Electrical - Epson AcuLaser C8500 Service Manual

EPSON AcuLaser C8500

2.5.14 Electrical

FRONT COVER SWITCH R
FRONT COVER SWITCH R is composed of two switches of an interlock switch
that detects whether the FRONT COVER ASSY is open or closed, and
interrupts the 5VDC-LD circuit that shuts off output (5VDC-LD) from the LVPS
when the FRONT COVER ASSY is open and a safety switch in control that
makes each movement stop when the FRONT COVER ASSY is open .
FRONT COVER SWITCH L
FRONT COVER SWITCH L is a control safety switch that shuts off 24VDC
when the FRONT COVER ASSY is open (interrupts Relay circuit in LVPS).
TOP COVER SWITCH
The TOP COVER SWITCH is an interlock switch that detects whether or not
the TOP COVER ASSY is mounted, and interrupts the 5VDC-LD circuit when
the TOP COVER ASSY is not mounted.
DEVE. FAN
Discharges internal heat to prevent the internal temperature from rising
excessively.
LVPS
Long with providing AC power from the power source to the H/R HEATER and
P/R HEATER of the FUSER ASSY, the LVPS creates and supplies low-voltage
DC power used by the logic circuit, etc.
Along with the power source circuit, the LVPS includes control circuits for the
H/R HEATER and P/R HEATER, inlet, power switch, etc.
HVPS
Supplies high voltage to the following parts to perform steps of the process
such as electrification, developing, primary transfer and secondary transfer.
Operating Principles
BCR inside DRUM CARTRIDGE
Magnet Roll inside Developer Assy
1ST BTR inside TRANSFER ASSY
CONTACT ROLL inside TRANSFER ASSY
MCU PWB
Controls printing based on communication with the printer controller (Controller
PWB) and data from the sensors and switches.
The main functions of the MCU PWB are as follows:
Communication with the printer controller
Reception of data from sensors and switches
Control of ROS ASSY, FUSER ASSY and motors (PROCESS DRIVE
ASSY, P/H MOTOR ASSY, FUSER MOTOR ASSY, ROTARY MOTOR
ASSY)
Control of print process
Distribution of low voltage DC power output from the LVPS
ENVIRONMENT SENSOR
The ENVIRONMENT SENSOR is the sensor for detecting temperature/
humidity that uses a thermistor (device for which resistance changes according
to temperature) and humidity sensing element (device for which resistance
changes according to humidity).
CONTROLLER FAN
Discharges heat of the CONTROLLER PWB to prevent temperature of the
CONTROLLER PWB from rising excessively.
CONTROLLER PWB
Receives data from the host, prints and controls the entire printer.
Revision C
2-42