Lincoln Electric SVM100-A Appliance Trim Kit User Manual


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G-12
ELECTRICAL DIAGRAMS
SQUARE WAVE TIG 255
CONTROL BOARD SCHEMATIC — SQUARE WAVE TIG 255 (cont’d)
(G2150)
N+5V
LGND
ROW 5
130
8.0MHz
Y1
1.00M
R71
1K
R87
100V
22p
C22
4.75K
R81
4.75K
R210
1.0
35V
C23
C20
GND
RES
IN
X19
50V
0.1
C33
C5
J6
10
+15V
475
R83
D39 D34
IOGND
18
15V
C16
D7
L+5V
J6
11
J6
3
D0-D7
D4
D6
C25
D5
D0
1K
R84
D3
X32
4
1.00K
R140
D1
D2
100V
22p
C32
4.75K
R48
LGND
X32
6
50V
150p
C19
CNY17-3
OCI2
42
1
6
5
X32
3
475K
R70
ROW 4
4.75K
R79
4.75K
R132
X32
2
CRYSTAL
NOT USED
PE4
RESET
LED LATCH ENABLE
DISPLAY LATCH ENABLE
MISC. LATCH ENABLE
LATCH OUTPUT ENABLE
REF
A/D
PC1
NOT USED
XIRQ
ROW 3
X32
5
D80
+15V
IO+5V
N+5V
COL 3
COL 4
KEYPAD
COL 2
COL 1
AC/DC MICROSWITCH
ROW 1
ARC START SWITCH
ROW 2
ROW 1
ROW 5
ROW 3
ROW 2
ROW 4
OC4
MODA
NOT USED
NOT USED
NOT USED
NOT USED
PE6
J2
5
100V
100p
C84
100V
100p
C86
10K
R187
475K
R43
10K
R76
50V
150p
C21
CNY17-3
OCI1
42
1
6
5
1.00K
R129
100V
100p
C85
26.7K
R233
J8
9
J6
4
J8
3
1.50K
R72
1.50K
R85
475
R82
D40
D19
475
R73
C34
D37
D38
D79
D20
18
15V
C35
D18
1K
R74
475
R75
J2
6
J2
4
J2
2
40V
600mA
Q11
J2
8
100V
100p
C82
100V
100p
C83
D78
D81
1.00K
R77
+
t
56
PTC2
J2
9
J2
1
26.7K
R231
26.7K
R232
J2
7
1.00K
R124
1.00K
R57
26.7K
R230
1.00K
R127
1.00K
R123
J2
3
26.7K
R234
4.75K
R215
1
26
MODB
IC1
Vss
PC5
Vdd
X3
PE2
EXTAL
PC7
PC6
PD3
PA7
PA0
PA1
VRH
PC0
IRQ
PD4
PD1
PE0
VRL
PD0
XTAL
PE3
PE5
OC2
PD5
OC3
MC68HC11
PD2
PE7
OC5
PC2
RESET
PE1
18
32
49
43
45
29
19
24
22
33
50
15
16
20
23
28
21
25
47
27
35
36
34
37
38
39
31
3
40
42
12
41
5
6
4
13
48
46
30
44
2
17
51
9
7
8
10
11
14
52
D0
D4
D1
D3
D2
D5
D6
PB6
PB4
4.75K
R208
STRB/R/W
4.75K
R207
4.75K
R204
4.75K
R216
4.75K
R218
4.75K
R201
4.75K
R203
4.75K
R205
4.75K
R206
4.75K
R217
4.75K
R202
REMOTE CURRENT
PB5
D0-D7
PB7
PC3
PC4
J1
5
J1
7
1.00K
R91
J1
3
D2
Q0
D7
LE
D0
Q2
Q1
D5
D6
Q3
Q4
Q5
Q6
Q7
OE
74HC573
D4
D1
D3
X20
12
1
16
19
2
6
15
9
11
4
8
3
7
5
17
18
13
14
1.00K
R93
1.00K
R92
LGND
J1
1
1.00K
R94
J1
6
PBO
NOT USED
NOT USED
NOT USED
PB3
PB2
PB1
ECLOCK
NOT USED
J1
4
J1
2
D7
D0-D7
NOT USED
STRA/AS
D41
X14
14
12
13
301
R33
100
R154
100
R160
100
R157
100
R159
100
R155
100
R156
100
R158
LCD CONTRAST TEMPERATURE COMPENSATION CIRCUIT
TP2
100K
R236
X14
7
5
6
133K
R7
3.32K
R88
J1
8
100
R109
MICROSWITCH
24VAC
windings )
( 1 of 5 XFMR
secondary
SWITCH
ARC START
AC/DC
+
10K
-
CONTROL
POT
REMOTE
SHUNT
400A/200mV
150
R52
J7
1
221K
R142
+
t
56
PTC1
J6
1
26.7
R138
33.2K
R141
26.7
R139
10K
R49
150
R51
J7
2
1.00K
R56
4.75K
R66
1.0
