GE Monogram ZET1F Technical Service Manual page 12

Machine Control: A separate control board that contains all relays and communicates with 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 key panel and encoders.
Glass Touch: A capacitive glass panel that transfers key pad touches to the user interface board. On
Machine Control units, 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 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 the fan speed is not within a valid range. The boards will
also log a F96, F97, F98 or F99 fault code. 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.
Encoder Board: A rotary switch assembly that communicates the switch setting to the main control board.
Unlike a typical rotary switch, very little current is used on its contacts. The back lit knob LED's are part of
these boards. (Monogram only)
Turnbuckle: A turnbuckle is a device for adjusting the tension or length of tie rods, and other tensioning
systems. It consists of two threaded bolts, one screwed into each end of a small metal frame, one with a
left-hand thread and the other with a right-hand thread. The tension can be adjusted by rotating the frame,
which causes both bolts to be screwed in or out simultaneously, without twisting the bolts.
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