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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.
ELECTRICAL DIAGRAMS
G-23
V300-I
PC BOARD ASSEMBLY - PROTECTION - (L7915-2)
G-23
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Item Identification
B5, B14, B51, B52, B53 CONNECTOR, tab 1/4”
C1, C3, C4, C5, C6 CAPACITOR, ceramic
C2 CAPACITOR, tantlm etc.
27µf 35VDC
D1, D3, D4, D5, D6, D7 DIODE, 1A 400V
D8 DIODE, 1A 1000V
DZ1 DIODE, IN4740 Zener 10V 1W
J8 RECEPTACLE, Molex mini 4 pin
J15 RECEPTACLE, Molex mini 6 pin
OCI1, OCI2, OCI3, OCI4 OPTO, Isolator CNY17-3
P8 (plugs into J8) PLUG HOUSING, Molex mini 4 pin
P15 (plugs into J15) PLUG HOUSING, Molex mini 6 pin
R1, R2 RESISTOR, MF .25W 1% 681K
ohm
R3, R13, R16 RESISTOR, MF .25W 1% 1.82K
ohm.
R4, R5, R11, R12 RESISTOR, MF .25W 1% 150K
ohm
R6, R8, R9, R10, R27 RESISTOR, MF .25W 1% 56.2K
ohm
R7, R20 POTENTIOMETER, Cermet trmr
.25W 1% 5K ohm
R14 RESISTOR, MF .25W 1% 100K
ohm
R15 RESISTOR, MF .25W 1% 475
ohm
R18, R26, R28, R32 RESISTOR, MF .25W 1% 10K
ohm
R19 RESISTOR, MF .25W 1% 3.32K
ohm
R21, R23, R24, R25, RESISTOR, MF.25W 1% 15K
R29, R30, R31, R33 ohm
R22 RESISTOR, MF .25W 1% 332K
ohm
R34, R36 RESISTOR, MF .25W 1% 276K
ohm
R35, R37 RESISTOR, MF .25W 1% 332
ohm
TERMINALS (P8, P15) TERMINALS, Molex mini
X1 QUAD OP-AMP
X2 VOLTAGE REGULATOR, linear
7805 5VDC
NOTE: Individual parts listed are not available from Lincoln Electric.