Panasonic NN-G335MF Service Manual page 41

1. Select any power other than "High" and start the oven.
2. Check continuity between both terminals of the variable power
switch.
3. Variable power controller (timer and variable power switch) is
working proporty it the ohm meter reads open and 0 within 30 ±
2 seconds interval as shown in table on P.9.
8.7. Diode (U)
1. Isolate the diode (U) from the circuit by disconnecting the leads.
2. With the ohmmeter set on the highest resistance scale, measure
the resistance across the diode terminals.Reverse the meter leads
and again observe the resistance reading.Meter with 6V, 9V or
higher voltage batteries should be used to check the front-to-back
resistance of the diode, otherwise an infinite resistance may be
read in both directions. / A normal diode's resistance will be
infinite in one direction and several hundred K in the other
direction.
3. With the ohmmeter set on the highest resistance scale, measure
the resistance across the protector diode terminals. Reverse the
meter leads and again observe the resistance reading.
A normal protector diode's resistance will be infinite in both
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