Overview; Main Component Checking Point - Epson FX 890 - B/W Dot-matrix Printer Service Manual

3.1 OVERVIEW

The printer may exhibit different symptoms for the same problem, which makes troubleshooting
more difficult. This section, however, provides simple and effective ways to facilitate
troubleshooting. The following flowchart illustrates the main steps of the troubleshooting process.
Unit Repair of the
C229PSB/PSE/PSH
Board

3.1.1 Main Component Checking Point

The following components can be checked by a simple measurement equipment such as a multi-
meter, etc.) easily.
Motor
Connector
Number
PF Motor 1 and3, 2 and 4
(CN8)
CR Motor Common pin : 5
(CN9) Test pins : 1, 2, 3
and 4
Rev. B
Unit Level Troubleshooting
Unit Repair of the
C229MAIN Board
Assembly and Adjustment
Figure 3-1. Troubleshooting Process Flowchart
Table 3-1. Motor Coil Resistance Test Points
Test Pin
Number (Set Meter to Ohms. Disconnect
Motor from Main Board and check it
Place one lead on pin 1 (pin2) and the
other lead on pin3 (pin 4) on each of the
test pins to check the two motor phases.
Place one lead on pin 5 and the other
lead on each of the 4 test pins to check
the two motor phase.
FX-1180/FX-880 Service Manual
START
END
Test Method
with Printer Power off.)
Chapter 3 Troubleshooting
Unit Repair of
M-3J10 Mechanism
Meter Reading
16.0
(at 25 C par one
phase)
2. 7
(at 25 C par one
phase)
10%
10%
3-1