Panasonic NN-S784BF, Service Manual

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6. Steam Sensor and Digital Programmer Circuit
In order to determine if the steam sensor function of the digital
programmer circuit is in working order or not, do the following
test.
1) Place a water load (150 cc) in the oven.
2) Tap Sensor Reheat pad.
3) Tap Start Pad.
4) Steam Sensor detects steam about 1.5 to 4 minutes after the
Start Pad is tapped.
5) T1 time cooking automatically switches to remaining time cooking
(T2).
6) The remaining cooking time (T2) appears in display window. If
the following cooking time appears, Steam Sensor function is
normal.
T2 TIME
8 Sec.~23 Sec.
T1 TIME
1 Min. 30 Sec.~4 Min.
(Remaining cooking time)