Epson LX-850 Specifications download pdf (Page 154)

REV.-A

Table 5-5. Printer Mechanism Repair (Continued)

Problem

Self-test

printing is

abnormal.

‘aper

feed is

jefective.

Symptom

A particular

dot fails to

print.

The printing

is too light, or

the print

density is not

uniform.

Printing is

performed,

but the paper

is not fed, or

is not fed

uniformly.

Cause

The

printhead

is defective.

The

printhead

is defective.

The platen

gap is not

properly

adjusted.

Foreign

substances

are lodged in

the paper

path.

The paper

feed motor is

not driving

the gear

correctly.

The

paper

feed motor is

defective.

Checkpoint

Measure the coil resistance of the

printhead.

The normal value is

approx.

19.2

ohms

Check whether the dot wire broken.

Check whether the tip of the dot wire is not

worn.

Set the gap adjust lever to the second

position, and check the gap between the tip

of the

printhead

and the platen.

The appropriate value is 0.45mm.

Perform a visual check of the paper path.

Check that no foreign substance is lodged

~etween

the gears, and that the gears are not

aroken

or worn.

tleasure

the coil resistance of the paper feed

notor.

rhe

appropriate value is

approx.

40 ohms.

Solution

Replace the

printhead

Replace the

printhead

Replace the

printhead

Adjust the

gap. Refer to

section 4.3.1,

“Platen gap

adjustment”’.

Remove any

foreign

substances.

“

Remove the

foreign

substance.

● Replace the

paper feed

reduction

gear.

● Replace the

platen

gear.

Replace the

paper feed

motor.

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