Epson Stylus Color C70 Service Manual page 78

EPSON Stylus COLOR C70/C80
Table 3-10. Countermeasures when a fatal error occurs
Step Check Point
5 Is CN8 (FFC) on CN8 on the main board is a connector that transmits the
the main board feedback signal from the carriage encoder to the main board as
disconnected or well as transmitting the head drive signals. Accordingly, if this
almost connector is disconnected, the result is the same as if there is a
disconnected? malfunction of the carriage encoder.
6 Is there a Use an ohmmeter to check the resistance value of the coil inside
malfunction of the carriage motor.
the CR motor? Resistance value: 23.3 ohms +/- 15% (DC)
NOTE:Look carefully at the whole of the coverings of the two
harnesses, and make sure that there are no holes
anywhere in the coverings. If a hole is found anywhere,
measure the internal coil resistance and replace just the
harness if the resistance value is normal. (However,
none of the harnesses for the spare parts motors are
supplied as single parts.)
Troubleshooting
Remedy
Overview
Table 3-10. Countermeasures when a fatal error occurs
Step Check Point
7 Is there a Use an ohmmeter to check the resistance value of the coil inside
malfunction of the paper feed motor.
the PF motor? Resistance value: 23.3 ohms +/- 15% (DC)
NOTE:Look carefully at the whole of the coverings of the two
harnesses, and make sure that there are no holes
anywhere in the coverings. If a hole is found anywhere,
measure the internal coil resistance and replace just the
harness if the resistance value is normal. (However,
none of the harnesses for the spare parts motors are
supplied as single parts.)
8 Is there a If the pins of IC8 are blackened, the main board and the motor
malfunction of must both be replaced at the same time. Furthermore, in order to
the motor driver determine which motor, check the internal coil resistance of the
IC (IC8) on the motors as described in step 7 above, and replace whichever
main board? motor does not give a normal resistance value measurement
(energization not possible, or abnormal current flow due to
short). In addition, if there are no visible problems with the IC,
replace the main board and then check the operation.
NOTE:When the main board is replaced, several adjustments
must be carried out, so refer to the "Adjustment" and
"Disassembly" sections for details on carrying out these
adjustments correctly.
9 Is there a Replace the junction board that the encoder is mounted on, and
malfunction of check operation.
the PF motor
encoder (photo
sensor)?
Revision A
Remedy
78