Lincoln Electric SP-250 service manual Improper

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IDEALARC SP-250

NOTE: LincolnElectric Lincoln Electric. This Operator orTechnician

P2	J2
	1
	Q4

+5 V

L7

G-12

. Improper	information	assumes
PC boardrepairs	is provided for	noresponsibility

KEYPAD

P2	J2					2N4123			R11
	3								10K
					Q1
P2	J2				2N4123				R8
	5								10K
				Q2
P2	J2			2N4123					R9
	7								10K
			Q3
P2	J2	2N4123							R10
	9								10K
	Q20							R104
	2N4123
								10K
						+5 V
	D24		D25		D26		D27
		R12	1K	R13	1K	R14	1K	R15	1K
P2	J2
	2
P2	J2
	4
P2	J2
	6
P2	J2
	8
		D28		D29		D30		D31

3	Q A				+5 V
4	Q B	X7
5	Q C		A1	1
6	Q D		A2	2
10	Q E		CLK	8		X2 E
					12		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

											.33mH
												3.3K	R125	3.3K		R126
				11	B1			A1	9	9	R100		8
				12					8	10			7
					B2		X21	A2
				13					7	11			6
					B3			A3
				14	B4			A4	6	12	RES. NTWK.		5
				15					5	13			4
					B5			A5			100
				16					4	14			3
					B6			A6			.19W
				17	B7			A7	3	15			2
				18	B8	74HC245		A8	2	16			1
						DIR	OUT EN							C81
3	0D		Vcc	20
						1	19							100p
4	1D	X5	0Q	2										100V
7	2D		1Q	5								R54
8	3D		2Q	6								22K
13	4D		3Q	9
14	5D		4Q	12
17	6D		5Q	15								CW
															10
18	7D		6Q	16							R3	10K				X1
11				19
	/LE		7Q												9	A
10
	GND	74HC373	/OE	1
														R4	2.7K
				28
11	D0		Vcc
12	D1		A0	10
13	D2		A1	9											D69

3.3K R127 3.3K R128

C82 C83

100p 100p

100V 100V

R1

18K

1/2W

8

R2

330

R5

100

1/2W

3.3K	R129	3.3K	R130	3.3K		R131	3.3K		R132
									J1	9
										P1
									J1	10
										P1
									J1	11
										P1
									J1	12
										P1
									J1	13
										P1
									J1	14
										P1
									J1	15
										P1
									J1	16
C84		C85		C86			C87			P1
100p		100p		100p			100p
100V		100V		100V			100V		C88
									100p
									100V
									J1	5
										P1
									J1	4
	30V									P1
	1.0A	R135			R134			R133
	D20		3.3K			3.3K			3.3K
									J1	6
										P1
									J1	7
										P1

D0

D1

D2

D3

D4

D5

D6

D7

LCD

DISPLAY

Vo

VDD

RS

R/W

for liablilities resulting reference only. Lincoln could result indamage

+15 V

+5 V

R81

2.2K

R78

10K

10K

R76

R113

11

100

D58

X13

13

1/2W

1N4007

R82

2.2K

10

A

D64

1N4007

10K

R77

C48

9

R114

100

D59

X13

14

1/2W

1N4007

8

B

D62

R83

2.2K

10K

R79

1N4007

C49

7

R115

100

D60

X13

1

1/2W

1N4007

6

C

+5 V

D61

1N4007

C50

C31

R80

33K

10K

R97

C6

22p

CRYSTAL

R98

10K

15	D3	X4	A2	8
16	D4		A3	7							-5 V
17	D5		A4	6
18	D6		A5	5					5		6	9		8
19	D7		A6	4			+5 V			X20			X20
25	A8		A7	3						A			B
24	A9		Vpp	1
21	A10		CE	20					13	X20	12	11	X20	10
23	A11		OE	22						C			D
2	A12		A14	27					1
14	GND	27C64	A13	26
										X3	3	5		6
									2				X2
										A			A
						4
						5	X3	6
					+5 V		B
						9
						10	X3	8
							C
						13
						12	X3	11	3	X2	4
			1		2
				X2			D			C
				B

R6

100

1/2W

R7

100

1/2W

R124

20

5W

204

20	R102
5W

202

D55

203

D56

R70

3.9K

1/2W

								J1	8
		C90		C91			C11		P1
		100p		100p			0.1
		100V		100V			50V
		L1						J1	3
									P1
	.39mH								2
								J1
									P1
					D37
									1
		L2						J1	P1
		.39mH
		+15 V	D63
						R66
R103 + t	.25		470			1K			C30
						1/2W
	60V	R71	1/2W						4.7
									35V
			OCI1			R72
		1	4N35	5		1K
								Q15	204
								2N4123
		2	6	4					R75
		100K							100
		Q14	R73					Q16	1/2W
		2N4123
				R74	5.6K			2N4125

E

VSS

-LEDB

+LEDB

3

J8 P8

DZ4

15V D57SOL.

