User Manual

38 Troubleshooting
Table 7-3 DJ-9500 Troubleshooting – Component Based
Component Quality Troubleshooting Questions
Seat
Size and
orientation
Is it the correct size? Was it installed in the correct orientation? Does
a new seat have the same behavior?
Nozzle
Size and
cleanliness
Is it the correct size? Was it cleaned completely? Does a new nozzle
have the same behavior?
Stroke
Adjustment
Adjustment
position
Was the Stroke Adjustment Assembly removed? Was the stroke
adjustment set following the procedure? Is the Needle Assembly
worn or damaged?
Retainer
Assembly
Installation
Was a repeatable process used to re-assemble the jet? Was the
retainer firmly tightened? Was the stroke adjustment open to the red
mark when tightened?
Chamber O-
ring
Condition
Was the seal damaged during cleaning? Was the seal replaced?
Does a new seal have the same behavior?
Fluid Seal
Condition
and
Orientation
Is the seal worn or damaged? If being reused, was it cleaned
completely? Was the seal removed/installed using the seal tool (P/N
7201416)? Was it installed in the correct orientation?
Solenoid Operation
Are the electrical connections good – both at the bulkhead and in the
junction box? Is a minimum of 80-psi air being supplied all the way to
the solenoid inlet? Is the solenoid armature actuating (faint ticking)?
Can the solenoid open using the manual override? Is air exiting the
solenoid when operated?
Needle
Assembly
Condition
Is the needle assembly worn or damaged? Check the tip, fluid seal
location and the piston seal. Does the needle assembly move freely
in the jet body with the stroke adjustment assembly removed?
Thermal
Control
Assembly
(TCA)
Operation
Is the heater turned on? Is the heater set to the right temperature?
Does the resistance across the heater and RTD leads meet
specification? Are the heater and RTD leads insulated from the TCA
body? Does cooling air pass through the TCA body? Is the cooling
airflow set properly?
Body Heater Operation
Is the heater turned on? Is the heater set to the right temperature?
Does the resistance across the heater and RTD leads meet
specification? Are the heater and RTD leads insulated from the
body? Does cooling air pass through the Junction Box and Heat
Exchanger body? Is the cooling airflow set properly?