Epson Stylus Photo 950, Service Manual

Page: 73 / 191

EPSON Stylus PHOTO 950 Revision A
TROUBLESHOOTING Overview 73
7 Is there a
malfunction of
the PF motor? Use an ohmmeter to check the resistance value of the coil inside
the paper feed motor.
r esistance value: 30.5ohms +/- 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.)
Table 3-10. Countermeasures when a fatal error occurs
Step Check Point Remedy
8 Is there a
malfunction of
the Pump motor? Use an ohmmeter to check the resistance value of the coil inside
the Pump motor.
Resistance value: /- 10%
NOTE: There are two measurement locations. (See
the figure below.)
9 Is there a
malfunction of
the motor driver
IC (IC9) on the
main board? If the pins of IC9 are blackened, the main board and the motor
must both be replaced at the same time. Furthermore, in order to
determine which motor, check the internal coil resistance of the
motors as described in step 7 above, and replace whichever
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.
10 Is there a
malfunction of
the PF motor
encoder (photo
sensor)? Replace the junction board that the encoder is mounted on, and
check operation.
Table 3-10. Countermeasures when a fatal error occurs
Step Check Point Remedy
1
2
1-pin
3-pin
4-pin
2-pin