Control Board Schematic (G2150 - Lincoln Electric SQUARE WAVE TIG 255 SVM100-A Service Manual

ELECTRICAL DIAGRAMS
CONTROL BOARD SCHEMATIC — SQUARE WAVE TIG 255
(G2150)
R 6 7
1 0 0 K
E L E C T R O D E
J 6
1 3
5
R 5 5
D 2 2 D 2 1 1 4
1 . 0 0 M X 1 1 R 3 9
C 4 9 1 2
1 0 0 K
. 0 0 4 7
3 0 0 0 V C 7 9
V o l t a g e F B 7 5 0 p
1 0 0 0 V
D 1 1 D 1 0
N G N D
N G N D
W O R K
1 2 R 3 8
J 6
C 8 0 1 . 0 0 M
7 5 0 p
1 0 0 0 V
D Z 1 6
D Z 1 4
1 2 V
1 2 V
N G N D
1 W
1 W
D Z 1 7
D Z 1 5
1 2 V
1 2 V
1 W
1 W
N G N D N G N D
R 2 1 4 R 1 9 9
1 . 0 0 K C 6 5 D 9 9 1 0 0 K
4 . 7
D 1 0 0
3 5 V
C 6 6
4 . 7 D 1 0 1
3 5 V
D 2 5
S 1 8 6 4 7 - 2
D 5 D 4
X 1 5
I N
7 8 1 5
J 8
1
G N D
C 6 7
C 4 2
. 0 0 4 7 3 5 V
3 0 0 0 V 1 0 0 0
J 8
3 6 V A C C T C T
7
C 4 3
C 6 8
( 1 o f 5 X F M R
2 0
s e c o n d a r y . 0 0 4 7
5 0 V G N D
w i n d i n g s )
3 0 0 0 V
J 8
2
X 1 6
I N
D 3 D 2 7 9 1 5
D 9 2 D 2 4
V B
1 6 V A C
1 1
X 1 0
1 6 V A C
6
5
X 1 0
X 3 1
1 6 V A C
1 0 K
1 2 0 V A C
1 3
X 1 0
7 1 0 K
2 4 V A C
X 3 1
1 0 K
7
3 6 V A C C . T .
X 3 2
L G N D L G N D L G N D
C O N T R O L T R A N S F O R M E R
NOTE: Lincoln Electric assumes no responsibility for liabilities resulting from board level troubleshooting. PC Board
repairs will invalidate your factory warranty. This Printed Circuit Board schematic is provided for reference only. It may not
be totally applicable to your machine's specific PC board version. This diagram is intended to provide general information
regarding PC board function. 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.
T O A 4 8 2 . 2
R 1 3 6 R 1 3 7
4 7 5 K 1 5 . 0 K
D 3 0
- 1 5 V
N G N D
R 4 0
4 7 . 5 K
2 V O L T _ F B
1
X 1 1 R 6 9
3 5
1 . 0 0 K
C 8 1
0 . 1 X 3 1
4 7 . 5 K 5 0 V
I O G N D
N G N D
I O + 5 V
4 . 7 5 K
Q 1 9 8 Z E R O C R O S S
X 1 0
6 0 0 m A
4 0 V
C 4 1
N + 5 V L + 5 V I O + 5 V L C D + 5 V X 3 1 _ + 5 V X 3 2 _ + 5 V
4 7 5 K
I O G N D
+ 1 5 V
D 2 3
I N O U T
X 1 2
O U T 7 8 0 5
G N D D 7 2 C 4 4
1 . 0
C 4 7
1 . 0 D 7 1 3 5 V
3 5 V
C 4 8
1 . 0
3 5 V D 7 3
O U T
C 4 5
.1
5 0 V
N G N D L G N D
- 1 5 V
L C D G N D X 3 1 G N D
R 6 3
I O G N D X 3 2 G N D
2 2 1 K
L + 5 V
1 0
6
V d d 2 6 2 0 1 4 2 0
2 0
1 2
X 3 C 3 X 1 0
C 1 0 C 7
X 2 0 X 2 1 C 6 9
0 . 1 X 2 2
0 . 1 0 . 1
7 4 H C 1 4 0 . 1
5 0 V
5 0 V 5 0 V
M C 6 8 H C 1 1 5 0 V
7 4 H C 5 7 3 7 4 H C 5 7 3
7 4 H C 5 7 3
V s s
1 1 0 7 1 0
1 0
L G N D
L E G E N D
( G R O U N D A N D + 5 V N E T S )
I O G N D P R O C E S S O R I O C O M M O N
L G N D L O G I C C O M M O N
N G N D N O I S Y C O M M O N
