HP Laserjet 5 Service Manual
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7 Troubleshooting Contents General Troubleshooting Flowchart . . . . . . . . . . . . . . . . . . . . . . . 7-3 Paper Path and Components . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5 DC Controller Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6 Printer Error Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7 Priority of Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7 Printer Status Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8 Service and Error Messages . . . . . . . . . . . . . . . . . . . . . . . . 7-10 Image Formation Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 7-13 Check the Toner Cartridge . . . . . . . . . . . . . . . . . . . . . . . . . 7-13 Image Defect Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 7-14 Troubleshooting Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21 Engine Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21 Half-Self Test Functional Check . . . . . . . . . . . . . . . . . . . . . . 7-22 Drum Rotation Functional Check . . . . . . . . . . . . . . . . . . . . . 7-23 High-Voltage Power Supply Check . . . . . . . . . . . . . . . . . . . . 7-24 Paper Curl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-26 Troubleshooting Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27 Paper Path Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27 Repetitive Image Defect Ruler . . . . . . . . . . . . . . . . . . . . . . . 7-28 Main Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-29 Troubleshooting 7-1
General Troubleshooting Flowchart When the AC power isfirst appliedto the printer: ·Both the printer motor and the laser/scanner motor rotate for 6 seconds. ·All of the LEDs illuminate for one second; the “Ready” LED will illuminate after 3 seconds. Ifno errormessage is displayed, the Printer Door is firmly closed, and the toner cartridge is installed, but the motor does NOT rotate when AC power is applied to the printer: 1Verify that AC power is present at the input power receptacle and that the power cord is firmly inserted into the printer. 2Verify that FU102 is not open. (See Figure 7-2.) 3Verify that motor connector J1 is seated into J401 of the DC Controller. (See Figure 7-2.) 4Verify that the motor is correctly mounted to the printer chassis. 5If all of these conditions are correct, replace the DC Controller PCA and/or the motor. If the Control Panel is not functional: 1Verify that the Control Panel connector J9 is seated into both the Control Panel and the Formatter PCA at J3. (See Figure 7-2.) 2Verify that the Formatter PCA is firmly seated into the DC Controller PCA. 3Perform an Print Engine Test. (See Figure 7-4.) 4If the engine test is successful, replace the Control Panel first, then, if necessary, the Formatter PCA. 5If the engine test is not successful, replace the DC Controller PCA. If the control panel displays an error, refer to the appropriate section in this chapter to correct the error. Continued on following page START AC Power is applied to the printer Does the Printer Motor rotate for about 6 seconds ? Is the Front Panel functional ?No Yes No Yes Is an Error displayed ? NoYes 7 Troubleshooting Troubleshooting 7-3
General Troubleshooting Flowchart (continued) Refer to the section “Image Formation Troubleshooting,” later in this chapter. If the engine test produces a clear print image, yet a Self Test is not generated by initiating the Control Panel self-test procedure, replace the Formatter PCA. Perform an Engine Test Is the Engine Test image being printed clearly ? Perform a Front Panel Self Test Is the Self Test image being printed clearly ?No Yes No EXIT Yes 7-4 Troubleshooting
Paper Path and Components Paper Path and Components PS201PS203PS202 SL1MotorFeed Roller Feed Sub Roller Pick-up Roller Paper Registration SensorPaper Out Sensor Paper Pick-up Solenoid Photo- sensitive Drum Transfer Roller Fuser Paper Exit Sensor Fusing Unit Delivery Roller Face-up DeliveryDeflector Face-down Delivery Face-down Delivery RollerManual Input SlotPaper Input Bin DC Controller PCA PAPER DELIVERY SENSOR signal (POSNS) MOTOR DRIVE signal (MA, /MA, MB, /MB) PAPER PICK-UP SENSOR signal (PISNS) PICK-UP SOLENOID DRIVE signal (CPUD) PAPER-OUT SENSOR signal (PAPERSNS) Figure 7-1 7 Troubleshooting Troubleshooting 7-5
DC Controller Diagram DC Controller PCA Components J3Control Panel Connector (Formatter PCA)J202Paper Registration and Paper-Out Photosensors (PS203 and PS202) J102Fusing AssemblyJ206Fusing Assembly (thermistor feedback) J201Formatter PCA ConnectionJ207Scanner Motor J204Paper Pickup Solenoid (SL1)J208Laser Driver/Beam Detect Circuitry J301Developer Bias ContactJ209Door Open/No Toner Cartridge Photosensor (PS204) (HP LaserJet 5L only) J302Transfer Roller ContactJ401Motor J304Primary Roller ContactFU101 SW101+12A Vdc Shutoff SwitchFU102110 volt only SW201Engine Test Print SwitchINL101Input Power Receptacle PS201Fusing Assembly Exit Photosensor Figure 7-2 7-6 Troubleshooting
