Thermal Dynamics CE CutMaster 80XL Service Manual

Manual 0-2725 4-17 SERVICE TROUBLESHOOTING
A-01215
E16
E18
E19
E17
E14
E15
b. Place the meter (+) lead on E16 and the meter (-)
lead on E18 of the FET/Heatsink Assembly to
check the output rectifier forward bias. The meter
should indicate between 0.3 to 0.6 volts using the
diode function or 100K ohms using the ohms func-
tion.
c. Place the meter (+) lead on E18 and the meter (-)
lead on E16 of the FET/Heatsink Assembly to
check the output rectifier reverse bias. The meter
should indicate 'OL' using the diode function or
100K ohms using the ohms function.
d. Place the meter (+) lead on E17 and the meter (-)
lead on E19 of the FET/Heatsink Assembly to
check the output rectifier forward bias. The meter
should indicate between 0.3 to 0.6 volts using the
diode function or 100K ohms using the ohms func-
tion.
e. Place the meter (+) lead on E19 and the meter (-)
lead on E17 of the FET/Heatsink Assembly to
check the output rectifier reverse bias. The meter
should indicate 'OL' using the diode function or
100K ohms using the ohms function.
f. Place the meter (+) lead on E18 and the meter (-)
lead on the heatsink of the FET/Heatsink Assem-
bly to check the output rectifier resistance to
ground. The meter should indicate >1 meg ohms.
Replace the FET/Heatsink Assembly if any of the
above tests are open or shorted.
6. FET Output Clamp Diodes Check
Use an ohmmeter to check the resistance of the out-
put clamp diodes, (+ out) E17 and (- out) E18, per the
following procedure:
NOTE
The wires on E16 and E18 should still be discon-
nected from both FET/Heatsink Assemblies.
a. Place the meter (+) lead on E17 and the meter (-)
lead on E18 of the FET/Heatsink Assembly to
check the output clamp diode resistance. The
meter should indicate >1 meg ohms.
b. Place the meter (+) lead on E18 and the meter (-)
lead on E17 of the FET/Heatsink Assembly to
check the output clamp diode resistance. The
meter should indicate >1 meg ohms.
Replace the FET/Heatsink Assembly if any of the
above tests are open or shorted.

Thermal Dynamics CE CutMaster 80XL Specifications

General

Brand	Thermal Dynamics
Model	CE CutMaster 80XL
Category	Welding System
Language	English