Lincoln Electric SP-250 service manual Lincoln Electric. This information

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IDEALARC SP-250

Operator or Technician. Improper	Lincoln Electric. This information	NOTE: Lincoln Electric assumes
PC board repairs could result indamage	is provided for reference only. Lincoln	no responsibility for liablilities resulting

P2	J2
1
								Q1
P2	J2						600mA				R1
3								40V			10K
						Q2
P2	J2				600mA					R2
5						40V				10K
				Q3
P2	J2			600mA						R3
7				40V						10K
		Q4
P2	J2	600mA								R4
9			40V							10K
KEYPAD	Q5
	600mA								R5
	40V								10K
							+5 V
	D1		D2			D3		D4
		R6	1.00K	R7	1.00K		R8	1.00K	R9	1.00K
P2	J2
2
P2	J2
4
P2	J2
6
P2	J2
8
		D5		D6			D7		D8
		+15 V
						R190				C117
						4.75K
					R11	2.21K		R10
							5.62K
R14										11
100	D9		2.21K								X13
D10	1N4007									10	A
				R15
						C2
1N4007
R17										9
100	D11		2.21K								X13
	1N4007									8	B
D12		R18
1N4007
R20				C3						7
100	D13										X13
	1N4007									6	C
D14
1N4007			C4			C5		15.0K
							R23

3	Q A					+5 V
4	Q B	X7
5	Q C			A1	1
6	Q D			A2	2
10	Q E			CLK	8	12	X2	13
11	Q F			R	9
12	Q G	74HC164		Q H	13
		11	A			CLK1		2
		12	B	X8		Q H		9
		13	C			SS/PL		1
		14	D			Q H		7
		3	E			CLK2	15
		4	F			SA	10
		5	G	74HC165		H	6
		+5 V
		10K		R13

13

10K

R16

14

10K

R19

1

+5 V

								R30							+5 V
11	B1			A1	9				100
								100
12	B2	X21		A2	8
									R31
13					7
	B3			A3							R32
14	B4			A4	6						100
15	B5			A5	5						100
16	B6			A6	4
											R41
17	B7			A7	3
		74HC245
18	B8			A8	2							100
		DIR	OUT EN									R42
		1	19							100
										R43
													R44
													100			R45
	13	0D			Vcc	20										100
	8	1D	X5		0Q	12
	14	2D			1Q	9
	7	3D			2Q	15
	17	4D			3Q	6
	4	5D			4Q	16
	18	6D			5Q	5										CW
															R48
	3	7D			6Q	19										10K
	11	/LE			7Q	2
	10	GND 74HC373			/OE	1
		11	D0				Vcc	28
		12	D1				A0	10
		13	D2				A1	9
		15	D3		X4		A2	8
		16	D4				A3	7								-5 V
		17	D5				A4	6
		18	D6				A5	5				+5 V
		19	D7				A6	4					5		X20
		25	A8				A7	3							C
		24	A9				Vpp	1
		21	A10				CE	20					13		X20
		23	A11				OE	22							F
		2	A12				A14	27						12
		14	GND	27C256			A13	26
																X3
														13
																D
										1
										2	X3		3
											A
									+5 V
										9
										10	X3		8
											C
										4
										5	X3	6		1		X20
							5	X2	6
											B					A
								C

L1

.33mH

3.32K	R34	3.32K	R35	3.32K	R36
R33

					C11	C12
			C10		100p	100p
			100p		100V	100V
			100V
	R46
	22.1K
				R47
	12			22.1K
		X1		14	R49
	13	A			332		30V
							1.0A
	3.32K						D20
	R53
							R54
							100
	D21
							R55
							100
							R56
6	9			8			100
		X20
		D				R57
						20
12	11	X20	10			5W
					204
		E
11	3	X20		4		20
						5W	R58
		B
			202	203			R61
				D24
		D23
2						R66
						3.92K

