1-10 Product Information

Toner Safety
Note Toner may stain clothing. Skin and clothing are best cleaned by removing as much toner as possible with a dry tissue, then washing with cold water. Hot water causes toner to melt and permanently fuse into clothing.
A Material Safety Data Sheet (MSDS) for the toner cartridge used in the HP printers, is available through Hewlett-Packard by either mail or fax. Mail. To obtain a MSDS for the 92298A LaserJet Toner Imaging System through the mail, call the Customer Information Center (CIC) at 1-800-752-0900 between 6 A.M. and 5 P.M. Pacific Standard Time. Fax. To obtain a MSDS for the 92298A LaserJet Toner Imaging System by fax, call the HP FIRST number at (800) 333-1917 (U.S. and Canada) and enter document number 1512. Note To get documents from HP FIRST by fax, you must use a Group 3 (touchtone) fax machine.

Ozone Statement

These printers do not use high voltage corona wires in the electro-photographic process, and therefore generate no measurable ozone gas (O3). They use a charging roller in the toner cartridge and a charging transfer roller in the printer.

Product Information 1-11

Doing Business with HP
Technical Assistance HP ASAP 1-800-333-1917 (U.S.)
HP ASAP (Automated Support Access Program) provides free technical support information 24 hours a day, 7 days a week. The ASAP system includes HP FIRST and HP AUDIO-TIPS, both explained below. The ASAP service requires a touch-tone phone.

HP FIRST

HP FIRST (Fax Information Retrieval Support Technology) is a phone-in fax service providing technical information for HP LaserJet users as well as service personnel. Receiving a fax requires a group 3 facsimile machine or fax card. Service-related information includes:
Service notes (HP Authorized Dealers) (password = 737842). Application notes. Product Data Sheets. Material Safety Data Sheets (MSDS). Typeface and accessory information. Printer support software information. Toner information. Driver request form and Software Matrix.
HP FIRST, U.S. Call the HP ASAP system (1-800-333-1917) and follow the voice prompts to enter HP FIRST. HP FIRST, Europe Call HP FIRST at one of the following numbers: U.K., 0-800-96-02-71 Netherlands, 06-02-22-420 Belgium (Dutch), 0800-1-1906 Germany, 0130-8100-61 Switzerland (German), 155-1527 Austria, 0660-8128 For English service outside the above countries, (31) 20-681-5792

1-12 Product Information

0K and up

Table 3-7 Item

HIGH SPEED

Parallel Menu Items Options

YES* NO

Sets parallel interface to run at a higher data rate. Sets the parallel interface to run at a slower data rate.
ADV FNCTNS *indicates factory default.

ON* OFF

Configuration 3-11

Table 3-8 Item

SERIAL PACING
Serial Menu Items Options
RS-232* RS-422 (HP LJ 4 only) DTR/DSR* XON/XOFF
Use the RS-422 when a longer cable is needed. Use if the computer requires hardware flow control. Use if the computer requires software flow control. Tells how fast information will be transferred from the computer to the printer. Appears when pacing is set to XON/XOFF. Printer sends XON when printer is put on line or when sufficient buffer space is available. Printer sends one XON when it can accept more data or when it is put on line. Pin 20 is high. Pin 20 is low.

BAUD RATE

9600* 300 to 57600

ROBUST XON ON* OFF

DTR POLARITY *indicates factory default.

HI* LO

Table 3-9 Item
SELF TEST CONT SELF TEST PCL TYPE LIST PCL DEMO PAGE
Test Menu Items Explanation
With SELF TEST displayed, press [ENTER] to run a self test. Prints continuous self test pages until [ON LINE] or [SHIFT] + [CONTINUE] are pressed. Prints a list of typefaces and bitmapped fonts in your printer. Prints a page that illustrates the printer features.
*indicates factory default.

3-12 Configuration

Some of the important features of the HP LaserJet 4, 4 Plus, and LaserJet 5 printers are described below.
Page Protection (HP LaserJet 4 only)
Note The default is PAGE PROTECT=OFF*. Unless you frequently get 21 PRINT OVERRUN messages, you may not need to set a value for page protection.
Page protection reserves additional memory for the page image process, allowing the printer to create an entire page image in memory before paper starts through the printer. The memory required for page protection is dependent upon the resolution selected: a 600-dpi page can take 4 times as much memory as a 300-dpi page. If you use page protection, set it for the size you expect to use most often. Be sure you have sufficient installed memory for the option you select. Complex graphics and PostScript applications also require more memory than is included in the standard printer configuration. Note Unlike earlier HP LaserJet printers, page protection and resolution can be set regardless of memory installed in the printer. Be aware that setting page protection ON will decrease the amount of memory available for other memory dependent features.

