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G-7
ELECTRICAL DIAGRAMS
IDEALARC DC400
Control PC Board (G2588) Schematic
1400V
.0047
C51
RF
+15V
-10V
+15V +15V
10K
R85
1.50K
R301
50V
4
C33
1N4004
D55
475K
R128
1N4004
D57
1.00M
R80
1N4004
D56
100K
R59
-7.5V
X2
8
10
9
475K
R99
10K
R123
+15V
1N4004
D59
VOLTAGE BUFFER
RECTIFIER BRIDGE
+15V
1N4004
D41
1.8
20V
C32
1N4004
D60
100
R126
1N4004
D42
1N4004
D61
10K
R98
2N4857
Q1
1N4004
D40
1W
15V
DZ6
1.8
20V
C15
102K
R100
X2
7
5
6
61.9K
R122
1.50K
R97
13.7K
R300
13.7K
R96
X3
14
13
12
-10V
SWITCH
CURRENT
PROTECTION
OVER-VOLTAGE
CAPACITOR
82.5K
R132
100
R127
100K
R57
X4
1
2
3
2.21K
R50
4.7
35V
C44
R328
R321
R320
R319
R318
R316
R317
R322
100K
R153
10W
160
R151
J1
7
R327
1W
6.2V
DZ12
R323
R324
1N4004
D77
1N4004
D76
1N4004
D78
R326
R325
41
NOTES :
NOT SHOW THE EXACT COMPONENTS OR CIRCUITRY OF CONTROLS HAVING A COMMON CODE
WITHOUT AFFECTING THE INTERCHANGEABILITY OF A COMPLETE BOARD, THIS DIAGRAM MAY
NUMBER.
N.A. SINCE COMPONENTS OR CIRCUITRY ON A PRINTED CIRCUIT BOARD MAY CHANGE
FILE: G2586-1BD
C
-7.5V
+15V
+15V
100K
R42
-10V
10K
R138
15W
1.5K
R149
1N4004
D25
475K
R131
X1
14
12
13
100
R152
J2
1
X1
8
10
9
1N4004
D30
10K
R48
1N4004
D75
5W
15V
DZ13
1N4004
D26
CNY17-3
OCI1
42
1
6
5
1N4004
D29
J2
4
22.1K
R130
-10V
+15V
ARC FORCE
CONTROL
MODE BUFFER
ARC FORCE AMP
POT.
204
209
10K
10K
R46
CC LOW VOLTAGE
CC MAX
OUTPUT
STABILIZER
208
15W
1.5K
R150
10K
R47
47.5K
R111
1.50K
R304
OUTPUT
10K
CONTROL
POT.
50V
.022
C19
10K
CW
R71
CW
10K
R67
MODE INVERTER
75
10K
R68
-7.5V
-7.5V
+15V
-10V
50V
.022
C18
RF
J2
10
-10V
+15V
+15V
CV MAX
MIN. OUTPUT BUFFER
OUTPUT
+
t
56
R78
1N4004
D34
212
213
BUFFER
MAX.
OUTPUT
2N4857
Q3
+
t
56
R81
RF
100
R75
X1
7
5
6
267K
R74
392K
R73
J2
8
267K
R72
1N4004
D35
RF
100K
R105
1.82K
R115
4.75K
R93
100K
R315
1.8
20V
C22
15.0K
R94
+15V
1N4004
D62
1N4004
D28
475K
R69
2N4857
Q4
1N4004
D27
5.1V
DZ7
1.50K
R54
332K
R52
10K
R70
10K
R53
100K
R51
100K
R49
750
R305
267
R76
750
R77
1N4004
D33
J2
9
50V
.022
C17
1N4004
D32
+
t
56
R79
X1
1
2
3
1N4004
D13
LM224
X4
4
11
1N4004
D16
102K
R119
J3
1
50V
.022
C10
J3
2
J3
4
1N4004
D10
G1
+15V
EARTH GROUND CONNECTION
COMMON CONNECTION
.022/50V
(UNLESS OTHERWISE SPECIFIED)
GENERAL INFORMATION
1A, 400V
RESISTORS = Ohms (
(
ELECTRICAL SYMBOLS PER E1537
1/4W
CONTROL BOARD SCHEMATIC
IDEALARC DC400
FRAME CONNECTION
SUPPLY
LABELS
POWER SUPPLY SOURCE POINT
G3
UNLESS OTHERWISE SPECIFIED)
UNLESS OTHERWISE SPECIFIED)
CAPACITORS =
MFD
DIODES =
100K
R30
1N4004
D18
562
R32
1N4004
D15
562
R311
50K
CW
R28
50V
.022
C12
50V
.022
C9
562
R34
100K
R31
203
10K
R145
X4
8
10
9
10K
R144
1N4005
D73
1N4005
D71
GND
IN
OUT
X5
1N4005
D70
1N4005
D72
201
202
10W
250
R148
RF
1W
2.7
R155
150
50V
C43
5W
17V
DZ9
10K
R147
500
50V
C40
1W
2.7
R154
31.6K
R118
