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Combined Service
Manual
HP LaserJet 4 / 4M
(C2001A / C2021A)
HP LaserJet 4 Plus /
4M Plus
(C2037A / C2039A)
HP LaserJet 5 / 5M
/5N
(C3916A/C3917A/
C3952A)
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© Copyright Warranty WARNING Hewlett-Packard The information Electrical Shock Company 1996 contained in this Hazard document is subject to To avoid electrical shock, All Rights Reserved. change without notice. use only supplied power Reproduction, adaptation, cords and connect only to or translation without Hewlett-Packard makes properly grounded prior written permission no warranty of any kind (3-hole) wall outlets. is prohibited, except as with regard to this allowed under the material, includ
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Conventions This manual uses the following conventions: Unless specifically stated otherwise, information applies to all seven printer models (LaserJet 4/4 Plus/4 M/4 M Plus/5/5 M/5 N). Most procedures are combined for all printers, except where they differ substantially. Color is used to emphasize items which are important to the material under discussion. The names of major printer parts and assemblies are Capitalized. Bold is used for emphasis, particularly in situations where italic type wou
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Contents 1 Product Information Product Family Information . . . . . . . . . . . . . . . 1-2 Identification . . . . . . . . . . . . . . . . . . . . . . . 1-3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . 1-5 HP LaserJet 4 and 4 Plus . . . . . . . . . . . . . . . . 1-5 Related Documentation . . . . . . . . . . . . . . . . . . 1-7 Safety Information . . . . . . . . . . . .
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Control Panel Keys . . . . . . . . . . . . . . . . . . . 3-2 Reset Menu . . . . . . . . . . . . . . . . . . . . . . . 3-5 Control Panel Menus . . . . . . . . . . . . . . . . . . . 3-6 Printer Features . . . . . . . . . . . . . . . . . . . . . . 3-13 Page Protection (HP LaserJet 4 only) . . . . . . . . . 3-13 Resource Saving (HP LaserJet 4 Plus and 5 only) . . 3-14 I/O Buffering (HP LaserJet 4 Plus and 5 on
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Printer Drivers . . . . . . . . . . . . . . . . . . . . . . . 3-41 Install Printer Drivers and Utilities . . . . . . . . . 3-41 How to Obtain Printer Drivers . . . . . . . . . . . . . 3-41 DOS Utilities . . . . . . . . . . . . . . . . . . . . . . . . 3-42 Packing the Printer . . . . . . . . . . . . . . . . . . . 3-43 Repackaging Instructions . . . . . . . . . . . . . . 3-43 Packing Checklist .
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Removing the Transfer Roller . . . . . . . . . . . . 4-16 Replacing the Transfer Roller . . . . . . . . . . . . 4-16 5 Functional Overview Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 DC Controller System . . . . . . . . . . . . . . . . . . 5-2 DC Controller Loads . . . . . . . . . . . . . . . . . . . 5-3 Serial Data Communication . . . . . . . . . . . . . . . 5-4 Solenoids
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6 Removal and Replacement Required Tools . . . . . . . . . . . . . . . . . . . . . . . . 6-2 Hardware Review . . . . . . . . . . . . . . . . . . . . . . 6-2 Removing the Covers . . . . . . . . . . . . . . . . . . . . 6-4 Right Side Cover Removal . . . . . . . . . . . . . . . . 6-4 Top Cover Removal . . . . . . . . . . . . . . . . . . . 6-5 Left Side Cover Removal . . . . . . . . . . . .
