Epson Stylus Photo 950, Service Manual

Page: 89 / 191

EPSON Stylus PHOTO 950 Revision A
TROUBLESHOOTING Overview 89
1
(Cont.)
Does noise occur in
the ASF just as the
paper is being fed?
Does noise occur
during hopper reset
when the ASF is
driven in the
reverse direction to
paper feeding?
2. When the ASF is driven in the reverse direction to paper
feeding (during hopper reset and back feeding), check that
the planetary gear always lifts up.
[Analysis points]
A.The photograph shows the planetary gear lowered, and the
lever of the planetary gear set is obstructing the ASF change
lever, so that the planetary gear cannot move from this
position regardless of whether the motor is running in
forward or reverse.
B.However, when the carriage contacts the ASF change lever,
the lever of the planetary gear set is released, so that the
planetary gear is lifted up (yellow arrow).
C.At this time, the LD roller shaft is double driven by gear 1
and by gear 2 which is hidden behind gear 1.
D.In this case, the gear that drives gear 1 is the planetary gear,
and the gear that drives gear 2 is the transmission gear.
When paper is being fed and when the power is turned on and
off, double feeding of the ASF is always carried out.
Furthermore, the angle of the above photograph is a view from
the right side of the printer with the ASF mechanism removed,
to allow the mechanism to be checked easily. If the planetary
gear is not lifted up, the probable cause is one of the following.
[Cause 1]
The tension of the spring that applies a load inside the
planetary gear is too strong and the planetary gear cannot lift
up.
[Cause 2]
The friction of the shafts that pass through the planetary gear
set is to strong and the planetary gear cannot lift up.
[Cause 3]
The ASF change lever is not installed correctly, so that even
when the carriage contacts the change lever, it does not move
and so the clutch remains engaged.
Table 3-23. ASF Abnormal 2
Step Check Point Remedy
Gear 1
Gear 2
Drive Gear
Transmission Gear
Planetary Gear Set
Planetary
Gear
2 Does the PF motor
operate without the
LD roller inside the
ASF unit rotating
regardless of the
ASF control
operations? [Check for disconnected clutch (tension) spring]
While referring to the photograph below, check that the
tension spring is attached correctly to the clutch gear inside the
ASF unit. To check, turn off the power and turn the timing belt
that is attached to the pinion gear of the PF motor. At this time,
you must move the ASF change lever manually so that it is in
the same position as if the carriage is pressing against it. This
check can be carried out by looking into the left side of the
ASF unit from the right side of the printer with just the upper
case removed.
[Explanation]
For the check in step 1 above, if the ASF lever is at the normal
position, the LD roller will always rotate when the PF motor
operates regardless of whether ASF control is in progress or
not, even if the clutch tension spring is disengaged. In other
words, the operation is the same as if the carriage is always
pushing against the ASF change lever.B
Table 3-23. ASF Abnormal 2
Step Check Point Remedy
Tension Spring
Clutch Inner Gear Outer Gear