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G-4
ELECTRICAL DIAGRAMS
SQUARE WAVE TIG 255
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X19 IC-UNDERVOLTAGE-SENSING,RESET,
MCU
X10 IC-CMOS,INVERTER,SCHMITT,
HEX,HC14A
C65,C66 CAPACITOR-TAEL,4.7,35V,10%
X11,X14 IC-OP-AMP,QUAD,HIGH-PERF,33074A
C49,C67,C68 CAPACITOR-CD,.0047,3000V,20%
DZ13,DZ14,DZ15, ZENER DIODE-1W,12V,5%,1N4742A
DZ16,DZ17
J2 CONNECTOR,PCB,WW,MALE,DIL,1X9
X15 REGULATOR & HEATSINK ASBLY
D10,D11,D21,D22 DIODE-AXLDS,1A,1000V
C79,C80 CAPACITOR-CD,750P,1000V,10%
R33 RESISTOR-MF,1/4W,301,1%
Y1 CRYSTAL-QUARTZ,8.000MHZ
OCI8,OCI9,OCI10 OPTOCOUPLER-TRIAC DRIVER,ZVC,
3083
X20,X21,X22 IC-CMOS,LATCH,3-STATE,OCTAL,
HC573A
TRI1,TRI2,TRI3 TRIAC-T220,6A,800V
R237 TRIMMER-MT,1/2W,10K,10%,LINEAR
X31,X32 IC-ARRAY,CLAMPING,PERIPHERAL
R164,R235 RESISTOR-WW,5W,150,5%,SQ
R7 RESISTOR-MF,1/4W,133K,1%
R230,R231,R232, RESISTOR-MF,1/4W,26.7K,1%
R233,R234
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) (cont’d)
Item Identification