Filter
Top Products
G-10
ELECTRICAL DIAGRAMS
LN-9 GMA
Operating Schematic
1763
12-21-89C
11-9-90D
11-1-91A
1-21-94H
3-25-94A
6-7-96A
8-2-96B
LN-9 GMA AND LN-9F GMA
OPERATING SCHEMATIC
DAD
NONE
1763
6-26-86
6-25-92
t
UNLESS OTHERWISE SPECIFIED TOLERANCE
ON HOLE SIZES PER E2056
ON 2 PLACE DECIMALS IS .02
WITH PUBLISHED STANDARDS.
ON 3 PLACE DECIMALS IS .002
ON ALL ANGLES IS .5 OF A DEGREE
MATERIAL TOLERANCE (" ") TO AGREE
THE LINCOLN ELECTRIC CO.
CLEVELAND, OHIO U.S.A.
EQUIP.
TYPE
SCALE
DR DATE CHK
REF.
SUBJECT
SUPÕSÕDÕG
SHT.
NO.
THE LINCOLN ELECTRIC CO.
THIS SHEET CONTAINS PROPRIETARY INFORMATION
OWNED BY AND IS
NOT TO BE REPRODUCED, DISCLOSED OR USED
THE LINCOLN ELECTRIC CO.
G
G
WITHOUT THE EXPRESS PERMISSION OF
C101
TP
101
32A
7A
7
32A
32 3A CIRCUIT BREAKER
GAS
SOLENOID
C104
D101
C102
PT
101
C103
PT
101
D102
C105
SCR101
SCR102
CR101
F101
CR101
D103
REV.
FWD
541
(B)
539
(W)
P.M.
ARM
532
CR101
531
R1
31
531
31
115 VAC
T1
115 VAC
32A
T2
24 VAC
26 VAC
526
527
S7
DIRCTION
SWITCH
4
9
3
11
7
7
7A
31
524A
524
2A
6
5
10
12
628
500
504
CR101
HOT
COLD
HOT
2
4
S2A
HOT-COLD
INTERLOCK SWITCH
620
621
530
500
622
623
TRIGGER
BOARD
530
500
622
623
TRIGGER
SWITCH
620
621
TO CONTROL
RHEOSTAT PLUG
D
TRIGGER CIRCUIT
B
B
B
B
B
A
INPUT AND MOTOR POWER CIRCUIT
D104
D105
526
C106
527
D108
R101
D109
C108
525
+15V
Q101
628
C107
DZ101
+
D106
D107
601
602
9.6 VAC
DZ102
500
-10V
ZERO
VOLT
510
REFERENCE
R108
Q104
R109
C
D
S
3
6
5
Q
Q
R
1
2
4
C113
R110
R113
522
7
8
9
10
11
X101
14
C116
500
530B
ON
OFF
C114
TRIGGER
INTERLOCK
S2b
HOT COLD
D120
D119
C115
500
530
D
D
R111
Q105
D117
D116
530
C117
530A
CR501
524
CR101
D110
D111
R102
524A
A
529
CR2
628
D112
R104
R103
D113
C109
Q103
R105
R107
R106
C111
+
C110
D114
521
Q102
C214
+
525
B
11 10
12
6
R201
5
Q207
2
R203
3
R203 R204
REF
13
C202
4
CW
R205
7
X201
C203
+
520
+10.00 V.
