Lincoln Electric SVM169-A service manual PC Board Assembly Control G4551-1

PRECISION TIG 185

G-7	ELECTRICAL DIAGRAMS	G-7
PC BOARD ASSEMBLY - CONTROL - (G4551-1)

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EN-170

1-G4551	ENGINEERING CONTROLLED		CHANGE DETAIL: REVISED IDENTIFICATION CODE, SCHEMATIC REFERENCE, BUY PART NUMBER AND ITEM 40.
	MANUFACTURER:	Yes
	N.F.		N.C.,N.D.	N.C.	N.J.	N.C.	N.C., N.D.

DISP1	LED2	XX X X X XX
LED1
S1		X	X
		X	X
			A1
	LED6	XX X X X X X

LED3

X X X X X X

X

X

X X X X X X

X

X

X X X X X X

X

X

R1

R2

R3

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

LED4

X

X

X

X

X

X

X X X X X

X X X X X

X X X X X

LED5

N.C.

N.E.

N.C., N.D., N.H. (3 PLACES)

OPPOSITE COMPONENT SIDE

1

N.K.

5.01

6.00

R11

D1

R12

R13

R14

R15

5.83

R7

R8

C3

R9

C4

C1

C2

R5

R6

R10

D2

C6

DZ1

R4

R16

R17

C5

R18

J1

C7

R19

R20

C8

C13

1- C9

R21

R22

R30 R23

R31 C10

R32 C11

R33 C12

R24

C17

C14

R34C15

C23

Q1

C16

DZ2

R25

T1

C18

R26

R27

R28

R29

MOV1

MOV2

MOV3

X2

D3

Q2

PT185

R35

R36

5.13

CONTROL

R59

C27G4551

C28 C109

R60 C22

R61

R212

R211

R38 C30R62

R48R63

R39

R49 R37

C19

R215 R204

R50

Q3

Q4

C20

D7

C32 C24

R55 R42

R56 R43

R57 R44

R58 R45

C25

C26

J2

C110

C21

R194

C111

R216 R51

C34

R70

R53

R41

D4

X3

C29

D40

R203

R46

Q5

R47

TP4

D5

MOV4

X4

TP1 TP2

D6

R52

T2

R54

N.K.

MOV5

C31

R64

D11

C36

TP3C37

C35R79

R210

R209

R71

C38

C39C42

R80

R81

R65

R82

R66

R83 R67

C43 C33

R195

C112

R68

R69

Q6

C40

Q8

R75

Q9

C45

R86

R87

R88

R89

C44

DZ4R85

D8

C41

D14

R78

X5

D12

D13

R90R103

R91R104

LED7

D41

DZ3

R73

R74

R72

D9

D10

Q7

R76

R77

N.B.

D15

D16

J6

R92

R93

X1

D19

R84

R96

R97

R100

R101

R102

R201

D17

D18

R94

R95

R205

Q10

R98

R99

R199

C46

C47

C48

R206

C50

N.G.

LED9

C58

C49

X6

X7

C52

C53

R106

R107

D22 C57

C51

R105

R108

R213

X8

R196

R198

R119

R120

R121R112

C66

R122

R123

R124 C55

R109

R125

C113

R208

C62

R117 R114

C56

C63

X9

C64

R115

C59

D21

C65

LED8

R202

C60

D24

D25

D26

D27

J3

C68

C67

R118

C61

Q11

R207

R110

C54

R200

R197

R111

R113

Q12

D20

X10

Q13

DZ5

D23

R214

X11

X12

R116

TP5

TP7

C69

D28

R126

D29

D30

R127

C71

C72

TRI2

TRI4

MOV6

MOV7

MOV8

X13

R128

X14

C70

D31

C74

C75

R129

R130

R131

C76

R132

C77

R133

R134

C73

R135

TRI1

TRI3

C79

C80

C81

C82

C83

C84

R137

C85

R138

R139

L1

L2

R136

C78

C86

J4

DZ6

R141

R142

N.K.

