Fuser Heater Bulb

This topic applies to all models of the printer. Before you begin, remove the fuser assembly. 1 Remove the gold-colored screw and the washer that secure the right side of the heater bulb. 2 Remove the two gold-colored screws on the left end that secure the left connector bracket to the fuser assembly. Remove the two gold-colored screws on the left rear face that secure the left connector bracket to the fuser assembly (1 and 2). Remove the screw and washer that secure the heater bulb cable to...

L

This topic applies only to the LS L model. Before you begin, remove the following 1 Disconnect connector J21 2 from the serial controller and remove the cable from the black cable retainer near J21 2. 2 Disconnect connector J101 by squeezing it and then lifting up. 3 Remove the three mounting screws and lift out the power supply.

DC Controller Board

This topic applies only to the SC, NT, NTR, and LS models. Before you begin, remove all following items present in the model Note Perform this procedure only when you're replacing the controller board itself. If you're replacing a deeper module, perform the DC Controller Mount Plate topic. Warning Never disconnect optical fiber cable J204 when the printer is powered on. Its invisible laser beam can damage your eyes. 1 Disconnect the following cables from the DC controller board Laser assembly...

Nip Width Measurement

Before you begin, remove the following You should perform the nip width measurement whenever poor or irregular fusing occurs. This measurement shows whether the fuser assembly rollers exert uniform pressure on each page. If they don't, replace the lower fuser roller. If the problem persists, replace the fuser assembly. Perform the procedure as described below. 1 Using a copy machine, make several copies of letter-size, all-black paper. Place the black sheets on the multipurpose tray. 2 Switch...

Startup Test Pages

The Personal LaserWriter SC, NT, and NTR generate a startup test page 2-3 minutes after you switch on the printer. The LS and LS L do not produce such a page. In the NT and NTR the startup test page also shows unit-specific configuration information. The following pages describe each element of the startup test pages. Communication Protocol RS-232 serial or AppleTalk Number of pages the I O board has produced The Personal LaserWriter SC test page consists of a line matrix. The printer generates...

High Voltage Contact Assy

This topic applies to all models of the printer. Before you begin, remove all following items present in the model 1 Pull out the plastic tray from beneath the scanner assembly and disconnect connector J602 from the high-voltage power supply. 2 Disconnect the high-voltage cable. Remove the contact assembly mounting screw. Remove the power supply cable from the cable guide on the highvoltage contact assembly. Lift out the high-voltage contact assembly.

Flowcharts

The flowcharts for this manual are contained in an interactive file called PLW SC NT NTR LS Flowcharts. This file has been derived from the original version of Service Source but is a standalone self-launching application. To launch this file, click the button below Personal LaserWriter SC NT Wiring Diagram Personal LaserWriter LS Wiring Diagram

High Voltage Power Supply

How Draw Ntr

This topic applies to all models of the printer. Before you begin, remove all following items present in the model 1 Lift and draw out the plastic tray containing the high-voltage power supply. 2 Disconnect connectors J601, J602, and the high-voltage cable connector. 3 Remove the highvoltage power supply. Note The high-voltage power supply does not ship with the plastic tray or grounding plate. Replacement Note Make sure that the high-voltage cable connector nests snugly in the guide tabs on...

IO Board LS

This topic applies only to the LS model. Before you begin, remove the following Disconnect the cable from connector J803 on the I O board. Remove the three screws that secure the I O board in place. Holding the board only by the edges, disengage it from the I O bracket. Gently lift straight up, and disconnect the I O board from the controller board.

Ntr Rom Upgrade

The NTR ROM Upgrade Kit consists of six ROMs. The following numbers are imprinted on the six Rev. 4.0 ROMs Rev. 4.0 ROMs, you must remove the ROMs and install them on the replacement board. Replacement NTR boards do not have Rev. 4.0 ROMs. Caution Old ROMs must be returned to Apple. Refer to August 1993 Service Notices for complete information on the Personal LaserWriter NTR ROM U63 H2 Repair Extension Program.

Power Supply LS

This topic applies only to the LS model. Before you begin, remove the following 1 Disconnect the power supply cable from power switch connector SW11 not shown . Remove the power cable from the cable retainer. 2 Disconnect the power supply cable from DC controller board connector J212 and remove the cable from the cable retainer. 3 Disconnect connector J101 by squeezing it and then lifting up. 4 Remove the three mounting screws and lift out the power supply.

Cleaning Page

Use the cleaning page if frequent paper jams occur in the fuser area or after replacement of the toner cartridge. The cleaning page removes excess toner from the fuser rollers and other rollers inside the printer. 1 Place several sheets of paper on the multipurpose tray. 2 Open the Cleaning page file located on the Personal LaserWriter Installation Disk. 3 Select Print from the File menu and Manual Feed in the subsequent dialog box and click OK. The printer will print a cleaning page. Place the...

Service Test Page

Successful printing of a service test page confirms print engine operation. There are three variations in how you run a service test page, depending on the model you are servicing. Each involves using a pencil or similar dowel-shaped tool to depress the service test button on the DC controller board or serial controller on the LS L . First remove the I O board. You can then access the test button through the 1 4-inch diameter opening in the I O shield. First remove the I O board bracket. You...

FaceUp Cover Assembly

This topic applies to all models of the printer. Before you begin, detach the face-up tray and remove the fuser assembly. 1 Using needlenose pliers, unhook the tension spring that connects the face-up cover to the front access door. 2 Open the face-up tray by pulling up on the green latch on the outside of the front access door. 3 Grip the bottom edge of the face-up cover with your fingertips and bend it slightly to release the holding pins at each end. The face-up cover should fall into your...

Fuser PCB Assembly

This topic applies to all models of the printer. Before you begin, remove the following Face-down delivery assembly Remove the screw that fastens the rod assembly to the front access door. Remove the black screw that secures connector J501 to the front access door. Remove the black screw that secures the cable retainer to the front access door. Lift out the cable retainer.

Transfer Guide Assembly

This topic applies to all models of the printer. No preliminary steps are required before you begin this procedure. Note This procedure also covers the removal of the left and right transfer roller mount assemblies and the transfer roller. 2 Note On the LS L the grip on the right side A has been closed into a ring. In the following step, you must first lift the left end of the assembly, then slide it out and to the left. Grasp each end of the transfer guide assembly and lift it out of the...

Serial Controller

Macmini Fan Sensor

This topic applies only to the LS L model. Before you begin, remove the following Awarning Never disconnect optical fiber cable J204 when the printer is powered on. Its invisible laser beam can damage your eyes. 1 Disconnect the following cables from the serial controller board Laser assembly board cable from J202 Scanner motor board cable from J203 Optical fiber cable from J204 Cassette feeder board cable from J205 High-voltage power supply cable from J206 Paper pickup sensor cable from J208...

Fuser Assembly

Laserwriter Ntr

This topic applies to all models of the printer. No preliminary steps are required before you begin this procedure. 2 Lift up the face-down delivery assembly and remove the five gold-colored screws that secure the fuser assembly to the front access door. screwdriver, carefully pry between the fuser assembly and the front cover at the right edge A while you pull out the fuser assembly. Replacement Note Make sure that the connector pins at each end of the front access door make proper contact...

DC Controller Mount Plate

This topic applies only to the SC, NT, NTR, and LS models. Before you begin, remove the following Note Perform this procedure only when you're replacing the controller board itself. If you're replacing a deeper module, perform the DC Controller Awarning Never disconnect optical fiber cable J204 when the printer is powered on. Its invisible laser beam can damage your eyes. Note The following step does not apply to the Personal LaserWriter LS. 1 Carefully disconnect the cables from interconnect...