HP Laserjet 4 Manual
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Message Displayed Meaning W1 IMAGE ADAPT MEMORY LOW, PAGE SIMPLIFIEDThe printer received a graphics print file that was too complex to print at the requested resolution. The printer automatically processed the file in the highest resolution possible with the memory installed. Add additional memory to print the file at full resolution. Check the printout for loss of data or print quality. W2 INVALID PERS REQUESTED LANGUAGE NOT AVAILABLEThe job was not printed because the requested personality, such as PostScript, was not installed. Install the language in which the files are sent, together with enough memory to support that language. W3 JOB ABORTED INSUFFICIENT MEMORY JOB CLEAREDThe printer was forced to abort the print job because there was not enough installed memory to support the printer language used. W4 JOB 300/OFF W5 JOB 300/LTR W6 JOB 300/A4 W7 JOB 300/LGLThe job was printed at 300 dpi with page protection set as specified in the message. To print the job as requested, install additional memory. W8 JOB 600/OFF W9 JOB 600/LTR W0 JOB 600/A4The job was printed at 600 dpi with page protection set as specified in the message. To print the job as requested, install additional memory. WM MEM CNFIG N/A MEMORY SETTINGS CHANGEDThe printer did not have enough memory when switched on to support the previous settings for I/O buffering and /or Resource Saving, probably because you removed a memory SIMM, added a new personality SIMM, or added the optional duplex unit. WM CHK MEM CNFIG MEMORY SETTINGS CHANGEDI/O Buffering and /or Resource Saving settings were altered when the printer was switched on because the printer did not have enough memory. This usually occurs after memory has been removed from the printer. (You can check settings by printing a self test.) WM [personality] MEM FULL [personality] MEMORY FULLThe Resource Saving memory area for the specified personality is full. Press [CONTINUE]* to continue printing (some data will be lost). The current job will print, but some resources (downloaded fonts, etc.) may not be saved. If this error occurs frequently, you may need to adjust Resource Saving settings. *Press Go on the LJ5. Table 7-2 Clearable Warning Messages Troubleshooting 7-11
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Printer Message Troubleshooting Procedures When the following procedures require removing and replacing an assembly or PCA, refer to the applicable section in Chapter 6 for instructions. Blank Display Checks Action Is the power on? 1. 2.Check the ON/OFF switch and verify the power is plugged in. Press a Control Panel key to verify problem still exists. Is the fan working? 1. 2.If the fan is working, check the cabling to the Control Panel. If the cabling is good, replace the Formatter first, then the Control Panel. If the fan is NOT working, measure the DC voltage levels (refer to Table 7-39). If the voltage levels are good from the power supply to the DC Controller and the fan is not working, replace the DC Controller. If the voltage levels are not present at TB1, replace the DC Power Supply. Table 7-3Blank Display 7-12 Troubleshooting
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MP/PC/LC (Tray 1/2/3) LOAD Message The conditions that result in MP/PC/LC LOAD or (TRAY 1/2/3) messages are: •The absence of any input tray. •The absence of media in either tray. •The tray size switches may be defective and not recognize the presence of the paper tray. The tray is sensed as the tray-identifier tabs contact one or more of the three tray identifier microswitches. •The Universal Tray paper size dial setting does not match the installed paper. The MP/PC/LC LOAD message is also generated when the user or software requests a paper size other than that installed. The Paper Sensing Arms are located in the paper input areas of the printer. During normal operation, the Paper Sensing Arm flags rest on the media installed in the paper tray. The Sensing Arm flags are attached to shafts. The opposite end of the shaft is a photointerrupter that rotates through the sensors on the Paper Control PCA. These sensors are: •PS4 Paper out-MP tray. •PS2 Paper out-PC tray. •PS6 Paper out-Lower Cassette. •PS7 Paper out-Envelope Feeder. The presence of paper in the paper tray is sensed by the paper sensor arm. When paper is in the cassette, the sensor arm rests on top of the paper in the tray. At this point, the sensors are not blocked. When the tray is empty, the arm swings through its travel. The photointerrupter attached to the paper sensor arm shaft rotates and blocks the sensor diode. Troubleshooting 7-13
