HP P2055 Manual

							ProblemCauseSolution
The product turns on, the motor rotates,
and the control panel indicates the
ready state, but the product does not
print.
The product does not print.A component is defective.Perform an engine test to verify print-
engine components.
1.Print an engine test page. See
Engine test page on page 251.
2. If the engine test page does not
print, check all the connectors on
the ECU, and reconnect any cables
that are connected incorrectly.
3. If, after checking the connectors,
the error persists, replace the ECU.
See 
Engine controller unit (ECU)
on page 163.
The formatter is defective.Press the  Go button to print a Demo
page. If the Demo page does not print,
replace the formatter. See 
FormatterPCA; HP LaserJet P2030 Series
on page 130 or Formatter PCA; HP
LaserJet P2050 Series on page 132 .
The product prints the engine test and
the Demo page, but does not print jobs
sent from a computer.
The product does not print from a
computer. The cable is not connected correctly.Reconnect the cable.
An incorrect driver is selected.Select the correct printer driver.
The printer driver is not installed
correctly.Remove and then reinstall the product
software. Make sure that you use the
correct procedure and port setting.
Other devices are connected to the
product (for example, through a switch or
hub) that are interfering with the
computer-product communications.Disconnect the other 
devices, switches,
or hubs.
There is a computer-port
communications problem.Reset the computer port settings (see
the computer user guide for more
information).
The formatter is defective. Replace the formatter. See FormatterPCA; HP LaserJet P2030 Series
on page 130 or Formatter PCA; HP
LaserJet P2050 Series on page 132.
Table 7-1   Basic problem solving (continued)
ENWW Solve general problems 189 
						

							Menu map (HP LaserJet P2050 Series Printers only)
Print a menu map1.Press  OK to open the menus.
2. Use the arrow buttons to navigate to the  Reports submenu, and then press  OK.
3. Use the arrow buttons to navigate to the  Menu structure submenu, and then press  OK to print the
menu structure.
4. Press  X to exit the menus.
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							Troubleshooting process
When the product malfunctions or encounters an unexpected situation, the product control panel alerts
you to the situation. This chapter contains information to help diagnose and solve problems.
● Use the pre-troubleshooting checklist to evaluate 
the source of the problem and to reduce the
number of steps that are required to fix the problem.
● Use the troubleshooting flowchart to pinpoint 
the root cause of hardware malfunctions. The
flowchart guides you to the appropriate section of  this chapter that provides steps for correcting
the malfunction.
Before beginning any troubleshooting pr ocedure, check the following conditions:
● Are supply items within their rated life?
● Does the configuration page reveal any configuration errors?
NOTE:
The customer is responsible for checking supplies and for using supplies that are in good
condition.
Pre-troubleshooting checklist 
The following table includes basic questions to ask the customer to quickly help define the problem or
problems.
General topicQuestions
Environment● Is the product installed on a solid, level surface (+/- 1°)?
● Is the power-supply voltage within ± 10 volts of the specified power source?
● Is the power-supply plug inserted in the product and the outlet?
● Is the operating environment within the specified parameters?
● Is the product exposed to ammonia gas, su
ch as that produced by diazo copiers
or office cleaning materials?
NOTE: Diazo copiers produce ammonia gas as part of the coping processes.
Ammonia gas (from cleaning supplies or  a diazo copier) can have an adverse
affect on some product components (for example, the print-cartridge OPC).
● Is the product exposed to direct sunlight?
Media●Does the customer use only supported media?
● Is the media in good condition (no curls, folds, or distortion)?
● Is the media stored correctly and within environmental limits?
Input trays●Is the amount of media in the tray within specifications?
● Is the media placed in the tray correctly?
● Are the paper guides aligned with the media?
● Is the cassette correctly installed in the product?
Print cartridges●Is each print cartridge correctly installed?
Transfer unit and fuser
●Are the transfer unit and fuser installed correctly?
ENWW
Troubleshooting process 191 
						

							General topicQuestions
Covers●Is the front cover closed?
Condensation●
Does condensation occur following a temp
erature change (particularly in winter
following cold storage)? If so, wipe affected area dry or leave the product on
for 10 to 20 minutes.
● Was a print cartridge installed soon after being moved from a cold to a warm
room? If so, allow the print cartridge to sit at room temperature for 1 to 2 hours.
Miscellaneous
●Check for and remove any non-HP components (print cartridges, memory
modules, and EIO cards) from the product.
● Remove the product from the network and make sure that the failure is
associated with the product before beginning troubleshooting.
● For any print-quality issues, calibrate the product.
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ENWW 
						

