Manual 0-2470 59 CUSTOMER/OPERATOR SERVICE
5.07 POWER SUPPLY TROUBLESHOOTING (continued)
SYMPTOM POSSIBLE CAUSE REMEDY
A. AC indicator not lit.
B. AC indicator lit. TEMP
indicator red
C. AC indicator lit, TEMP
indicator green, PIP
indicator not lit
1.Input power not properly
connected to input panel
2.Input power selection does
not correspond to actual
input voltage
3.Input fuse blown
4.Faulty LDD PC board*
1.Unit is overheated
2. Fan not running (or
airflow obstructed)
3.Faulty LDD board*
1.Torch not properly con-
nected to power supply
2.Shield cup not properly
installed on torch
3.Faulty PIP assembly in
torch holder
4.Faulty pins inside torch
quick disconnect
1.Check that input power is
present and properly
connected (see Electrical
Connections, page 20)
2.Check actual line voltage
vs. voltage selection on
rear panel (see Electrical
Connections, page 20)
3.Check fuse on inside of
rear panel. If blown,
doublecheck voltage
selection and replace fuse.
If fuse blows again, return
unit to a service station
4.Check and replace if
necessary (see Service
Procedures, page 66)
1.Make sure the unit has not
been operated beyond 70%
duty cycle limit
2.Check for obstructed air
flow (see Service Proce-
dures, page 67)
3.Check and replace if
necessary (see Service
Procedures, page 66)
1.Check that quick discon-
nect is properly attached
2.Check that shield cup is
fully seated against torch
head (do not overtighten)
3.Check PIP assembly (see
Servicing Torch Head
Components, page 44)
4.Check for continuity
between pins 1 and 6.
Check that pins in either
half of quick disconnect
are not pushed back. See
Figure 5-H (page 55)
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