Epson Stylus Color 1520 Service Manual page 118

5.1 General Description
This section describes procedures for isolating the unit failure in 2 levels: unit level troubleshooting and
component level troubleshooting. Refer to the flowchart below to isolate the defective unit and perform
repairs at the component level. Table 5-1, Table 5-2 and Table 5-3 show coil resistance for the CR motor and
PF motor, sensor status, and error codes and solutions.
Repair of the
C172 PSB/PSE board
Table 5-1. Coil Resistance for Motors
Motor Connector
No.
CR motor CN14
PF motor CN15
Troubleshooting at the Unit Level
Repair of the
C211-B MAIN board
Disassembly and Adjustment
Figure 5-1. Troubleshooting Flowchart
Test Method
(Set the multimeter to Ohms. Unplug the
Test Pin No.
power cable from the AC inlet and disconnect
the harnesses from the main board.)
Common pin: 5 Place one lead to pin 5 and the other to test
Test pins: 1, 2, 3, pin 1, 2, 3, or 4 to check the coil resistance for
and 4 each phase of the motor.
Pins 1 and 3 Place one lead to the Pin 1 or 2 and the other
or 2 and 4 to pin 3 or 4 to check coil resistance of the
motor's second phase.
START
Repair of the
M-4I60 printer mechanism
END
Troubleshooting
Meter Reading
5Ω ± 7%
at 77°F (25°C),
per phase
10Ω ±10 %
at 77°F (25°C),
per phase
5-1