Rap 2.19 Shutdown Relay - Challenge CMT-130TC Service Manual

RAP 2.19 Shutdown Relay

Output 14
The shutdown relay provides trimmer shutdown
information to 3rd-party products. When the
pump motor shuts down, the relay switches off.
The shutdown relay is located on the main PWB
(Figure 2-23).
Possible Fault Indicators

3rd-party product gets a signal that the
trimmer is shut down when it is operat-
ing.

3rd-party product get a signal that the
trimmer is operating when it is shut
down.
Procedure
1. Switch the main power ON. Is the output
LED 14 (GP 6.3 Input/Output LEDs)
switched off?
Y N
Disconnect power and replace the main
PCB (REP 4.23 Main PWB Replacement).
2. Test continuity between the N.C. contact
and Common contact (Figure 2-23). Does
the resistance measure less than 2 Ω?
Y N
Disconnect power and replace the relay (PL
5.16 Power Panel EE-3503 (1/2)).
3. Press the green start button. Does output
LED 14 switch on?
Y N
Disconnect power and replace the main
PCB (REP 4.23 Main PWB Replacement).
4. Is there 24 VDC between wires 39 and 73 at
the relay?
CMT-130TC Book Trimmer
Y N
Repair loose or damaged wires 39 or 73 be-
tween the main PCB and shutdown relay.
5. Test continuity between the N.O. contact
and Common contact (Figure 2-23). Does
the resistance measure less than 2 Ω?
Y N
Disconnect power and replace the relay (PL
5.16 Power Panel EE-3503 (1/2)).
6. Check the 3rd-party product and its hook-up
for the fault.
MAY 2019
2-27
Figure 2-23. Shutdown Relay
2. Status Indicator RAPs