Epson Stylus Pro 5000 Service Manual page 67

Stylus Pro5000
Table 3-2. Phenomenon:
Cleaning does not solve the problem in print quality. (Continued)
Step
7 Remove the upper case and then the cover on the carriage.
(Refer to Chapter4)
8 Check the damper inserted in the needle for each color. If it is
loose, fix it securely.
9 Check that hexagon nuts connecting the pipes and ink supply
tubes for all colors routed out to the front side of the printer are
securely tightened.
10 Check that the hexagon nuts securing the ink supply port at the
back of the ink cartridge holders are securely tightened.
11 When the printhead is at the home position, check the rubber on
the cap and the head surface, which should be in tight contact
with each other, for the correct position. If they are not properly
positioned, following conditions can be assumed:
T
Lack of parallelism due to bad repair or severe shock.
T
Incorrect engagement of the parts around the cap, such as the
spring dislocated and the cap supporting shaft unhooked.
T
Ink tube has come off or deformed.
T
Small concavities on the cap rubber surface
12 Using the tester, check the signal change in on and off for that
the detected signal is properly fed back from the ink out sensor.
13 Head driver common voltage and the nozzle selector control
signals may not be sent to the printhead. Therefore, check that
the FFCs are correctly connected to CN10 and CN11 on the
C228 DRV board.
14 Check that the FFCs for the printheads are correctly connected.
If it is not connected completely, there is a possibility that excess
current already flew into PZT in the head, damaging the head.
15 Waveform for the head driver voltage output from the C228DRV
board may be abnormal. Therefore, replace the C228DRV board.
16 C228MAIN board may be bad. Replace the C228MAIN board.
17 If the problems is not solved through the steps, replace the
printhead.
Rev. A
Remedy
WARNING Mind that 2 printhead used for the printer, the dark
color version (left) and light color version (right),
have different ordering codes. Therefore, be sure
to install the head of the correct code, as a wrong
head has a direct effect on print quality.
Table 3-3. Phenomenon:
Printer ejects ink but prints badly.
Step
1 When the printer ejects ink in a improper direction, that
condition is considered "improper alignment". The possible
causes other than head clogging are failure in any of the
following adjustments:
Bi-D adjustment,
Head angle adjustment,
Referring to Chapter 5, print a check pattern to see the current
adjustment condition.
WARNING The adjustments mentioned above must be
performed in the specified order. Make sure that
you perform the adjustments in the order
specified in Chapter 5.
Chapter3 Troubleshooting
Remedy
Head gap adjustment,
Head vertical adjustment
3-2