B
CONTROL POWER SUPPLY AND RELAY CIRCUIT
R206
R209
B
525
R207
C216
1
11
X202
12
2
3
4
+
R246
R208
C206
C205
CW
CAL
9
8
10
5
C221
R211
R210
R242 R2
CW
631
633
WIRE SPEED
CONTROL
632
+
C215
12
13
-
+
B
14
X203
B
3
2
-
+
A
1
X203
4
11
R202
R244
C218
500
-
C212
C213
R218
511
512
R217
C217
525
B
5
6
-
+
D
7
X203
R221
R238
C208
C209
J
R222
K
CW
H1
3
2
-
+
A
1
X204
C219
525
B
4
C220
500
B
+
C210
R226
R239
R230
R231
D208
C223
Q203
D205
R227
R228
C211
M
QU201
C228
C112
540
R232
R234
500
B
PT
101
L
C225
R237
C227
Q206
DZ202
Q205
DZ203
R229
Q204
C224
CW
LO
D206
R233
R235
R236
628
B
R212
10
9
-
+
C
8
X203
R214
R220 R219
R241
R240
512
511
C
C
510A
10
9
-
+
B
8
X204
PIN
PIN
F S
CW
ACC
R216
C207
+
R215
D202
Q201
C226
R213
525
B
D204
C229
+
DZ201
R224
R225
Q202
C222
D203
D201
524A
A
C
MOTOR CONTROL CIRCUIT
B
525
555
R245
(Y)
X1
(R)
(B)
HALL EFFECT
MODULE
RING
MAGNET
A
B
R533
R534
C
C509
DZ
501
R513
1 5
525
2
6
4
B
OCI
501
R512
R538
Q501
R540
GAIN
CW
D517
R541
START
CW
R542
D
12
13
+
-
X502
14
R511
C507
R509
+
+
C508
C518
R510
PIN F
PIN S
A
1
X502
3
2
+
-
R507
WHITE
PIN A
PIN B
BLUE
C512
+
D506
R535
S
D
R519
G
Q502
R517
525
B
R516
D508
521A
E
500
B
C517
D505
C506
D
-
+
X501
1
2
3
R506
D504
R505
C505
DZ503
+
R532
D516
R539
667
E
R508
R518
C
X501
8
10
9
+
-
+
C510
C516
514
R515
R3
636
510B
"VOLTS"
CONTROL
R514
520
B
634
CW
635
D503
525
B
R537
2341
521A
500521525
B
D509
D501
VOLTAGE P.C. BOARD RECEPTACLE
FOR OPTIONAL PULSED POWER
(SHOWN WITH JUMPER PLUG
INSTALLED)
FILTER P.C. BOARD PLUG
515
C519
R536
7
X501
B
-
+
6
5
510B
C504
R504
14
12
13
-
+
A
4
11
C521
500
510B
C503
500
B
525
B
+
C520
B
510B
X501
D502
C501
R502
CW
CAL
R503
510B
C502
F501
POS
721
R501
TP
501
67
21
GMA TIMER AND BURNBACK TIMER
RECEPTACLE (SHOWN WITH JUMPER
PLUG INSTALLED)
S3
POLARITY
SWITCH
NEG
E
VOLTAGE CONTROL CIRCUIT
POWER CIRCUIT
C101
C102
C103
C104
C105
C106
C107
C108
C109
C110
C111
C112
C113
C114
C115
C116
C117
D101
D102
D103
D104
THRU
D108
D109
D110
D111
D112
D113
1A
1A
1A
.005/1400
.047/100
.047/100
.005/1400
.005/1400
.15/200
150/50
.022/25
.022/25
.022/25
2.7/50
.01/100
.022/25
.022/25
.022/25
.022/25
.15/200
*
16A
16A
16A
1A
.15A
.15A
D114
1A
D116
D117
D119
D120
1A
1A
.15A
.15A
F101
4/10 SLOW BLOW FUSE
R101
330 OHM
R102
R103
R104
R105
R106
R107
R108
R109
R110
R111
R112
R113
10 OHM
2.2K OHM
15K OHM
1K OHM
10K OHM
100K OHM
22K OHM
47K OHM
22K OHM
15K OHM
15K OHM
100 OHM
CR101
3PDT 24 VDC
SCR101
SCR102
12A, 400V
12A, 400V
Q101
Q102
Q103
Q104
Q105
2N5655
2N5655
MPS A92
2N4125
BS170
*
C112 AND PT101 PRIMARY ARE SHOWN IN SECTION
C
PT101
TP101
DZ101
DZ102
X101
1:1:1 PULSE TRANS.
TRANSIENT PROTECTOR
I.C. DUAL "D" FLIP FLOP
15V, 5W
10V, 5W
*
C201
C202
C203
C204
C205
C206
C207
C208
C209
C210
C211
C212
C213
C214
C215
C216
C217
THRU
C228
.022/25
.022/25
4.7/35
.0033/200
.33/50
18/15
4/50
.04/100
2.7/50
.15/200
.022/25
.022/25
4.7/35
18/15
100pf/100
.022/25
C229
D201
THRU
D206
D208
R201
.47/50
1A.
1A.
