Epson LX-300 Service Manual

LX-300 Service Manual
Ttvubleshooting
Motor
>onnector
Number
CR Motor
Assembly
(CN2)
PF Motor
Assembly
(CN3)
CS Motor
Assembly
(CS Board
Assembly)
Table 5-4. Motor Coil Resistance Test Points
Common
Pin
Number
3,4
3,4
5
sensor Connector
Number
HP sensor (CN7)
PE sensor (CN6)
Release Lever
Position Sensor
(CN3)
Color Ribbon
Sensor (CS Board
Assembly)
Test Pin
Number
1,2,5,6
1,2,5,6
Test Method
(Set Meter to Ohms. Disconnect
Motor from Main Board and Check it
with Printer Power Off.)
Place one lead on pin 3 or 4 and the
other lead on each of the 4 test pins to
check the two motor phases.
Place one lead on pin 4 and the other
lead on each of the two test pins to
check the two motor ~hases.
Place one lead on pin 5 (brown) and
,
256
the other lead on each of the 4 teat pins
,)!
to check the 4 motor phases. (Pin 3 is a
common pin.)
Table 5-5. Sensor Test Points
Test Method
Set Meter to Ohms. Check Printer with
Power Off.)
Place one lead on pin 1 and the other
lead on pin 2. Toggle the sensor position,
Place one lead on pin 1 and the other
lead on pin 2. Toggle the sensor by
inserting and removing a sheet of paper.
Place one lead on pin 1 and the other
lead on pin 2. Change the paper-release
lever position.
Place one lead on pin 1 and the other
lead on pin 2. Toggle sensor position.
Meter Reading
18!2 ~ 7% (at
25° c, 77° F)
56Q * 5% (at
25° C, 77°
F)
150$2 t 5% (at
25° C, 77° F)
Method Reading
Meter should toggle between
open and short. (Closed
= active.
Meter should toggle between
open and short. (Open
= active.)
Meter should toggle between
open and short. (Open
=
continuous paper.)
Meter should toggle between
open and short. (Open
= active.)
Table 5-6. Error State Indication
Error Indication
I
Error Status
I
Cause
The printer beeps (...)
and the PAUSE light
Paper-out error. Paper is not installed
blinks
. The release Iever is set to the TRACTOR
The printer beeps
(---
) Operating error.
position before the cut sheet is ejected.
and the PAUSE light
. The release lever is set to the FRICTION
stays on
position before the continuous papa
r is ejected.
Fatal enor. Power supply vottage is abnormal.
votes: (*) Theprinterbeeps for l/10ofa second WI”th a l/10-secondpause.
(–) The pnnterbeeps for 1/2 of a second with a l/10-secondpause.
Rev.A
53

Epson LX-300 Specifications

General

Print Method	9-pin impact dot matrix
Interface	Parallel
Paper Handling	Friction feed, tractor feed
Weight	4.4 kg
Operating Environment	Temperature: 5 - 35°C, Humidity: 10 - 80%