R153

R154

DZ7

D33

C93

R140

C87

C88

L3

C97

OCI1

C89

R143

R144

C90

R145

R146

C91

R147

R148

C92

R149

R150

C98

D32

DZ8

R162

Q14

Q16

R151

R152

C94

R155

R156

R160

C96

Q15

C95

R158

R159

R157

DZ9

R161

OCI2

OCI3

OCI4

OCI5

R163

R164

R165

C99

D34

R187

R171

C107

R166

R181R189

C102

L4

L5

J5

R177

C100

R178

R172

R173

R174

R182

C103

R183

R167

R184

Q18

R185

R188

C108

R186R190 R170

R191

R192

R193

R168

R169

D35

R175

R176

C101

Q17

DZ10

R179

R180

C104

C105

C106

D36

D37

N.K.

.23

TP6

D38

D39

0

N.K.

8.81

.21

0

9.00

COMPONENT SIDE

		ITEM	REQ		PART NO.	DESCRIPTION
		1	1		G4551-B	PRECISION TIG 185 CONTROL PCB BLANK
		2	1		S25864-4	PSOC SOFTWARE
		3	AS NEEDED		E2861	SEALANT
			FOR ITEMS BELOW, REFER TO ELECTRONIC COMPONENTS DATABASE FOR CURRENT SPECIFICATIONS
		ITEM	REFERENCES	QTY	PART NUMBER	DESCRIPTION
		4	A1	1	M17789-4	ENCODER,INCREMENTAL,2-BIT,PEC12
		5	C1,C3,C29,C39,C41-	21	S25020-2SMT	CAPACITOR,SMD,CERAMIC,0.022MF,50V,10%,X7R,S0805
			C43,C58,C60,C78,C84,
			C89-C92,C94-C95,C103-
			C104,C109-C110
		6	C2,C10,C35,C111	4	S25020-9SMT	CAPACITOR,SMD,CERAMIC,47pF,50V,5%,COG,S0805
		7	C4,C23,C38	3	S25024-2SMT	CAPACITOR,SMD,TANTALUM,1.0MF,35V,10%,S3528
		8	C5,C20,C45	3	S25020-12SMT	CAPACITOR,SMD,CERAMIC,100pF,100V,5%,COG,S0805
		9	C6-C7,C9,C12,C17-	14	S25020-10SMT	CAPACITOR,SMD,CERAMIC,4700pF,50V,10%,XR7,S0805
			C18,C24,C30-
			C32,C34,C44,C53,C59
		10	C8,C13,C25-C26	4	S20500-17	CAPACITOR,PPMF,0.1MF,630V,5%,BOX
		11	C11,C14,C19,C21-	32	S25020-3SMT	CAPACITOR,SMD,CERAMIC,0.1MF,50V,10%,X7R,S0805
			C22,C33,C48,C50-
			C52,C55-
			C56,C62,C64,C66,C68,
			C74-C76,C79-
			C83,C85,C93,C98,C100
			,C105,C107-C108,C112
		12	C15,C63	2	S25020-4SMT	CAPACITOR,SMD,CERAMIC,820pF,50V,5%,COG,S0805
		13	C16,C40,C113	3	S25020-14SMT	CAPACITOR,SMD,CERAMIC,330pF,100V,5%,COG,S0805
		14	C27,C36-C37	3	S25020-7SMT	CAPACITOR,SMD,CERAMIC,0.22MF,50V,20%,X7R,S1812
		15	C28	1	S25020-24SMT	CAPACITOR,SMD,CERAMIC,1.0MF,25V,10% ,X7R,S1206
		16	C46,C49	2	S13490-199	CAPACITOR,ALEL,220,25V,20%,LOW-ESR
		17	C47	1	S13490-179	CAPACITOR,ALEL,1000,35V,20%
		18	C54,C69-	9	T11577-52	CAPACITOR,CD,.0047/.005,1400V,20%
			C70,C73,C86,C96,C99,
			C101,C106
		19	C57,C61,C65	3	S13490-197	CAPACITOR,ALEL,82,35V,20%,LOW-ESR
		20	C67,C77	2	S25020-5SMT	CAPACITOR,SMD,CERAMIC,2700pF,50V,5%,X7R,S0805
		21	C71-C72,C87-C88,C102	5	T11577-58	CAPACITOR,CD,.0047,3000V,20%
		22	C97	1	S13490-181	CAP,ALEL,22,63V,20%
		23	DISP1	1	S17395-11	LED,DISPLAY,7-SEGMENT,CC,3-DIGIT
		24	DZ1,DZ8,DZ10	3	S25046-4SMT	ZENER DIODE,SMD,0.5W,12V,5%,SOD-123
		25	DZ2-DZ3	2	S25046-3SMT	ZENER DIODE,SMD,0.5W,18V, 5%,SOD123
		26	DZ4	1	S25046-1SMT	ZENER DIODE,SMD,0.5W,5.1V, 5%,SOD123
		27	DZ5-DZ6	2	S25045-1SMT	ZENER_DIODE,SMD,225mW,12V,5%,SOT-23
		28	DZ7,DZ9	2	S25044-3SMT	ZENER DIODE,SMD,3W,12V,5%, SMB
		29	D1-D3,D5,D7-D8,D21-	8	S25040-1SMT	DIODE,SMD,1A,400V,FAST RECOVERY,DO-214BA
			D22
		30	D4,D6,D16,D18-	12	S25040-5SMT	DIODE,SMD,DUAL,0.200A,70V,UFR
			D20,D28,D31-
			D32,D35,D40-D41
		31	D9-D15,D17,D23,D29-	17	S25040-2SMT	DIODE,SMD,1A,400V,DO-214BA/AC
			D30,D33-D34,D36-D39
		32	D24-D27	4	S25040-10SMT	DIODE,SMD,3A,400V,D0-214AB
		33	J1	1	S24020-2G	CONNECTOR,MOLEX,MINI,PCB,2-PIN,GOLD
		34	J2	1	S24020-8	CONNECTOR,MOLEX,MINI,PCB,8-PIN,TIN
N.C.		35	J3	1	S24020-12	CONNECTOR,MOLEX,MINI,PCB,12-PIN,TIN
		36	J4	1	S24020-4	CONNECTOR,MOLEX,MINI,PCB,4-PIN,TIN
		37	J5	1	S24020-6	CONNECTOR,MOLEX,MINI,PCB,6-PIN,TIN
		38	J6	1	S18248-4	CONNECTOR,MOLEX,MINI,PCB,4-PIN
		39	LED1	1	T13657-2	LED,T-1,3/4,RED,HLMP-3003
		40	LED2,LED6	2	T13657-14	LED,T-1,3/4,AMBER,HIGH-INTENSITY
		41	LED3-LED5	3	T13657-3	LED,T-1,3/4,GREEN,HLMP-3502
		42	LED7-LED9	3	S25080-2SMT	LED,SMD,GREEN,CLEAR,S1206
		43	L1-L5	5	T12218-9	CHOKE,RF,390UH,5%, 225MA,CONFORMAL
		44	MOV1	1	T13640-16	MOV,150VRMS,80J,20MM
		45	MOV2-MOV5	4	T13640-25	MOV,130VRMS,90J,20MM
	N.A.	46	MOV6-MOV8	3	T13640-18	MOV,320VRMS,150J,20MM
		47	OCI1	1	S15000-34SMT	IC,SMD,OPTOCOUPLER,HMA124
		48	OCI2-OCI5	4	S15000-16	OPTOCOUPLER,TRIAC,DRIVER,ZVC,3083
		49	Q1,Q6	2	S25051-11SMT	TRANSISTOR,SMD,NMF,DPAK,TO-252,48A,100V(SS)
		50	Q2-Q3,Q5,Q7,Q9-	12	S25050-1SMT	TRANSISTOR,SMD,NPN,0.5A,40V,SOT-23,MMBT4401LT1
			Q10,Q12-Q13,Q15-Q18
		51	Q4,Q8,Q11,Q14	4	S25050-2SMT	TRANSISTOR,SMS,PNP,SOT23,0.5A, 40V,MMBT4403LT1
		52	R1-R3	3	T10812-116	POT,SINGLE-TURN,0.25W,10K,10%

