Lincoln Electric PRO-CUT SVM146-A Service Manual page 108

G-10
SCHEMATIC - DISPLAY PC BOARD
Q1
3.32K
J40 2N4401
"READY"
R1
14
SIGNAL
C1
2700p
50V
COM
Q2
3.32K
2N4401
J40
"AIR LOW"
R5
SIGNAL
13
C2
2700p
50V
COM
Q3
3.32K
2N4401
J40
"THERMAL"
R9
SIGNAL
9
C3
2700p
50V
COM
Q4
3.32K
J40 2N4401
"SAFETY"
R13
8
SIGNAL
C4
2700p
50V
COM
+15V
J40
15
C5
4.7
35V
J40
10
COM
1
100 100
1 7
R3 R4
2
2 8
3
4 6 4
LED8
+15V
5
3 5
6
7
LED9
8
8
LED6
100 100
7
R7 R8
1
6
5
2
4
3 4
LED7
2
3
1
1
1 7
100 100
R11 R12
2
2 8
3
4 6 4
LED4
5
+15V
3 5
6
7
LED5
8
8
LED3
7
6 1
R15 R16
5
75.0 75.0
2
4
3
4
LED2
2
3
1
NOTES :
N.A. SINCE COMPONENTS OR CIRCUITRY ON A PRINTED CIRCUIT BOARD MAY CHANGE
WITHOUT AFFECTING THE INTERCHANGEABILITY OF A COMPLETE BOARD, THIS DIAGRAM MAY
NOT SHOW THE EXACT COMPONENTS OR CIRCUITRY OF CONTROLS HAVING A COMMON CODE
NUMBER.
NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual.
ELECTRICAL DIAGRAMS
7
8
6
5
+15V
7 4
8 3
6 2
LED1
5 1
243
R20
+15V
5
J40
DZ1
+15V
10V
1W
2
J40
J40
COM
1
7
J40 AIR SET
+15V
J40
3
11
J40 RESET
J40
4
12
J40
15 14 13 12
J40
FILENAME: M18920_1AA
6
GENERAL INFORMATION
ELECTRICAL SYMBOLS PER E1537
CAPACITORS = MFD ( .022/50V UNLESS OTHERWISE SPECIFIED)
LABELS
RESISTORS = Ohms ( 1/4W UNLESS OTHERWISE SPECIFIED)
DIODES = 1A, 400V (UNLESS OTHERWISE SPECIFIED)
G-10
CONTROL
POT
10K
J40
11 10 9 8 7 6 5 4 3 2 1
LAST NO. USED
R- 20 DZ- 1
LED- 9
C- 5
SUPPLY VOLTAGE NET
POWER SUPPLY SOURCE POINT
COMMON CONNECTION
FRAME CONNECTION
EARTH GROUND CONNECTION
10-31-97D
M M
18920
PRO-CUT 80