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G-3
ELECTRICAL DIAGRAMS
SQUARE WAVE TIG 255
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NOTE: Lincoln Electric assumes no responsibility for liabilities resulting from board level troubleshooting. PC Board
repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not avail-
able 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.
CONTROL BOARD (G2150)
Item Identification
Item Identification
X12 IC-VOLT REG,FIXED,3-T,(+),1A,5V
C22,C32 CAPACITOR-CEMO,22P,100V,5%
C51,C52,C53,C54, CAPACITOR-CEMO,100P,100V,5%
C55,C56,C57,C58,
C59,C60,C82,C83,
C84,C85,C86
C5,C20,C25,C34,C41, CAPACITOR-CEMO,.022,50V,20%
C73,C74,C76,C77
C19,C21 CAPACITOR-CEMO,150P,100V,5%
J7 CONNECTOR,MOLEX,MINI,PCB,4-PIN
J4 CONNECTOR,MOLEX,MINI,PCB,6-PIN
J1 CONNECTOR,MOLEX,MINI,PCB,8-PIN
PTC1,PTC2 THERMISTOR-PTC,56 OHMS,90MA
D1,D2,D3,D4,D5,D6,D7, DIODE-AXLDS,1A,400V
D18,D19,D20,D23,D24,
D25,D30,D34,D37,D38,
D39,D40,D41,D43,D44,
D45,D46,D47,D48,D49,
D50,D51,D52,D53,D54,
D55,D56,D57,D58,D59,
D71,D72,D73,D74,D75,
D76,D77,D78,D79,D80,
D81,D92,D99,D100,D101
L1 CHOKE-330UH,10%,110MA,MOLDED
L2,L3 CHOKE-390UH,5%,225MA,CONFORMAL
C16,C35 CAPACITOR-TAEL,18,15V,10%
C23,C44,C47,C48,C71 CAPACITOR-TAEL,1.0,35V,10%
C43 CAPACITOR-ALEL,20,50V,+75/-10%
C27,C28,C29,C30 CAPACITOR-TAEL,27,35V,10%
OCI1,OCI2,OCI3, OPTOCOUPLER-PHOTO-Q,70V,
OCI4,OCI5,OCI6* CNY17-3
X16 IC-VOLT REG,FIXED,3-T,(-),1A,15V
C3,C7,C10,C11,C12, CAPACITOR-CEMO,0.1,50V,10%
C14,C15,C33,C38,
C45,C62,C69,C70,
C72,C75,C78,C81
J5 CONNECTOR,MOLEX,MINI,PCB,10-PIN
J8 CONNECTOR,MOLEX,MINI,PCB,12-PIN
J6 CONNECTOR,MOLEX,MINI,PCB,14-PIN
DZ1,DZ6,DZ7,DZ10 ZENER DIODE-1W,30V,5%,1N4751A
DZ4,DZ5,DZ8,DZ9 ZENER DIODE-1W,18V,5%,1N4746A
Q1,Q3,Q5,Q8,Q10, TRANSISTOR-N,T226,0.5A,40V,2N4401
Q11,Q13,Q14,Q16,Q17
Q2,Q4,Q6,Q12 TRANSISTOR-NMF,4PDIP,1A,100V,
RFD110
D42 DIODE-AXLDS,1A,30V,SCHOTTKY
C42 CAPACITOR-ALEL,1000,35V,+30/-20%
R14,R17,R18,R21,R24, RESISTOR-MF,1/4W,100,1%
R26,R109,R154,R155,
R156,R157,R158,R159,
R160,R162,R163,R168,
R169,R170,R171,R182,
R183*
R20,R25,R41,R56,R57, RESISTOR-MF,1/4W,1.00K,1%
R68,R69,R74,R77,R84,
R87,R91,R92,R93,R94,
R112,R113,R114,R115,
R118,R120,R123,R124,
R127,R129,R140,R144,
R214,R225,R226,R227,
R228,R229
R9,R22,R49,R76,R122, RESISTOR-MF,1/4W,10.0K,1%
R125,R128,R172,R187,
R211,R223,R224*
R39,R44,R67,R199, RESISTOR-MF,1/4W,100K,1%
R222,R236
R38,R54,R55,R71 RESISTOR-MF,1/4W,1.00M,%
R51,R52 RESISTOR-MF,1/4W,150,1%
R72,R85 RESISTOR-MF,1/4W,1.50K,1%
R137 RESISTOR-MF,1/4W,15.0K,1%
R50,R101,R134,R212 RESISTOR-MF,1/4W,2.21K,1%
R27,R63,R142 RESISTOR-MF,1/4W,221K,1%
R12,R23,R64,R106, RESISTOR-MF,1/4W,267,1%
R107,R108,R181,R184,
R185
R34 RESISTOR-MF,1/4W,2.67K,1%
R138,R139 RESISTOR-MF,1/4W,26.7,1%
R88,R143,R146,R147, RESISTOR-MF,1/4W,3.32K,1%
R148,R149,R150,R151,
R152,R153,R166,R167
R141 RESISTOR-MF,1/4W,33.2K,1%
R73,R75,R82,R83, RESISTOR-MF,1/4W,475,1%
R102,R103,R104*
R42,R48,R53,R66, RESISTOR-MF,1/4W,4.75K,1%
R79,R81,R97,R130,
R131,R132,R201,R202,
R203,R204,R205,R206,
R207,R208,R209,R210,
R213,R215,R216,R217,
R218
R28,R29,R30,R31, RESISTOR-MF,1/4W,47.5K,1%
R32,R40
R16,R19,R43,R65, RESISTOR-MF,1/4W,475K,1%
R70,R116,R136,R200
CONT’D ON REVERSE PAGE