1N4005
D69
1N4005
D68
2K
CW
R117
1N4004
D22
10K
R142
1N4004
D82
+
REF
-
TL431
X7
1
6
8
10K
R91
10K
R64
10K
R116
1N4004
D49
1N4004
D48
5W
10V
DZ10
1.00K
R63
-10V
A
+15V
M
50V
.022
C34
10K
R143
221K
R156
1N4005
D19
10K
R140
J1
3
J1
2
47
35V
C39
J1
1
1N4004
D74
1N4005
D21
1N4005
D20
1N4004
D23
5W
1K
R141
D
2586
G
220
202
POWER UP
OUTPUT CLAMP
201
203
J2
3
J1
6
LM224
X3
4
11
2.67K
R146
1N4004
D79
LM224
X1
4
11
+15V
4.7
35V
C41
LM224
X2
4
11
50V
.022
C30
1N4004
D63
1.00M
R66
50V
4
C24
15.0K
R134
68.1K
R124
475K
R62
50V
.68
C35
1N4004
D64
33.2K
R65
22.1K
R95
15.0K
R90
10K
R83
1N4004
D36
1N4004
D50
15.0K
R139
1N4004
D37
50V
0.1
C56
1N4004
D47
475K
R89
X3
8
9
10
X3
1
2
3
1N4004
D31
CC CONTROL AMP
1N4004
D52
X4
12
14
13
1N4004
D46
221K
R135
1N4004
D54
26.7K
R125
22.1K
R129
X3
7
5
6
RF
+15V
-10V
LIMITER
CC CURRENT
C.V. CONTROL
START PRESET
LIMITER
CV CURRENT
1.8
20V
C20
33.2K
R88
200V
.33
C23
100K
R137
2N4857
Q8
4.7
35V
C36
1N4004
D51
X2
1
3
2
2N4123
Q5
26.7K
R44
1N4004
D58
4.75K
R82
C59
C58
C68
C57
-10V
C67
200
R307
267
R24
267
R23
200
R306
B
1W
15V
DZ4
13.7K
R40
225
13.7K
R108
100V
.047
C38
J2
11
100V
.047
C37
J2
12
J2
6
J2
5
13.7K
R303
475
R36
1N4004
D45
C45
475
R35
J2
2
-10V
1N4004
D44
13.7K
R302
1400V
.0047
C14
J1
9
2
240
204
4
214
1N4004
D24
100
R45
100K
R41
50V
.022
C16
243
R312
1N4004
D80
J1
10
243
R313
J1
4
5W
24V
DZ14
1N4004
D81
R316-R328=68.1k 1/4W
243
R314
J1
8
.22
100V
C26
24.9
R38
475
R37
22.1K
R55
2.21K
R58
33.2K
R102
RG1
REF
RG2
X6
8
1
5
3
6
2
267K
R104
1N4004
D53
1N4004
D43
475K
R106
.047
100V
C25
5.62K
R110
26.7K
R107
X2
14
13
12
332K
R101
1.50K
R109
1W
30V
DZ8
1.00M
R103
+15V
1.00K
R20
QU1
5W
68
R114
202
1N4004
D67
267
R25
200
R308
201
1/2W
27
R3
1N4004
D66
4.7
35V
C1
5W
68
R112
1W
15V
DZ1
RF
J
I
H
N
4.7
35V
C2
1W
15V
DZ2
5W
68
R113
1/2W
27
R2
475
R10
1N4004
D4
100K
R12
100V
.15
C5
4.75K
R18
400V
4A
SCR3
1N4004
D2
1N4004
D65
1/2W
27
R1
D
G
S
15A
60V
Q2
1N4004
D8
1N4004
D7
267
R14
1W
15V
DZ5
400V
4A
SCR1
1.00K
R21
2.67K
R4
1N4004
D1
100K
R11
4.75K
R17
400V
4A
SCR2
QU2
267
R15
2.67K
R5
1N4004
D5
2.67K
R7
100V
.15
C4
475
R86
2.67K
R8
267
R16
1.00K
R22
203
1N4004
D3
475
R87
FIRING CIRCUIT
100K
R13
QU3
100V
.15
C6
4.75K
R19
1N4004
D9
1N4004
D6
1W
15V
DZ3
2.67K
R9
4.7
35V
C3
2.67K
R6
G
SHT.
82
LAST NO. USED
68
C-
R-
D-
NO.
328
2586
VOLTAGE NET
X6
AD620
7
4
50V
.022
C31
X4
7
5
6
51.1K
R120
C61
+15V
-7.5V
204
G2
33.2K
R121
C60
J3
3
1N4004
D14
50K
CW
R27
562
R33
1N4004
D11
562
R309
562
R310
100K
R29
50V
.022
C7
1N4004
D17
50K
CW
R26
50V
.022
C11
50V
.022
C8
1N4004
D12
206
205
CURRENT AMP
J2
7
+15V
J1
5
E
10K
R56
L
K
2N4857
Q6
6.81K
R61
3.01K
R60
+15V
-10V
RF
+15V
F
-7.5V
+15V
G
B
3-11-94
G-7
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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.