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TABLE OF CONTENTS
- THEORY OF OPERATION SECTION -
LN-23P
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section E
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2
Input Power Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2
Control Circuit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-3
Volts and Speed Control Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . E-3
Trigger and Interlock Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-3
Optional Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-4
Section ESection E
Return to Master TOC Return to Master TOC Return to Master TOC Return to Master TOC
FIGURE E.1 GENERAL DIAGRAM
+
VOLTMETER
WIRE SPEED CONTROL
REDUCED SPEED CONTROL
GUN TRIGGER SWITCH
REED SWITCH ACTIVATED
GUN CONDUCTOR BLOCK
WIRE FEED MOTOR
BY WELDING CURRENT
VOLTAGE CONTROL
LN-23P
CONTROL
P.C. BOARD
3.5 A CIRCUIT
BREAKER
567
R12
R75
535
535
A
B
C
D
539
647
647
WORK
604
602
604
604
21
77
75
76
521
602
604
WORK (+)
ELECTRODE (-)
6 PIN CONNECTOR
8 PIN CONNECTOR
602
TP2
R76
1
1 23456
42536
541
641
BLACK
WHITE
642
67
521
567A
567
601
75
76
77
642
521
644
10KΩ, 4 W
82V, 12J
100Ω, 1 W
10KΩ, 4 W
A
B
C
GECDHF
DCBAF E