Domino A-SERIES, Operation And Maintenance Manual

Page: 328 / 337

APPENDIX B : A--SERIES AIR DRIVEN AIRDRYER
20951 Issue 1 Apr 98 B--19
Humidity Check
CAUTION It is essential that the air flow and humidity are both
checked every 2000 hours to ensure reliable printer
operation.
Note: Airdryer test kit used is 30455
(1) Remove the print head from its holster.
(2) Connect the humidity sample bottle to the 1/4”silicone air tube in
the print head.
(3) Turn on the airdryer.
(4) Set the ThermoHygrometer to monitor Centigrade. Insert the
meter into the neck of the sample bottle and switch the meter on.
(5) Allow the meter to acclimatise fro ten minutes, then note the
temperature and humidity shown in the meter window.
(6) The air temperature should be slightly higher than the ambient
temperature, and the humidity should be slightly less than 22%
Relative Humidity (RH).
Note: During the purge period, when the solenoid valve is open, the
humidity may temporarily increase by up to 5%RH.
Air Flow Check
Notes (1) Airdryer test kit used is 30455
(2) Any instability in the ink jet is unlikely to be due to the air flow,
however, if the air flow rate does interfere with the ink jet, reduce
the air flow (by screwing in the needle) until the interference ceases.
An excessive supply of air into the print head will interfere with the ink
jet, and therefore print quality. Ensure the equipment is running and
check the air supply as follows:
Note: Once the air flow is set up, any instability in the ink jet apparently
due to this air flow will almost certainly result from another cause
and should be properly investigated.
(1) Remove the print head from its holster.
(2) Check the air flow indicated by the meter is between 2.0 and 2.2
litres/minute. If necessary, carefully adjust the restrictor needle to
set the air flow to within these limits. Remove the meter and bottle.