B-6
Problem Probable Cause Suggested Solutions
Breaker trips when the system is
activated.
Shorted power FET on amp Identify the amp with the problem [FB:
CUT, PINPOINT or SE: SPRAY, ABC].
Use a DVM to measure continuity of
each FET.
Keyboard switches not work
-
ing - indicators or modes do
not change when switches are
pressed.
Front Panel Overlay bad. Disconnect harness from J1 - Use a
jumper to short pins 1 thru 4 to pins
5 thru 8 on J1 independently. If front
panel indicators change, the overlay
switches have failed.
Switch scanner failed.
Err 386 Have a Tone but get a Tone error any
-
way.
T_MON signal failed (A5).
No RF Output Open Relay (A10). Test for RF from each active jack in both
Cut and Spray. No output from any
mode - bad PP relay/driver. No output
Relay Driver failed (A5).
ABC mode will not initiate Over-voltage circuit active. Recalibrate ABC over-voltage.
U7 failed (A4) - If J4-23 (spare) is high,
then the pulse width or duty cycle has
failed.
U4 (A4): without a load, U4-8 & U4-
9 should toggle high. U4-16 should
remain low.
Spray mode will not deliver
power.
Pulse width or duty cycle failure. U7 failed (A4) - If J4-23 (spare) is high,
then the pulse width or duty cycle has
failed.
Blowing fuses or R19 on A7
gets too hot.
Q8 shorted (A7). Q8 drain should equal +HV during
activation.
High Voltage (> 205VDC) MT1 or MT2 failed. If only high for Cut or Spray, check for
failed triac.
Control Loop failed. A control loop failure if high for all
modes and for all dial settings when the
unit is activated.
Flow rate is too high. Shorted driver Q2 (A1) Q2 emitter voltage should increase as
flow increases.
Control loop failed (A1).
Argon hoses from the 5-way tee to
the differential pressure transducer are
reversed.
Intermittent activation using a
handcontrol.
RF Output jacks worn out. Replace jacks.
Dual Pad - Monitor Set will not
lock
• Resistance on PP receptacle <10
ohms
• Monitor set switch on overlay failed
• Confirm resistance >12 ohms
• Test to see if any other panel switches
have failed.
• Recalibrate A.R.M.
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