Epson Stylus Pro 7400 Service Manual page 312

EPSON Stylus Pro 7400/7800/9400/9800
7. Open the Valve No.1 and push the piston head of the syringe.
8. Verify that the value displayed on the gauge is within the range of 36 to 42
kPa.
9. Close the Valve No.2. Write down the value displayed on the gauge after the
Valve No.2 is closed, and leave the jig for about three minutes.
10. Compare the value displayed after a lapse of three minutes with the value
written down in Step 9. A difference within 0.4 kPa is judged as OK (no air
leaks). A difference greater than 0.4 kPa is regarded as an evidence of air
leaks. Check the Damper joint for looseness or any other abnormalities, and
correct it if necessary. Then perform
11. After verifying that the difference is within 0.4 kPa, open the Valve No.3 to
reduce the pressure inside the jig.
12. Disconnect the Measurement Cartridge from the Ink Cartridge Slot after the
gauge displays 0.0 kpa.
13. Put the seal cap onto the Measurement Cartridge.
Perform the above air leak check for each of the all Ink Cartridge Slots of the
printer.
14. When the air leak check of the all Ink Cartridge Slots is completed, press the
green button on the gauge for four to five seconds to turn the gauge OFF.
15. Close the Valve No.1, No.2 and No.3.
Adjustment
Step 4 to 10 again.
Mechanical Adjustment
Should be within the range of 36 to 42 kPa.
Valve No.2 (open) Valve No.3 (open)
Syringe with its piston pushed fully
Figure 5-21. Air Leak Check (2)
Revision B
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