See the simplified, Trigger diagram, Simplified trigger diagram – Lincoln Electric IDEALARC DC-655 User Manual

Page 58: D. see the simplified trigger diagram, Troubleshooting & repair, F-16, Figure f.3 – simplified trigger diagram

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9.

Check continuity (zero ohms) from lead #41
(plug P15 pin-10) to plug J5-pin 1 at the fir-
ing board. See the Simplified Trigger
Diagram and Figure F.1. If a resistance of
any value is indicated, check the associat-
ed wires, plugs and thermostats.

TROUBLESHOOTING & REPAIR

F-16

F-16

IDEALARC DC-655

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2

4

C

D

P16

2

4

TERMINAL

STRIP

42A

13

P15

5

9

41

11
10

2

#

#4

TO #41 AT MAIN
TRANSFORMER

TO #42 AT MAIN

TRANSFORMER

#273

N.C.

SECONDARY

THERMOSTAT

#41

N.C.

CHOKE LEAD

THERMOSTAT

#4

#41

9J5

1J5

11J5

10J5

#309

#310

TO

CONTROL

BOARD

OUTPUT

TERMINAL

SWITCH

14-PIN

RECEPTACLE

10AMP

CIRCUIT

BREAKER

FIRING BOARD

LATCHING
RESISTOR
ENABLE

FIRING
CIRCUIT
ENABLE

5

6

LED10

FIGURE F.3 – SIMPLIFIED TRIGGER DIAGRAM