Samsung CM1929, Service Manual, Page: 39 / 43

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10. Wiring Diagram and Operating Sequence
10-2 Description of Operating Sequence(Continued)
High Voltage Transformer input power sensing circuitry
Refers to the circuitry that detects and check if the input power is correctly supplied to the primary
terminal of High Voltage Transformer when the microwave oven is operating. If any abnormal
condition(eg. Micro S/W, Relay open) is detected, the error code (E41, E42) shows on the display
window. When the error code appears in the display window, check the wave form(A), (B), (C),or (D).
In case of Power Relay 1 (RY2), check the wave form (A), (B) below.
In case of Power Relay 2 (RY5), check the wave form (C), (D) below.