L C D G N D D I S P L A Y C O M M O N
X 3 1 G N D X 3 1 C O M M O N
+ 1 5 V
X 3 2 G N D X 3 2 C O M M O N
1 5
I O + 5 V P R O C E S S O R I O + 5 V S U P P L Y
L + 5 V L O G I C + 5 V S U P P L Y O C I 4
2 6 4
C N Y 1 7 - 3
N + 5 V N O I S Y + 5 V S U P P L Y
L C D + 5 V D I S P L A Y + 5 V S U P P L Y
X 3 1 _ + 5 V X 3 1 + 5 V S U P P L Y
1 . 0 0 K D Z 4
X 3 2 _ + 5 V X 3 2 + 5 V S U P P L Y
1 8 V
1 W
I O + 5 V
C 3 8
.1 1 . 0 0 K
+ 1 5 V
5 0 V
Q 5
3 4
X 1 0 R 1 8 4 6 0 0 m A
1 0 0
1 5
4 0 V
2 6 7
Q 1 7
R 2 7 R 2 2 6 0 0 m A
4 0 V
2 2 1 K 1 0 K
O C I 3
2 6 4
I O G N D
C N Y 1 7 - 3
2 . 2 1 K
I O G N D
I O G N D
D Z 5
1 8 V
1 W
I O + 5 V
1 . 0 0 K
Q 3
1 2
X 1 0 R 1 8 5 6 0 0 m A
4 0 V
2 6 7
Q 1 6
R 9 6 0 0 m A
4 0 V
1 0 K
I O G N D
I O G N D
+ 1 5 V
I O G N D
X 3 1 _ + 5 V X 3 2 _ + 5 V
4 C 1 1 4 C 1 4 8
0 . 1 0 . 1
C 7 0 5 0 V 5 0 V
0 . 1 X 1 1 X 1 4
X 3 1
5 0 V
C 1 2 C 1 5
T C F 6 0 0 0 T C F 6 0 0 0
3 3 0 7 4 A 3 3 0 7 4 A
0 . 1 0 . 1
5 0 V 5 0 V
1 1 1 1 1
I O G N D
I O G N D
X 3 1 G N D
- 1 5 V
J 8
A U X S C R 1 , 2
6
D 5 4
D 5 1
16VAC + 1 5 V
D 7 7
( 1 o f 5 X F M R
1 0 0 1 0 0 1 0 0 s e c o n d a r y
1
D 5 3 w i n d i n g s )
C 2 9 D 4 9
2 7
J 8
3 5 V A U X S C R 1 , 2
1 2
2 6
D Z 7
3 0 V
Q 4
1 A 1 W
1 0 0 V
J 5
1 S C R 1 G A T E
1 . 0 0 K
D 5 2
D 5 0
J 5
6
S C R 1 C A T H O D E
J 8
5
A U X S C R 3
D 4 8
D 4 7
16VAC
+ 1 5 V
( 1 o f 5 X F M R
1 0 0 1 0 0 s e c o n d a r y
D 4 6 w i n d i n g s ) 1
C 2 7 D 4 5
2 7
J 8 A U X S C R 3
3 5 V
1 1
2 6
D Z 6
3 0 V
Q 6
1 W
1 A
1 0 0 V
J 5
3
S C R 3 G A T E
D 4 4
D 4 3 1 . 0 0 K
J 5
S C R 3 C A T H O D E
8
G E N E R A L I N F O R M A T I O N
C A P A C I T O R S = M F D ( . 0 2 2 / 5 0 V
R E S I S T O R S = O h m s ( 1 / 4 W
D I O D E S = 1 A , 4 0 0 V ( U N L E S S O T H E R W I S E S P E C I F I E D )
8
S Q U A R E W A V E T I G 2 5 5 C O N T R O L B O A R D
X 3 2
A 4 8 2 . 1
1
X 3 2 G N D
G-11
D 7 6
1 0 0 1 0 0 1 0 0
5 C 2 8
2 7
3 5 V
O C I 5
4
C N Y 1 7 - 3
D Z 1 0
Q 2
3 0 V
1 A
1 W
1 0 0 V
J 5
1 . 0 0 K D Z 8 2 S C R 2 G A T E
1 8 V
D 5 9
1 W
D 5 8
1 . 0 0 K
J 5
S C R 2 C A T H O D E
7
J 8
4 A U X S C R 4
D 5 5
D 1
16VAC
( 1 o f 5 X F M R
s e c o n d a r y
1 0 0 1 0 0 1 0 0
5 w i n d i n g s )
D 6 D 5 6
C 3 0
2 7
J 8
3 5 V
A U X S C R 4
1 0
O C I 6
4
C N Y 1 7 - 3
D Z 1
Q 1 2
3 0 V
1 A
1 W
1 0 0 V
J 5
1 . 0 0 K S C R 4 G A T E
4
D Z 9
D 7
1 8 V
1 W D 5 7
1 . 0 0 K
J 5
9 S C R 4 C A T H O D E
U N L E S S O T H E R W I S E S P E C I F I E D )
U N L E S S O T H E R W I S E S P E C I F I E D )
0 1 / 0 3 / 9 4
A
SQUARE WAVE TIG 255