	CAPACITORS = MFD / VOLTS	N.A.,N.B.
	RESISTORS = OHMS
NOTES:
N.A.	THIS DEVICE IS SUBJECT TO DAMAGE BY STATIC ELECTRICITY, SEE E2454 BEFORE
	HANDLING.	N.A.
N.B.	PROGRAM X1 WITH ITEM 2.
N.C.	KEEP FREE OF ENCAPSULATION MATERIAL.
N.D.	SEAL COMPONENT BY APPLYING ITEM3 AS SHOWN SO THAT ENCAPSULATION MATERIAL
	DOES NOT GET INSIDE COMPONENT.
N.E.	KEEP FREE OF ENCAPSULATION MATERIAL (.50 DIA. MIN.) ON BOTH SIDES OF BOARD.
N.F.	KEEP MOUNTING HOLES FREE OF ENCAPSULATION MATERIAL (5 PLACES).
N.G.	COVER MOLEX WITH TAPE.
N.H.	HAND TIGHT MOUNTING WASHER AND MOUNTING NUT TO POTENTIOMETER BUSHING.
N.J.	WHEN ASSEMBLING DISPLAY, SPACE DISPLAY OFF THE BOARD .125+/- .010 MEASURED
	FROM BOTTOM OF DISPLAY TO PC BOARD SURFACE.
N.K.	SQUEEZE COMPONENTS TOGETHER BEFORE ENCAPSULATION.

