High Voltage Control Operation

When the PRNT signal sent from the I O controller goes L, and the print sequence command is entered from the DC controller to the mechanical controller, the mechanical controller rotates the drum motor and controls the high-voltage control IC (IC1003) on the high-voltage power supply board as follows. Voltage to The high-voltage control IC (IC 1003) on the high-voltage power Primary supply board outputs the primary charging DC voltage drive signal Charging ( HV1DC1), primary charging AC voltage...

DC Controller Input Output Signals

L to switch ON the laser diode forcibly. Reset signal Clock signal Analog signals are output to control the laser power. _ Voltage is input in proportion to the laser power. L when the BD signal is input. SCNON L to drive the scanner motor. SCNRDY L when the scanner motor is rotating normally. OILSNS H when oil runs out. LEDON L when the power-saving mode is set. WEBSNS H when the cleaning belt has run out. H switched to L when the TOP position of the transfer...

Mechanical Controller Board Input Output Signals

Transfer Drum Cleaner Press Solenoid DEVHP H when a flag is detected. See Carousel Rotational Detection in this chapter. L when the toner cartridge is pressed against the photosensitive drum. H when the toner cartridge is separated from the photosensitive drum. DEVON L to turn ON CL2, rotating the toner carousel H to turn OFF CL2, rotating the cartridge sleeve. DEVBRK L to turn ON CL1, braking the toner carousel. OILFUL H when oil overflows from oil pan. L to turn ON SL12. the cleaning belt. L...

Startup Tests

When you switch on power, all the status panel lights illuminate briefly. This confirms that power is getting to the status panel and that all LEDs are operational. The lights then extinguish and the four primary lights come back on. This marks the start of the Power-On Self-Test (POST). POST is a set of diagnostic procedures that are written into firmware on the I O controller board. POST occurs during normal printer startup. POST checks the following four areas of the printer Stage 1 I O...

Paper Pickup

Cassette When the print sequence command is received, the mechanical Feeding controller drives the main motor (M2) and, 0.2 second later, also drives the drum motor (M4) and the pickup motor (M1). Simultaneously, the pickup solenoid (SL1) is turned on and the drive of the pickup motor is transferred to the pickup roller, feed rollers, and separation roller. After any multifeed pickup is eliminated by the separation roller, the paper is fed into the printer by the rotations of feed rollers 1 and...

Transfer Drum and Peripherals

Gripper Solenoid

Outline The transfer drum is the mechanism that enables multiple-pass printing. It clamps the leading edge of the paper by means of a solenoid-actuated gripper, attracts and holds the paper to its surface, and then carries the paper past the photosensitive drum where toner transfer occurs. In full-color mode, toner transfer occurs four times per page, while in the monochrome mode transfer occurs once. The transfer drum is surrounded by the attraction roller, the photosensitive drum, the...

Print Quality Issues

This topic addresses general print quality defects that can occur in the Color LaserWriter 12 600 PS. Since color quality is largely subjective and some nuances are nearly impossible to describe, we encourage you to familiarize yourself with all the general issues covered in this topic. To learn general principles of color theory, go to the Interactive Color 1.6 folder that is bundled on Service Source CD. This application requires a color Macintosh with screen resolution of 640x480. Note Best...

Upgrade Path

You can upgrade a Color LaserWriter 12 600 PS to a Color LaserWriter 12 660 PS by installing version 2.0 ROMs onto the customer's I O controller board. The version 2.0 ROM upgrade kit is available as P N 076-0621. The contains eight ROM ICs, a user manual addendum, a software installation CD, and upgrade labels. Note Install new ROM only if the customer's printer is exhibiting one of the problems described below. Install a replacement I O controller board P N 661-0133 only if your...

Laser Control Circuit

Laser Emission The DC controller generates 8-bit video data signals DV2-DV9 and mode setting signals M1-M8 in the gate array IC109 in accordance with the video signals VDO0-VDO7 and image mode select signal IMCHR sent by the I O controller. It sends those signals to the PWM-IC in the laser driver board. Based on the above signals, the PWM-IC produces laser drive signals with the pulse width corresponding to the halftone, and then sends them to the laser driver circuit. At this time, when the...

Paper Path Animation

The icon to the left appears at key points throughout this manual. Clicking it launches a QuickTime animation called CLW Paper Path. This animation shows one complete print cycle through the Color LaserWriter 12 600 PS, starting at the point where the final sheet of paper is picked up from the cassette, and ending with the delivery of the paper at the top of the printer. The animation is very detailed and moves very quickly. By using the Step Back and Step Forward buttons at the bottom right of...

PS Leveling Instructions

Almost any non-compressible flat object can be used as a shim when leveling the Color LaserWriter. Items commonly found at customer locations which can be used include Post-It Notes , note cards, paper, magazines, etc. Other materials that can be cut to size include wood, plastic, and metal. Post-It Notes work well because the shim height can be easily adjusted by tearing off or adding pieces of paper. Install the shims under one or more of the small plastic feet found on the bottom of the...

