APPENDIX B : COMPRESSOR DRIVEN AIRDRYER
B--20 20950 Issue 1 April 98
FAULT FINDING AND REPAIR
TheairdryerPCBcontainsaswitch andlinkswhichshouldbesetason
Pg. B--31, see also service diagrams on Pg. B--41.
Fault Diagnosis
The following tables are provided for help in fault finding.
Air Pressure Faults
FAULT POSSIBLE CAUSE ACTION
No flow at print
head.
Kink or loose
connection in tubes
connecting airdryer
to printer.
Check air flow from
dryer.
Check tubes and
connections.
Needle valve closed
or blocked.
Clean and/or adjust
needle valve.
Filter blocked. Check filter between
Peltier assembly and
regulator.
Check compressor filter.
Compressor faulty. Check for electrical
supply failure.
Check for mechanical
failure.
Solenoid valve
permanently open
or leaking.
Check solenoid valve.
Check solenoid valve
wiring.
Check solenoid control
from PCB -- set LK2 to
position 1--2 and check
operation every 6 secs.
Reset to position 3--4.
Air leak in system. Check for split tubes,
broken or loose
connections.
PRV permanently
open.
Clean or replace PRV.
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