53	R4,R49-R50,R68-	11	S25000-1002SMT	RESISTOR,SMD,METAL FILM,1/10W,10.0K,1%,S0805
	R69,R72,R107,R122,R1
	32,R162,R184
54	R5,R16-R17,R30-	15	S25000-1001SMT	RESISTOR,SMD,METAL FILM,1/10W,1.00K,1%,S0805
	R32,R51,R60-
	R61,R92,R194-
	R195,R208,R212,R215
55	R6	1	S25000-1500SMT	RESISTOR,SMD,METAL FILM,1/10W,150OHMS,1%,S0805
56	R7,R9,R111-	16	S25001-1001SMT	RESISTOR,SMD,1K,1/4W,1206,1%,TR
	R113,R135,R143,R145,
	R147,R149,R191,R196-
	R198,R200,R202
57	R8,R34,R203	3	S25000-6812SMT	RESISTOR,SMD,METAL FILM,1/10W,68.1K,1%,S0805
58	R10-R11,R52-R53,R90-	8	S25004-1R00SMT	RESISTOR,SMD,1W,1.00OHMS,1%
	R91,R103-R104
59	R12-R15,R26-R29,R42-	16	S25003-1210SMT	RESISTOR,SMD,1W,121OHMS,1%
	R45,R55-R58
60	R18	1	S25000-5622SMT	RESISTOR,SMD,METAL FILM,1/10W,56.2K,1%,S0805
61	R19,R64,R157,R160,R1	6	S25001-47R5SMT	RESISTOR,SMD,47.5OHMS,1/4W,1206,1%,TR
	65,R170
62	R20,R36,R41,R54	4	S25003-15R0SMT	RESISTOR,SMD,1W,15.0OHMS,1%
63	R21	1	S25000-7681SMT	RESISTOR,SMD,METAL FILM,1/10W,7.68K,1%,S0805
64	R22	1	S25000-4752SMT	RESISTOR,SMD,METAL FILM,1/10W,47.5K,1%,S0805
65	R23,R79	2	S25000-2213SMT	RESISTOR,SMD,METAL FILM,1/10W,221K,1%,S0805
66	R24	1	S25001-2210SMT	RESISTOR,SMD,221OHMS,1/4W,1206,1%,TR
67	R25,R75	2	S25006-10R0SMT	RESISTOR,SMD,METAL_FILM,1/2W,10OHMS,1%,S2010
68	R33,R38	2	S25008-1002SMT	RESISTOR,SMD,PREC,MF,1/10W,10.0K,0.5%,S0805
69	R35,R84,R108-	6	S25001-1000SMT	RESISTOR,SMD,100OHMS,1/4W,1206,1%,TR
	R109,R139,R166
70	R37,R85,R106	3	S25000-3322SMT	RESISTOR,SMD,METAL FILM,1/10W,33.2K,1%,S0805
71	R39,R81-	14	S25000-4751SMT	RESISTOR,SMD,METAL FILM,1/10W,4.75K,1%,S0805
	R82,R98,R128,R131,R1
	67,R177,R182,R185,R1
	87-R188,R210-R211
72	R40,R46-R47,R73-	14	S25001-4751SMT	RESISTOR,SMD,4.75K,1/4W,1206,1%,TR
	R74,R76-R77,R86,R96-
	R97,R141-R142,R179-
	R180
73	R48,R199,R209,R213-	5	S25000-2210SMT	RESISTOR,SMD,METAL FILM,1/10W,221OHMS,1%,S0805
	R214
74	R59,R136	2	S25000-4750SMT	RESISTOR,SMD,METAL FILM,1/10W,475OHMS,1%,S0805
75	R62	1	S25000-1000SMT	RESISTOR,SMD,METAL FILM,1/10W,100OHMS,1%,S0805
76	R63,R120	2	S25000-8251SMT	RESISTOR,SMD,METAL FILM,1/10W,8.25K,1%,S0805
77	R65-R66,R94-	6	S25008-4751SMT	RESISTOR,SMD,PREC,MF,1/10W,4.75K,0.5%,S0805
	R95,R130,R137
78	R67	1	S25000-1003SMT	RESISTOR,SMD,METAL FILM,1/10W,100K,1%,S0805
79	R70,R117,R119,R121,R	5	S25000-3321SMT	RESISTOR,SMD,METAL FILM,1/10W,3.32K,1%,S0805
	204
80	R71	1	S25000-1004SMT	RESISTOR,SMD,METAL FILM,1/10W,1.00M,1%,S0805
81	R78	1	S25001-1002SMT	RESISTOR,SMD,10K,1/4W,1206,1%,TR
82	R80,R83	2	S25000-1212SMT	RESISTOR,SMD,METAL FILM,1/10W,12.1K,1%,S0805