Configuration 3-13

Resource Saving (HP LaserJet 4 Plus and 5 only)

3-18 Configuration

5 Under the Extras menu, select Set Printer Password. On
the Printer Security screen, enter the new password (numeric values can be set from 0 to 65535), and click on the OK button.
HP JetAdmin Utility (Novell Networks) 1 Run JETADMIN. 2 Select the printer you want to configure. It is listed under its JetDirect Interface Name which appears on the self test page/configuration plot. 3 Select Configuration. The Printer I/O Configuration screen appears. 4 Select Advance. The Advance Settings screen appears. 5 Select Lock Printer Control Panel. 6 Click on Select. (the Advanced: Printer Security screen appears), then click on the ON button. 7 Click the OK button. ASCII PJL Escape Sequence Password: send this sequence to the printer from any ASCII editor: %-12345X@PJL JOB @PJL DEFAULT PASSWORD=[numeric password (0 to 65535)] @PJL EOJ E C %-12345X CPLOCK: to turn on or off, assuming that a password has NOT been set, send the following ASCII sequence to the printer: %-12345X@PJL JOB @PJL DEFAULT CPLOCK=ON [OFF] @PJL EOJ E C %-12345X If a password HAS been set, send the following ASCII sequence to the printer to turn CPLOCK on or off.: %-12345X@PJL JOB PASSWORD=(numeric password) @PJL DEFAULT CPLOCK=ON(OFF) @PJL EOJ E C %-12345X

E C E C E C

Configuration 3-19

Service Mode

(Refer to Appendix B for LaserJet 5 information.) The Service Mode should be used only by authorized service personnel. The following can be executed while in the Service Mode:
Print a Service Mode Self Test. Verify the Page Count, (the page count also is displayed on the Set the Page Count. Set the Cold Reset Default (This sets the factory default paper
size. Use when replacing non-U.S. Formatters). Set the Diagnostic Functions ON or OFF (for software developers use only). Demo Page=On/Off. Removes the Demo Page option from the self test menu. BIG Data=On/Off (HP LaserJet 4 Plus only). Setting BIG Data to ON increases the size of the printers status Readback Buffer. standard self test).

Figure 4-2

Example of a page having approximately 5 Percent Toner Coverage
Saving Toner with EconoMode (HP LaserJet 4 Plus and 5 Only)
Toner cartridge life can be extended dramatically by using the EconoMode printing feature of the printer. EconoMode can be turned on or off via the printer control panel, through HPs Remote Control Panel or through a software application with the appropriate printer driver. Note EconoMode is recommended in portrait orientation only. Some software applications may refer to this as draft mode. Software settings always override control panel selections.
Storing the Toner Cartridge
Do not remove the toner cartridge from its packaging until you are ready to use it. The shelf life of an unopened cartridge package is approximately years of storage including usage; the maximum shelf life of an opened cartridge package is approximately six months including usage. Use the toner cartridge before the expiration date which is printed on its shipping box. Always store cartridges:
As specified on the shipping box, or horizontally (flat) if
removed from the box. In a normal office environment (for example, a location with regulated temperature and humidity). Away from direct sunlight or other strong light.
4-6 Preventive Maintenance
Installing the Toner Cartridge
The toner cartridge is empty and must be replaced when the toner low message cannot be cleared, as described in Clearing the 16 TONER LOW Message later in this section. To replace the toner cartridge:
1 Open the printers top cover and remove the empty toner
cartridge. Note Inside the new HP toner box is a document which explains HPs toner cartridge recycling policy. Follow the instructions to package the empty toner cartridge and return it for recycling.
2 Remove the new toner cartridge from its box and remove the

storage bag.

Figure 4-3
Removing the Toner Cartridge Sealing Tape
3 Remove the sealing tape by firmly grasping the tab on the
right side of the toner cartridge and pulling it straight out the side of the cartridge. (See Figure 4-3.) Note Pulling the toner cartridge at an angle may damage the toner cartridge seals.

Figure 4-4

Inserting the Toner Cartridge
4 Position the cartridge with the arrow pointing into the printer

as shown in Figure 4-4.

5 Insert the toner cartridge fully into the printer (press firmly). 6 Close the top cover and press [On Line] (or Go on the LJ 5) to

resume printing.

