Panasonic NN-V659WB User manual

ORDER NO. MOP9905005C2
© 1999 Matsushita Electric Industrial Co., Ltd.
All rights reserved. Unauthorized copying and
distribution is a violation of law.
Service Manual
Microwave Oven
NN-V659WB
NN-V659CB
NN-V659FB
NN-V629MB
NN-V689WB
Specifications:
Power Source: 240 V AC Sin
g
le Phase, 50 Hz
Power Requirements: Microwave: 1280W, Grill: 1360W, Maximum: 2580W
Output: (IEC705-88) 900W
Microwave Frequenc
y
: 2,450Mhz
Timer: 99 min. 99 sec.
Oven Cavit
y
Size: 27L
Outside Dimensions: 510mm (W) X 380mm (D) X 304mm (H)
Inside Dimensions: 359mm (W) X 352mm (D) X 217mm (H)
Wei
g
ht: 13 K
g
Inverter Power Suppl
y
Output power: IEC705-88 Test procedure
Specifications subject to chan
g
e without notice

2
DANGER OF HIGH VOLTAGE AND HIGH TEMPERATURE (HOT/LIVE) OF THE INVERTER POWER SUPPLY(U)
WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not con-
tain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by elec-
tricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product dealt with in
this service information by anyone else could result in serious injury or death.
WARNING
* This product should be serviced only by trained, qualified personnel.
This service manual covers products for following markets.
When troubleshooting or replacing parts, please refer to the country identifications shown below for your applicable product specification.
BPQ ... for the United Kingdom
INVERTER WARNING
This Inverter board looks like a regular PCB, however, this PCB drives the magnetron tube with extremely high voltage and high current.
IT HAS: 1: Very high voltage and high current circuit.
It functions the same as the high voltage transformer and high voltage capacitor in ordinary microwave ovens.
2. aluminium heat sink is very hot.
3. Very high voltage may remain in the circuitry even when the oven is off. High voltages may remain in the capacitors on the
board.
DO NOT: *1. Do not touch the circuitry as it becomes very hot (high voltage). Even when replacing board, extreme care should be taken to
avoid possible electric shock. High voltage may remain in the circuit.
*2. Do not touch aluminium heat sink because it is very hot in high voltage and also very hot in high heat energy.
*3. Do not try to repair the Inverter PCB as this can be very dangerous. Replace the whole High Voltage Inverter Circuit(U) unit and
return fully re-packed with the original shopping box and shipping materials.
*4. Do not try to adjust or tamper with the preset volume on the Inverter board because it is very dangerous to adjust it without
proper test equipment.
*5. Do not test oven while Inverter grounding strip or screws are loose. It is very dangerous to operate the H.V. Inverter Circuit (U)
with loose mounting screws or if improperly grounded.
INVERTER POWER SUPPLY DIAGRAM
NEW H.V.
HIGH VOLTAGE AREA*1
DO NOT TOUCH (HOT/HIGH VOLTAGE) *2
HEAT SINK (RECTIFIER BRIDGE)
CHOKE COIL
SAND BAR RESISTOR
CUSTOM I.C.
PHOTO COUPLER
CN 701
CURRENT TRANSFORMER
DO NOT TOUCH *4
HIGH VOLTAGE
PRIMARY WINDINGS
SECONDARY WINDINGS
HIGH VOLTAGE DIODES
CN 703
HIGH VOLTAGE CAPACITORS
DO NOT REPAIR. REPLACE WHOLE H.V.INVERTER(U)
H.V. INVERTER(U) *3
LEAD WIRE
GROUNDING PLATE *5
INVERTER WARNING
INVERTER SUPPORT
BRACKET
LABEL
FILM CAPACITORS
TRANSFORMER

