Electrical Components And Controller - Lexmark X850e Service Manual

7500-XXX

Electrical components and controller

Switch (main power)
Turning on/off the switch, power supplies/cuts off the main power of the printer.
Finisher AC output
Supplies power to the finisher from the main LVPS (low voltage power supply) card assembly.
Switch (printer front door interlock) and switch (printer left door interlock)
The switch is a safety switch to cut off a 24 VDC power supply from the LVPS card assembly to the high volt
power supply (HVPS) card assembly, printer engine card assembly and to the dual motor assembly, while the
printer front door assembly and the printer left door assembly are open.
Switch (PC Cartridge interlock)
The switch (PC interlock) 5 V interlock is a safety switch to cut off a 5 VDC power supply from the LVPS card
assembly to the printhead while the PC cartridge is removed.
Switch (printer left lower door interlock)
The switch (left lower door interlock) detects open or close of the printer left lower door assembly.
Fuser cooling fan
The fuser cooling fan discharges air from the printer to prevent excessive temperature increase.
LVPS card assembly
The LVPS card assembly generates low voltages (5 V and 3.3 V for logic circuits, 5 V for laser diodes, and 24 V
for motors/clutches) from AC power. It also contains the fuser relay to feed/cut off AC power to the heater lamps
of the fuser assembly.
HVPS card assembly
The HVPS card assembly generates AC power, a high DC voltage, and feeds them to the charge roll,
development (magnet roll), transfer roll assembly.
Printer engine card assembly
The printer engine card assembly controls printing operation based on the communication with the RIP card
assembly and on sensor/switch information. It also controls optional module boards.
RIP card assembly
The RIP card assembly connected to the printer engine card assembly controls the entire system.
Transport roll assembly
The transport roll assembly feeds media from tray 2, 3, and 4 to the registration roll assembly.
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MFP Service Manual