EPSON Stylus Color 900 Revision C
Troubleshooting Overview 88
3.1.1.5 Remedies for Fatal Error
A fatal error is basically caused by any of the following conditions:
1. The printer does not detect the carriage in the home position.
2. The printer does not detect signals from the linear scale.
3. The ASF sensor does not detect the ASF home position.
The following tables show various causes of the error and
corresponding solutions. Be sure to follow the steps correctly to solve
the problems.
NOTE: If the finding for the question is Yes, take the action described in
the right column. If “No”, proceed to the next step.
Table 3-13. Remedies for Fatal Error
Table 3-14. Remedies for Fatal Error
Step Check Point Actions
1 Has the CRHP
sensor come off the
printer mechanism
frame?
Is the connector for
the CRHP sensor
disconnected?
Check the CRHP sensor visually. Connect the
connector properly. Make sure the connector is
connected to the indicated position on the relay
board. Also, check that there is no dust nor paper
debris between the sensor parts.
2 Has the encoder belt
come off?
Referring to step 2 in Section 3.1.2.2, check that the
encoder belt is set between the sensor parts. Also
check that the sensor is free from dust and paper
debris.
M/C
M/C
CRH PE ASF
RED
WHT
BLK
M/C
Connector 1
Connector 2
M echanism
Frame
Step Check Point Actions
3 Has the ASF sensor
come off?
Is the sensor for the
ASF disconnected?
Referring to the figure below, check that the ASF
sensor is attached to the correct position.
Check that both connectors 1 and 2 are securely
connected.
4 Has the coil for the
CR motor burnt?
Since the CR motor is controlled by the Bipolar
system, measure the coil resistance using the tester
as shown below.
<Resistance: 5.8
Ω
±
10%>
Note: Be
sure to
measure the
resistance at
two points
shown in the
figure below.
5 Has the coil for the
PF motor burnt?
Measure the internal coil resistance of the PF motor
in the same manner as for the CR motor.
<Resistance: 8.1
Ω
±
10%>
M/C
M/C
CRH PE ASF
RED
WHT
BLK
M/C
ASF Sensor
ASF Fram e
(Left)
Connector 1
Connector 2
To Pin 1
To Pin 3
Step 1
Step 2
To Pin 2
To Pin 4
CR Motor
