Symptoms
Code Symptoms XPR models XPR action Code cancels with...
747 The fan speed for CAB FAN 1 is less than the min-
imum acceptable Revolutions Per Minute (RPM)
value.
XPR460
750 The fan speed for CAB FAN 1 is less than the mini-
mum acceptable RPM value.
XPR170,
XPR300
None • Set process
• Remote on-off
Corrective action
1. Use the Fan diagnostic codes diagram on page 368 to identify the location of CAB FAN 1 in the
plasma power supply.
2. Make sure that the following fan connections are good, and tighten loose connections if found:
a. The fan connector
b. The wiring to J7 on the fan power distribution PCB
c. The wiring to J7 on the control PCB
3. Tighten loose connections if found.
4. Examine the 48 VDC power source output.
5. If the power output is not correct, replace the 48 VDC power source.
6. If you do not find any loose connections and the 48 VDC power source is good, replace the fan.
Troubleshooting for phase errors in choppers
Diagnostic codes 752, 753, 754
Diagnostic codes 752 – 754 occur when there is a 3-phase error in a chopper.
Symptoms
Code Symptoms XPR models XPR action Code cancels with...
752 There is a 3-phase error in Chopper 1. All models
753 There is a 3-phase error in Chopper 2. XPR300,
XPR460
754 There is a 3-phase error in Chopper 3. XPR460
Shut down Remote on-off
Diagnostics and Troubleshooting
8
373811530Instruction ManualXPR460
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