Motor/Solenoid Internal Coil Resistance; Transportation Motor Check Points - Epson GT-1200 Service Manual

ADF

3.1.2 Motor/Solenoid Internal Coil Resistance

This section provides the check points for the motors which are found
defective through the test modes described in Section 3.1.1.
ü ü ü ü n n n n Since a DC motor is used for the paper
CHECK POINT
feeding motor, check continuity for 2 lines in
case this motor is found defective.
n n n n The reference coil resistance for the DC
motor is 3.4 W W W W . However, do not judge the
motor condition based on the value, because
current is measured to check the motor
condition only.

3.1.2.1 Transportation Motor Check Points

A 4-phase motor is used for the transportation motor. The coil resistance
1.1W ± 10%.
between each coil is
connection of the transportation motor.
The connector is directly soldered onto the transportation motor. See
Figure 3-3 which shows pin configuration appears when the connector is
removed.
Rev. A
Figure 3-2 shows the internal
A
1
R e d
A c o m
3
R o t o r
B l a c k
* A
5
W h i t e / R e d
Figure 3-2. Internal Connection of the Transportation Motor
1 3 5
Figure 3-3. Transportation Motor Pin Configuration
Troubleshooting
B
7
G r e e n
B c o m
9
W h i t e
* B
1 1
W h i t e / G r e e n
7 9 1 1
3-5