EPSON Stylus COLOR C70/C80
Revision A
Troubleshooting
Overview
94
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 (dur-
ing 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 3-22. ASF Abnormal 2
Step
Check Point
Remedy
Planetary Gear
Gear 1
Gear 2
Drive Gear
Transmission Gear
Planetary Gear Set
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.
Table 3-22. ASF Abnormal 2
Step
Check Point
Remedy
Tension Spring
Clutch
Inner Gear
Outer Gear
Summary of Contents for Stylus Color C70
Page 1: ...EPSONStylusColorC70 C80 Color Inkjet Printer SEIJ01 004 SERVICE MANUAL ...
Page 5: ...Revision Status Revision Issued Date Description A July 31 2001 First Release ...
Page 9: ...C H A P T E R 1 PRODUCTDESCRIPTION ...
Page 35: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Page 60: ...C H A P T E R 3 TROUBLESHOOTING ...
Page 96: ...C H A P T E R 4 DISASSEMBLYANDASSEMBLY ...
Page 137: ...C H A P T E R 5 ADJUSTMENT ...
Page 169: ...C H A P T E R 6 MAINTENANCE ...
Page 182: ...C H A P T E R 7 APPENDIX ...
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