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NuTone Vintage Door Chime Picture Gallery > NuTone LB42 Westminster 8 Note Chime > NuTone LB42 chime base dirty traces with arrows

Under the clock motor is the circuit board which has the circuit traces, where the wiper arm contacts make and break the connections for the ring sequence.

These traces become dirty and covered with carbon after years of use.  This can cause the chime to ring intermittently or stop ringing mid sequence.