3
TABLE OF CONTENTS
1. CONTROL PANELS................................................................................................................................................. 4
2. OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST PROCEDURE....................................................... 5
3. SCHEMATIC DIAGRAM........................................................................................................................................... 8
4. DESCRIPTION OF OPERATING SEQUENCE........................................................................................................ 9
4.1 Variable power cooking control........................................................................................................................ 9
4.2 Grill cooking ..................................................................................................................................................... 9
4.3 Combination cooking........................................................................................................................................ 9
4.4 Autoweight defrost, autoweight cook ............................................................................................................... 9
4.5 Auto Sensor cook NN-V689WB..................................................................................................................... 10
5. CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING........................................................................... 11
5.1 Check the grounding...................................................................................................................................... 11
5.2 Inverter Warnings .......................................................................................................................................... 11
5.3 When parts must be replaced, remove the power plug from the outlet.......................................................... 12
5.4 When the 10A fuse is blown due to the operation of short switch:................................................................. 12
5.5 Avoid inserting nails, wire, etc. through any holes in the unit during operation.............................................. 12
5.6 Confirm after repair........................................................................................................................................ 12
6. DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE............................................................................ 13
6.1 Magnetron...................................................................................................................................................... 13
6.2 Inverter Power Supply(U) .............................................................................................................................. 13
6.3 Digital Programmer Circuit (DPC) and membrane key board........................................................................ 14
6.4 Low voltage transformer and/or power relays (RY1)...................................................................................... 14
6.5 Fan Motor....................................................................................................................................................... 14
6.6 Door disassembly........................................................................................................................................... 15
6.7 Turntable motor.............................................................................................................................................. 15
6.8 Quartz heater................................................................................................................................................. 15
6.9 Steam Sensor NN-V689WB........................................................................................................................... 16
7. COMPONENT TEST PROCEDURE....................................................................................................................... 17
7.1 Primary Latch Switch, Secondary (Secondary Latch Switch and Power Relay B) Interlocks........................ 17
7.2 Short Switch & Monitor Circuit ...................................................................................................................... 17
7.3 Magnetron...................................................................................................................................................... 17
7.4 Push button key board................................................................................................................................... 17
7.5 Inverter Power Supply (U).............................................................................................................................. 18
7.6 Inverter Power supply (U) ............................................................................................................................. 18
7.7 Steam Sensor and digital programmer circuit................................................................................................ 18
8. MEASUREMENTS AND ADJUSTMENTS............................................................................................................. 19
8.1 Installation of Primary latch switch, Secondary latch switch and Short switch............................................... 19
8.2 Measurement of microwave output................................................................................................................ 19
9. TROUBLESHOOTING GUIDE .............................................................................................................................. 20
10. EXPLODED VIEW AND PARTS LIST ................................................................................................................... 24
11. PARTS LISTS......................................................................................................................................................... 25
12. DOOR ASSEMBLY ................................................................................................................................................ 26
13. ESCUTCHEON BASE ASSEMBLY....................................................................................................................... 27
14. PACKING AND ACCESSORIES............................................................................................................................ 28
15. TRIM KIT PARTS LIST........................................................................................................................................... 29
16. DIGITAL PROGRAMMER CIRCUIT ...................................................................................................................... 30
17. DIGITAL PROGRAMMER CIRCUIT - PARTS LIST.............................................................................................. 32
FEATURE CHART
FEATURES NN-V659 NN-V629 NN-V689
Microwave 6 6
Grill 3 3
Combination 3x3 3 x 3
Weight Defrost 3 3
Weight Combination 10 -
Stage Cooking 3 stage 3 stage
Delay Stand Yes Yes
Clock 12 Hrs 12 Hrs
Word Prompt English English
Weight Reheat 2 -
Weight Cook 2 -
Sensor Reheat - 2
Sensor Cook - 6
Sensor Combination - 6