3.32K		3.32K		3.32K		3.32K
	R37		R38		R39

C13	C14	C15	C16
100p	100p	100p	100p
100V	100V	100V	100V

		R50	3.32K	R51		R52
3.32K					3.32K
			C18		C19
			100p		100p
			100V		100V
	L2
	.39mH
		L3				D22
		.39mH
		+15 V
				D33
						R60
t .25			1.00K			1.00K
+	60V	R62	1.00K	R63
						R64
	OCI1		1		5	1.00K
	CNY17-3
			2	6	4
		Q12	475K
		600mA
		40V		R191	R68	5.62K

3.32K

R40

9D0

J1 P1

10D1

J1 P1

11D2

J1 P1

12D3

J1 P1

13D4

J1 P1

14D5

J1 P1

15D6

J1 P1

16D7

J1 P1

C17	LCD
100p	DISPLAY
100V

5Vo

J1 P1

4VDD

J1 P1

6RS

J1 P1

7R/W

J1 P1

8E

C20	J1	P1
0.1
50V

3VSS

J1 P1

2-LEDB

J1 P1

1+LEDB

J1 P1

			J8	3
				P8
	C21	DZ1	D34	SOL.
	4.7	15V
	35V	1W
			J8	4
				P8
Q10
600mA	204		Q11
40V
	R65		15A
			60V

100SOLENOID

Q13	DZ2	DRIVER
	16V
600mA	1W	CIRCUITRY
40V

G-13

IDEALARC SP-250

Electric discourages board level to the machine.	from board level troubleshooting.
troubleshooting and	PC Board repairs will
repair since it may compromise	invalidate your factory warranty.
the quality of the	Individual Printed
design and may result in danger to the Machine	Circuit Board Components are not available from