1K OHM
R202
R203
R204
R205
R206
R207
270 OHM
500 OHM TRIMMER
1.00K OHM 1/4W 1%
2.94K OHM 1/4W 1%
15K OHM
10K OHM
R208
R209
R210
R211
R212
R213
R214
R215
R216
R217
R218
R219
R220
R221
R222
R223
R224
R225
R226
R227
R228
R229
R230
R231
R232
R233
R234
R235
R236
R237
R238
100K OHM TRIMMER
33K OHM
10K OHM
5.6K OHM
15K OHM
47K OHM
15K OHM
100K OHM
1K OHM
1K OHM
1K OHM
33K OHM
50K OHM TRIMMER
15K OHM
10K OHM TRIMMER
33K OHM
100K OHM
1K OHM
13.7K OHM
6.8K OHM
10K OHM
10K OHM TRIMMER
22K OHM
15 OHM
100 OHM
6.8K OHM
2.7K OHM
10K OHM
15K OHM
10K OHM
1M OHM
D510
D511
R520
R522
R521
R523
5
6
B
+
-
4
11
7
X502
C511
525
B
C522
500
B
R530
C513
D512
BYPASS TABS
SHUTDOWN
R531
530A
CR501
Q503
D513
DZ502
R524
525
B
CR
501
D514
CONTROL CIRCUIT
C401
500 MFD
4.7 MFD
C402
C403
C404
THRU
THRU
D404
X401
R401
DM401
.022 MFD
27 MFD
C407
D401
1A
VOLTAGE REGULATOR
DIGITAL METER
24.3K OHM 1/4W 1%
R402
R403
R404
R405
R406
R407
R408
R409
2.80K OHM 1/4W 1%
13.7K OHM 1/4W 1%
3.74K OHM 1/4W 1%
61.9K OHM 1/4W 1%
2K OHM TRIMMER
2K OHM TRIMMER
500 OHM TRIMMER
5K OHM TRIMMER
METER CIRCUIT
C501
C502
C503
C504
C505
C506
C507
C508
C509
C510
C511
C512
C513
C514
C515
C516
C517
C518
C519
THRU
C522
.1/100
4.7/35
.005/1400
4.0/50
.47/50
.022/25
.022/25
39/20
.022/25
1.8/20
.022/25
4.7/35
27/35
.022/50
1/35
.022/25
.47/50
39/20
.022/25
D501
THRU
D518
CR501
DZ501
DZ502
DZ503
F501
20V, 1W
S.P.D.T. 24VDC
1 AMP
15V, 1W
5.1V
1 8 AMP FAST
OPTO-ISOLATOR
/
BLOW FUSE
OCI501
Q501
2N4123
Q502
Q503
X501
2N4857
MPSA42
X502
I.C. QUAD OP-AMP
I.C. QUAD OP-AMP
TP501
TRANSIENT
PROTECTOR
R501
R502
R503
R504
R505
R506
R507
R508
R509
R510
R511
R512
R513
R514
R515
R516
R517
R518
R519
R520
R521
R522
R523
R524
44.2K OHM 1/4W 1%
500 OHM TRIMMER
4.75K OHM 1/4W 1%
100K OHM
27K OHM
15K OHM
10K OHM
2.2K OHM
2.7MEG OHM
4.7K OHM
100K OHM
1K OHM
2.7MEG OHM
5.6K OHM
1.8K OHM
100K OHM
1K OHM
270 OHM
100K OHM
15K OHM
56K OHM
330K OHM
22K OHM
4.7K OHM
R525
4.7K OHM
R526
R527
R528
22K OHM
22K OHM
22K OHM
2.2K OHM
27K OHM
100K OHM
27K OHM
10K OHM
R529
R530
R531
R532
R533
R534
R535
R536
R537
R538
R539
R540
R541
R542
100 OHM
1K OHM
270 OHM
33K OHM
56K OHM
27K OHM
5K OHM TRIMMER
2K OHM TRIMMER
5.6K OHM
D509 NOT USED FOR
GMA MODELS
CR501 N.C. CONTACT ARE
SHOWN IN SECTION
B
VOLTAGE CIRCUIT
R1
2 OHM 50W
COMPONENTS
R2
R3
R4
10K OHM 2W POT.
10K OHM 2W POT.