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Checks Action Is media present in the tray(s). Install media. Are the proper trays fully inserted in the printer?Reseat the cassettes. Make sure each cassette is fully seated into the printer. Ensure that the Universal Paper tray selector knob setting matches the installed paper. Does the Control Panel’s or application’s Paper size setting match the tray being used?Correct the setting to match tray. Is the expected tray size being recognized by the printer?Ensure that the image is sized correctly (formatted) for the paper size selected. Proceed to the following cassette size switches functional check. Check switches 603/4/5 if feeding from the PC tray (Tray 1). Check switches 851/2/3 if feeding from the Lower Cassette. see Figures 7-14 and 7-15 for locations.) Are any of the tray identifier tabs broken on either PC (Tray 1) or LC (Tray 2) paper tray?Inspect the tray for damage. If damaged, replace the tray. Table 7-4“MP/PC/LC (Tray 1/2/3) LOAD” Message Checks 7-14 Troubleshooting
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Cassette Size Switches (SW603, SW604, SW605) Functional Check Before beginning this test, remove the Lower Cassette Base and the Envelope Feeder. Also, PS2 (PC or Tray 2 Paper Out sensor) must be engaged for this test to be performed reliably. Push PS2 up towards the rear of the printer with your hand. 1Power ON the printer with the PC tray removed. Wait for the PC LOAD XXX message. Set PAPER=LETTER in the Printing Menu using the Control Panel. 2With PS2 engaged, press and hold the lower and upper paper size switches (refer to Table 7-5). The display should read 00 READY. If the display does not change, the switches are defective. Inspect the switch activating mechanism and/or replace the Paper Control PCA. 3Repeat the test, this time setting the paper size to legal (PAPER=LEGAL) and pressing the top two switches. If the printer responds with 00 READY, all three switches have been tested and verified. NoteThe LaserJet 5 printer will require you to set the paper size, followed by a self test to generate the equivalent TRAY 2 LOAD message. Use the Job Cancel key between tests to cancel the Self Test printout. Figure 7-1 PC Tray Size Sensing Microswitches Location Troubleshooting 7-15
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Paper Size Sensing Lower Cassette The operator must set the appropriate paper size for the Lower Cassette using a dial which, in turn, activates switches on the cassette base. This setting is sent to the DC Controller on the serial data bus (SLI). The printer posts a 41.3 SERVICE error if the media is different from that selected with the switch. To verify proper operation of the LC (Tray 3) switches, lock out the MP (Tray 1) and PC (Tray 2) trays (in the Config Menu) and perform the same test with Lower Cassette switches as was done for the PC tray (Tray 2) switches. Cassette Cassette Size Sensing Switch SW603/851 SW604/852 SW605/853 Upper Middle Lower LegalON ON OFF LetterON OFF ON A4OFF OFF ON ExecutiveOFF ON ON No CassetteOFF OFF OFF Table 7-5Switch Logic for Cassette Size 7-16 Troubleshooting
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PC Empty Sensor (PS2) Functional Check 1Power on the printer with the PC tray (Tray 2) empty. 2After the 05 SELF TEST and the 02 WARMING UP cycles, the PC LOAD LETTER (or A4) or TRAY 2 EMPTY message appears. 3Add paper to the PC tray and re-install the tray. 4The display should read 02 WARMING UP, then 00 READY. If the PC LOAD or TRAY 2 EMPTY message persists, replace PS2. PS4 Check (MP Tray Empty Sensor) 1With the printer powered ON and 00 READY displayed, select the Config Menu from the Control Panel. 2Configure the MP Tray (Tray 1) as a cassette (MP TRAY=CASS or TRAY 1=CASSETTE). 3Lock out the remaining paper trays (LOCK= PC LC or LOCK TRAY= 2 3). 4Remove any paper from the MP Tray (Tray 1). The printer should display an MP LOAD [paper size] message. For the LaserJet 5 printer, run a Self Test to generate the TRAY 1 LOAD message. 5Insert paper into the MP Tray (Tray 1). If the MP LOAD (TRAY 1 LOAD) message persists (or if the load message never occurred), PS4 or the sensor flag is defective. Troubleshooting 7-17
