Epson Artisan 800/Epson Stylus Photo PX800FW/TX800FW/Epson Artisan 700/Epson Stylus Photo PX700W/TX700W Revision C
TROUBLESHOOTING Troubleshooting 55
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3.2 Troubleshooting
3.2.1 Motor and Sensor Troubleshooting
Motors
The resistance values for the CR motor and the PF motor are given below, however, the values cannot be used to check the motors status since they are DC motor and the resistance
between the electric poles varies. Visually check the motors for abnormal operation and if it is hard to judge, replace the motor.
Sensors
For the position of each sensor/motor, see 2.1.3 " Motors & Sensors "
(p.49).
Table 3-1. Motor resistance and check point
Motor Motor Type Check point Resistance
CR motor
DC motor with brush
Main Board: Pin1-Pin2 of CN21 19.7 Ω ± 10 %
PF motor Main Board: Pin1-Pin2 of CN22 19.7 Ω ± 10 %
Decompression motor Main Board: Pin1-Pin2 of CN24 88 Ω ± 15 %
Scanner motor Main Board: Pin1-Pin2 of CN49 (TBD) Ω ± 10 %
ADF motor 4-phase, 96-pole PM stepping motor Main Board: Pin1-Pin3, Pin2-Pin4 of CN25 28.0 Ω ± 7 %/phase (25
o
C)
Table 3-2. Sensor check point
Sensor name Check point Signal level Switch mode
PE Sensor
(Transmissive photo interrupter)
Main Board: Pin1-Pin2 of CN9
Less than 0.4 V No paper
More than 2.4 V Detects the paper
Scanner Cover Open Sensor (1)
(GMR sensor)
Main Board: Pin1-Pin2 of CN10
Less than 0.4 V Scanner Open
More than 2.4 V Scanner Closed
Scanner Cover Open Sensor (2)
(GMR sensor)
Main Board: Pin2-Pin4 of CN10
Less than 0.4 V Carriage: at HP
More than 2.4 V Carriage: at the origin position (where the carriage touches the right frame)
PW Sensor
(Reflective photo interrupter)
Main Board: Pin1-Pin3 of CN6
0 V (for reference only) No paper
3.3 V (for reference only) Detects the paper
Duplex Unit Sensor
(Mechanical contact points)
Main Board: Pin1-Pin2 of CN13
Less than 0.4 V Duplex Unit attached
More than 2.4 V No Duplex Unit
CDR Tray Sensor
(Mechanical contact points)
Main Board: Pin1-Pin2 of CN14
Less than 0.4 V Detects CDR Tray
More than 2.4 V No CDR Tray
Photo Tray Sensor
(Mechanical contact points)
Main Board: Pin1-Pin2 of CN12
Less than 0.4 V Photo Tray in use
More than 2.4 V Photo Tray retracted
EJ Cover Open Sensor
(Electromagnetic plunger)
Main Board: Pin1-Pin2 of CN19
Conducting Hold
Breaking Open
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