Lincoln Electric LN-25, Service Manual

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DIAGRAMS G-10 G-10
LN-25
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 provided for reference only
. Lincoln Electric dis-
courages 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 PC BOARD LAYOUT CODES 9812 AND BELOW
Item Identification Item Identification
D6 HEAT SINK ASBL Y
X4 IC-CONVERTER,F/V,2907
C4,C23 CAPACITOR-ALEL,50,25V,+75/-10%
OCI1 OPTOCOUPLER-PHOTO-Q,30V,4N35
X3 IC-CMOS,INVERTER,SCHMITT,HEX,4584
R22 TRIMMER-MT,1/2W,100K,10%,LINEAR
R11 TRIMMER-MT,1/2W,500,10%,LINEAR
C15 CAPACITOR-CEMO,.022,50V,20%
Q1 HEAT SINK ASBL Y
Q9 TRANSISTOR & HEAT SINK ASBL Y
Q8 TRANSISTOR & HEAT SINK ASBL Y
D2,D3,D5,D7,D8,
D9,D10,D11,D13,
D14,D16,D17,D18,
D19,D20,D21,D22,
D23,D24,D25,D28,
D29,D32
DIODE-AXLDS,1A,400V
D1,D4,D27 DIODE-AXLDS,1A,600V
J4 CONNECTOR-MOLEX,
R2,R72,R86 RESISTOR-WW,5W,3.3K,5%,SQ
C22 CAPACITOR-ALEL,10,25V,+75/-10%
C7,C30,C31 CAPACITOR-TAEL,1.8,20V,10%
C27,C45 CAPACITOR-TAEL,4.7,35V,10%
C14,C18,C19,C25 CAPACITOR-TAEL,18,15V,10%
C29,C32 CAPACITOR-TAEL,1.0,35V,10%
C16 CAPACITOR-PCF,.0033,200V,10%
C10 CAPACITOR-ALEL,20,50V,+75/-10%
C21,C24,C44 CAPACITOR-PEF,.001,400V,10%
C11 CAPACITOR-PEF,.0022,400V,10%
C5 CAPACITOR-ALEL,3300,50V,+30/-10%
C17 CAPACITOR-TAEL,0.33,50V,10%
X1,X2 IC-VOLT REF,ADJ,PRECISION,431I
C3,C6,C12,C20,
C28,C33,C34,C35,
C36,C37,C38,C39,
C40,C41,C42,C43,
C47
CAPACITOR-CD,.02/.022,25V,20%
C1 CAPACITOR-CD,.05,600V,+80/-20%
C13,C46,C48,C49 CAPACITOR-CD,100P,1000V,10%
C26 CAPACITOR-PEF,0.1,400V,10%
R47 RESISTOR-WW,7W,0.100,1%
DZ2,DZ3,DZ4 ZENER DIODE-1W,16V,5%,1N4745A
DZ1 ZENER DIODE-1W,12V,5%,1N4742A
Q7,Q11 TRANSISTOR-P,T226,0.2A,30V,2N4125
D12 DIODE-AXLDS,3A,600V,1N5406
R1 RESISTOR-CC,2W,10,10%
B539,B541 CONNECTOR,TAB,QC,VER TICAL,1/4
B500,B512,B555 CONNECTOR,TAB,QC,VER TICAL,3/16
J3
PC BD PLUG ASBL Y
TP1 MOV-150VRMS,45J,14MM,CRIMPED
R13,R14 RESISTOR-WW,5W,4.7K,5%,SQ
R38 RESISTOR-WW,5W,68,5%,SQ
C2,C8,C9 CAPACITOR-ALEL,470,350V,+30/-20%
J1 PC BD PLUG ASBL Y
J2 PC BD RECEPTACLE ASBL Y
R3,R5,R17,R37,R73 RESISTOR-MF,1/4W,100,1%
R9,R81,R83 RESISTOR-MF,1/4W,1.00K,1%
R18,R19,R24,
R26,R60,R63,R76* RESISTOR-MF,1/4W,10.0K,1%
R16,R61 RESISTOR-MF,1/4W,100K,1%
R27 RESISTOR-MF,1/4W,1.00M,%
R54 RESISTOR-MF,1/4W,102K,1%
R4 RESISTOR-MF,1/4W,10.0,1%
R91 RESISTOR-MF,1/4W,1.30K,1%
R10,R52,R64 RESISTOR-MF,1/4W,13.7K,1%
R45 RESISTOR-MF,1/4W,1.50K,1%
R69,R74,R77 RESISTOR-MF,1/4W,15.0K,1%
R33,R62,R66 RESISTOR-MF,1/4W,150K,1%
R51 RESISTOR-MF,1/4W,16.5K,1%
R6,R31 RESISTOR-MF,1/4W,18.2K,1%
R15,R20,R21,R29,
R30,R34,R39,R40,
R49,R67,R68,R71,
R79,R80,R82,R89,R90 RESISTOR-MF,1/4W,22.1K,1%
R42,R88 RESISTOR-MF,1/4W,2.43K,1%
R57 RESISTOR-MF,1/4W,267,1%
R8 RESISTOR-MF,1/4W,2.67K,1%
R35,R56,R59,R70,R75 RESISTOR-MF,1/4W,26.7K,1%
R55 RESISTOR-MF,1/4W,2.80K,1%
R25,R32 RESISTOR-MF,1/4W,3.32K,1%
R78 RESISTOR-MF,1/4W,33.2K,1%
R43 RESISTOR-MF,1/4W,3.92K,1%
R41 RESISTOR-MF,1/4W,39.2K,1%
R50,R53,R65 RESISTOR-MF,1/4W,44.2K,1%
R7,R12,R84,R85,R94 RESISTOR-MF,1/4W,4.75K,1%
R46 RESISTOR-MF,1/4W,47.5K,1%
R28,R36,R58 RESISTOR-MF,1/4W,5.62K,1%
R44,R95 RESISTOR-MF,1/4W,6.81K,1%
R23 RESISTOR-MF,1/4W,68.1K,1%
X11 IC-CMOS,SWITCH,ANALOG,QUAD,4066
X5,X6 IC-OP-AMP,QUAD,GEN-PURPOSE,224N
D31 DIODE AND HEAT SINK ASBL Y
Q15 SBS-T226,7.5-9.0V,MBS4993
X10 IC-CMOS FLIP-FLOP,ÓDÓ,DUAL
X7,X8,X9 IC-COMPARATOR,QUAD,2901N
Q3,Q4,Q5,Q6,
Q10,Q12,Q13
Q14*
TRANSISTOR-N,T226,0.2A,30V,2N4123
Q2 TRANSISTOR-N,T226,0.3A,400V,MPS-A44
R87 RESISTOR-MF,1/4W,7.68K,1%
NOTE: Individual parts listed are not available from
Lincoln Electric.