TROUBLESHOOTING
4-6
Manual 0-2972
B. Main power line fuses blow immediately after the
ON/OFF Switch is turned on.
1
. Faulty Input Diode
a. Test Input Diode per Subsection 4.10-C; repair
as necessary.
C. Fans do not operate; all control panel indicators OFF
1. Front Panel ON/OFF switch in OFF position
a. Place switch to ON (up) position.
2. Main power disconnect open
a. Close main power disconnect.
3. Torch is not properly connected to Power Supply.
a. Check torch connections to Power Supply.
Tighten or adjust as needed.
4. Shield cup not fully tightened on torch head.
a. Check shield cup for proper installation. Do
not overtighten.
5. Main power line fuses blown
a. Replace main power line fuses.
6. Improper input power cable connections inside Power
Supply
a. Refer to System Schematic and correct if needed.
7. Defective input power cable
a. Replace input power cable.
8. Fuse blown inside Power Supply
a. Replace internal Fuse per Subsection 5.06-A.
9. Line voltage above 10% tolerance (over voltage protec-
tion)
a. Reduce line supply.
Main Printed Circuit Board Layout (logic board not shown)
Art #A-03751
Fuse
(F1)
E1
E2
E3
E12
E11
E22
E35
E4
E13
E15
E16
E5
E20
E7
E19
E8
E21
E18
E10
E9
J1
J2
J5
J9
J3
J23
J4
J22
TP5
TP1
E23
E25
E26
E24
E28
E31
E32
E28
E30
E29
E33
TP13
IGBT
E38
E40
E39
E41
Output
Diode
E6
E27
E37
E43
E42
E36
E17
J21
E34
J20
E14
J26
J8
LT1
J18
J19
TP2
TP10
TP18
TP14
