O4: Lf Driver Error; O5: Cr Error - Epson DFX-9000 Repair Manual

Epson DFX-9000 Field Repair Guide

O4: LF Driver Error

Cause: Abnormal current to the LF Motor or one phase of the LF Motor was energized for too long a time period.
Action:
1. Test all four (4) windings of the LF Motor (Line Feed Motor) with an ohmmeter
of the LF Motor should have 0.5 - 0.6 ohms of resistance. If the resistance is incorrect, replace the LF Motor.
2. Replace the ROM Board.
Note: A weak ohmmeter battery, uncalibrated ohmmeter, and ohmmeter test lead resistance will cause an
inaccurate resistance reading. To obtain an accurate resistance reading, test the LF Motor as follows:
1. Set the ohmmeter on its lowest resistance scale.
2. Short the ohmmeter test leads together and note the value displayed on the ohmmeter.
3. Place the ohmmeter test leads across each of the LF Motor windings.
Subtract the value obtained in Step 2 from the each of the values displayed in Step 3. The result is the actual resis-
tance of the LF Motor.

O5: CR Error

Cause: Carriage Motor deceleration error.
Action:
1. Inspect the Carriage Encoder Sensor (CES Sensor) for debris, physical damage, and proper cable seating in
its connector.
2. Test the Carriage Encoder Sensor (CES Sensor). If there is no toggle, replace the Carrier Unit (Carriage
Assy).
3. Replace the ROM Board.
Troubleshooting Printer Component, Software Item,
(See note
LCD Display, Printer Button
3/29/07
below). Each winding
Page 121.