Figure 5-2

Serial Data Flow

5-4 Functional Overview

Solenoids
Solenoids are controlled by the DC Controller. Each solenoid drives a specific roller (see Table 5-1). The DC Controller outputs +24B VDC to energize the solenoids at the proper time. When either of the doors are open, the +24B VDC is removed and the solenoids are disabled. Table 5-1 Solenoid Signals Description
PC tray (Tray 2) Pickup Roller Clutch Solenoid Multi-purpose (MP) Tray (Tray 1) Pickup Roller Clutch Solenoid Lower Cassette (LC or Tray 3) Pickup Roller Clutch Solenoid

Solenoid

SL1 SL2
Paper Control PCA (J704) Paper Control PCA (J702)
Lower Cassette (J853) located in Lower Cassette Drive Assembly. See Chapter 8 for location.

Figure 5-3

Printer Solenoid and Photosensor Locations

Functional Overview 5-5

Photosensors
Photosensors, monitored by the DC Controller, are responsible for detecting the presence of paper, paper motion, and timing. (See Table 5-2.) Photosensor PS2 senses paper in the PC tray; photosensor PS4 senses paper in the MP tray. The message PC LOAD or MP LOAD is displayed when either the PC tray or the MP tray is selected as the primary tray and is out of paper. PS6 and PS7 (respectively) sense the presence of paper in the Lower Cassette and the Envelope Feeder. Paper must be loaded into the primary paper tray before printing can resume. The message PC EMPTY or MP EMPTY is displayed when either the PC tray or the MP tray is out of paper and is not selected as the primary paper tray. LC EMPTY or EE EMPTY is displayed when the Lower Cassette or the Envelope Feeder is empty. The EMPTY message is only a reminder that the paper tray is empty; it is not necessary to load paper to continue printing from another tray. The Paper Control PCA, Lower Cassette Assembly, and the Envelope Feeder communicate with the DC Controller through serial data lines. The condition of the printer engine photosensors PS2, PS4, PS5, the optional Lower Cassette PS6, and the optional Envelope Feeder PS7 is encoded into a digital logic stream and read by the DC Controller on line SLI. PS1 detects paper at the Input Feed Roller and is used in jam detection and registration. PS3 detects the presence of paper in the Fuser Assembly, and is used in jam detection. PS5 terminates laser operation when it detects the end of the sheet. This allows the printer to print images on odd-sized media fed from the MP tray without contaminating the Transfer Roller. Note The LaserJet 5 printer uses different tray designators and associated messages as follows. LJ 4 / 4 Plus MP Tray PC Tray LC Tray MP/PC/LC LOAD MP/PC/LC EMPTY Tray 1 Tray 2 Tray 3 TRAY x LOAD (x=1,2, or 3) TRAY x EMPTY (x=1,2, or 3) LJ 5

Figure 5-10

Image Writing

5-20 Functional Overview

At the beginning of each sweep (before the beam reaches the drum), the beam is reflected off the beam detect mirror. The momentary pulse of light is sent to the DC Controller, where it is converted to an electrical signal used to synchronize the output of data (VDO) for one sweep (scan line). This pulse, referred to as the Beam Detect signal (BD), is used to diagnose problems with the laser diode or scanner motor also. After the writing station, the drum surface has an invisible (latent) electrostatic image. Portions of the drum not exposed to the laser are still at the uniform negative potential (placed there by the primary charging roller), but those portions exposed to light have been discharged to ground, to form the latent electrostatic image.

Figure 5-11

Drum Signals

Functional Overview 5-21

Developing Stage
The developing station develops the latent electrostatic image into a visible image on the drum. The developing unit consists of a metallic cylinder that rotates around a fixed magnetic core inside the toner cavity. Toner is a powdery substance made of black plastic resin bound to iron particles, which is attracted to the magnetic core of the cylinder. A rubber blade brushes the toner on the developing cylinder to a uniform thickness. The toner particles obtain a negative surface charge by rubbing against the developing cylinder which is connected to a negative DC supply. The negatively charged toner is attracted to the discharged (grounded) areas of the drum exposed to laser light, and repelled from the negatively charged (non-exposed) areas. An AC potential is applied to the developing cylinder to decrease the attraction between the toner and the magnetic core of the cylinder, and to increase the repelling action of toner against the areas of the drum not exposed to laser light. This AC potential improves density and contrast.

Figure 5-12

The MP Tray (Tray 1) The PC Tray (Tray 2) The Lower Cassette (Tray 3) The Envelope Feeder
Each input has features which makes it the best choice for various applications. For instance, short media and heavy stock can be fed from the MP tray (Tray 1) because it senses media length and has a relatively straight paper path. Large print jobs can be fed reliably from the optional Lower Cassette (Tray 3). The Paper Feed Assembly contains a state machine which monitors input sensors and generates commands for the solenoids and motors on the Paper Feed Assembly. In addition, the Paper Feed Assembly communicates with the DC Controller through serial data lines. An illustration of this is M2, the Paper Feed Motor. M2 is controlled solely by the Paper Feed Assembly state machine. M2 begins rotation when the State Machine receives the correct set of conditions from its inputs and the serial data lines. M2 stops rotation when the Input Registration sensor (PS1) reports the presence of paper to the State Machine. The State Machine outputs the presence of paper to the DC Controller through the serial data line. 5-26 Functional Overview
The Paper Feed Assembly performs horizontal registration of the print media through the Oblique Rollers. As the print media passes through the Oblique Rollers, the media is moved uniformly to the left side of the print path. The movement ensures that each print image is oriented properly on the horizontal axis.

