Epson LX-300+ Service Manual

LX-300+/1170 Revision C
Troubleshooting
T
roubleshooting 66
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.
3.2.4.1 Printhead Check
By measuring the direct current resistance of the printhead coil, you can check if it is all
right.
Figure3-2. Head Coil Pin No.
W A R N I N G
When repairing the unit, make sure to turn the printer off and plug
off the power cable except when this manual specifies to keep the
power on.
Table 3-10. Printhead Coil Resistance
Item Operation Specification
Printhead
1. Set the multimeter to the resistance measuring range.
2. Connect the one side of the probe to C.
3. Connect the other side of the probe to corresponding
head pin No.
33.3 ± 3.3Ω
(at 25°C/phase)
Looked From Point A

Epson LX-300+ Specifications

General

Emulation	Epson ESC/P, IBM PPDS
Print Method	9-pin, impact dot matrix
Interface	Parallel
Paper Handling	Friction feed
Dimensions	366 x 275 x 159 mm
Paper Width	4 - 10 inches