Overhead Transparency Detection

Transparency With White Leading Edge

When you use overhead transparency material for this printer, you must use the type with a white band at its leading edge. The printer makes the following determinations by measuring the period that the paper leading-edge sensor PS303 is interrupted by this band Whether it is the correct type of transparency, another type of transparency, or paper Whether it is placed with the proper side up Whether it is placed with the proper edge leading Note The band and arrows on the left side of the...

Outline of Drive System

The printer has six motors the pickup motor, main motor, drum motor, toner carousel motor, cleaning brush motor, and scanner motor. See Motors Fans Heaters in the Parts chapter for additional information. Pickup Motor The pickup motor is a two-phase stepping motor in the paper pickup M1 block and is controlled by the cassette pickup board. The pickup motor provides mechanical drive to the following parts Cassette pickup roller Separation roller Registration roller Manual feed pickup roller...

Fuser Assembly

Outline The paper separated from the transfer drum is fed into the fuser assembly and then delivered from it after passing through the upper and lower fuser rollers and the fuser assembly delivery roller. This delivery from the fuser assembly is detected by the delivery paper sensor PS9 . For the face-up tray, the paper is delivered without passing over any additional roller, while for the face-down tray, it is delivered after passing over the face-down delivery roller. The deflector that...

Transfer Drum Cleaning Assembly page of

4 Slide the assembly to the left and pull it out of the printer. Remove the I O controller board, top cover, left cover, rear cover, rear shield plate, fuser fan, and mechanical controller mount and board. Remove the three brass-colored terminal-contact screws, the brass-colored screw that secures the assembly to the chassis, and the silver-colored grounding screw. Remove the contact cables from their guides and clamps. Note For clearance purposes, you must loosen the I O board housing so that...

Stage Transfer Drum Cleaning and Discharge

After the page has left the transfer drum, the printer must return the drum to a clean and electrically neutral state. During density calibration and after some paper jams, unfused toner may find its way onto the surface of the transfer drum. The transfer drum cleaning brush is designed to scrape this residual toner off the transfer drum. This function takes place following density calibration and following the opening closing of any of the doors. It also occurs as a routine maintenance measure...

Outline of Electrical System

The operation sequence for the printer is controlled by the microcomputers on the DC controller and the mechanical controller boards. When the printer is turned on and enters the standby state, the microcomputer on the DC controller sends signals for driving the laser diode, fuser heaters, and other loads in response to the print signal entered from the I O controller board. Simultaneously, the microcomputer on the DC controller sends the print sequence command to the microcomputer on the...

Photosensitive Drum Life Detection

Outline The printer determines the life of the photosensitive drum mathemati cally by tracking page count. When a new photoconductor cartridge is installed, the EEPROM on the DC controller board logs the current page count of the printer. This value becomes the starting page count for that photoconductor. During each subsequent print, the controller compares the running page count against the starting page count stored in EEPROM. If the difference between the two values reaches a prescribed...

Toner Carousel Control Outline

Carousel Printer Laser

The toner carousel consists of four cylindrical bays clustered around a central press assembly. Each bay is occupied by a single cartridge. Fetch When you load a cartridge into the printer, that color is said to be in a fetch position. As the cartridge clicks into place, nine separate pins engage. These pins assure a solid coupling that is critical to the mechanical functionality of the printer. See Toner Cartridge Installation for more information. Note The home position of the carousel is the...

Laser System

Scanning Mirror

When the PRNT signal is sent from the I O controller, the DC controller performs Automatic Photoemission Control APC to stabilize the intensity of the laser beam. Upon completion of APC, the DC controller generates 8-bit video data signals DV2-DV9 in accordance with the video signals VD00-VD07 sent by the I O controller and then sends them to the PWM-IC in the laser scanner assembly. According to the laser drive signal internal signal in the laser scanner assembly output from the PWM-IC, the...

Finished Goods Parts

Description The parts below are available through Finished Goods. This list contains both standard and optional parts. Color LaserWriter Toner Cartridge, Color LaserWriter Toner Cartridge, Color LaserWriter Toner Cartridge, Color LaserWriter Toner Cartridge, Color LaserWriter 12 600 PS 250-Sheet Color LaserWriter 12 600 PS Universal Color LaserWriter 12 600 PS Internal Hard Disk Color LaserWriter Photoconductor Replacement 110 V Color LaserWriter Fuser Replacement 220 V Color LaserWriter Fuser...

Toner Cartridge

Laserwriter Toner

Outline The toner cartridge includes a toner container with stirring plate, a toner feed roller, rubber blade, and developing cylinder. The developing cylinder, toner feed roller, and stirring plate receive rotational drive through the white toner cartridge drive gear on the photoconductor drive shaft. Toner carousel motor M3 supplies this drive in sync with the drive supplied to the photosensitive drum by drum motor M4. This internal drive train of the toner cartridge engages with the toner...

Motors FansHeaters

Locations The illustrations below show fan, motor, and fuser heater locations for the Color LaserWriter 12 600 PS and the optional sheet feeder. Descriptions The table below describes the fan, motor, and fuser heaters used in the Color LaserWriter 12 600 PS. Part of the cassette pickup assembly P N 661-0907 Part of the printer drive assembly P N 922-1334 Part of the printer drive assembly P N 922-1334 Part of the transfer drum cleaning assembly P N 922-1368 Part of the front sheet feeder pickup...