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G-7
ELECTRICAL DIAGRAMS
NA-5
VOLTAGE PC BOARD SCHEMATIC
6682-3
Ch'ge. Sht. No.
9-27-85E
11-14-86L
3-6-92B
7-10-92A
3-25-94
11-17-95G
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
EQUIP.
TYPE
SUBJECT
DR
CHK
REF.
SUP'S'D'G
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.
L
WITHOUT THE EXPRESS PERMISSION OF
C501
.022/25
.47/50
.47/50
DZ502
/
L501
R501
27K
15K
2.2K
2.7K
4.7K
100K
2.7K
S7B
COMPONENTS NOT ON P.C. BOARD
KEY TO SYMBOLS
COMMON CONNECTION TO ANALOG POWER
SUPPLY 510
A5H
SCHEMATIC LOCATION REFERENCE
HORIZONTAL CO-ORDINATE LETTER
VERTICAL CO-ORDINATE NUMBER
CODE NUMBER.
CIRCUIT BOARD MAY CHANGE WITHOUT AFFECTING THE
SINCE COMPONENTS OR CIRCUITRY ON A PRINTED
INTERCHANGEABILITY OF A COMPLETE BOARD, THIS
DIAGRAM MAY NOT SHOW THE EXACT COMPONENTS
OR CIRCUITRY OF CONTROLS HAVING A COMMON
A.N.S.I. ELECTRICAL SYMBOLS PER E1537
UNLESS OTHERWISE SPECIFIED, COMPONENT VALUES OF:
CAPACITORS = MFD/VOLTS
RESISTORS = OHMS, 1 2 WATT/
1
2
3
4
5
6
7
B
C
D
E
F
G
H
J
K
L
M
FOR NA-5 CONTROL CODES
8400
8993
NA-5 SCHEMATIC
VOLTAGE CIRCUIT
DAD
NONE
6682-3
10-5-81
7-2-92
THE LINCOLN ELECTRIC CO.
CLEVELAND, OHIO U.S.A.
EQUIP.
TYPE
SCALE
SUBJECT
DR
DATE
CHK
REF.
SUP'S'D'G
SHT.
NO.
L
C
39/20
4.7/35
L502
500 TRIMMER
1K
100K
15K
330K
22K
3.3K
R526
VOLTAGE P.C. BOARD
47K
47K
22K
100K
27K
10K
100
10K
56K
27K
DM601
DIGITAL METER
SPDT, VOLTS SET-ACTUAL
NOTES:
C601
500/50
4.7/35
.022/25
1A, 400V
R601
R602
R603
X601
2.80K, 1/4W, 1%
A
A5H
635
SETTING
C506
D
-
+
6
5
X501
CONTROL
AMP
7
A
-
+
2
3
X502
X502
R514
R540
637
D5A
500
A6H
Q503
C528
R531
687
D4B
R602
R601
CAL
CW
4
R603
TP4
C603
E
C
DM601
1
2
C602
+
OUT
IN
X601
GND
+
C601
601
602
A6E
A6E
D602
D604
D603
D601
510
B7G
TP5
+5V
510P
B3C
VOLTMETER
VOLTMETER
POWER SUPPLY
ACTUAL
SET
S7B
VOLTS
SET-ACTUAL
9147
N.B.
C504
C505
C506
C507
C508
C509
C510
C511
C512
C513
C514
C516
C517
C518
C519
C520
C521
C522
C523
C524
C525
C526
C527
C528
.1/100
4.0/50
.022/25
.022/25
.022/25
1.8/20
27/35
4.7/35
.022/25
39/20
.0047-.005/1400
.022/25
.022/25
.022/25
.022/25
.022/25
.01/200
4.7/35
.47/50
.022/25
D501
THRU
D522
1A, 400V
DZ503
DZ504
DZ505
DZ506
DZ507
6.8V, 1 2W
5.1V, 1/2W
20V, 1W
15V, 1W
6.2V, 1/2W
6.8V, 1/2W
33uH, 110mA
33uH, 110mA
OCI501
OCI502
OPTO-ISOLATOR
Q501
Q503
Q505
Q506
Q507
Q508
X501
X502
2N4123
2N5816
2N4123
2N4857
2N5816
2N5816
QUAD OP-AMP
QUAD OP-AMP
R502
R503
R504
R505
R506
R507
R508
R509
R510
R511
R512
R513
R514
R515
R516
R517
R518
R519
R520
R521
R522
R523
R524
R525
44.2K, 1/4W, 1%
4.75K, 1/4W, 1%
100K
10K
1K
2K TRIMMER
5.6K
100K
39K
56K
27K
R527
R528
R529
R530
R531
R532
R533
R534
R535
R536
R537
R538
R539
R540
R541
R542
R543
R544
R545
R546
R547
R548
R549
22K
27K
1K
33K
5K TRIMMER
1K, 12W
470
68K
15K
15K
270
270
100
270
F501
1 8 AMP FAST
/
BLOW FUSE
SWITCH
SBS501
T501
24 VAC, 185 mf
SECONDARY
TP501
150V, 10J
VOLTMETER P.C. BOARD
C602
C603
C604
D601
.022/25
D602
D603
D604
24.3K, 1/4W, 1%
2K TRIMMER
+5V VOLTAGE REGULATOR
INPUT CONTROL CABLE CONNECTION
N.A. THESE CAPACITORS ARE LOCATED
ON THE R.F. BYPASS BOARD.