4
1. CONTROL PANELS
Beep Sound
A beep sounds when a pad is pressed. If this beep does not sound, the setting is incorrect. When the oven changes
from one function to another, two beeps sound. After completion of cooking, five beeps sound
(2)
(6)
(7)
(8)
(9)
(10)
(5)
(1)
(13)
(4a)
(3a)
(11)
(14)
(12a)
(1) Display Window
(2) Time Pads
(3a) Auto Weight Microwave
Programs
(3b) Auto Sensor Microwave
Program
(4a) Auto Weight Combination
Programs
(4b) Auto Sensor Combination
Programs
(5) Auto Weight Defrost
Programs
(6) Microwave Power Setting
(7) Grill Setting
(8) Combination Pad
(9) Delay/Stand Pad:
This can be used to delay a
cooking program for up to 9 hrs
99 mins., or used to time or for
standing (non-cooking) time.
(10) Clock Pad:
Press the clock pad. Using the
minute and second pads set the
clock (12 hr clock). Press clock
pad again to stop colons
flashing.
(11) lb/oz Conversion Pad
(12) Weight Selection Pads
(13) Stop/Cancel Pad:
Before Cooking:
One press clears your
instructions.
During Cooking:
One press temporarily stops the
cooking program. Another press
cancels all your instructions and
the time of day will appear in the
display.
(14) Start Pad:
Press to start operating the
oven. If during cooking the door
(2)
(6)
(7)
(8)
(9)
(10)
(5) (4b)
(1)
(13)
(3b)
(11)
(14)
(12a)
* The design of your control panel may
vary from the panel displayed (depending
on colour), but the words on the pads will
be the same.
NN
-
V689
NN
-
V6
5
9*/NN
-
V629*

5
2. OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST PROCEDURE
Operation guide on the display.
To assist in programming, the next operation will appear on the display. When you are used to operating the oven, you can turn the
operating guide off.
To turn off: To turn on:
Press 3 times Press 3 times
1. SET CLOCK
2. MICROWAVE COOKING - 2 STAGE
3. AUTO WEIGHT DEFROST
OPERATING GUIDE OFF OPERATING GUIDE ON
OPERATION DISPLAY
1. Plug the power supply cord
into the wall outlet
WELCOME TO PANASONIC. REFER
TO OPERATING INSTRUCTIONS
2. Press clock pad
SET TIME
3. Enter time of day
4. Press clock
11:25
OPERATION DISPLAY
1. Place water load in oven
2. Press Micro Power once to
set High Power
HIGH
SET TIME
3. Set time at 5 sec by pressing
1 sec pad 5 times
4. Press Micro Power pad 3
times to set Medium Power
5. Set for 1 minute by pressing
1min pad once
Once
Once
Twice 5 Times
11
PRESS CLOCK
25
5 Times
5 SEC
PRESS START
HIGH
SET TIME
MEDIUM
Once
PRESS START
MIN SEC
100
MEDIUM
6. Press start pad
7. When 1st stage cooking has
elapsed oven automatically
switches to 2nd stage
8. When 2nd stage cooking has
elapsed oven beeps 5 times
and shuts off
OPEN DOOR
OPERATION DISPLAY
1. Select desired program
MEAT ITEMS
SET WEIGHT
2. Press g or lb and oz
LB OZ
MEAT ITEMS
SET WEIGHT
3. Enter the weight by pressing
up and down pads
1LB OZ
PRESS START
4. Press start pad
OPERATION DISPLAY
5
SEC
MIN SEC
100
* *
* *
NN-V689
* *
* *
MIN SEC
908

6
4. DELAY STAND
5. DELAY START
6. GRILL OPERATION
7. COMBINATION COOKING
8. AUTOWEIGHT COOK PROGRAM EXCEPT (NN-V687)
OPERATION DISPLAY
1. Set power level and time
2. Press stand
STAND
SET TIME
3. Set standing time
4. Press start
OPERATION DISPLAY
1. Press delay
DELAY START
SET TIME
2. Set delay time
3. Set power level and time
4. Press start pad
OPERATION DISPLAY
1. Select grill power press once
for grill 1
GRILL 1
SET TIME
2. Set cooking time
GRILL 1
PRESS START
3. Press start
H 1 00
PRESS START
MIN SEC
100
MIN SEC
100
H 1 00
CHOOSE COOKING MODE
1H 00
MIN SEC
100
MIN SEC
100
OPERATION DISPLAY
1. Press combination
COMBINATION
SELECT GRILL LEVEL
2. Press stand
GRILL 1
SELECT MICROPOWER
3. Select micropower low
LOW
SET TIME
4. Set cooking time
PRESS START
5. Press start
OPERATION DISPLAY
1. Select auto weight program
CHILLED MEAL
SET WEIGHT
2. Press to select grams or
pounds and ounces
LB OZ
CHILLED PIZZA
SET WEIGHT
3. Enter the weight
1LB OZ
PRESS START
4. Press start
MIN
SEC
1
00
MIN
SEC
1
00
MIN
SEC
6
25