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12 Printer Open Message The 12 PRINTER OPEN (or CLOSE PRINTER COVER) display tells the operator to close the printer’s top cover. The DC Controller detects the Printer Open condition through the position of SW601, which is located on the Paper Feed Assembly PCA . A tab underneath the top cover Door engages SW601 through a slot in the Top Cover Assembly. In addition to signaling that the top cover is open, SW601 enables the +24B VDC which controls the high voltage for the printing processes, and the AC Voltage for the Fuser Assembly. Checks Action Is the Top Cover Assembly open? Ensure the Top Cover Assembly is firmly closed, and that the protrusion that engages the switch actuator is not broken. With the top cover open, check that the switch actuator does engage the switch.Use a slim object to manually engage SW601. Listen for a definite “click” as the switch is engaged (see Figures 7-2 and 7-14). Has the Paper Control PCA on the Paper Feed Assembly been replaced?SW601 has an actuator that can be deleted during reassembly. Ensure that this actuator is installed correctly. Is the DC Controller PCA defective? Measure the 24 VDC on J201, pins 8 and 9 on the DC Controller (see Figures 7-16 and 7-17 for locations). If this 24 volts toggles as SW601 is activated, replace the DC Controller. If it does not, replace the Paper Control PCA or the cable. Also check J201-6 (DOPEN). This voltage should be 5 VDC when the printer is open, and 0 when the printer is closed. If not, replace the DC Controller PCA. Table 7-612 PRINTER OPEN Checks 7-18 Troubleshooting
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SW601 Functional Check 1Open the Top Cover Assembly. 2The message 12 PRINTER OPEN (or CLOSE PRINTER COVER) should appear. 3Close the top cover. The 02 WARMING UP message should appear. 4If the messages do not occur, check the switch actuator (see Figure 7-2, callout 1) on the top cover, and check that the plunger that covers the switch is in place (see also Figure 7-14 for switch locations). 5Replace the Paper Control PCA. Figure 7-2 Location of the Top Cover Closed (SW601) Actuator Troubleshooting 7-19
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13 PAPER JAM Message Paper jams occur when paper fails to arrive at or clear the paper path sensors in the allotted time. Paper movement is monitored primarily by two paper sensors. These are described below and illustrated in Figure 7-3). 1PS1, the Input/Registration Sensor, located in the Paper Feed Assembly. 2PS3, Exit Sensor, monitors paper in the Fuser Assembly. When troubleshooting paper jams, the door associated with the sensor must be opened and closed to clear the jam message. For instance, if PS3 (Exit Sensor) detected the paper jam, and the jam was cleared through a method other than opening the rear door, the message remains in the display until the rear door is opened and closed. Likewise, the top cover must be opened before a jam detected by PS1 is cleared. The DC Controller monitors these sensors, and detects both the leading and trailing edge of the paper to verify that the paper clears the sensors in the allotted time. If the paper does not arrive at, or clear the sensors in the allotted time, the DC Controller senses a paper jam. The paper jam information is transferred to the Formatter PCA, which displays the 13 PAPER JAM message. Note also that if PS5 (MP Tray or Tray 1) Paper End Sensor on the Sensor PCA is bad (Figure 7-3, item 3), a paper jam will be reported when paper is fed from the MP Tray (or Tray 1). Figure 7-3 PS1 and PS3 (Paper Path Sensors) & PS5 Paper End Sensor 7-20 Troubleshooting