Print Mechanism Components - Epson Stylus PRO 7500 Service Manual

EPSON Stylus Pro 7500

2.2 Print Mechanism Components

The major electrical parts used in the printer mechanism of this printer are as shown below.
Hereafter, we will explain each printer mechanism focusing on these parts.
Table 2-1. Printer Mechanism Components
Part Drive voltage
Carriage components
+42VDC,
B printhead
+28VDC,
C printhead
-2VDC
Head thermistor +5VDC
CR motor +42VDC
CR_HP sensor +5VDC
CR encoder sensor +5VDC
+42VDC,
Pump motor
(PG adjustment)
+5VDC
PG (HD_SLID) sensor +5VDC
P_Edge sensor +5VDC
Cutter solenoid +28VDC
Operating Principles
Description
B/C/M printhead,
LC/LM/Y printhead
One in each printhead, B and C
DC motor
Photo interrupter
active= CR out of HP
interrupted = CR in HP
Linear encoder
two channel A phase/B phase
4 phase 200 cycle HB type stepping
motor with internal encoder sensor
-also used for cleaning
Photo reflector
reflected = in PG HP
unreflected = out of PG HP
Photo reflector
over threshold = paper exists
under threshold = no paper
solenoid, cutter drive
Print Mechanism Components
Table 2-1. Printer Mechanism Components (continued)
Part Drive voltage
Paper feed components
PF motor +42VDC
PF encoder sensor +5VDC
Paper suction fans (x2) +28VDC
P_Front sensor +5VDC
P_Rear sensor +5VDC
P_Thick sensor +5VDC
Paper set lever position
+5VDC
sensor
Ink delivery components
+42VDC,
Pump motor
(cleaning)
+5VDC
Clwaing components
I/C sensors
+5VDC
(B/C/M/lc/lm/Y)
Revision A
Description
DC Servo motor
Rotary encoder
two channel A phase/B phase
in PF motor
DC motor fan
Photo reflector
over threshold = paper exists
under threshold = no paper
Photo reflector
over threshold = paper exists
under threshold = no paper
Photo interrupter
active= thick paper
interrupted = normal paper
Photo interrupter
active= thick paper
interrupted = normal paper
4 phase 200 cycle HB type stepping
motor with internal encoder sensor
also used for PG adjustment
Microswitch 1/ slot
Open = no I/C
Closed = I/C installed
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