7
9. AUTO SENSOR COOK (NN-V687WB)
10. TO SET CHILD SAFETY LOCK
11. TO RESET CHILD LOCK
12. DEMONSTRATION MODE
13. CANCEL DEMONSTRATION MODE
OPERATION DISPLAY
1. Select auto sensor program
STEAMED PUDDING
PRESS START
2. Press start
STEAMED PUDDING
OPERATION DISPLAY
1. Press start 3 times to display
lock
* LOCK
OPERATION DISPLAY
1. Press stop/cancel 3 times
Time of day or colon appears
in display
11:25
OPERATION DISPLAY
1. Press clock pad 3 times
DEMONSTRATION MODE
PRESS ANY KEY
OPERATION DISPLAY
1. Press clock pad 3 times
11:25

8
3. SCHEMATIC DIAGRAM
WIRING DIAGRAM
NOTE: *When replacing, check the lead colour as shown.
*Colours shown by ( ) indicate colours of leadwire connector housing.
PRIMARY
LATCH SWITCH
TOP
SECONDARY
LATCH SWITCH
BOTTOM (OUTSIDE) SHORT SWITCH
BOTTOM (INSIDE)
MAGNETRON
HIGH VOLTAGE
INVERTER
POWER RELAY
(RY1) POWER RELAY (RY4)
SYMBOL COLOUR
OR ORANGE
BL BLUE
BR BROWN
WWHITE
Y YELLOW
RRED
GR GREY
BK BLACK
CL CLEAR
CAUTION:
HEAT SINK
(HOT/LIVE)
VERY HIGH
VOLTAGE &
TEMPERATURE
(PIEZO SENSOR NN-V689 ONLY)

9
4. DESCRIPTION OF OPERATING SEQUENCE
4.1 Variable power cooking control
HIGH VOLTAGE INVERTER POWER SUPPLY (U) controls
output power by a signal from Digital Programmer Circuit (DPC).
Power relay 1 stays on to supply power to the inverter circuit.
The outpower is controlled by the drive signal level from the
inverter circuit.
NOTE 1: The ON/OFF time ratio does not correspond with
the percentage of microwave power since approximately 2
seconds are required for heating of magnetron filament.
NOTE 2: If microwave cooking is over 8 minutes with HIGH
power, fan motor rotates for 1 minute after cooking to cool
oven and electric components.
4.2 Grill cooking
The digital programmer circuit operates power relay 4 in the
sequence as shown in the table
4.3 Combination cooking
Combination cooking is accomplished by microwave and grill
cooking. The digital programmer circuit controls ON-OFF time of
power relay 4 and the inverter control signal level, as shown in
the table.
NOTE: After grill and combination cooking, fan motor
rotates for 1 minute to cool oven and electric components.
4.4 Autoweight defrost, autoweight cook
When those auto control feature is selected and Start pad is
pressed:
1. The digital programmer circuit determines the power level
and cooking time to complete cooking and indicates the
operating state in the display. The table shows the
corresponding cooking times for respective weight by
categories.
2. When cooking time in the display window has elapsed, the
oven turns off automatically by the controlled signal from the
digital programmer circuit.
NOTE: After one touch menu and auto reheat cooking, fan
motor rotates for 1 minute to cool oven and electric
components.
VARIABLE POWER COOKING
GRILL COOKING
COMBINATION COOKING
AUTOWEIGHT DEFROST
AUTOWEIGHT COOK
POWER
SETTING OUTPUT POWER
APPROX.
RY-1 INVERTER
CONTROL
SIGNAL
HIGH 900W stay ON stay ON
DEFROST 270W stay ON ON/OFF
MEDIUM 600W stay ON stay ON
LOW 440W stay ON stay ON
SIMMER 250W stay ON ON/OFF
WARM 100W stay ON ON/OFF
GRILL NO. HEATER (RY-4)
ON (SEC) OFF (SEC)
1330
2249
31815
COMBINATION
NO. HEATER (RY-4) MICROPOWER LEVEL
ON (SEC) OFF (SEC) LOW SIMMER WARM MED
13300000
22490000
318150000
CATEGORY WEIGHT COOKING TIME
BREAD 100g 50 seconds
MEAT ITEMS 150g 2 mins 21 Secs
MEAT JOINTS 400g 7 mins
CATEGORY WEIGHT COOKING TIME
CHILLED MEAL 200g 2 mins 50 secs
FROZEN MEAL 200g 6 mins 40 secs
FRESH VEG 100g 2 mins 20 secs
FRESH FISH 100g 1 min 10 secs
JACKET POTATOES 200g 9 mins 20 secs
FROZEN POTATOES 100g 4 mins 40 secs

