7.6. Diode
1. Isolate the diode 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
Ω
in the other direction.
7.7. Variable power controller (NN-
SM330M, SM330W, SM320M)
•
Isolate variable power switch from the circuit by
disconnected 2 leads.
•
In order to check if variable power controllor is operating
normally, follow the test procedures below.
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
Ω
within 30 ± 1 seconds interval as shown in table
on P.8.
7.8. Membrane keyboard
(Membrane switch assembly)
(NN-ST340M, ST340W)
Check continuity between switch terminals, by tapping an
appropriate pad on the key board. The contacts assignment of
the respective pads on the key board is as shown in digital
programmer circuit.
16
NN-ST340M / NN-ST340W / NN-SM330M / NN-SM330W / NN-SM320M
Summary of Contents for NN-ST340M
Page 2: ...2 NN ST340M NN ST340W NN SM330M NN SM330W NN SM320M...
Page 5: ...2 2 NN SM330M SM330W SM320M 5 NN ST340M NN ST340W NN SM330M NN SM330W NN SM320M...
Page 6: ...3 SCHEMATIC DIAGRAM 3 1 NN ST340M ST340W 6 NN ST340M NN ST340W NN SM330M NN SM330W NN SM320M...
Page 7: ...3 2 NN SM330M SM330W SM320M 7 NN ST340M NN ST340W NN SM330M NN SM330W NN SM320M...
Page 19: ...19 NN ST340M NN ST340W NN SM330M NN SM330W NN SM320M...
Page 31: ...31 NN ST340M NN ST340W NN SM330M NN SM330W NN SM320M...