35V
C71
NGND
C76
4.75K
R53
1.00M
R54
NGND
J6
8
N+5V
NGND
J6
2
40V
600mA
Q14
40V
600mA
Q8
40V
600mA
Q13
10K
R172
10K
R122
10K
R128
HIGH
FREQ
WATER
J4
3
GAS
115V
G
MT2
MT1
TRI2
J4
1
267
R108
G
MT2
MT1
TRI3
475
R104
475
R103
1.00K
R228
G
MT2
MT1
TRI1
OCI9
2
6
1
4
OCI8
2
6
1
4
J4
2
267
R107
1.00K
R227
IOGND
L+5V
IO+5V
IOGND
NGND NGND NGND NGND NGND
10K
R125
J4
5
475
R102
267
R106
D0
50V
0.1
C78
X31
4
LGND
D4
D6
D3
D2
D1
D7
D0-D7
D5
1.00K
R68
LCDGND
J3
8
J3
14
R/W
100
R162
100
R163
50V
0.1
C62
100V
100p
C57
4.75K
R131
1.0A
30V
D42
4.75K
R130
X14
8
10
9
3.32K
R166
100V
100p
C52
J3
7
J3
5
3.32K
R167
J3
6
J3
4
J3
3
J3
11
J3
10
J3
13
J3
15
J3
16
3.32K
R150
100V
100p
C58
100V
100p
C54
100V
100p
C56
100V
100p
C59
100V
100p
C53
100V
100p
C51
100V
100p
C60
100V
100p
C55
LCDGND
LCDGND
LCDGND
D7
D6
D3
D2
D4
D1
D5
TP1
TP3
LCD CONTRAST CIRCUIT
DISPLAY
LCD
VDD
RS
Vo
VSS
E
4.75K
R97
J3
12
3.32K
R153
3.32K
R147
3.32K
R148
3.32K
R151
3.32K
R152
3.32K
R149
J3
9
J3
2
J3
1
D74
40V
600mA
Q10
.39mH
L3
5W
150
R235
5W
150
R164
100K
R222
+15V
D2
Q0
D7
LE
D0
Q2
Q1
D5
D6
Q3
Q4
Q5
Q6
Q7
OE
74HC573
D4
D1
D3
X21
12
1
16
19
2
6
15
9
11
4
8
3
7
5
17
18
13
14
D0
_
PIEZO
BUZZER
1.00K
R229
OCI10
2
6
1
4
115V
LED(+)
J4
4
.39mH
L2
+
J6
6
J6
13
D75
LED(-)
IOGND
IOGND
IOGND
IOGND
LCD+5V
NGND
VB
IOGND
HI_
NGND
X14
1
2
3
C73
LO_
1.00K
R144
REM CUR
50V
0.1
C75
2.21K
R50
1.00K
R41
1W
12V
DZ13
X11
8
9
10
C74
CUR_FB
50V
0.1
C72
CUR_FB
X31
2
NGND
IOGND
IOGND
X11
7
6
5
NGND
NGND
C77
3.32K
R143
X31
3
IOGND
D0
MT
10K
CW
R237
D2
D6
D4
D1
D7
D3
D5
LGND
2.67K
R34
2.21K
R101
.33mH
L1
LOW CURRENT FEEDBACK
4.75K
R213
4.75K
R209
HIGH CURRENT FEEDBACK
SCR 2,4
ZERO CROSS
SCR 1,3
DISPLAY E
VOLTAGE FEEDBACK
NOT USED
NOT USED
NOT USED
DISPLAY RS
D2
Q0
D7
LE
D0
Q2
Q1
D5
D6
Q3
Q4
Q5
Q6
Q7
OE
74HC573
D4
D1
D3
X22
12
1
16
19
2
6
15
9
11
4
8
3
7
5
17
18
13
14
3.32K
R146
LCDGND
LCDGND
LCDGND
-15V
LCD+5V
VOLTAGE FEEDBACK
ZERO CROSS
SCR 2,4
SCR 1,3
CAPACITORS =
UNLESS OTHERWISE SPECIFIED)
.022/50V
DIODES =
1A, 400V
01/03/94
(UNLESS OTHERWISE SPECIFIED)
SQUARE WAVE TIG 255 CONTROL BOARD
1/4W
(
MFD
GENERAL INFORMATION
UNLESS OTHERWISE SPECIFIED)
RESISTORS = Ohms (
A
A482.2
TO A482.1
DISPLAY COMMON
LGND
X31GND
NOISY COMMON
NGND
IOGND
X31 COMMON
PROCESSOR IO COMMON
X32 COMMON
LEGEND
(GROUND AND +5V NETS)
LCDGND
LOGIC COMMON
X32GND
PROCESSOR IO+5V SUPPLY
X31 +5V SUPPLY
NOISY+5V SUPPLY
L+5V
X32_+5V
N+5V
LCD+5V
X32 +5V SUPPLY
DISPLAY +5V SUPPLY
LOGIC +5V SUPPLY
IO+5V
X31_+5V
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.
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