45

MOSI

Vdd

48

10K

10K

44

MISO

A6/D6

37

TO

515

541A

542

543

206A

495

+15 V

541A

46

SCK

A7/D7

38

33.2

D60

R24

R25

47

I/O

X6

A5/D5

36

OPTIONAL

R100

204

1

5

7

8

4

6

J5

J5

J5

24

MODB

A4/D4

35

SPOOL GUN

22.1K

10

9

25

34

J4

J4

J4 J4

J4

J4

R101

R102

.047

1

13

541

MODA

A3/D3

C50

L4

C30

CRYSTAL

30

XTAL

A2/D2

33

+15 V

33.2

14

100V

D

Q20

J5

22p

+5 V

X

Y

G

PM

INCR

100V

29

EXTAL

A1/D1

32

X10

R103

18A

6

.33mH

-5 V

2

3 S

200V

J4

326

40

/XIRQ

A0/D0

31

541A

C51

7

100

20

J5

J5

539

39

/RES

AS

26

+5 V

C52

8

3

4.0MHz

10M

50V

D61

12

11

324A

P4

J5

Y1

R70

1/2W

22

IC1

A9

16

R89

4.75K

R90

18V

J5

6

15

L5

130

475

DECR

14

.33mH

20

A/D

A10

14

+15 V

1W

TO OPTIONAL

327

D50

C31

18

A/D

A11

13

4.75K

6

R91

SPOOL GUN

22p

17

A/D

A12

12

1

X11

8

R104

5.62K

+15 V

L6

100V

4

OC4

A13

11

C

14

TRIG

J5

RESET

7

X11

7

+5 V

3

OC3

R/W

28

Q21

R106

P4

.33mH

C40

D51

9

A

325A

324

7

27

R105

500mA

J5

IC2

E

26.7K

300V

5.62K

2

Q22

COM

R71

19

A/D

A14

10

325

4

41

9

11

Q23

600mA

J4

4.75K

/IRQ

A15

13

600mA

40V

R72

5

OC5

I/O

43

X11

40V

D

Q24

68HC11A1

D62

L7

VDD

1.00K

8

IC3

I/O

42

10

D

G

18A

.33mH

C32

X9

RES

23

R107

750

R108

200V

0.1

Vss

OC2

2

S

R189

1.50K

50V

S-8054HN

C33

21

VRL

I/O

1

Q14

5

100

VSS

2

B

_

2

Q25

600mA

P7

1K

40V

J7

PIEZO

X11

600mA

DZ4

4

B

40V

R74

5W

R92

P7

R

BUZZER

6.81K

18V

R109

1W

R188

A/D

+15 V

3.32K

1

+

+15 V

1.50K

+15 V

J7

SUPPLY

R110

1.50K

C53

MOTOR

R77

22.1K

CONTROL

R187

PIEZO BUZZER CIRCUITRY

J6

J6

6.81K

15.0K

10K

R111

CIRCUITRY

14

15

R78

6

5

325A

320

R112

8

X12

9

3

X12

4

1

+

THERM. LD. CONN.

+5 V

3.32K

A

B

1K

REF

TL431

+15 V

R79

+5 V

+5 V

CW

8

X17

C34

+5 V

6

-

R113

4.7

9

35V

D52

X19

+15 V

6.81K

10K

14

C54

TACH CIRCUITRY

L14

10K

D53

C

R114

2.67K

.33mH

R80

R93

+5 V

8

.001

12

R94

R95

400V

515B

3

J5

D40

R81

4.75K

5

100

16.5K

R115

15.0K

10

X12

11

R116

TACH

R82

X2

ZERO-CROSSING

X19

D54

100V

R96

C41

R97

R136

C

1

4

2

A

C42

10K

1.50K

47.5K

555

J5

11

10

.22

4.75K

332

C36

D

DETECTOR

LINE SENSING

11

13

206B

J5

C35

D41

X19

2700p

2

0.1

13

D

50V

1

X12

2

50V

L8

C57

10

D

207

.33mH

+5 V

.33mH

208

207

VOLTAGE SENSING

C55

267

.25

R118

R119

5

J6

L13

541A

750

R117

15V

7W

18

R120

D70

CIRCUITRY

R121

J9

J9

39

28.0K

+15 V

C56

2

R122

100

208

2

5

10V

D71

X1

1

6.81K

D72

R123

C60

28.0K

3

B

J6

CURRENT SENSING

16

R140

L10

CIRCUITRY

208

.25

C70

DD1

D80

R125

R126

+5 V

T1

7W

.68

D73

.33mH

C71

400V

16A

Q30

50

POWER SUPPLIES

L11

511

51.1K

TP1

400V

+15 V

10K

R124

.0047

8A

50V

511

75V

R144

5W

C61

R127

1400V

150V

.27

.33mH

1

NULL

NULL

8

D74

209

20J

10

R145

J6

J6

2

INPUT

V CC

7

2W

Q31

D82

3

INPUT X22

OUT

6

3.92K

13

11

100

209

J6

500mA

R146

15.0K

D83

4

VEE

NC

5

300V

R129

7

R141

R130

206S

-

+

205

R131

D75

TP2

.0047

R143

R147

X15

OP27

T1

.25

3.3K

8

51.1K

7W

+5 V

28.0K

C72

5W

+15 V

SHUNT

C62

+5 V

75V

1400V

DZ5

IN

OUT

20J

D85

D86

1

X18

6

18V

1W

D77

R148

C73

GND

C74

D76

100

1

TL431

DZ6

39

6

3300

C75

20V

7

X14

8

50V

6.2V

X1

R133

R134

.68

1W

common

TL431

5

C

6.81K

D79

10K

400V

L12

C78

6

C63

6.81K

28.0K

.33mH

2200

R149

R150

3.01K

C64

THERMOSTAT SENSING

63V

CT. MAIN

C79

R135

50V

D78

CIRCUITRY

J6

J9

GND

18

.27

206

4

J9

1

4

206A

15V

-5 V

T1

TP4

C80

C81

DZ7

X16

150V

.0047

R152

R153

IN

OUT

2W

5W

25V

5W

80J

1400V

10

1K

50

10V

J6

6

NOTES :

D87

+15 V

N.A. SINCE COMPONENTS OR CIRCUITRY ON A PRINTED

204

207

CIRCUIT BOARD MAY CHANGE WITHOUT AFFECTING

TP5

THE INTERCHANGEABILITY OF A COMPLETE BOARD.

