cutmaster 102
Manual 0-4998 5-19 SERVICE
a) Measure for 12VDC between J2-1 to J2-2 on
PCB 2. If no voltage is present , replace Capaci-
tor PCB 2.
2. Open connection between Capacitor PCB 2 J2 and
40A PCB 5 J3.
a) Verify connectors are plugged in.
Check continuity
3. Open connection between Main PCB 1 J13 to 40A
PCB 5 J4.
a) Verify connectors are plugged in. Check con-
tinuity
b) Measure voltage at J4-2 to J4-10 on 40AMP PCB
5 for 12VDC. The voltage should drop to less
than 2vdc after a START signal is active. If the
12VDC is not present or does not drop to less
than 2VDC after a START signal is activated,
then replace the ribbon cable.
4. Defective 40AMP PCB 5
a) Measure the voltage between J1-1 to J1-2 on
the 40AMP PCB 5 for 12VDC after the START
signal is activated. If 12VDC is present replace
40AMP PCB 5.
5. Defective Fans MOT2 and 3.
a) If 12VDC is resent on J1 and J2 connectors on
40A PCB 5, replace fans MOT2 & MOT3.
5.09 Main Arc and Controls
Problems
A. Main arc will not establish, LED D59 on
Main PCB remains on while pilot arc is
striking the work piece.
1. Work Cable not connected.
a) Connect cable to work piece
2. Work cable open / broken.
a) Check continuity of work cable. Insure connec-
tion of cable to clamp is secure.
B. Main arc transfers but current cannot be
adjusted.
1. Defective Logic PCB 3.
a) While main arc is transferred,measure voltage
on Main PCB between test points GND1 to
I_DMD1.
b) Adjust CURRENT CONTROL POTENTIOM-
ETER from maximum to minimum. Voltage
should vary from 4VDC at max to 1 VDC at
min
If voltage does not vary with CURRENT CONTROL
POTENTIOMETER, Replace Logic PCB 3.
2. Defective Main PCB 1.
a) Replace Main PCB 1.
C. In LATCH mode, when the torch switch is
released the arc shuts off immediately.
1. Defective Logic PCB`3
a) Replace Logic PCB`3
D. With CURRENT CONTROL
POTENTIOMETER set at maximum, output
current is only 60 amps.
1. Tip is touching the work piece, Drag mode.
a) Lift tip off work piece
2. Defective Pilot IGBT on Main PCB 1
a) Check per section 4.10I
3. Open Sync cable between J14 on Main PCB 1 and
40Amp PCB 5.
a) Check continuity and replace if open..
4. Open ribbon cable between Main PCB 1 and logic
PCB 3.
a) Check continuity.
5. Defective 40Amp PCB 5.
a) Replace 40Amp PCB 5
E. In RAPID AUTO RESTART mode, with
torch switch closed, the pilot does not
start immediately when the cutting arc
extinguishes
1. Defective Logic PCB 3
a) Replace Logic PCB 3
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