Lincoln Electric NA-3 Service Manual page 85

F-20
FIGURE F.3 – VARIABLE VOLTAGE
BOARD LED LOCATIONS.
Indicator Lights
Light
No. Location Idle Mode
1A
Ctrl. Bd.
1B
Ctrl. Bd.
1C
Ctrl. Bd.
1D
Ctrl. Bd.
1E
Ctrl. Bd.
2A
Logic Bd.
2B
Logic Bd.
2C
Logic Bd.
2D
Logic Bd.
2E
Logic Bd.
2G
Logic Bd.
2H
Logic Bd.
2J
Logic Bd.
2K
Logic Bd.
2L
Logic Bd.
3A Volt Bd.
3B Volt Bd.
ON* indicates light is dim.
TROUBLESHOOTING AND REPAIR
PC BOARD LED DEFINITIONS
VARIABLE VOLTAGE
LED 3A
LED 3B
Conditions for Light "On" (NA-3 Set for CV)
"Inch Up"
Switch
Pressed
ON
ON ON
ON
ON ON
ON* ON*
ON# is dependent on code number.
NA-3
(continued)
FIGURE F.4 – START/CRATER BOARD
"Inch
Down" "Start" "Stop"
Switch Switch Switch
Pressed Pressed Pressed
ON ON
ON ON
ON ON
ON ON
ON**
ON* ON
ON ON
ON
ON
ON
ON
ON
ON ON
ON ON
ON** only while switch is pressed.
AND NA-4
LED LOCATIONS.
LED 4B
LED 4A
Burnback Weld Arc
Mode Established
ON ON
ON#
ON** ON**
ON ON*
ON
ON
ON
F-20
R
E
T
A
R
C
/
T
R
A
T
S
L
A
N
O
I
T
P
O
ON
ON
ON
ON**
ON
ON
ON
ON
ON
ON
ON