83	R87-R89,R99-	10	S25000-47R5SMT	RESISTOR,SMD,METAL FILM,1/10W,47.5OHMS,1%,S0805
	R102,R205-R207
84	R93	1	S25000-2671SMT	RESISTOR,SMD,METAL FILM,1/10W,2.67K,1%,S0805
85	R105,R110	2	S25003-47R5SMT	RESISTOR,SMD,1W,47.5OHMS,1%
86	R114,R216	2	S25000-6811SMT	RESISTOR,SMD,METAL FILM,1/10W,6.81K,1%,S0805
87	R115	1	S25000-2212SMT	RESISTOR,SMD,METAL FILM,1/10W,22.1K,1%,S0805
88	R116,R153-R154	3	S25003-2002SMT	RESISTOR,SMD,1W,20.0K,1%
89	R118	1	S25001-4752SMT	RESISTOR,SMD,47.5K,1/4W,1206,1%,TR
90	R123,R133	2	S25000-2211SMT	RESISTOR,SMD,METAL FILM,1/10W,2.21K,1%,S0805
91	R124-	6	S25003-2000SMT	RESISTOR,SMD,1W,200OHMS,1%
	R125,R127,R171,R181,
	R189
92	R126,R138	2	S25001-1213SMT	RESISTOR,SMD,121K,1/4W,1206,1%,TR
93	R129	1	S25000-2001SMT	RESISTOR,SMD,METAL FILM,1/10W,2.00K,1%,S0805
94	R134	1	S25000-6813SMT	RESISTOR,SMD,METAL FILM,1/10W,681K,1%,S0805
95	R140	1	S25000-3323SMT	RESISTOR,SMD,METAL FILM,1/10W,332K,1%,S0805
96	R144,R146,R148,R150,	8	S25001-2670SMT	RESISTOR,SMD,267OHMS,1/4W,1206,1%,TR
	R186,R190,R192-R193
97	R151-R152,R155-	12	S25001-1821SMT	RESISTOR,SMD,1.82K,1/4W,1206,1%,TR
	R156,R158-R159,R163-
	R164,R168-R169,R175-
	R176
98	R161	1	S25001-7500SMT	RESISTOR,SMD,750OHMS,1/4W,1206,1%,TR
99	R172-R174,R178	4	S25001-1211SMT	RESISTOR,SMD,1.21K,1/4W,1206,1%,TR
100	R183	1	S25000-1502SMT	RESISTOR,SMD,METAL FILM,1/10W,15.0K,1%,S0805
101	R201	1	S25001-2211SMT	RESISTOR,SMD,2.21K,1/4W,1206,1%,TR
102	S1	1	T13381-16	SWITCH,PUSHBUTTON,SPST,GREEN,W/BLACK EXTENDER
103	TP1-TP7	7	TESTPT_FUNTIONAL FUNCTIONAL TEST POINT
104	TRI1,TRI3	2	S18395-27	TRIAC,T220,8A,800V,WITH S18104-3HS
105	TRI2,TRI4	2	S15161-27	TRIAC,T220,8A,800V
106	T1-T2	2	T12737-2	TRANSFORMER,PULSE,3-WINDING,1:1:1
107	X1	1	S25073-3SMT	IC,SMD,CMOS,PSOC,8-BIT,CY8C26643,TQFP44(SS)
108	X2	1	S15128-27SMT	IC,OP-AMP,SINGLE,PRECISION,LT1097S8
109	X3-X4,X14	3	S15128-28SMT	IC,OP-AMP,SMT,QUAD,HIGH-PERF,33074ADT
110	X5	1	S18395-8	REGULATOR,HEAT-SINKASBLY,S15128-6,S18104-3
111	X6	1	S15128-10SMT	IC,SMD,VOLTAGE REF,ADJ, PRECISION,431I,SOIC-8
112	X7	1	M15102-4SMT	IC,ARRAY,DRIVER,PERIPHERAL,NPN,DARLINGTON
113	X8	1	S15128-5SMT	IC,VOLT REG,SMD,FIXED,3-T,(+),1A,5V
114	X9	1	S25072-2SMT	IC,SMD,ACT,BUFFER,OCTAL,3-STATE,TSSOP-20(SS)
115	X10	1	S15018-21SMT	IC,SMD,CMOS,DRIVER,MOSFET,4451, SOIC-8(SS)
116	X11	1	S17900-24SMT	IC,SMD,CMOS,GATE,NAND,2-INPUT,QUAD,SCHM(SS)
117	X12	1	S25065-3SMT	IC,SMD,CMOS,INVERTER,SCHMITT,HEX,VHC14(SS)
118	X13	1	S15018-11SMT	IC,SMD,CMOS,SWITCH,ANALOG,QUAD,201(SS)

