Motor Check; Sensor Check - Epson LQ-300 + Service Manual

24 pins serial impact dot matrix printer

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User manual (152 pages)

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101

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105

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Table of Contents

EPSON LQ-300+

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 3-11. Motor Check

Item

Operation

1. Set the multimeter to the resistance measuring range.

CR motor

2. Connect the one side of the probe to 1 or 2 pin.

3. Connect the other side of the probe to 3 or 4 pin.

1. Set the multimeter to the resistance measuring range.

PF motor

2. Connect the one side of the probe to 1 or 2 pin.

3. Connect the other side of the probe to 3 or 4 pin.

1. Disassemble the CS unit.

2. Set the multimeter to the resistance measuring range.

CS motor

3. Connect the one side of the probe to brown [TBD]

(option)

harness.

4. Connect the other side of the probe to other 4 harness.

Troubleshooting

3.2.4.3 Sensor Check

When the sensor is connected mechanically, you can check the sensor by its

conductivity.

Specification

Item

5.7Ω ±10%

(at 25°C/phase)

HP detector

16.0Ω ±10%

(at 25°C/phase)

150Ω ± 5%

RPE detector

(at 25°C/phase)

Release detector

BPE detector

PG detector

Troubleshooting

Table 3-12. Sensor Check

Operation

1. Set the multimeter to the resistance

measuring range.

2. Connect the one side of the probe to

CN3 1 pin.