Appendix C: Theory of operation
POR sequence
At power on, the engine code goes through a series of tests to verify hardware integrity. If a hardware failure is detected,
it will be reported to the printer. If the POR sequence cannot be completed successfully, the printer may post an error
message identifying service may be needed.
Printer control
The printer uses a single processor for both RIP and engine functions. The raster image processor (RIP) code performs
system responsibilities such as PC connection, LAN, ISP attachments, and bitmap generation. The engine code performs
tasks related to the operation of the electrical and mechanical device systems such as motors, lasers, power supplies,
and fusers. The NVRAMs are located on the controller board and control panel, replacement of either the controller
board or control panel will pull or mirror NVRAM data from each other.
Paper path information
Input tray
When feeding media, the ACM lowers to come into contact with the media. The pick rollers on the ACM rotate to push
the media to the wear strips at the front of the tray. The wear strips provide a fixed resistance to ensure that sheets
are fed one at a time. The media is then fed to the secondary input roller and then to the first input roller.
First input roller
Secondary input
roller
Wear strips
Pick rollers
Option tray
Multipurpose feeder (MPF)
The driving force from the main drive motor is transmitted through the MPF gearbox. When the MPF solenoid activates,
it allows the MPF sector gear linked to the MPF gearbox to rotate. The MPF pick roll shaft is connected to the MPF
sector gear.
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Appendix C: Theory of operation
277
Summary of Contents for M1140
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Page 197: ...b Set the spring over the plunger 4514 Repair information 197 ...
Page 204: ...3 Squeeze the latches B to release the left and right links B 4514 Repair information 204 ...
Page 228: ...10 Remove the screw C and then detach the trailing edge sensor A 4514 Repair information 228 ...
Page 229: ...11 Disconnect the two springs D 4514 Repair information 229 ...
Page 246: ...3 Swing the right cover backward to remove 4 Remove the screw D 4514 Repair information 246 ...
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Page 255: ...Assembly 1 Covers 4514 Parts catalog 255 ...
Page 257: ...Assembly 2 Electronics 1 4514 Parts catalog 257 ...
Page 259: ...Assembly 3 Electronics 2 4 3 2 1 6 5 4514 Parts catalog 259 ...
Page 261: ...4514 Parts catalog 261 ...
Page 262: ...Assembly 4 Frame 4514 Parts catalog 262 ...
Page 264: ...4514 Parts catalog 264 ...
Page 265: ...Assembly 5 Option trays 3 4 5 6 1 2 4514 Parts catalog 265 ...
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Page 298: ...4514 Part number index 298 ...
Page 302: ...4514 Part name index 302 ...
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