BUY AS:

G 4 5 5 1 - 1 B 4

PART NUMBER IDENTIFICATION CODE

							BUY PER E3867
ENCAPSULATE WITH HUMISEAL (2 COATS)							TEST PER E4127-C
1A27LU PER E1844 OR WITH EQUIVALENT AS						P.C. BOARD BLANK REFERENCE INFORMATION
APPROVED BY LINCOLN ELECTRIC CO.							BUY COMPLETE AS G4551-B
						SEE ELECTRONIC FILE FOR INFORMATION
						SCHEMATIC REFERENCE G4550-1B4
		THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OWNED BY LINCOLN GLOBAL, INC. AND MAY NOT BE DUPLICATED, COMMUNICATED
PROPRIETARY & CONFIDENTIAL:
		TO OTHER PARTIES OR USED FOR ANY PURPOSE WITHOUT THE EXPRESS WRITTEN PERMISSION OF LINCOLN GLOBAL, INC.
UNLESS OTHERWISE SPECIFIED TOLERANCE	DESIGN INFORMATION		REFERENCE:	EQUIPMENT TYPE:			PRECISION TIG 185	PAGE 1	OF 1
MANUFACTURING TOLERANCE PER E2056
ON 2 PLACE DECIMALS IS ± .02	DRAWN BY:	jbarto	G4407-1
ON 3 PLACE DECIMALS IS ± .002				SUBJECT:		CONTROL PC BOARD ASSEMBLY		DOCUMENT	DOCUMENT
ON ALL ANGLES IS ± .5 OF A DEGREE	ENGINEER: Trang Nguyen		SCALE:					NUMBER:	REVISION:
MATERIAL TOLERANCE ("t ") TO AGREE								G4551-1	D
WITH PUBLISHED STANDARDS.				MATERIAL		APPROVAL	PROJECT
DO NOT SCALE THIS DRAWING	APPROVED:	-	1:1.25 DISPOSITION:		UF	DATE:	11/29/2005 NUMBER: CRM37680

SOLID EDGE

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 pro- vided 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.