Figure 5-16

Input Paper Feed System Diagram

Functional Overview 5-27

Figure 5-17
Paper Feed Assembly (Sectional View)

Table 5-6 Part

PS1 PS2 PS3 PS4 PS5 SL1 SL2
Description Leading Edge Registration Sensor PC Tray (Tray 2) Paper Out Sensor Exit Sensor MP Tray (Tray 1) Paper Out Sensor MP Tray (Tray 1) Paper End Sensor Cassette (Tray 2) Pickup Roller Clutch Solenoid MP (Tray 1) Tray Pickup Roller Clutch Solenoid

5-28 Functional Overview

Printing from the MP Tray (Tray 1)
MP tray selection is provided by the Formatter PCA, as configured by the operators control panel or by a software application. The MP tray (Tray 1) feed systems paper motion begins when the DC Controller PCA, after receiving a PRNT signal, starts the Scanner Motor (M5) and the Main Motor (M1). When the fusing roller reaches the minimum operating temperature (183 C), the MP pickup roller clutch solenoid (SL2) is energized for 1 second, allowing the MP pickup roller to make one rotation. Clutches and solenoids work together to start and stop gears and rollers used for paper movement. The MP pickup roller then feeds a sheet of paper from the MP tray (Tray 1). The Formatter PCA sends the VDO signal to the print engine within a specific time period after the paper reaches the Input/Registration Paper Sensor (PS1). This aligns the leading edge of the toner image on the photosensitive drum with the leading edge of the paper. After the paper passes the drum and the fusing rollers, it triggers the Paper Exit Sensor (PS3). The paper then is directed to the output tray. If the paper does not reach or clear each sensor within a specified time, the microprocessor on the DC Controller PCA assumes a paper jam occurred and informs the Formatter PCA.

POWERSAVE ON PRINTING CONFIGURATION PAGE PRINTING DEMO PAGE PRINTING FLASH PAGE
PRINTING FONT LIST PROCESSING JOB

READY REMOVE DUPLEX JAM

7-B LaserJet 5 Error Map
REMOVE PAPER JAM REQUESTED LANGUAGE NOT AVAILABLE RESETTING ACTIVE I/O RESETTING ALL I/O RESTORING FACTORY SETTINGS TONER LOW TRAY 2/3 EMPTY
See 13 PAPER JAM See W2 INVALID PERS See 07 RESET See 07 RESET See 08 COLD RESET See 16 TONER LOW Indicates Tray 2 or 3 has run out of paper and has not been selected as the current jobs paper source. If the problem persists, check for a binding sensor flag or replace the appropriate sensor.
TRAY x LOAD [paper or envelope size] See xx LOAD [paper or envelope size] WARMING UP x LOAD [envelope size] x=Tray 1 or Envelope Feeder See 02 WARMING UP See xx LOAD [paper or envelope size]

LaserJet 5 Error Map 7-C

7-D LaserJet 5 Error Map

Troubleshooting

Pre-Troubleshooting Procedures
Preliminary Operating Checks
Prior to troubleshooting a specific printer problem, you should ensure that:
The printer is being maintained on a regular basis as The customer is using acceptable media as specified in the The printer is installed on a solid, level surface. The line voltage does not vary more than 10% from the The operating environment for the printer and paper is within
the temperature and humidity specifications listed in Chapter 1 of this manual. The printer is never exposed to ammonia fumes such as those produced by diazo copiers, or office cleaning materials. The printer is not exposed to direct sunlight. Non-HP components (such as refilled toner cartridges, font cartridges, and memory boards) are removed from the printer. nominal rated value as specified on the Power Rating Label. Users Manual. described in Chapter 4.

