GE JK3800DH1BB Technical Service Manual page 14

Machine Control: A separate control board that contains all relays and communicates with the User
Interface to control all outputs. The Machine Control is located behind the control panel housing.
User Interface: A LOGIC board that interprets customer input from the keypanel.
Bridge Board: An interface board that communicates between the User Interface, Machine Control and
Microwave Controls.
Glass Touch: A capacitive glass panel that transfers key pad touches to the User Interface board. It is
connected by a harness to the Machine Control. The User Interface plugs directly into the Glass Touch
assembly.
Thermal Limit Switch: These temperature operated switches provide a safety back-up in case of a
thermal "run-away". All are "one-shot" and will need replacement if they open. Check for the cause of over
temperature!
FAD - Fan Apparency Device: In previous models, these were temperature operated devices that would
open a circuit if the area got over temperature. Current production models use FAD boards that monitor
cooling fan speeds; the control will shut down operation if fan speed is not within valid range. The boards will
also log a F96, F97, F98 or F99 code. This operates like a miniature tachometer.
SWO: Single Wall Oven
DWO: Double Wall Oven
DLB: A relay to isolate elements from L2, must close for all heating cycles.
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