Epson Stylus Pro 4900/Epson Stylus Pro 4910 Revision A
TROUBLE SHOOTING Abnormal Operations 89
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2.8 Abnormal Operations
This section describes the possible trouble on abnormal printer operations and its causes, and their remedies.
Table 2-6. Abnormal Operations
Symptom Cause Check Item Remedy
Abnormal noise when carriage is in
operation
Improper CR belt tension
Measure and check if CR belt tension is within the
standards. (See P.319)
Adjust CR belt tension if it is out of the standard.
(See P.319)
Lack of lubrication on the CR Unit and
the carriage shaft.
Pull CR belt to see if CR Unit moves smoothly.
If it does not move smoothly, lubricate the
following parts.
Carriage shaft (posts, shaft, location where the
CR Unit is attached.) (See P.421)
Oil Pad (See P.421)
CR Scale/CR Encoder is not read
properly
Check the encoding status of the CR Scale. (See P.327)
CR Scale damaged or dirty?
CR Encoder attached properly?
Attach the parts properly if there is any
attachment trouble. (See P.171)
Clean CR Scale with ethanol.
Replace it if damaged. (See P.171)
Abnormal noise in regular intervals while
sending paper
Holder, Roller not attached properly
Holder, Roller is damaged
PF belt tension within standards?
Holder, Roller attached properly?
Any Holder, Roller damaged?
Adjust PF belt tension if not within standards.
(See P.366)
Set the Holder, Roller properly. If the printer
still does not recover, replace the Holder,
Roller. (See P.217)
PF Scale/PF Encoder is not read
properly
Operate PF Encoder and Scale Check. (See P.368)
PF Scale damaged or dirty?
PF Scale attached straight?
PF Encoder attached properly?
Operate PF Encoder and Scale Check. (See P.368)
PF Scale damaged or dirty?
PF Scale attached straight?
PF Encoder attached properly?
Abnormal metallic sound while sending
paper out.
Improper PF belt tension
Measure and check if PF belt tension is within standards.
(See P.366)
Adjust PF belt tension if not within standards. (See
P.366)
PF Scale/PF Encoder is not read
properly
Operate PF Encoder and Scale Check. (See P.368)
PF Scale damaged or dirty?
PF Scale attached straight?
PF Encoder attached properly?
Attach the parts properly if there are any
attachment troubles. (See P.183)(See P.184)
Clean PF Scale with ethanol.
Replace the part if damaged. (See P.183)(See
P.184)
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