1W

	J8	4
		P8
		Q17
		15A
		60V
	SOLENOID
DZ5		DRIVER
16V
1W	CIRCUITRY

from board level troubleshooting. Electric discourages board level to the machine.

PC

100V

L3

INCR

1

.33mH

4.0MHz

10M

P5

J5

R16

J4

Y1

1/2W

130

3

533

P4

L4

C8

DECR

3

.33mH

22p

P5

J5

TO OPTIONAL

100V

PULL GUN

+5 V

TRIGGER

L5

4.7K

533A

TRIG

4

.33mH

R18

P4

P5

J5

R101

2

1K

IN

J4

COM

2

C52

X9

RES

P5

J5

0.1

50V

GND

C7

L6

R84

.33mH

1K

J3

J3

5W

8

11

+15 V

RESET

325

320

6.8K

THERM. LD. CONN.

R68

10K

R67

+

1

1K

A/D

C95

X17

8

R138

4.7

TL431

REF

CW

SUPPLY

35V

-

6

10K

R69

45		MOSI			Vdd	48
	46	SCK		A7/D7		38
	44	MISO		A6/D6		37
			X6
	47	I/O		A5/D5		36
	24	MODB		A4/D4		35
	25	MODA		A3/D3		34
	30	XTAL		A2/D2		33
	29	EXTAL		A1/D1		32
	40	/XIRQ		A0/D0		31
	39	/RES			AS	26
	22	VRH			A8	16
	6	IC1			A9	15
	20	A/D			A10	14
	18	A/D			A11	13
17		A/D			A12	12
	4	OC4			A13	11
	3	OC3			R/W	28
	7	IC2			E	27
19		A/D			A14	10
	41	/IRQ			A15	9
43		I/O	68HC11A1		I/O	5
8		I/O			I/O	42
23		Vss			OC2	2
21		VRL			I/O	1

