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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