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F-16

F-16

TROUBLESHOOTING & REPAIR

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.

FIGURE F.3 – SIMPLIFIED TRIGGER DIAGRAM

TOC

TOC

10AMP

CIRCUIT

BREAKER

42A

TERMINAL

TO #42 AT MAIN TRANSFORMER

FIRING BOARD

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14-PIN

RECEPTACLE

C2

D4

P16

5

6

STRIP

2

4

41

 

P15

 

 

 

 

 

 

 

 

 

 

 

13

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

#2

 

 

OUTPUT

 

 

 

 

TERMINAL

 

 

 

 

 

 

 

 

 

SWITCH

 

9

 

 

#4

 

 

 

 

 

 

 

 

 

 

 

#4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11

 

 

#41

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

#273#41

N.C.N.C.

SECONDARYCHOKE LEAD

THERMOSTATTHERMOSTAT

TO #41 AT MAIN

TRANSFORMER

9J5

1J5

LED10

11J5

10J5

LATCHING

RESISTOR

ENABLE

FIRING

CIRCUIT

ENABLE

#309

TO

CONTROL

BOARD

#310

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IDEALARC DC-655

Page 58
Image 58
Lincoln Electric DC-655 service manual Figure F.3 Simplified Trigger Diagram