130V

3

3

3

14

4

7

+15 V

38J

THIS DIAGRAM MAY NOT SHOW THE EXACT

X19

C100

X11

C101

X13

C102

X12

C103

X1

C104

X22

C105

COMPONENTS OR CIRCUITRY OF CONTROLS HAVING

681

681

LM2901

LM2901

LM2901

4066B

LM224

OP27

R160

R161

A COMMON CODE NUMBER.

202

12

12

12

7

11

4

OCI2

J3

R162

5

4

H11C4

J3

C106

LABELS

1

5

C107

202

50

D90

6

R163

G1

SUPPLY

VOLTAGE NET

T1

5W

10K

C90

33.2

D91

1

2

R164

R165

26.7

+5 V

POWER SUPPLY SOURCE POINT

.0047

R166

600mA

R167

562

R168

562

-5 V

1400V

Q40

TP6

2.21K

40V

LAST NO. USED

50V

COMMON CONNECTION

C91

GATE DRIVE

15J

1.0

R-

191

J3

35V

CIRCUITRY

J3 6

FRAME CONNECTION

C-

117

2

+15 V

20

14

14

14

28

D-

93

204A

C92

204

EARTH GROUND CONNECTION

CT. AUX.

TP7

1.0

X21

C108

X20

C109

X2

C110

X3

C111

X4

C112

T1

35V

0.1

0.1

0.1

0.1

0.1

50V

204

74HC245

HEXINV

HEXINV

NAND

50V

50V

50V

50V

27C64

50V

15J

B

BLACK LEAD

R169

R170

R171

R172

562

R173

562

R174

R

RED LEAD

1400V

33.2

26.7

681

681

10

7

7

7

14

203

D92

.0047

C93

																			OCI3								+5 V
											J3						5	4	H11C4		J3
												R175
			GENERAL INFORMATION								3			D93				6	R176		G2	7
											T1	50
											203
												5W							10K
			ELECTRICAL SYMBOLS PER E-1537														1	2
			CAPS. = ufd (.022/50V UNLESS OTHERWISE SPECIFIED)																Q41			20			48		14		16
																															ACTUAL CIRCUIT
			RESISTORS = Ohms (1/4W UNLESS OTHERWISE SPECIFIED)														R177		600mA
																																OF X10
			DIODES = 1A, 400V (UNLESS OTHERWISE SPECIFIED)														2.21K		40V	7		X5		C113	X6	C114	X7	C115	X8	C116
																								0.1		0.1		0.1		0.1
																															1		2
																				X19	1	74HC373		50V	68HC11A1	50V	74HC164	50V	74HC165	50V		A
			1							16
																				6
			J1																			10			23		7		8
						5																									3	B	4
							1			9									1		2
											T1 SECONDARY									X2
		SP					J2			TOP
												204				204S	+														5		6
												208					207															C
		250CONTROL																												X			Y
	SCHEMATIC					10						G1	+	+	+	+	WELDING		3		4					T1 AUX.
G																				5												E
					1		1	3									OUTPUT			X2
10			1	2		4			1	6												10				202
												206
-9			J7																					8							9		8
-																	-						X1									D
92C					J4		J9	J3											9		8
			J8																	X2		9
																										204A
					5	8	4		7	12		209
			3	4				6																							11		10
					1		7	1		8		G2

2251	J5		J6	TO GROUND	TO CIRCUIT	4	2	203
					BOARD	X13
								13	12
									F
	8	14	9	16

G2252 CONTROL PC BOARD SCHEMATIC

ELECTRICAL DIAGRAMS

G-13