Troubleshooting 7-1

Printer Message Troubleshooting
Printer Message Summary Table
Table 7-1 is a list of all status, attendance, error, and service messages affecting the printers. The table also identifies the action required to correct the situation identified by the message. When the action requires removal and replacement of an assembly or PCA, refer to the applicable section of Chapter 6 for instructions. For general location of components, refer to Troubleshooting Aids at the end of this chapter. Table 7-1 Message
Blank Display 00 READY 00 POWERSAVE POWERSAVE ON
Printer Messages Symptoms and Recommendations
Refer to the Blank Display Table 7-3. Proceed; printer is ready to use. Printer is in Power Save Mode. Press any key to take printer out of Power Save mode. Receipt of data or an error condition will also take printer out of Power Save mode. The job will print when the fuser is warmed up (may take up to 45 seconds). Printer is off line and not able to receive data. Press On Line*. Wait until printer signals ready. The non-printing portion of Self Test is in progress. Wait for the printer to display the 00 READY message. Self Test printing. Wait for the printer to display the 00 READY message. Printing sample characters from available typefaces. Wait for the printer to display the 00 READY message. (Note: the format is different for PCL and PostScript.) Printing a Typeface List. (Note that PCL/Postscript formats are different.) Printing a Demonstration Page. (Note that PCL/Postscript formats are different.) Printing a Configuration Page. Appears only with PostScript installed in the printer.

Figure 7-21

TB 201 Voltages

Troubleshooting 7-69

7-70 Troubleshooting

Parts and Diagrams

How To Use the Parts Lists
The figures in this chapter illustrate the major subassemblies and component parts of the HP LaserJet 4/4M, LaserJet 4 Plus/ 4M Plus, and LaserJet 5/5M/5N printers. When ordering an electrical part, pay special attention that the part chosen has the correct voltage rating for the machine under repair. Part numbers with no indicator in the Notes column are stocked and can be ordered through Hewlett-Packards Support Materials Organization (SMO). Parts marked with an S in the Notes column are special order parts which can be ordered through SMO but may have an eight-week lead time. An alphanumeric index referencing all part numbers is included at the end of this chapter (see Parts List, page 8-40). Note Not all parts are orderable. The parts listed are the only orderable parts. Parts that have no reference designator or part number are not field-replaceable and cannot be ordered through SMO.
Figures referred to in the tables are placed before the table throughout the chapter. Accessory Parts are listed on 8-33. This list includes such items as the MIO and SIMM cards.

Parts and Diagrams 8-1

Parts Lists and Illustrations

Figure 8-1a

Field-Replaceable Assemblies (1 of 2)

8-2 Parts and Diagrams

Figure 8-1b
Field-Replaceable Assemblies ( 2 of 2)

Parts and Diagrams 8-3

Table 8-1
Part # RG5-0454-000CN RG5-0879-130CN RG5-0455-000CN RG5-0880-130CN RH7-1151-000CN RH7-1169-000CN RG5-0451-000CN RG5-0877-000CN RG5-2195-000CN RB1-2119-000CN RB1-7907-000CN RG5-0478-000CN RG5-1076-000CN RG5-2238-000CN RG5-0512-000CN RG5-0514-000CN RG5-0469-000CN RG5-0475-060CN RG5-0456-000CN RG5-0886-000C RG5-2189-000CN RG5-0511-000CN RG5-0966-030CN RG5-0472-000CN RG5-0888-000CN RG5-2199-000CN
Field-Replaceable Assemblies
Ref 1 Exchng # C2001-69003 C2037-69001 C2001-69004 C2037-69002 Description Fusing Assy (100/110V) LaserJet 4 LaserJet 4 Plus/5 Fusing Assy (220/240V) LaserJet 4 LaserJet 4 Plus/5 Main Motor LaserJet 4 LaserJet 4 Plus/5 C2001-69005 C2037-69003 C3916-69005 Paper Feed Assembly LaserJet 4 LaserJet 4 Plus LaserJet 5 Main Switch Assy LJ 4 & 4+ LJ 5 C2001-69010 C2037-69005 Display Assy w/o overlay LaserJet 4 LaserJet 4 Plus LaserJet 5 Paper Control PCA Sensor PCA Transfer Guide Assembly Paper Output Sensor Assy Paper Output Assembly LaserJet 4 LaserJet 4 Plus LaserJet 5 C2001-69002 C2037-69004 DC Controller PCA LaserJet 4 LaserJet 4 Plus/5 MP Tray (Tray 1) LaserJet 4 LaserJet 4 Plus LaserJet 5 Fig. # 8-10

Screw, w/ washer

RG5-0457-000CN RG5-0876-050CN
Drive Gear Assy Drive Gear Cover Screw w/ washer, M3X29.5
15A RB1-2318-000CN RB1-3481-020CN 16 XA9-0668-000CN

8-16 Parts and Diagrams

Figure 8-4c
Internal Components (3 of 4)