FOR OPTION PLUG

+15 V

D75

R118

541A

1

5

7

8

4

6

68

J9

+5 V

1/2W

R119

22K

10

J4

J4

J4

J4

J4

J4

C45

D

+15 V

C55

14

.047

Q21

100V

20

X

Y

R120

G

18A

541A

-5 V

50V

X10

200V

+5 V

R20

4.7K

7

100

S

+15 V

C56

1/2W

9

D76

J9

DZ1

6

18V

539A

X19

1W

D72

1

R109

4.7K

A

5.6K

R25

7

6

+15 V

X11

1

R121

C44

D73

Q7

R28

7

A

27K

500mA

1/2W

300V

5.6K

Q8

5

Q6

2N4123

2

X19

2N4123

4

B

D35

750

R122

G

1/2W

R30

100

5

Q9

1/2W

2

2N4125

X11

DZ2

6.8K

4

B

R123

18V

_

1/2W

+15 V

1W

PIEZO

BUZZER

1.5K

C9

+

R31

1/2W

P7

P7

2

1

22K

R32

6

12

		204
5	J9	J6	6	P6
			541

PM

J9	J6	P6539
4		3

DQ11

18A 200V

S

MOTOR

CONTROL

CIRCUITRY

G1992 CONTROL

ELECTRICAL

IDEALARC SP-250

troubleshooting and	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

J7

J7

R34

9

X12

8

10

X12

11

Q10

A

B

3.3K

200mA

+5 V

R117

30V

+15 V

3.3K

9

R38

+5 V

14

X11

+15 V

2.7K

C13

6.8K

+15 V

C

8

R35

1/2W

.001

5

R19

4.7K

PIEZO BUZZER CIRCUITRY

400V

1

D32

3

X12

4

R39

J6

330

R36

15K

555

P6

9

8

R33

4.7K

C

47K

TACH

2

J6

R116

X2

P6

C17

D

13

206

C51

D34

11

2700p

X11

4

0.1

J6

50V

13

P6

50V

+5 V

+5 V

D

2

X12

1

10

D

C10

+5 V

R139

R63

100

102K

10K

1/2W

R37

15V

R112

R40

10K

C14

.25

D51

750

TACH CIRCUITRY

10K

18

270

7W

D70

R107

R106

R140

5

10K

R108

X13

C15

207

2

D

C29

R62

1/2W

D2

C25

D1

+15 V

D52

C27

39

10

100

.22

6

541A

P3

4

10V

J3

100V

D71

R56

56K

D47

2

ZERO-CROSSING

1/2W

1

+5 V

LINE SENSING

2

X1

R105

R59

R61

100

DETECTOR

DD1

D41

3

B

6.8K

6.8K

D49

16A

50

+15 V

R57

13

1

400V

3

C26

1.8K

X1

14

R60

P3

J3

R136

J9

3

7

J9

3.3K

R43

Q12

5W

R55

10K

1

5W

8A

R45

.27

D48

1/2W

12 D

2.2K

D38

208

.25

208A

150V

TP1

C22

D42

50V

7W

C94

D50

75V

.68

3.9K

.0047

R22

1.8K

C47

R111

20J

1400V

400V

1/2W

D44

1/2W

R52

R58

6.8K

35V

2

R137

2

8

500mA

R46

+5 V

4.7

10K

P3

J3

J9

J9

Q13

15K

204S

209

.25

209A

300V

8

DZ6

X15

9

+15 V

+5 V

C23

P3

J3

7W

C93

D40

1

6

18V

IN

OUT

.0047

.68

X18

1400V

400V

1W

D39

R99

C19

C21

56K

D53

TP2

GND

D45

100

1

TL431

DZ7

39

R51

1/2W

6

75V

10

3300

R48

20V

20J

1/2W

X14

8

50V

6.2V

X1

7

R53

R65

2W

TL431

1W

5

C

6.8K

10K

C16

6

common

D54

C28

3K

2200

R23

6.8K

R47

C24

CT. MAIN

63V

1/2W

C20

D46

R49

10K

.27

P3

J3

J9

J9

18

50V

VOLTAGE AND CURRENT

3

1

6

GND

15V

SENSING CIRCUITRY

206

206A

-5 V

C92

C18

DZ3

1K

X16

.0047

10

R44

10V

R50

50

IN

OUT

1400V

5W

2W

25V

5W

P3

J3

4

NOTES :

204

D43

POWER SUPPLIES

N.A. SINCE COMPONENTS OR CIRCUITRY ON A PRINTED

CIRCUIT BOARD MAY CHANGE WITHOUT AFFECTING

208

204

204S

THE INTERCHANGEABILITY OF A COMPLETE BOARD.

207

+

THIS DIAGRAM MAY NOT SHOW THE EXACT

G!

+

+ +

+

WELDING

OUTPUT

COMPONENTS OR CIRCUITRY OF CONTROLS HAVING

206

-

A COMMON CODE NUMBER.

TO GROUND

TO CIRCUIT BOARD

+15 V

209

204

202

G2

330

+15 V

R87

1/2W

202

OCI2

204

P3

J3

R85

5

4

H11C4

J3

P3

6

13

3

3

3

14

4

AUX TRANSFORMER

202

50

D65

R88

G1

DR.

6

C79

5W

15

1

2

10K

X19

C43

X11

C1

X13

C2

X12

C3

X1

C4

D66

270

203

.0047

1/2W

R86

R91

R89

LM2901

LM2901

LM2901

4066B

LM224

1400V

1/2W

TP3

2.2K

Q18

12

12

12

7

11

50V

2N4123

15J

C39

1.0

LABELS

P3

J3

35V

J3

P3

C5

LAST NO. USED

5

12

204A

204

SUPPLY

VOLTAGE NET

R-

140

CT. AUX.

TP5

C40

+15 V

-5 V

C-

95

1.0

50V

35V

204

POWER SUPPLY SOURCE POINT

D-

58

15J

R90

270

330

1/2W

COMMON CONNECTION

C80

15

D67

R94

1/2W

ACTUAL CIRCUIT

.0047

1/2W

R92

OF X10

1400V

OCI3

FRAME CONNECTION

3

4

1

2

P3

J3

5

4

H11C4

J3

P3

X20

A

R96

7

14

E

EARTH GROUND CONNECTION

203

50

D68

R93

G2

203

6

5W

10K

GATE DRIVE

1

2

1

X20

2

3

B

4

GENERAL INFORMATION

CIRCUITRY

Q19

F

R95

2N4123

2.2K

ELECTRICAL SYMBOLS PER E-1537

+5 V

11

X2

10

5

C

6

X

Y

CAPS. = ufd (.022/50V UNLESS OTHERWISE SPECIFIED)

F

RESISTORS = Ohms (1/4W UNLESS OTHERWISE SPECIFIED)

9

DIODES = 1A, 400V (UNLESS OTHERWISE SPECIFIED)

9

8

SCHEMATIC

D

10-19-90N

X19

14

SP250

74HC245

HEXINV

HEXINV

NAND

1

2

1

3

1

7

20

14

14

14

28

20

48

14

16

8

C

J5 ,

J6

J3

X21

C77

X20

C78

X2

C32

X3

C33

X4

C34

X5

C35

X6

C36

X7

C37

X8

C38

11

E

10

J7,J8

0.1

0.1

0.1

0.1

0.1

0.1

0.1

0.1

0.1

11

3

4

4

6

8

14

50V

50V

50V

50V

27C64

50V

74HC373

50V

68HC11A1

50V

74HC164

50V

74HC165

50V

X19

13

G

1

1

4

5

10

7

7

7

14

10

23

7

8

10

D

13

F

12

1922

J4

J9

5

8

6

10

PC BOARD SCHEMATIC

DIAGRAMS

G-12