							Tools for troubleshooting
The section describes the tools that can help you solve problems with your device.
Continuous self-test (HP LaserJet P2050 Series only)
The continuous self-test puts the device into a continuous printing mode without having to send jobs to
it.
1. Confirm that the product is  in a Ready state. Press OK to enter the main menu.
2. Simultaneously press and hold the down arrow 
 and Cancel button .
3. Press  OK to re-enter the main menu.
4. Navigate to the secondary service menu.
5. Select  Service Reports  and then Cont. Self-Test .
To terminate the continuous self-test, press the Cancel button 
.
Half self-test functional check
The half self-test check determines wh ich printing process is malfunctioning.
1. Print a Configuration page.
2. Press the print-cartridge-door button after the  paper advances halfway through the product (about
five seconds after the mo tor begins rotating). The leading edge of the paper should have advanced
past the print cartridge.
3. Remove the print cartridge.
4. Open the print cartridge drum shield to view the  drum surface. If a dark and distinct toner image is
present on the drum surface, assume that the firs t two functions of the electrophotographic process
are functioning (image formation and development).  Troubleshoot the failure as a transfer or fusing
problem.
If there is no image on the photosen sitive drum, perform these checks:
1. Make sure you removed the entire length of the sealing tape from the print cartridge before you
installed the cartridge.
2. Perform a drum rotation functional check to make sure that the drum is rotating.
3. Perform a high-voltage contacts check.
Drum rotation functional check 
The photosensitive drum, located in the print cartridge, must rotate for the print process to work. The
photosensitive drum receives its dr ive from the main drive assembly.
NOTE:This test is especially important if  refilled print cartridges have been used.
1.Open the print-cartridge door.
2. Remove the print cartridge.
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							3.Mark the drive gear on the cartridge with a felt -tipped marker. Note the position of the mark.
4. Replace the print cartridge and close the print-ca rtridge door. The startup sequence should rotate
the drum enough to move the mark.
5. Open the print-cartridge door and inspect the gear th at was marked in step 3. Verify that the mark
moved.
If the mark did not move, inspect the main drive assembly  to make sure that it is meshing with the print
cartridge gears. If the drive gears appear function al and the drum does not move, replace the print
cartridge. See 
Print cartridge on page 102.
Heating element check
Paper passes between the heating element and a soft pressure roller to fuse toner to the paper.
1. Unplug the product for  at least ten minutes.
2. Verify that the thermistor connector is seat ed into both the product chassis and the ECU.
3. Remove the heating element connector from the E CU. To measure the continuity of the heating
element, measure the resistance between the two pins at the end of the cable.
NOTE: Normal resistance is 25 ohms +/- 10 ohms  for the 110 V product and 80 ohms +/- 20 ohms
for the 220 V product.
If no resistance is measured, replace the fuser. See Fuser on page 158 .
4. Remove the thermistor connector, and then meas ure the resistance between J206 pins one and
two and between J206 pins three and four.
NOTE: Normal resistance between both pairs of pins  is 370K ohms +/- 50K ohms at 20° C (68° F).
5.If no resistance is measured, replace the fuser. See Fuser on page 158,
High-voltage contacts check
The high-voltage contacts in the product must have a good connection with the contacts on the print
cartridge to provide the necessary voltage s for the electrophotographic processes.
Checking the print cartridge contacts  
When the product is turned on, high voltage is placed on the developer roller of the print cartridge. If the
antenna does not detect this voltage, the product displays an  Install Black Cartridge message. Remove
the print cartridge and visually inspect the three conn ection points on the ends of the print cartridge:
primary charging contact (callout 1), developer roller  contact (callout 2), and antenna contact (callout 3).
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							If one is dirty or corroded, clean the connection with isopropyl alcohol. If one is damaged, replace the
print cartridge. See 
Print cartridge on page 102.
Figure 7-1   High-voltage contact poin ts (on the print cartridge)
2
1
3
Figure 7-2  High-voltage contact points (on the product)
2
3
1
CAUTION: After removing the print cartridge, handle it only on the ends.
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							Component locations
NOTE:Control-panel messages appear on HP LaserJet P2050 Series Printers only.
Figure 7-3  Components on the left side of the product
23
1
7
65
4
Table 7-2   Left-side components
ReferenceComponentDescriptionIf disconnected or blocked
1Formatter  
2J2Connector to control panelBlank display
3J1FFC to laser drive PCA 
4SW301Cartridge door switchControl-panel message:  Door
open appears.
5SL1Tray 1 pickup solenoid (J4)Control-panel message:  Jam in
Tray 1  appears.
6J3Connector to Tray 1 pickup
solenoid 
7 J7 FFC to engine controller  
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							Figure 7-4  Components on the right side of the product
12
3
4
5
Table 7-3  Right-side components
ReferenceComponentDescriptionIf disconnected or blocked
1Connector PCASee Figure 7-5 Components on
the connector PCA on page 198
for more information.
 
2FM1Main fanControl-panel message:  57 Fan
error  appears.
Fan rotates about 30 seconds
after being turned on.
3Paper feeder connectorConnector to optional Tray 3 
4SL2Tray 2 solenoid (J1104)Control-panel message:  Jam in
Tray 2 appears.
5 SW1001 Power switch  
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							Figure 7-5  Components on the connector PCA
1
2
3
4
Table 7-4  Connector PCA components
ReferenceComponentDescription
1J1101Duplex reverse solenoid (SL3)
2J1103Connector to scanner motor
3J1105Connector to main cooling fan
4 J1104 Connector to Tray 2 solenoid (SL2)
Figure 7-6  Components on the rear side of the product
12
3
4
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