Epson Stylus Photo 950, Service Manual

Page: 80 / 191

EPSON Stylus PHOTO 950 Revision A
TROUBLESHOOTING Overview 80
3.1.6.1 PF Motor Driver Abnormal 1
This section describes the procedures for solving the problem when no error occurs,
but only the PF motor operates at high speed all the time even though this has not
happened before. The PF motor is different from the carriage motor in that it does not
generate a fatal error even if the rotary encoder cannot read at all, so that the firmware
checks the bar code signal on the rotary encoder and continues providing current to the
PF motor, causing it to operate at high speed. The methods of solving this problem are
given below in order starting from the easiest, so refer to them for the checking and
working procedures.
3.1.6.2 ASF Driver Abnormal 1
This section describes the procedures for solving the problem when no error occurs,
but the ASF is not driven at all even though the PF motor operates normally. This
problem occurs because the ASF and the printer mechanism are not engaged correctly.
The methods of solving this problem are given below in order starting from the easiest,
so refer to them for the checking and working procedures.
Table 3-15. PF Motor Driver Abnormal 1
Step Check Point Remedy
1 Is the rotary scale not
moving in between the PF
encoder (photo coupler)
parts?
(or is there a problem
around the photo sensor?) If the rotary scale is not inside the photo sensor, a fatal
error will occur. Check if the condition is as shown in the
illustration below or not. If the rotary scale is not inside
the photo sensor, re-adjust the rotary scale so that it is
inside the photo sensor. Furthermore, check if the
connector that transmits the signal from the rotary
encoder to the main board is disconnected.
2 Check if CN8 (white: 4-
pin) on the main board is
disconnected. CN8 on the main board is a connector that transmits the
feedback signal from the PF encoder to the main board.
Accordingly, if this connector is disconnected, the result
is the same as if there is a malfunction of the PF encoder.
3 Is there a malfunction of
the photo coupler junction
board? Replace the junction board shown in the above
photograph and then check the operation.
Rotary Scale
Photo Coupler
Check Point 1
Check Point 2
Table 3-16. ASF Driver Abnormal 1
Step Check Point Remedy
1 Is the ASF
installed
correctly to the
printer
mechanism? Check all of the following points.
1. Is the ASF change lever protruding from the cut-away part at
the front of the mechanism?
2. Are the two protrusions at the left side of the ASF left side
frame correctly visible from the cut-away part of the
mechanism? (If it is not protruding, it needs to be reset.)
Cutting Part
Carriage Motor ASF Change Lever
CR Motor
Protrusion 1
Front View
PF Motor
Protrusion 2
Bottom View
Left Side of the Printer
Mechanism