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Removing the High Voltage Contact Assembly and Feed Guide Assembly . . . . . . . . . . . . . . . . 6-67 Replacing the High Voltage Contact Assembly/Feed Guide Assembly . . . . . . . . . . 6-68 Interconnect PCA Removal . . . . . . . . . . . . . . . 6-69 7 Troubleshooting LaserJet 5 Error Map . . . . . . . . . . . . . . . . . . . . 7-A Pre-Troubleshooting Procedures . . . . . . . . . . . . . 7-1 Preliminary Operating Checks
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Drum Rotation Functional Check . . . . . . . . . . . 7-50 High Voltage Power Supply Assembly . . . . . . . . 7-51 Interface Troubleshooting . . . . . . . . . . . . . . . . . 7-52 Communications Check . . . . . . . . . . . . . . . . 7-52 Test Message . . . . . . . . . . . . . . . . . . . . . . 7-52 AUTOEXEC.BAT Standard Configurations . . . . . 7-53 Parallel DOS Commands . . . . . . . . . . . . . . . 7
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Removing the Paper Guide Assembly . . . . . . . . . A-16 Removing the Paper Roller . . . . . . . . . . . . . . A-17 Removing the Control PCA . . . . . . . . . . . . . . A-20 Removing the Power PCA . . . . . . . . . . . . . . . A-22 Removing the Holding Tray Center Paper Guide . . . A-23 Removing the Holding Tray Belt . . . . . . . . . . . A-24 Removing the Holding Tray Paper Sensor . . . . . . A-26 Removing the Switchback Assemb
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To Print Using the Infrared Port . . . . . . . . . . . . B-36 Troubleshooting IR Printing Problems . . . . . . . . B-38 Infrared Port Not Responding . . . . . . . . . . . . . B-41 Contents-9
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Contents-10
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1 Product Information Table 1-1 Printer Features Features HP LJ 4 HP LJ 4M HP LJ 4 Plus HP LJ4M Plus Model C2001A C2021A C2037A C2039A Printer Speed 8 ppm 8 ppm 12 ppm 12 ppm Resolution 300/600 dpi 300/600 dpi 300/600 dpi 300/600 dpi Expandable I/O Buffer No No Yes Yes Resource Savings No No Yes Yes MEt No No Yes Yes REt Yes Yes Yes Yes Languages Enhanced PCL5 Enhanced PCL5, Enhanced PCL5 Enhanced PCL5, Postscript Level 2 Postscript Level 2 PostScript Upgradeable C2080A* N/A C3129A* N/A Resident
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Product Family Information The model HP C2021A is identical to the model HP C2001A from a hardware standpoint, as is the model HP C2039A to the model HP C2037A. The models HP C2021A and C2039A printers include the following features: • PostScript Level 2 SIMM • AppleTalk MIO Card • 4 MBytes of RAM In every instance the repair procedures for all products are similar. Some LaserJet 4 accessories are compatible with the LaserJet 4 Plus and some are not. The compatibility chart below may be used whe
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Identification The model number is on a label placed on the outside, rear cover of the printer. The model number (C2001A, C2021A, C2037A or C2039A) is found at the top of the label. The model number is the base number for all printers. The serial number contains information about the printer Country of Origin. The serial number Alpha section refers to the Country of Origin, the Revision Level and the Production Code. The Numeric section refers to the production number of the printer. See t
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Figure 1-2 Printer Identification Label for the HP LaserJet 4/4M 1-4 Product Information
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Specifications HP LaserJet 4 and 4 Plus Table 1-3 Printer Dimensions Dimension HP LaserJet 4/4M HP LaserJet 4 Plus (C2001A/C2021A) HP LaserJet 4M Plus (C2037A/C2039A) Width 16.4 in (416 mm) 16.4 in (416 mm) Depth 15.9 in (403 mm) 15.9 in (403 mm) Height 11.7 in (297 mm) 11.7 in (297 mm) Weight (with toner cartridge) 37 lbs. (18.3 kg) 37 lbs. (18.3 kg) Table 1-4 Power Specifications Watts (typical) Volts Freq 4/4M 4 Plus/4M Plus printing = 195 printing = 300 100 Vac ± 10% 50/60 Hz ± 2 Hz standby
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Table 1-6 Electrical Specifications Status 100/115 V 220/240 V 4/4M 4 Plus/4M 4/4M 4 Plus/4M Plus Plus Product Rating 6.4 amps 7.8 amps 3.1 amps 4.0 amps Peak Inrush Current 22 amps 22 amps 22 amps 22 amps 25% Decay Time 13 msec 18 msec 11 msec 11 msec Peak Fuser Current 38 amps 51 amps 17 amps 22 amps Return-to Average Time 200 msec 200 msec 200 msec 200 msec Table 1-5 Environmental Specifications Operating Environment Temperature: 10° C to 32.5° C (50° F to 9
