Laser Jet 4P4MP Control Panel Overview

The HP LaserJet 4P 4MP printer's front control panel consists of a < 16 character backlit LCD display, an 8 key control panel, and 4 LED status lights situated on top of the printer. To access a primary key function (such as On Line, Form Feed, or Menu) just press the appropriate key. To access secondary key , functions (Reset, EconoMode and -), use the H mil key. For I example, to access the reset function of the key, press n n n and simultaneously. LaserJet 4P 4MP Control Panel Display and...

Repetitive Image Defect Ruler

Primary Charging Roller 38 mm (1.5 in) - Face Down Delivery (Upper) Roller 38 mm (1.5 in) Fusing Pressure Roller 47 mm (1.85 in) Upper Fusing Assembly Film 75 mm (2.95 in) - Toner Cartridge Photosensitive Drum 75 mm (2.95 in) Registration Roller 119 mm (4.7 in) - Figure 7-9 Repetitive Image Defect Ruler Figure 7-10 Main Wiring Diagram (generalized) Figure 7-10 Main Wiring Diagram (generalized)

Accessories and Supplies

Diagram Inside Pyramid

The following items are available through your local authorized HP dealer. To find a dealer near you (or if your dealer is temporarily out of stock), call the HP Customer Information Center (800) 752-0900. 01 g Refer to Ordering Related Documentation in __Chapter 1 for documentation part numbers. 01 g Refer to Ordering Related Documentation in __Chapter 1 for documentation part numbers. 1 Mb memory upgrade, LaserJet 4L only (New) 1 Mb memory upgrade, LaserJet 4L only (Exchange) 1 Mb Memory...

Printing an Engine Test Laser Jet 4P4MP

On the LaserJet 4P 4MP, the printer's covers and the Formatter I PCA must be removed prior to printing an Engine Test. Since the covers will be removed, the printer's safety interlocks must be defeated to provide power for running the Engine Test. To defeat the interlocks and set-up the printer for an Engine Test 1. Remove the printer cover, the Formatter Shield and the Formatter PCA (see Chapter 6). 2. Install the paper cassette (with paper loaded). 3. Install a toner cartridge in the printer....

Power System on DC Controller PCA

The ac, dc and high voltage power supply circuits are all contained within the DC Controller PCA. The ac power circuitry, located on the DC Controller PCA, supplies ac voltage to the DC Power Supply whenever the printer's power cord is connected to the ac power source. (The power switch must be turned ON in the LaserJet 4P 4MP.) A toner cartridge must be installed and the top door closed before voltage is supplied to the High Voltage Power Supply or Main Motor drive circuitry. The DC Power...

DC Controller Assembly

The DC Controller Assembly is located on the bottom of the printer. The PCA is protected by a metal shield assembly, and is mounted to a plastic base. The Formatter PCA and Fusing Assemblies are connected directly into the DC Controller and must be removed prior to removal of the DC Controller Assembly. 1. Remove the Printer Cover, the Fusing Assembly (Figure 6-27), the Formatter Shield and PCA (Figure 6-13), and the Power Switch Assembly (LaserJet 4P 4MP only - Figure 6-23). Failure to remove...

Numerical Parts Index

DC Controller PCA, 100-120V, LJ 4L 4ML (Exchange) DC Controller PCA, 220-240V, LJ 4L 4ML (Exchange) Laser Scanner Assembly, LJ 4L 4ML (Exchange) DC Controller PCA, 100-120V, LJ 4P 4MP (Exchange) DC Controller PCA, 220-240V, LJ 4P 4IMP (Exchange) Laser Scanner Assembly, LJ 4P 4MP (Exchange) RFI Shield, Control Panel PCA, LJ 4P 4MP Laser Scanner Assembly, LJ 4L 4ML (New) Beam-to-Drum Mirror Assembly, LJ 4L 4ML Gear Train Plate Assembly, LJ 4L 4ML DC Controller PCA, 100-120V, LJ 4L 4ML (New) DC...

Alphabetical Parts Index

Beam-to-Drum Mirror Assembly, LJ 4L 4ML Beam-to-Drum Mirror Assembly, LJ 4P 4MP DC Controller PCA, 100-120V, LJ 4L 4ML (Exchanqe) DC Controller PCA, 100-120V, LJ 4L 4ML (New) DC Controller PCA, 100-120V, LJ 4P 4MP (Exchange) DC Controller PCA, 100-120V, LJ 4P 4MP (New) DC Controller PCA, 220-240V, LJ 4L 4ML (Exchange) DC Controller PCA, 220-240V, LJ 4L 4ML (New) DC Controller PCA, 220-240V, LJ 4P 4MP (Exchange) DC Controller PCA, 220-240V, LJ 4P 4MP (New) Gear Train Plate Assembly, LJ 4L 4ML...

BiTronics Parallel Cable Information

The Bi-Tronics parallel interface is compatible with Centronics parallel interfaces. To take advantage of its enhanced capabilities such as bi-directional communication between the computer and printer, faster transmission of data, and auto configuration of printer drivers the customer must have Support in software applications for these features. A parallel cable with the correct pin configuration (see below). For best results, use the C24542D cable, or equivalent. Most existing parallel...

Laser Jet 4L4ML Control Panel Overview

The HP LaserJet 4L 4ML printer's front control panel consists of 4 status lights and a front panel button situated on top of the printer. The LED lights provide a quick way to check the printer's status. Ready (Green) STEADY The printer is ready to print a job from the paper cassette. BLINKING If this light is blinking and the Data light is on steadily, the printer is receiving or processing data. STEADY If the Data light is on steadily and the Ready light is blinking, the printer is receiving...

Print Engine Control

Based on information received from the Formatter, the DC Controller sends a signal to the Laser Scanner PCA to modulate the laser diode ON and OFF. The modulated laser beam strikes the surface of a rotating scanning mirror, is directed through a focusing lens onto the Beam-to-Drum Mirror, and is then reflected onto the photosensitive drum. Synchronization of the process is achieved by continuous monitoring of the beam detect signal, which is fed back to the system from one end of the focusing...

Install Printer Drivers and Utilities optional

Printer drivers are specialized programs designed to allow specific software applications to function with the HP LaserJet printers. Printer utilities include such things as the HP Explorer program modules, which enhance the usability of the printer and provide convenient access to printer features outside of specific software applications. First, check the software's printer selection feature to see if the printer is listed among the available printers. If it is not, run the software's SETUP...

Saving Toner with Econo Mode

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's front panel (LaserJet 4P 4MP only), through HP Explorer's Remote Control Panel or through a software application with the appropriate printer driver. See Chapter 3 for information on the HP Explorer Remote Control Panel. Notes EconoMode functions in portrait orientation only. Some software applications may refer to this as draft mode....

PJL Software Commands

Many of the control panel functions explained in this chapter can also be accessed through PJL software commands sent from the host computer. For the LaserJet 4ML printer, functions such as entering Service Mode, are accessible only through PJL commands. (Note that Service Mode is available only on the LaserJet 4ML, 4P and 4MP, and not on the LaserJet 4L.) The following example shows how to use PJL commands to enter Service Mode and perform various Service Mode configuration tasks. Note Text is...