Epson Stylus Color C70 Service Manual page 94

EPSON Stylus COLOR C70/C80
Table 3-22. ASF Abnormal 2
Step Check Point
2. When the ASF is driven in the reverse direction to paper feeding (dur-
1 Does noise
ing hopper reset and back feeding), check that the planetary gear
occur in the
(Cont.)
always lifts up.
ASF just as
[Analysis points]
the paper is
A.The photograph shows the planetary gear lowered, and the lever of
being fed?
the planetary gear set is obstructing the ASF change lever, so that the
Does noise
planetary gear cannot move from this position regardless of whether
occur during
the motor is running in forward or reverse.
hopper reset
B.However, when the carriage contacts the ASF change lever, the lever
when the ASF
of the planetary gear set is released, so that the planetary gear is
is driven in
lifted up (yellow arrow).
the reverse
C.At this time, the LD roller shaft is double driven by gear 1 and by
direction to
gear 2 which is hidden behind gear 1.
paper
D.In this case, the gear that drives gear 1 is the planetary gear, and the
feeding?
gear that drives gear 2 is the transmission gear.
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.
Troubleshooting
Remedy
Gear 1
Planetary Gear Set
Gear 2
Drive Gear
Planetary Gear
Table 3-22. ASF Abnormal 2
Step Check Point
2 Does the PF [Check for disconnected clutch (tension) spring]
motor operate
While referring to the photograph below, check that the tension spring
without the
is attached correctly to the clutch gear inside the ASF unit. To check,
LD roller
turn off the power and turn the timing belt that is attached to the pinion
inside the
gear of the PF motor. At this time, you must move the ASF change lever
ASF unit
manually so that it is in the same position as if the carriage is pressing
rotating
against it. This check can be carried out by looking into the left side of
regardless of
the ASF unit from the right side of the printer with just the upper case
the ASF
removed.
control
[Explanation]
operations?
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.
Overview
Revision A
Remedy
Tension Spring
Inner Gear
Outer Gear Clutch
94