Lexmark X7500 Service Manual - Page 14

Duplex Auto Document Feeder (DADF) Power Principles of Operation, DADF Control - roms

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4036-501 Duplex Auto Document Feeder (DADF) Power Principles of Operation The power cord carries AC line voltage to the external low voltage power supply (LVPS). The LVPS converts the 120/220VAC to regulated +5VDC, +12VDC, and +24VDC voltages. The LVPS sends these voltages to the main power switch in the Multifunction Device (MFD) controller cage. The voltage is then sent to the power distribution board. The +5VDC and +24VDC voltages are sent through the image processing board and onto the scanner through the 120 pin scanner cable. The voltage travels from the scanner cable into the scanner system board where it passes onto the DADF. DADF Control The DADF control card provides the logic and information processing that is necessary for the DADF to function. Every electrical component within the DADF is connected to the control card. Sensors in the DADF send status information to the control card. The control card processes that information, shares it with the MFD controller cage, and compares it to timing tables stored in ROM. Acting on the results of the processing, the control card sends commands to the various DADF components. 1-4 Service Manual

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1-4
Service Manual
4036-501
Duplex Auto Document Feeder (DADF) Power Principles of Operation
The power cord carries AC line voltage to the external low voltage power supply (LVPS).
The LVPS converts the 120/220VAC to regulated +5VDC, +12VDC, and +24VDC
voltages. The LVPS sends these voltages to the main power switch in the Multifunction
Device (MFD) controller cage. The voltage is then sent to the power distribution board.
The +5VDC and +24VDC voltages are sent through the image processing board and onto
the scanner through the 120 pin scanner cable. The voltage travels from the scanner
cable into the scanner system board where it passes onto the DADF.
DADF Control
The DADF control card provides the logic and information processing that is necessary
for the DADF to function. Every electrical component within the DADF is connected to the
control card. Sensors in the DADF send status information to the control card. The control
card processes that information, shares it with the MFD controller cage, and compares it
to timing tables stored in ROM. Acting on the results of the processing, the control card
sends commands to the various DADF components
.