Diagrams, Wiring diagram ln-742, Control p.c. board – Lincoln Electric IM502 LN-742H Wire Feeder User Manual
Page 41: Display p.c. board, Keypad
F-1
DIAGRAMS
F-1
LN-742 & LN-742H
CLEVELAND, OHIO U.S.A.
3-29-96H
L9124
R
WIRING DIAGRAM LN-742
J1
P.M.
R
U
B
+
-
AC
AC
542
500M
542
500M
2
J3
J4
J5
J6
J7
BRIDGE
INPUT CABLE
RECEPTACLE
CONTROL P.C. BOARD
2
4
21
A
B
C
D
E
*
*
*
*
*
*
1
1
4
5
8
1
3
4
6
12
3
4
1
2
J3
J4
J2
J6
J1
J5
J7
1
2
CAVITY NUMBERING SEQUENCE
*
CONNECTOR CAVITY
NUMBERING SEQUENCE
LEAD COLOR CODING
B - BLACK
R - RED
W - WHITE
U - BLUE
B
W
INPUT ELECTRODE CABLE
(NON LEAD SIDE OF CONNECTOR)
J2
*
21
67
75
76
77
F
G
H
75
76
77
6
7
12
4
4
4
500
500
DISPLAY
P.C. BOARD
1
2
A
B
C
D
E
F
G
E
500
KEYPAD
*
*
J10
500
A
B
C
D
E
F
G
N.A.
1
8
552
554
553
67
554
551
552
553
(COMPONENT SIDE OF P.C. BOARD)
J10
1
2
3
4
5
6
1
2
*
*
*
517
516
W
W
CD
A
B
G
F
551
R
U
B
W
W
1
3
4
6
*
**
516
G
U
N
R
W
B
CW
CW
A
B
C
D
E
F
517
75
76
77
G
U
N
B
W
R
G - GREEN
N - BROWN
10K
5K
518
516
L
L
L
P9
518
J11
P8
PIN NUMBERING SEQUENCE
P9
PIN 1
J9
J8
L
R.F. CHOKE
517
518
B
W
R.F. TOROID ASSEMBLY
J11
512A
W.F.S.
VOLTAGE
512A
TACH
B
U
R
ELECTRICAL SYMBOLS PER E1537.
N.A. PRESENT ONLY ON THE LN-742H MODELS.
P8
R
R
R.F. TOROID ASSEMBLY
R
R
41
42
A
B
C
D
E
GUN
CONTROL
CABLE
W.F.S. POT. CONNECTOR AND
VOLTAGE POT. CONNECTOR
OPTIONAL REMOTE
WIRE FEED SPEED &
VOLTAGE POT. ASSEMBLY
CURRENT
SENSING
REED SWITCH
GAS
SOLENOID
OPTIONAL
WATER
SOLENOID
P10
P11
345678
1
2345678
1
23456789
10
11
12
1
234
1
2345678
1
23456
1
2
1
2
1
234
U
U
(COMPONENT SIDE OF P.C. BOARD)
**
***
J14
J13
J12
L
L
L
L
L
L
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The specific diag
ram for a particular code is pasted inside
the machine on one of the enclosure panels. If the diagram is illegible, write to the Service Department for a replacement. G
ive the equipment code number..