
Integrated Valve
Section 7: Troubleshooting
Page 50 of 86
5760-107 Operations Manual Rev C
Print Head Pre-Load Adjustment
Pre-load adjustment is sometimes required, as print head components wear over time.
Pre-load adjustment may be required under the following conditions:
•
Excessive or constant
ink leakage
.
•
Poor print quality in the form of
tails, extra dots, splattering
, or a stuck open valve.
•
Undersized dots
(not correctable by pulse width adjustment) and purge die out (rarely)
are indications of over pre-loading.
NOTE:
If a valve is under pre-loaded, increasing the pre-load can correct the print problem.
If the valve is over pre-loaded, the membrane or solenoid wire may be damaged to the
point where the print head will have to be replaced. Diagraph is not responsible for damage
caused by over adjustment of the pre-load.
The following is the proper procedure for adjusting I.V. print head pre-load with the 1902-
855 Solenoid Adjustment Tool. This procedure is easiest to perform on a bench away from
the line. When replacing a print head, always install the new regulator (supplied with the
print head) and adjust pressure to the correct value.
CAUTION:
Failure to follow these instructions can result in damage to the print head.
1. Make sure ink pressure is correct prior to making any adjustments.
2. Remove print head cover. A label inside the print head cover indicates which bushings
and potentiometers to adjust for each orifice.
3. Remove the rear frame plate by removing the three mounting screws.
CAUTION:
Be careful to support the print head since it is only connected by the solenoid
wires to the driver board after the screws are removed. Allowing the print head to hang by
the solenoid wires can damage the solenoids and/or driver board.
4. Lift the rear frame plate/driver board assembly out of the way to provide access for pre-
load adjustment. Handle the assembly by the rear frame plate.
!
!
Bushing
Mounting
Screws
Summary of Contents for Diagraph IJ3000
Page 2: ......
Page 8: ...Integrated Valve Page iv of iv 5760 107 Operations Manual Rev C ...
Page 10: ...Integrated Valve Section 1 Introduction Page 2 of 86 5760 107 Operations Manual Rev C ...
Page 12: ...Integrated Valve Section 2 Safety Page 4 of 86 5760 107 Operations Manual Rev C ...
Page 22: ...Integrated Valve Section 3 System Components Page 14 of 86 5760 107 Operations Manual Rev C ...
Page 60: ...Integrated Valve Section 7 Troubleshooting Page 52 of 86 5760 107 Operations Manual Rev C ...
Page 76: ...Integrated Valve Appendix C Parts and Supplies Page 68 of 86 5760 107 Operations Manual Rev C ...