10
4.5 Auto Sensor cook NN-V689WB
Auto sensor cooking is a revolutionary way to cook by
microwave without setting a power level or selecting a time.
All that is necessary is to select an Auto Sensor Program
before starting to cook.
Understanding Auto Sensor Cooking
As a food cooks, a certain amount fo steam is produced. If the
food is covered, this steam builds up and eventually escapes
from the container. In Auto Sensor Cooking, a carefully
designed instrument, called the steam sensor element, senses
this escape of steam. Then, based upon the Auto Sensor
Programme selected, the unit will automatically determine the
correct power level and the proper length of time it will take to
cook the food.
NOTE: Auto Sensor Cooking is successful with the foods
and recipes found in the Auto Sensor Cooking
Guide. Because of the vast differences in food
composition, items not mentioned in the Cooking
Guide should be prepared in the microwave oven
using power select and time features. Please
consult Variable Power Microwave Cookbook for
procedures.
Explanation of the Auto Sensor Cooking process
1. During the first 10 second period there is no microwave
activity, and when calculating the T2 time by using the
formula below make sure this 10 seconds is subtracted
from the T1 time. In other words the T1 time starts at the
end of the 10 second period.
2. T1 Time...The total amount of time it takes the microwave
oven to switch to T2 time after the 10 second period.
3. T2 Time...When the steam escapes from the cooking
container placed in the oven, the steam sensor detects it
and the microprocessor calcuates the balance of the
cooking time. This T2 time is then shown on the display
and the begins counting down.
Balance of cooking time (T2 time)
The balance of cooking time which is called T2 time, can be
calculated by the following formula.
T2 time (in sec.) = T1 time x K factor
NOTE: Remember, the T1 time starts after the 10 second
period. The coefficient K is programmed into the
microprocessor memory and they are listed in the
following table along with P1 and P2 powers.
NOTE: When “More” or “Less” pad is selected, the K
factor varies resulting in T2 time to be increased or
decreased.
Example of calculating T2 time
Example 1: If the T1 time is measured to be 2 minutes and 40
seconds after the 10 second period, and the Auto
program selected is Fish:
T2 = T1 x K
=2 min. and 40 sec. x 0.1
= 160 sec. x 0.1
= 16 sec.
AUTO SENSOR COOK
AUTO SENSOR COOK COMBINATION
CATEGORY P1 POWER P2 POWER K FACTOR
FRESH VEG HIGH HIGH 0.3
FROZEN VEG HIGH HIGH 0.1
FRESH FISH HIGH HIGH 0.1
FROZEN FISH HIGH HIGH 0.1
CATEGORY P1 POWER P2 POWER P3 POWER
JACKET
POTATOES MICRO GRILL MICRO K FACTOR GRILL COOK TIME
HIGH I MED 1 1 120s