Parts and Diagrams 8-17

Table 8-4c
Internal Components (Section 3)
Part # RS5-8219-000CN RB1-2357-000-CN RB1-7897-000CN XA9-0584-000CN XA9-0670-000CN XA9-0574-000CN RF5-0471-000CN RF5-0746-000CN RF5-1647-000CN RF5-0355-000CN RB1-2312-000CN RB1-2313-000CN RB1-2341-000CN RB1-2343-000CN RF5-0739-000CN RF5-1654-000CN RB1-2363-000CN XA9-0400-000CN XA9-0704-000CN RB1-2365-000CN RB1-3493-000CN RB1-2366-000CN RB1-2366-000CN RB1-3496-000CN RB1-7898-000CN RB1-2337-000CN RB1-3497-000CN RB1-2338-000CN XB6-7300-409CN XA9-0670-000CN XA9-0617-000CN XA9-0267-000CN
Notes S LJ4/4+ LJ5 LJ4 LJ4+/5 Label
Cover, Connector Screw, w/ spring washer Screw, 5mm hex head
LJ4 LJ4+ LJ5 LJ4 LJ4 LJ4 S LJ4 LJ4+ LJ5 S LJ4 LJ4+/5 LJ4 LJ4+/5 S LJ4 LJ4+ LJ5 LJ4 LJ4+ S LJ4 LJ4+/5 LJ4 LJ4+/5

Plate, Shield

7 7A 7B 8 9
Panel, I/O Sheet Sheet Guide, I/O Option, (LJ4 only) Cover, SIMM Board
Cover, Edge, (LJ4 only) Lock, Nut Plate, PCA Holding Cover, Option board Shield, Font Cover Shield, Cover Guide, Font Cartridge Plate, Shield, (LJ4 only) Screw, M3x4 Screw, M3x6 Screw, M3x6

8-18 Parts and Diagrams

Ref 22
Part # C2002-67901 C2038-60004 C3919-67901 C2002-69001 C2038-69004 C3919-69001 RB1-3494-000CN RB1-7892-000CN
Notes LJ4 LJ4+ LJ5 LJ4 LJ4+ LJ5 LJ4+ LJ5
Description Formatter PCA

Formatter PCA (Exchange)

Plate, Reinforcement

Parts and Diagrams 8-19

Figure 8-4d
Internal Components (4 of 4)

8-20 Parts and Diagrams

Table 8-4d

Ref 13

Internal Components (Section 4)
Part # Notes Guide, Feeder Roller, Guides (6) Hex Head Screw LJ4/4+ Transfer Block Assy LJ5 Block, Connecting LJ4 Cable, D.C. Controller /Interconnect PCA LJ4+/5 Connector PCA Assy LJ4 High Voltage PCA LJ4+/5 LJ4 High Voltage PCA (exchng) LJ4+/5 Cover, High Voltage Holder, Paper, Front Holder, Paper, Rear Roller, Transfer Description
RB1-2236-000CN RB1-2253-000CN XA9-0623-000CN RG5-0468-000CN RG5-2192-000CN RB1-2251-000CN RG5-0521-000CN RG5-0979-000CN RG5-0515-000CN RG5-0513-000CN RG5-0969-040CN C2001-69009 C2037-69009 RB1-2226-000CN RF5-0369-040CN RB1-2259-040CN RF5-0349-000CN

Part # RG5-0531-000CN RG5-0531-000CN RG5-2499-000CN RG6-2499-000CN C2001-69008 C2037-69007 RG5-0553-000CN RG5-2500-000CN RG1-3508-000CN RG1-3570-000CN RF5-0533-000CN RF5-0733-000CN RF5-1645-000CN RB1-2335-000CN RB1-3475-000CN RB1-7890-000CN RS5-2219-000CN RS5-2571-000CN RB1-2354-000CN RS5-2219-000CN RB1-2346-000CN RB1-3470-000CN RF5-1644-000CN RB1-7889-000CN FB1-0253-000CN RA1-7584-000CN RB1-2352-000CN RB1-7896-000CN RB1-2182-000CN RB1-2616-000CN RB1-2253-000CN RB1-2264-000CN
Fig. # 8-1a 8-1a 8-1a 8-1a 8-1a 8-1a 8-1a 8-1a
Printer 4+/4+ 4+/4+ 4 4+ 4+ 5
8-2 8-2 8-2 8-2 8-2 8-2 8-2 8-2 8-2 8-2 8-2 8-2 8-2 8-2 8-10 8-10 8-4b 8-4b 8-6a 8-11 8-4d 8-10
4 4+ 5 4/4+ 4+/4/4+ 4+/4+ 4+/4/4+ 5 4/4+/5 4/4+/5 4/4+/5 4

