Engine Controller Pwb; Installing Additional Memory - Xerox DocuPrint P8e Service Manual

5.5 Engine Controller PWB

The Engine Controller PWB:
• Includes a motor driver that provides the signal necessary to turn the Main Motor.
• Provides the control signal that energizes the paper pick-up solenoid.
• Includes a temperature control circuit that monitors the fuser temperature and turns the heat rod on
and off.
• Monitors the signal from the Cover Open Sensor. If the front cover is open or the Developer unit is
out of the machine or installed correctly the printer will not operate.
• Provides the control signals necessary to operate the laser.
• Identifies the installation of a new Print Cartridge.
The Engine Controller PWB monitors four paper sensors.
• Feed Sensor: Located before the transfer process. Senses if paper is feeding and starts the
process of sending image data to the laser.
• Exit Sensor: The Exit Sensor is located next to the fuser and monitors paper travel in the fuser
area.
• Paper Detect Sensor: This sensor senses if there are papers in the Multipurpose Paper Feeder.
• Paper Width Sensor: Located on the side of the paper path, this sensor is used to detect narrow
paper.

5.6 Installing Additional Memory

The printer is equipped with 4Mb of resident base memory which is expandable to a total of 36Mb. The
base memory may be expanded by installing an additional Single Inline Memory Module (SIMM). By
doing this, the size of the receive buffer and the size of the font download buffer are increased. This also
enables the printing of more complex pages.
On the Controller PWB, there is only one SIMM slot dedicated to increase the printer memory. There are
four available SIMM options to increase the printer memory up to a total of 36Mb. All SIMMs are industry
standard EDO 72 pin 32-bit memory (no parity, 60 ns or faster), and are available in sizes of 4, 8, 16, or
32MB. When the SIMM is installed, the Controller PWB will automatically detect the memory and
increase the printer buffer size.
To install an additional memory module:
1 Switch off printer and disconnect the AC power.
2 Disconnect all cables from the back of the printer.
3 Open the front cover and remove the Print Cartridge.
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