APPENDIX B : A--SERIES AIR DRIVEN AIRDRYER
20951 Issue 1 Apr 98 B--13
FAULT FINDING AND REPAIR
The airdryer has the following indicators.
External Indicators
Power Indicator Normally On
Fault Indicator Normally Off -- flashes in the event of a
pressure failure or excessive humidity
Sounder Normally Off -- gives audible alarm in the
event of a pressure failure or excessive
humidity
PCB Indicators
LED 1 (red) Normally Off -- On indicates pressure failure
LED 2 (red) Normally Off -- On indicates humidity failure
Fault Diagnosis
FAULT POSSIBLE CAUSE REMEDY
No flow at print
head
Air filter, general
purpose filter and/or
oil removal filter
blocked
Replace filter
assembly
Kink or loose
connection in pipes
connecting airdryer to
printhead
Check connections
and tubes. Check for
blockage in airdryer
unit
Needle Valve blocked Clean and/or adjust
needle valve,
resetting to correct
position when
blockage is cleared
Air leak in system Check for split pipes,
broken or loose
connections
Airflow too low Regulator not at 2bar Set regulator to 2bar
and lock adjustment
knob in position
Needle valve not set
correctly
Set to give an airflow
of 2.2L/min
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