Parts and Diagrams 8-53

Description Roller, Lower Roller, Lower Delivery Roller, Lower Delivery Roller, MP Tray Pickup Roller, MP Tray Pickup Roller, Pickup Roller, Pickup Roller, Pickup Roller, Pickup Roller, Pickup Roller, Pickup Roller, Transfer Roller, Upper Roller, Upper Roller, Upper Delivery Roller, Upper Delivery Rollers, Delivery, 4 ea. Screw w/Washer, 4 ea. Screw w/Washer, M3x29.5 Screw with Washer (M3x8) (4) Screw, 5mm hex head Screw, M3x3 Screw, M3x4 Screw, M3x4 Screw, M3x6 Screw, M3x6 Screw, M3x6 Screw, M3x6 Screw, M3x8 Screw, Shoulder (M3) Screw, Shoulder w/Washer (M3) Screw, Shoulder w/Washer (M3)
Part # RB1-3517-030CN RF5-0438-000CN RF5-1077-030CN RB1-2127-000CN RB1-2205-000CN RB1-2126-000CN RB1-2632-000CN RB1-2650-000CN RB1-3477-000CN RB1-7911-000CN RB1-7983-000CN RF5-0349-000CN RB1-2263-000CN RB1-3516-020CN RF5-0534-000CN RF5-1076-020CN RB1-2299-030CN XA9-0585-000CN XA9-0668-000CN XA9-0591-000CN XA9-0574-000CN XA9-0678-000CN XB6-7300-409CN XB6-7300-409CN XA9-0617-000CN XA9-0670-000CN XA9-0702-000CN XB2-8300-607CN XA9-0591-000CN RS5-9055-000CN
Fig. # 8-10 8-8 8-8 8-6b 8-6b 8-6b 8-12 8-12 8-6b 8-6b 8-12 8-4d 8-10 8-10 8-8
Printer 4+/4+/5 4/4+ 4 4+ 4+ 4/4+/4+/5 4/4+ 5
8-8 8-4b 8-4b 8-3a 8-4c 8-10 8-10 8-4c 8-4c 8-4c 8-10 8-10 8-11 8-10 8-10
4/4+/5 4/4+/5 4+/5 4/4+ 4/4+/5 4+/4+/5 4+/4/4+/5 4/4+/5 4+/5 4/4+/5

RF5-0716-000CN

8-54 Parts and Diagrams
Description Screw, w/Spring Washer Screw, w/Spring Washer Screw, w/Washer, 2 ea Screw, w/Washer, 4 ea. Sensor PCA Shaft Sheet Sheet Shield, Font Cover Shield, Font Cover Shield, Font Cover Shutter Spring, Torsion Shutter, Arm Shutter, Laser Spring, Compression Spring, Compression Spring, Compression Spring, Compression, 4 ea. Spring, Compression, 4 ea. Spring, Guide Spring, Leaf Spring, Leaf Spring, Left Cartridge Guide Spring, Roller, 4 ea. Spring, Switch Spring, Switch Spring, Tension Spring, Tension (Qty. 2) Spring, Torsion Static Eliminator Stop, Hinge
Part # XA9-0584-000CN XA9-0670-000CN XA9-0267-000CN FA9-1449-000CN RG5-0514-000CN RF5-0375-000CN RB1-2312-000CN RB1-2313-000CN RB1-2366-000CN RB1-3496-000CN RB1-7898-000CN RB1-2122-000CN RB1-2111-030CN RB1-2080-000CN RS5-2168-000CN RS5-2218-000CN RS5-2265-020CN RS5-2185-000CN RS5-2267-000CN RB1-2286-000CN RB1-2330-000CN RB1-7893-000CN RB1-5731-000CN RB1-2302-000CN RB1-2358-000CN RB1-2966-000CN RS5-2180-000CN RS5-2170-000CN RB1-5732-000CN RB1-2237-020CN RB1-2314-000CN

As the paper moves from the Switchback Assembly, it is picked up by the rollers that are operated by the Holding Tray Input Stepper Motor. The Input Stepper Motor moves the paper into the Holding Tray. When the paper moves the flag that controls the Holding Tray Paper Sensor, the Duplex Control PCA turns off the Input Stepper Motor, and the paper stops moving. The paper remains in the Holding Tray until the print engine signals the Duplex Control PCA that it is ready to print the second side. The Duplex Control PCA will then turn on both the Holding Tray Input Stepper Motor and the Holding Tray Output Stepper Motor. These motors will move the paper out of the Holding Tray into the paper input of the print engine. The paper is then printed on the second side. When the paper exits the Fuser Assembly, the Switchback Input Guide routes the paper directly to the printers output tray.