22K OHM
CR2
WELD CURRENT-
REED SWITCH
CR4
G.L.P. REED SWITCH
S1
S2
S3
S4
S5
S6
S7
SPST TRIGGER SWITCH
DPDT POLARITY SWITCH
DPDT
CENT. OFF
HOT-COLD
INTERLOCK SWITCH
SPST G.L.P. RESET SWITCH
DPDT SET-ACTUAL SWITCH
3 POLE VOLTS-SPEED SELECTOR SWITCH
DPDT DIRECTION SWITCH
T1
T2
X1
POWER SUPPLY TRANSFORMER
TRIGGER SUPPLY TRANSFORMER
HALL EFFECT MODULE
COMPONENTS NOT ON P.C. BOARD
CIRCUIT
A
C
E
F
B
F
D
E
F
G
G
A
B
D
B
B & D
KEY TO SYMBOLS
INPUT CABLE CONNECTION
POWER OR SIGNAL SOURCE POINT
REMOVABLE CONNECTION
COMMON CONNECTION
A
THRU
G
SOURCE POINT CIRCUIT LOCATION
J
THRU
M
TEST POINTS
SINCE COMPONENTS OR CIRCUITRY ON A PRINTED CIRCUIT
BOARD MAY CHANGE WITHOUT AFFECTING THE INTERCHANGEABILITY
COMPONENTS OR CIRCUITRY OF CONTROLS HAVING A COMMON
CODE NUMBER.
OF A COMPLETE BOARD, THIS DIAGRAM MAY NOT SHOW THE EXACT
NOTES
CAPACITORS = MFD/VOLTS
RESISTORS = OHMS/WATTS
*
*
1 2 WATT UNLESS OTHERWISE/
SPECIFIED.
OP - AMP = LM 224
REGULATOR = LM 723
F/V CONVERTER = LM 2907
DUAL "D" FLIP FLOP = MC14013B
LEAD COLOR CODING
B - BLACK
R - RED
U - BLUE
W - WHITE
B
C
-
+
X502
10
9
R525
R526
+
C515
R528
C514
R527
R529
R4
533
CR4
S4
G.L.P. RESET
500
B
GND
F
SHUTDOWN CIRCUIT
534
R409
R408
C407
R407
R406
C406
CW
561
R405
R404
C405
R402
R401
C404
CW
CW CW
510A
510B
602
B
601
B
D402
D401
D403
D404
+
C401
IN
GND
X401
OUT
1
2
C
C402
+
E
510
510C
DM401
A
3
4
TP5
+5V
+
C403
R403
TP4
9
10
11
12
C3
S6
513
S5
511
C
SET
C2
514
E
512
C
515
E
5
6
7
VOLTS
8
IN./MIN.
510
ACTUAL
LO
518
562
518
HI
M/MIN
C1
1
2
3
4
516
517
G
METER CIRCUIT
2
667
539B
541B
+
D507
R112
INTERLOCK
SWITCH
C204
C201
+
+
D515
D518
B
519
560
ELECTRICAL SYMBOLS PER E1537
32A
18/15
FOR VOLTMETER P.C. BOARDS
L6688-1 OR HIGHER USE S21146
SCHEMATIC FOR COMPONENT
VALUES AND CIRCUIT CONNECTIONS.
522
C
R239
R240
R241
R242
R243
R244
R245
R246
X201
15K OHM
5.6K OHM
15K OHM
560 OHM
10 OHM
270 OHM
10K OHM
68.1K OHM
I.C. REGULATOR
X202
X203
I.C. QUAD OP-AMP
I.C. F/V CONVERTER
X204
I.C. QUAD OP-AMP
Q201
Q202
Q203
Q204
Q205
Q206
Q207
2N4123
2N4125
BS170
2N4123
2N5816
2N6027
6.8V.
QU201
DZ201
DZ202
DZ203
16.0V.
3.0V.
FOR P.M. CONTROL BOARDS
L10068-1 OR HIGHER USE
SCHEMATIC L10069.
FOR POWER BOARDS
L7265-3 OR HIGHER USE
SCHEMATIC L8871.
FOR VOLTAGE P.C. BOARDS
L6084-4 OR HIGHER USE L8388
SCHEMATIC FOR COMPONENT
VALUES AND CIRCUIT
CONNECTIONS.
G-10
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NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not
available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result
in danger to the Machine Operator or Technician. Improper PC board repairs could result in damage to the machine.