Lincoln Electric IDEALARC DC-655 Service Manual page 58

F-16
9. Check continuity (zero ohms) from lead #41
(plug P15 pin-10) to plug J5-pin 1 at the fir-
ing board.
Diagram and Figure F.1. If a resistance of
any value is indicated, check the associat-
ed wires, plugs and thermostats.
P16
14-PIN
RECEPTACLE
C 2 5
D 4 6
TROUBLESHOOTING & REPAIR
See the Simplified Trigger
FIGURE F.3 – SIMPLIFIED TRIGGER DIAGRAM
10AMP
CIRCUIT
BREAKER
TO #42 AT MAIN
TRANSFORMER
42A
TERMINAL
P15
STRIP
13
2 5 # 2
4 9 #4
11 #41
41
10
TO #41 AT MAIN
TRANSFORMER
IDEALARC DC-655
OUTPUT
TERMINAL
SWITCH
#4
9J5
#273 #41
1J5
N.C.
N.C.
CHOKE LEAD
SECONDARY
THERMOSTAT
THERMOSTAT
F-16
FIRING BOARD
11J5 #309
TO
CONTROL
BOARD
LED10
10J5 #310
LATCHING
RESISTOR
ENABLE
FIRING
CIRCUIT
ENABLE