We are experiencing more and more TAG Heuer timers coming back for service with Channel 1 disabled. Or more likely the Channel 1 black ground socket
The only circumstance we can determine is that an electrical spike or surge was carried by the hill wiring start pair into the timer.
Fortunately A TAG Heuer CP 545 or HL 440 can be Synced with any Channel.
The Ground ( black) sockets can be jumped as well. So use the Channel 1 Green signal input with another Black ground if you have to in order to use Channel 1 as your start in Net time mode.
So please unplug the timer from hill wiring when not using it.
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