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09/2007
8-6
Phaser 8860/8860MFP Service Manual
System Electronics
Initial Issue
Theory of Operation
System Electronics
The Phaser 8860MFP has two controller boards: the main board, contained in the Electronics
Module, and the Exit Module Control Board. For both models, the main board controls all
image processing by way of an integrated daughter board. The main board also controls net-
work functionality, PS and PCL interpretation, memory, job management, device management
interfaces and a host of other services. The Exit Module Control Board, exclusive to the
8860MFP, provides low level motor control for the Exit Module components. The 8860MFP
also contains a Scanner Power Supply located next to the Exit Module Control Board on the
Backframe (see
Figure 1
). This supplies power to the Scanner, DADF, and the Exit Module
motors.
For more information, or block diagrams showing the interaction between the system electron-
ics, see the Wiring section of the manual.
NOTE:
Although the Control Panel is part of the Scanner Assemby on the 886MFP, it receives
power from the Electronics Module power supply.
Figure 1 Electronics Locations
Exit Module Control Board
The 8860MFP Exit Module Control Board controls motor and paper path functions for the
8860MFP Exit Module. Once the print process is complete and the media is ready to exit the
IOT, the primary controller relinquishes control to the Exit Module Control Board. The Exit Mod-
ule Control Board is also the connection point for the Output Tray Full Sensor, Cover Interlock,
Exit Module elevator carriage, and exit sensors and flags.
Scanner Power Supply
The 8860MFP Scanner Power Supply supplies power to the Scanner and Exit Module assem-
blies using the following voltages:
•
+24 V to the Scanner
•
+24 V and +5 V to the Exit Module Control Board
The Electronics Module enables or disables the Scanner Power Supply using the power supply
enable line for functions such as Intelligent Ready and standby functions. The Control Panel
receives power from the power supply contained in the Electronics Module.
Electronics Module
The Electronics Module includes the main board, image processing board, power control
board, and the power supply. The Electronics Module is replaced as one assembly and is
unique for each model.
The imaging process is a "three way" communication between the Electronics Module, Print-
head, and Wave Amplifier. Imaging data is received from either the print or scan function and is
processed through the imaging path portion of the main board. This data then is split into two
paths. One of these paths is through the power control board to the Wave Amplifier. This data
controls the operation of the Wave Amplifier with regard to the drive algorithm to use for driving
the jet stacks (discussed later in the Printhead section). The second path is through a ribbon
cable from the main board to the Printhead control board (located on the underside of the Print-
head). These two signals are interpreted by the Printhead to produce the image on the drum.
Electronics Module Components
Main Board
The main board controls the operation of all the mechanical and electrical
systems in the IOT. Through the power control and I/O boards, signals
are passed to the different gear trains, heater controls, and drive motors
and signals are received from sensors for proper operation of the IOT.
The main board provides support for Ethernet and USB 2.0 external I/O
interfaces.
Image Processor
Board
The image processor board provides the interface between the main
board and the scanner. The image processor board includes a complete
color image path, taking raw 24-bit RGB scanner data and creating print
ready CMYK or B&W binary data, 8-bit RGB data, or 8-bit grayscale data.
NVRAM
NVRAM, located on the main board, stores Control Panel defaults, net-
work settings, IOT calibration data, copy counts, usage profile data, and
the system serial number, which is also referred to as the engine tracking
number (ETN). When the Electronics Module is replaced, transfer the
NVRAM to the replacement Electronics Module.
Memory
Two PC3200 compatible DDR SDRAM memory connectors are available
supporting a minimum of 256 MB and maximum of 1 GB.
Summary of Contents for Phaser 8860
Page 1: ...705P01205 September 2007 Phaser 8860 8860MFP Service Documentation...
Page 4: ...09 2007 iv Phaser 8860 8860MFP Service Manual Initial Issue Introduction...
Page 28: ...09 2007 1 2 Phaser 8860 8860MFP Service Manual Initial Issue Service Call Procedures...
Page 34: ...09 2007 2 2 Phaser 8860 8860MFP Service Manual Initial Issue Error Messages and Codes...
Page 94: ...09 2007 3 2 Phaser 8860 8860MFP Service Manual Initial Issue Image Quality...
Page 126: ...09 2007 4 2 Phaser 8860 8860MFP Service Manual Initial Issue Repairs and Adjustments...
Page 208: ...09 2007 5 2 Phaser 8860 8860MFP Service Manual Initial Issue Parts List...
Page 222: ...09 2007 6 2 Phaser 8860 8860MFP Service Manual Initial Issue Diagnostics...
Page 274: ...09 2007 7 2 Phaser 8860 8860MFP Service Manual Initial Issue Wiring Data...
Page 294: ...09 2007 8 2 Phaser 8860 8860MFP Service Manual Initial Issue Theory of Operation...