
● The product I/O configuration
● The amount of memory installed in the product
● The network operating system and 
configuration (if applicable)
NOTE:Although additional memory can improve how the product handles complex graphics and
improve download times, it will not in crease maximum product speed (ppm).
ENWW Solve general problems 187 
						

							Basic problem solving
Table 7-1  Basic problem solving
ProblemCauseSolution
When the product is connected to a
correctly grounded power source, the
LEDs on the control panel do not
illuminate and the main motor does not
rotate.
The product does not turn on.No power to the product.1.Verify that the power switch is
turned on.
2. Verify that the power cable is
correctly plugged into the outlet and
the product.
3. Verify that the power outlet has the
correct voltage.
The power inlet/switch cable assembly is
defective.Replace the power inlet/switch cable
assembly. See 
Inlet-cable assembly
on page 150.
The ECU is defective.Replace the ECU. See Engine controllerunit (ECU) on page 163.
When turned on, the LEDs on the control
panel light up, but the main motor does
not rotate.
The product turns on, but the motor does
not rotate.The print-cartridge door is open.Close the print-cartridge door.
Media is jammed in the paper path.Clear all media from the paper path, and
make sure that all sensors are working
correctly.
The cable is not connected correctly.Reconnect the motor cable.
The motor is not mounted correctly in the
product chassis.Verify that the motor is connected
correctly and that it rotates freely.
A gear is damaged or jammed.Replace the gear assembly. See Paper-
pickup-gear assembly on page 134.
The ECU is defective.Replace the ECU. See Engine controller
unit (ECU) on page 163.
The main motor is defective.Replace the motor. See Main motor
on page 174.
The product turns on and the motor
rotates, but none of the control-panel
lights turn on, and pressing the control-
panel buttons has no effect.
The product is unresponsive.The control-panel cable is not connected
correctly.Reconnect the control panel cable.
The control panel is defective.Replace the control panel. See Top-
cover assembly on page 124.
The formatter is defective.Replace the formatter. See Formatter
PCA; HP LaserJet P2030 Series
on page 130 or Formatter PCA; HP
LaserJet P2050 Series on page 132.
The product is on, but the control-panel
lights indicate that the product is not in
the ready state.
The product is not ready. The product has an internal error that
was detected during the Power-On Self-
Test sequence.
Consult the list of control-panel light
patterns to identify and correct the error.
188 Chapter 7   Solve problems
ENWW