EPSON Stylus Color 900

 

 

Revision C

Table 3-31. Cleaning does not Solve the Print Problem (continued)

Table 3-32. Cleaning does not Solve the Print Problem (continued)

 

 

 

 

 

 

 

 

 

Step

Check Point

Action

 

Step

Check Point

Action

 

 

 

 

 

 

 

 

 

 

6

Is any ink tube

Referring to the figure below, check the following

8

Is the head driver

If you see the C265 Main board from the heat sink

 

 

disconnected from

points:

 

transistor defective?

side, the following four power transistors can be

 

 

the cap unit?

• Connection between two tubes and the bottom of

 

 

found:

 

 

 

the cap (Remove the whole cap from the unit to

 

 

• Q3 and Q4: Outputs the common voltage for the

 

 

 

check the connection.)

 

 

row A and B (black nozzle rows)

 

 

 

• Connection of each tube and the separator.

 

 

• Q5 and Q6: Outputs the common voltage for the

 

 

 

• Connection of one tube at the bottom of the valve

 

 

row C, D, and E (color nozzles)

 

 

A p p ly in g / r e le a s in g

 

To check if each pair transistor is working properly,

 

 

 

check the trapezoid waveform at the emittor terminal

 

 

t h e m in u s p r e s s u r e

 

 

of the charging side (Q3 and Q5). Check the

 

 

L e f t

t u b eI n k

a b s o r p t io n

 

 

( s e m it r a n s p a r e n t )

 

waveform while running a print.

 

 

 

 

R ig h t

t u b e

 

T H H e a t

 

 

C W

 

( w h it e )

 

 

 

 

 

 

 

Q 4 Q 3 Q 6 Q 5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B 1 3D8220B8123D8220 8 2

 

 

S e p a r a t o r

 

 

B +

E

 

 

C C W

 

 

 

 

 

 

+

 

 

 

 

 

 

T r

f o r

Ttrh ef o r

 

 

 

 

 

 

 

 

 

 

 

 

 

 

b la c k

ncoozloz ler

7

Is the FFC

Remove the printhead unit from the carriage unit, and

 

 

 

 

 

disconnected from

bring the printhead surface side upward to check that

 

 

 

 

 

the printhead

two FFC is properly connected. Even though no slant

 

2 02V

 

 

board?

connection nor disconnection is found, disconnect

 

 

 

 

 

 

the FFC once and install them again.

 

 

 

 

 

 

 

 

 

 

 

 

NOTE: Frequency of waveform and voltage level

 

 

F F C

2

F F C

1

 

(p-p) varies if printing is performed through

 

 

 

 

 

 

 

the driver. Therefore, as long as the

 

 

 

 

 

 

 

trapezoid waveform is output, the head

 

 

 

 

 

 

 

driver IC is considered good, and the

 

 

 

 

 

 

 

printhead must be replaced in that case.

Troubleshooting

Overview

97

Page 97
Image 97
Epson SEIJ98006 manual Cleaning does not Solve the Print Problem

SEIJ98006 specifications

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