Troubleshooting Based On Your Printout; Dot Missing - Epson Stylus Pro 7600 Service Manual

EPSON Stylus Pro 7600/9600

3.3 Troubleshooting Based on Your Printout

This section describes conceivable print quality problems that may occur with this
printer and the troubleshooting points for those errors.
Table 3-29. Diagnosing trouble based on printout
Item Description
1

Dot missing

2 Uneven printing/poor resolution
3 Smudged or marred printout on front side
4 Smudged or marred printout on reverse side
5 White/black banding
3.3.1 Dot Missing
If the printer is kept for a long time without being used, the viscosity of the ink on the
nozzle surfaces of the print heads, and in the nozzles themselves, increases, and may
cause skipping of dots during printing. In such cases, execute
SelecType mode first (execute several times). If normal printing is not recovered even
after this power cleaning, check the following particulars.
Execute powerful cleaning of the ink head.
1. Execute Initial filling (p.259) or [KK2] cleaning.
Execute "Initial charge or [KK2]" in the
diagnostic Function (p.220).
(Power OFF→[Paper Feed ∆]+[Paper Feed ∇]+[Cut/Eject]
→Power ON) → "Cleaning" → "Init.Fill"
2. Nozzle Check Pattern Printing (p.45)
Execute "Nozzle Check Pattern Printing" in the SelecType menu.
([SelecType] → "TEST PRINT MENU" → "NOZZLE CHECK")
In initial filling, a large amount of ink will be discharged into the
C H E C K
Maintenance Tank. Therefore, check the counter indication
P O I N T
(remaining value) beforehand. (If deemed necessary, prepare
another Maintenance Tank as a spare.)
Troubleshooting
Refer to
p.147
p.148
p.148
p.149
p.149
Power cleaning (p.60) in
Cleaning (p.259) menu of Self-
Troubleshooting Based on Your Printout
The actions above do not work to recover the printer, check the following points:
If trouble occurs in all the ink colors:
• Are the print heads and cap assemblies sealed during ink filling?
• If the cap assembly / pump tubes have come off.
• If the life of the cleaning unit has expired.
• If the gear train between the pump motor and pump unit has been assembled
improperly.
• If the cap assembly has failed.
(The tension spring has come off, the cap rubber is damaged, etc.)
• If the pump unit has failed.
(The tubes are crushed, etc.)
If the trouble occurs with a specific ink color:
• Abnormal connections between the ink cartridge, ink holder, tube, damper,
print head.
(Fastening nuts loose, or the O-ring deformed or damaged, causing ink to
leak, etc. could occur.)
• Print head failure
If the trouble still has not been recovered from with the items up to this point,
replace the following electric system related parts and check again.
• Check the connections to the CR cable (FFC long) and if there is any damage
to it or not.
• Check the connections to the head cables (FFC short; x 2), and if there is any
damage to them or not.
• MAIN Board
If you replace the MAIN board or the print heads, the
C A U T I O N
connection state of the connection cables (FFC) should be
checked. Particularly in cases where the connector is inserted
at a slant, etc., when the power is turned on, it could cause
destruction of the circuit and the insides of the heads, so
sufficient caution should be exercised.
Revision A
147