1 FEATURE CHART
4
2 CONTROL PANEL
4
2.1.
NN-ST340M, ST340W
4
2.2.
NN-SM330M, SM330W, SM320M
5
3 SCHEMATIC DIAGRAM
6
3.1.
NN-ST340M, ST340W
6
3.2.
NN-SM330M, SM330W, SM320M
7
4 DESCRIPTION OF OPERATING SEQUENCE
8
4.1.
Variable power cooking control (NN-SM330M, SM330W,
SM320M)
8
4.2.
Variable power cooking control (NN-ST340M, ST340W) 8
4.3.
Turbo Defrost, Auto Reheat, Auto Cook control (NN-
ST340M, ST340W)
8
5 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING 9
5.1.
Check the grounding
9
5.2.
Warning about the electric charge in the high voltage
capacitor
9
5.3.
Part replacement.
9
5.4.
When the 10 Amp fuse is blown due to the malfunction of
the short switch:
9
5.5.
Avoid inserting nails, wire, etc. through any holes in the
unit during operation.
9
5.6.
Verification after repair
9
6 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 10
6.1.
Magnetron
10
6.2.
Digital programmer circuit (D.P.C) & Membrane switch
(NN-ST340M/W)
10
6.3.
Low voltage transformer and/or power relays (RY1) (NN-
ST340M/W)
11
6.4.
Fan motor
12
6.5.
Door assembly
12
6.6.
Turntable motor
14
7 COMPONENT TEST PROCEDURE
15
7.1.
Primary, Secondary Latch Switch Interlocks
15
7.2.
Short Switch & Monitor
15
7.3.
High voltage transformer
15
7.4.
High voltage capacitor
15
7.5. Magnetron
15
7.6.
Diode
16
7.7.
Variable power controller (NN-SM330M, SM330W,
SM320M)
16
7.8.
Membrane keyboard (Membrane switch assembly) (NN-
ST340M, ST340W)
16
8 MEASUREMENTS AND ADJUSTMENTS
17
8.1.
Adjustment of Primary latch switch, Secondary latch
switch and Short switch.
17
8.2.
Measurement of microwave output
17
9 TROUBLESHOOTING GUIDE
18
9.1.
NN-ST340M, ST340W
18
9.2.
NN-SM330M, SM330W, SM320M
20
9.3.
Trouble related to Digital Programmer Circuit (NN-
ST340M, ST340W)
21
9.4.
How to check the semiconductors using an OHM meter
21
10 EXPLODED VIEW AND PARTS LIST
22
10.1. EXPLODED VIEW
22
10.2. PARTS LIST
23
10.3. ESCUTCHEON BASE ASSEMBLY
25
10.4. DOOR ASSEMBLY
27
10.5. WIRING MATERIALS
28
10.6. PACKING AND ACCESSORIES
29
11 DIGITAL PROGRAMMER CIRCUIT
30
11.1. SCHEMATIC DIAGRAM (NN-ST340M, ST340W)
30
11.2. PARTS LIST (NN-ST340M, NN-ST340W)
32
CONTENTS
Page
Page
3
NN-ST340M / NN-ST340W / NN-SM330M / NN-SM330W / NN-SM320M
Summary of Contents for NN-SM330M
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 ...