Figure A-2

Duplexer Major Components

A -4 Duplexer

Electrical Overview
The block diagram in Figure A-3 shows the Duplexer electrical components.
AC POWER TO PRINTER INPUT AC POWER
FAN AC POWER SUPPLY SWITCHBACK SOLENOID DUPLEXER CONTROL PCA SWITCHBACK STEPPER MOTOR HOLDING TRAY STEPPER MOTOR SWITCHBACK PAPER SENSOR HOLDING TRAY PAPER SENSOR

TO PRINTER DC CONTROLLER

Figure A-3

Electrical Block Diagram

Installing the Optional Duplexer
The optional Duplexer can be installed by the customer. There are no fasteners securing the units together. The printer simply rests in place on top of the Duplexer, which, in turn, rests on top of the optional 500-sheet Lower Cassette, if used. To install the Duplexer, first turn power OFF and disconnect all cables from the printer. Follow the steps below, referring to the corresponding steps illustrated in Figure A-4.
Open the printers rear door and use needle-nose pliers to
release the door strap from the printer. LJ 4 +
Grasp the plastic retaining clip and lift it upward and Slide the door toward the left. Swing the right end of the door out from the printer and
slide it toward the right to free it from its hinge. away from the door.
Flex the rear door to release it from its hinges. (Press the
middle of the door while lifting either side.)
Place the Duplexer on a flat surface and tilt the Switchback Verify the alignment pins on the Duplexer mate with the holes
in the bottom of the printer, and if used, the top of the optional 500-sheet Lower Cassette. Place the printer on top of the Duplexer. Close the rear door (Switchback Assembly) and plug in all cables - note routing of the power cables as shown. Assembly partially back.
Removal of the Duplexer from the printer is the reverse of installation - simply unplug cables, unlatch the Switchback Assembly, and lift the printer off the top. If the optional 500-sheet Lower Cassette is being used, lift the duplexer off the Lower Cassette. For further information, refer to the illustrated steps in Figure A-4 on the next page.

IR Diodes

Connect Pass

Peripheral Test

Computer Test
Test Modes PCL Printer PostScript Printer Energy Detect Test Frame

itch sw es

Figure B-8

Infrared Test Tool

To test the peripheral device:
1 Put the HP LaserJet 5 in Ready Mode. 2 Press the Peripheral Test button on the test tool. The LEDs
on the test tool will sequence. If the PASS LED lights, the test was successful, indicating that communication with the printers IR port is functioning normally.
LaserJet 5/5M/5N Printer B-39
On HP Laser-Jet printers, a self-test page will be initiated by the test. If the TEST LED goes out and the PASS LED fails to light, the printers IR port is not functioning correctly; check the operators instructions included with the IR test tool. To test the host computer:
1 Place the test tool on a table in front of the PCs IR port. 2 Press the computer Test button. The test tool will sequence
the LEDs. If the PASS LED light, the test was successful, indicating that communication with the printers IR port is functioning normally. If the TEST LED goes out and the PASS LED fails to light, the hosts IR port is not functioning correctly.
B-40 LaserJet 5/5M/5N Printer
Infrared Port Not Responding
Table B-21 Solutions for Infrared Not Responding
Situation The connection cannot be established or the transmission seems to be taking longer than usual.
Solution Make sure the device you are using is IrDA-compliant; look for an IrDA symbol on the device or refer to the manual for the device for IrDA specifications. Make sure that the operating system on your computer includes an IR driver and your application uses a HP LaserJet 5/5M/5N compatible printer driver. Make sure you have positioned the device within the range of operation and that no objects, such as a finger, paper, books, or bright light, are interfering with the connection. Also make sure the two IR ports are clean (free from dirt and grease.) Bright light of any kind (sunlight, incandescent light, fluorescent light, or light from an infrared remote control, such as those used for TVs and VCRs) shining directly into one of the IR ports may cause interference. Position the device closer to the printers IR pod.
LaserJet 5/5M/5N Printer B-41
Situation The printer prints only part of a page or document.
Solution The connection has been broken during transmission. If you move the portable device during transmission, the connection can be broken. IrDA-compliant devices are designed to recover from temporary connection interruptions. Re-establish the connection (depending on the device you are using, you can have anywhere from 3 to 20 seconds to re-establish the connection)
The print job has been properly If the connection is broken sent to the printer, but the printer before the entire print job has will not print. been transmitted to the printer (printing has not yet started), the printer may not print any of the job. If the Data light is on, press the Job Cancel button to clear the printers memory. Then, position the device within the range of operation, and print the job again. The IR status light turns off during transmission. The connection may have been broken If the Data light is on, press the Job Canel button to clear the printers memory. Then, position the device within the range of operation, and print the job again.