Lincoln Electric IDEALARC R3R-300 Service Manual page 68

F-34
POCKET AMPTROL CIRCUIT TEST (continued)
FIGURE F.24 – POCKET AMPTROL SIMPLIFIED DRAWING
POCKET AMPTROL
TRANSFORMER (T3)
#201A GREEN
1J7
YELLOW
2J7
GREEN
3J7
#203A
#77
MACHINE
REMOTE
#76
SWITCH
TROUBLESHOOTING & REPAIR
FIGURE F.23 – SENSING RESISTOR R4
#219
#218
2 J6
1J 6
POCKET
CONTROL
AMPTROL
P.C.
P.C.
BOARD BOARD
4J6 3J6
5J6 5J1
#75
IDEALARC R3R
R4
SENSING
RESISTOR
POCKET
AMPTROL
0.4
R4
OHMS
SENSING
ASSEMBLY
SHUNT
SCR/DIODE
RECTIFIER
BRIDGE
CHOKE
F-34
POSITIVE
OUTPUT
TERMINAL
NEGATIVE
OUTPUT
TERMINAL