(SEE SCHEMATIC A).
N.B. SEE L6682-3A SCHEMATIC FOR
BOARD.
SUPERSEDED G1556-1 VOLAGE
N.C. EARLIER VOLTAGE BOARDS DO
NOT HAVE THIS RECEPTACLE, AND
LEAD 688A WAS 688.
C1102
C1101
N.A.
+
-
ARC
VOLTAGE
POLARITY
TERMINALS
F501
L502
L501
667
621
C519
510P
B3C
R503 R502 R501
C501
D502
CW
A
+
-
13
12
11
4
14
C521
500
A6H
C520
525
A5H
C524
+
500
A6H
B
+
-
9
10
8
R504
C504
510P
B3C
X501
R547
C523
ACTUAL VOLTAGE
METER FILTER
C
-
+
R546
517
C604
A
518
3
2
X501
1
514
C510
+
510P
B3C
SET VOLTAGE
BUFFER
VOLTAGE
PROCEDURE
P.C. BOARD
E2E
516
R537
525
ACTUAL VOLTAGE
BUFFER
D501
D503
DZ
503
+
C505
R505
D504
R539
R532
D516
R506
D505
R535
R507
1
+
+
C518
C508
R509
R510
C507
D506
PIN S
PIN F
WELD
RESPONSE
JUMPER
(RED)
R518
Q506
525
A5H
R516
R517
C517 +
500
A6H
D508
R508
HOLD - LOW CIRCUIT
4231
688
525
A5H
D4J
688A
ARC CONTROL
ENABLE
N.C.
VOLTAGE P.C. BOARD RECEPTACLE FOR
BOARD (SHOWN WITH JUMPER PLUG
OPTIONAL PULSED POWER FILTER P. C.
INSTALLED.)
10
9
+
B
-
8
D517
Q501
R515
START
CW
R512
GAIN
CW
R538
R511
R519
+
+
C512
D514
PIN
PIN
PIN
A
B
D
D510
D511
R521
R523
R520
R522
R524
525
A5H
C511
R525
D507
C
+
-
4
5
6
11
D509
688
D4J
500
A6H
C522
X502
7
SHUTDOWN
ENABLE
SHUTDOW CIRCUIT
525
A5H
R533
R534
A
B
R513
1 OCI501
2
6
4
5
DZ
504
C509
C
POWER SOURCE
CONTROL INTERFACE
C513
+
R549
SHUTDOWN
D518
SBS
501
R530
BYPASS
AUTO
COM
500
D9C
Q508
Q507
R529
R536
R528
DZ
507
D515
D
+
-
X502
R526
525
A5H
R527
+
C526
R545
510P
B3C
R544
AUTO-STOP
CIRCUIT
AUTO-STOP AND
SHUTDOWN BYPASS
TAB JUMPER (BLUE)
START
RESPONSE
JUMPER
(WHITE)
R541
DZ
506
D520
D519
T501
115
VAC
531B
532
A5D
A5D
24
VAC
D521
D522
R548
510P
B3C
R543
R542
C525
510
D513
592
D7A
0CI502
C527
5
4
6
2
1
TP
501
C516
D512
SCHEMATIC IDENTIFICATION LETTER
DZ502
D514
12
13
14
S7B
FROM
OPTION
AND
FOR VOLTMETER P.C. BOARDS
L6685-1 OR HIGHER USE S21143
SCHEMATIC FOR COMPONENT
VALUES AND CIRCUIT CONNECTIONS.
SILICON BILATERAL
G-7
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 avail-
able 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.
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