Unit And Parts Check - Epson LX-300+II RTP Service Manual

EPSON LX-300+II/300+II RTP/1170II

3.2.4 Unit and Parts Check

This section describes the checking method of the printhead, motors and sensors to find the
defective units and parts.
When repairing the unit, make sure to turn the printer off and plug
W A R N I N G
off the power cable except when this manual specifies to keep the
power on.
3.2.4.1 Printhead Check
By measuring the direct current resistance of the printhead coil, you can check if it is all
right.
Table 3-11. Printhead Coil Resistance
Item Operation
1. Set the multimeter to the resistance measuring range.
2. Connect the one side of the probe to C.
Printhead
3. Connect the other side of the probe to corresponding
head pin No.
Figure3-2. Head Coil Pin No.
Troubleshooting
Specification
33.3 ± 3.3Ω
(at 25°C/phase)
Looked From Point A
Troubleshooting
3.2.4.2 Motor Check
By measuring the direct current resistance of the motor coil, you can check if the motor is
all right.
Table 3-12. Motor Check
Item Operation
1. Set the multimeter to the resistance measuring range.
CR motor
2. Connect the one side of the probe to pin 1 or 2.
3. Connect the other side of the probe to pin 3 or 4.
1. Set the multimeter to the resistance measuring range.
PF motor
2. Connect the one side of the probe to pin 1 or 2.
3. Connect the other side of the probe to pin 3 or 4.
1. Disassemble the CS unit.
CS motor
2. Set the multimeter to the resistance measuring range.
(option,
3. Connect the one side of the probe to brown [TBD]
LX-300+II
harness.
only)
4. Connect the other side of the probe to other 4 harness.
Revision D
Specification
4.5Ω ±10%
(at 25°C/phase)
LX-300+II:
12.0Ω ±10%
LX-1170II:
10.6Ω ±10%
(at 25°C/phase)
150Ω ± 5%
(at 25°C/phase)
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