Printer Error Troubleshooting Information regarding printer status is conveyed by two methods: 1) the printer’s Control Panel lights and 2) feedback through the bi-directional I/O that displays at the PC. The basic method of determining error messages uses patterns of lights on the Control Panel LED. Printer messages are categorized into two basic types: ·Status Messages ·Service and Error Messages NoteBefore troubleshooting the printer, cycle the power to the printer to see if the error persists. Priority of Errors Each error has a priority in relation to the others. If there is more than one error condition at the same time, the highest priority error will be displayed. The priority of errors is: 1Service Errors 2Door Open/No Toner Cartridge 3Paper Jam 4Paper Out 5Memory Error 6Manual Feed 7 Troubleshooting Troubleshooting 7-7
Printer Status Messages The following table lists printer LED messages and their meanings and describes recommended actions. For more information on the Front Panel layout, refer to “Using the Control Panel” in Chapter 3, “Installation and Configuration.” LEDs Description Recommended Action Paper Out Error. Door Open or No EP Cartridge. Paper Jam.Add paper. Close the printer door and/or verify that the EP cartridge is installed. Clear paper jam. If you have completed these recommended actions and the error persists, see Table 7-3. Memory Error. There is either too much data or the data is too complex.1. Turn Page Protection on within your software application or Windows. 2. Reduce the complexity of the print job. 3. Reduce resolution to 300 dpi within your software application or Windows. 4. Add optional memory to the printer. 5. Make sure Enhanced I/O is on Auto Mode (PCL mode) and resend print job. (See Chapter 3, “PCL Printer Settings.) 6. If the Auto-Continue variable is on within PJL, the printer will continue printing after 10 seconds. 7. If the Auto-Continue variable is off within PJL, you need to press the Front Panel Button to continue printing. Incompatible Memory Card. Remove the incompatible memory card and replace it with a 1, 2, 4, or 8 Mb, 70 nsec. or faster memory card. (See Chapter 8 for memory card part numbers.) Manual Feed. The printer is waiting for you to add a piece of paper to the single sheet input slot.1. Make sure the correct paper is loaded into the printer. (See your HP LaserJet 5L User’s Manualor theHP LaserJet Printer Family Paper Specifications Guidefor more information.) 2. Press and release the Front Panel Button. 3. Turn off manual feed within your software application if you do not wish the printer to pause between sheets. Table 7-1Printer Status Messages (1 of 2) 7-8 Troubleshooting
Occasionally you may add paper, close the printer door, add the toner cartridge, and clear a paper jam, only to find that the printer still displays an error message. If this happens, troubleshoot using Table 7-3 below. NoteIf the error appears and persists only after you attempt to print a page, verify that the motor is functioning. (See “Printing an Engine Test” later in this chapter.) LEDs Description Recommended Action Sleep ModeIf the printer’s LEDs remain off: 1. The printer is in Sleep Mode. Press the Front Panel Button or open the EP Door. 2. Power is not supplied to the printer. Check power cord connections and the power source. 3. Print an engine test to determine if the print engine is functional. If the test is successful, replace the Formatter PCA. 4. See the General Troubleshooting Flowchart earlier in this chapter. Table 7-2Printer Status Messages (Continued 2 of 2) This error will persist if any of the three paper movement photosensors (PS201, PS202, and PS203) and/or their flags are not functional. 1. Verify that all three photosensor flags are not blocked and move freely. (See Figure 7-1 to identify photosensor flag locations.) ·Paper Out Flag (PS202) (See Figure 5-6.) ·Paper Registration Flag (PS203) (See Figure 5-6.) ·Exit Sensor Flag (PS201) (See Figure 6-18.) 2. Verify that all connectors are firmly seated. (See Figure 7-2 to identify connector locations on the DC controller.) ·Door closed/EP Cartridge Photosensor connector (5L only) ·Paper-Out and Registration Photosensor Connector (See Figure 5-6.) Note: There is no connector for the Exit Photosensor (PS201) since it is located on the DC Controller PCA. This flag is located beneath the Fusing Assembly. (Refer to Figure 6-18.) If all of the flags move freely and all of the connectors are correctly seated, yet the error persists, replace the DC Controller PCA. Table 7-3Unclearable Error 7 Troubleshooting Troubleshooting 7-9