FEATURE CHART ...........................................................................3DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE ............... 13
CONTROL PANEL ...........................................................................3COMPONENT TEST PROCEDURE ........................................................16
OPERATION AND DIGITAL PROGRAMMERMEASUREMENTS AND ADJUSTMENTS ...............................................18
CIRCUIT TEST PROCEDURE ........................................................5PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE...19
DESCRIPTION OF OPERATING SEQUENCE ...............................9EXPLODED VIEW AND PARTS LIST ......................................................24
CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING ....11SCHEMATIC DIAGRAM &
PARTS LIST OF DIGITAL PROGRAMMER CIRCUIT .............................25
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPOSURE
TO EXCESSIVE MICROWAVE ENERGY
(A)Do not operate or allow the oven to be operated with the
door open.
(B) Make the following safety checks on all ovens to be serviced
before activating the magnetron or other microwave source,
and make repairs as necessary:
(1) Interlock operation
(2) Proper door closing
(3) Seal and sealing surfaces (arcing, wear, and other
damage)
(4) Damage to or loosening of hinges and latches.
(5) Evidence of dropping or abuse
(C) Before turning on microwave power for any service test or
inspection within the microwave generating compartments,
check the magnetron, waveguide or transmission line, and
cavity for proper alignment, integrity and connections.
(D) Any defective or misadjusted components in the interlock,
monitor, door seal, and microwave generation and trans-
mission systems shall be repaired, replaced, or adjusted
by procedures described in this manual before the oven is
released to the owner.
(E) A microwave leakage check to verify compliance with the
Federal Performance Standard should be performed on
each oven prior to release to the owner.
WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not
contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair
the product or products dealt with in this service information by anyone else could result in serious injury or death.
>
1.This product should be serviced only by trained, qualified personnel.
2.Though this product has been manufactured in compliance with:
“Federal Performance Standard 21 CFR Subchapter J”(D.H.H.S): U.S.A. models
or “Radiation Emitting Devices Act”(Health and Welfare Canada): Canadian models
it is very important all repairs should be made in accordance with procedures described in this manual to avoid being exposed
to excessive microwave radiation.
3.Check for radiation leakage before and after every servicing according to the “procedure for measuring radiation leakage.”
4.If the unit cannot be repaired on site, advise the customer not to use until unit is repaired.
5.Any serviceman who learns of any accident pertaining to microwave radiation leakage including the oven operating with
open door should immediately notify the appropriate address listed below and Center for Devices and Radiological Health,
DHHS.
IN U.S.A.Panasonic Services CompanyIN PUERTO RICOPSC
(PASC)50 Meadowland Parkway,(PSC)San Gabriel Industrial Park
Secaucus, New Jersey 0709465th Infantry Ave. Km.9.5
Attention: Technical Service Division.Carolina, Puerto Rico 00985
(201)348-7000(787)750-4300
IN CANADAPanasonic Canada Inc.
(PCI)5770 Ambler Drive, Mississauga,
Ontario, L4W2T3
(905)624-5010
6.There are special components used in the microwave oven which are important for safety. These parts are marked with
a on the replacement parts list. It is essential that these critical parts should be replaced only with the manufacture’s
specified parts to prevent microwave leakage, shock, fire, or other hazards. Do not modify the orginal design.
>
DANGER OF HIGH VOLTAGE AND HIGH TEMPERATURE (HOT/LIVE) OF THE INVERTER POWER SUPPLY (U)
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 circuits.
It functions the same as the high voltage transformer and high voltage capacitor in ordinary microwave ovens.
2.Aluminum heat sink is energized with very high voltages and high heat energy.
3.Very high voltage may remain in circuitry even when oven is off. High voltage may remain in the capacitors
on the board.
DO NOT:
1.Do not touch circuitry because it has very hot (high voltage) circuitry. Even when replacing board, extreme
care should be taken to avoid possible electric shock hazards. High voltage may remain in circuit.
2.Do not touch aluminum heat sink because it is very hot in high voltage and also very hot in high heat energy.
3.Do not try to adjust or tamper with preset volume on the Inverter board because it is very dangerous to
adjust without proper test equipment.
4.Do not test oven while Inverter grounding plate or screws are loose. It is very dangerous to operate H.V.
Inverter Circuit (U) with loose mounting screws or if improperly grounded.
5.For USA only:
Do not try to repair Inverter PCB because it is very dangerous to repair it. Replace as whole High Voltage
Inverter Circuit unit and return fully re-packed with original shipping box and shipping materials.
INVERTER POWER SUPPLY DIAGRAM
NEW HV
- 2 -
*
*
*
*
*
HEAT SINK
(RECTIFIER BRIDGE)
CHOKE COIL
CURRENT
TRANSFORMER
SAND BAR
RESISTOR
HIGH VOLTAGE
TRANSFORMER
PCB
FILM CAPACITORS
VARISTOR
PRIMARY WINDINGS
SECONDARY
WINDINGS
HIGH VOLTAGE
DIODES
DO NOT TOUCH
LEAD
WIRE
GROUNDING
PLATE
*
4
INVERTER
SUPPORT
BRACKET OF ORIFICE
H.V INVERTER(U)
*
3
1
2
5
7
11
16
17
4
aa
aa
a
9
12
3
8
6
10
FEATURE CHART
- 3 -
CONTROL PANEL
FEATURE
Three Stage Cooking
Inverter Turbo Defrost
Auto Reheat
Inverter Auto Cook
Sensor Reheat
Sensor Cook
Quick Min
Popcorn
Timer
Digital Clock
MODEL
NN-S550WFNN-S540WFNN-S510WF
NN-S520WFNN-S530WF
NN-S560WF
NN-S560(CPH)
NN-S560(APH)
1
2
5
7
11
16
17
3
8
6
12
9
NN-S550
7
1
2
4
bb
bb
b
17
3
6
16
11
5
8
10
k
lb
oz
Popcorn
Inverter
Turbo
Defrost
(lb/k)
Auto
Reheat
(1-4servings)
InverterAutoCooking
Power
Level
(10Levels)
Quick
Min
Start
Stop/
Reset
123
654
789
Clock
0
Timer
Froz.Veg.
11.
Froz.
Entrées
8.
Breakfast
(-)
13
Dinner
67
(-)
FreshVeg.
10.
Serving
/
Weight
Rice
12.
Potatoes
9.
Lunch
45
(-)
4
aa
aa
a
- 4 -
CONTROL PANEL
NN-L520
7
1
2
4b
17
3
13
6
16
11
5
8
14
15
NN-L530
1
2
4b
17
3
13
6
16
11
5
8
7
14
15
(1) Display Windows
(2) Popcorn Pad
(3) Inverter Turbo Defrost Pad
(4a) Sensor Reheat Pad
(4b) Auto Reheat Pad
(5) Power Level Pad
(6) Number Pads
(7) Timer Pad
(8) Clock Pad
(9) Sensor Cook Pad
(10) Inverter Auto Cooking Pads
(11) Quick Min Pad
(12) More /Less Pad
(13) Cooking Guide
(14) Auto Cook Pad
(15) Serving/Weight Pad
Before cooking: One tap clears your instructions.
During cooking: One tap temporarily stops the
cooking process. Another tap cancels all your
instructions and time of day or colon appears on
the display window.
(17) Stop/Reset Pad
One tap allows oven to begin functioning. If door is
opened or STOP/RESET Pad is pressed once during
oven operation, START Pad must again be pressed to
restart oven.
(16) Start Pad
5
MN-S510
7
1
2
4b
17
3
6
16
11
8
10
NN-S540
7
1
2
4b
17
3
6
16
11
5
8
10
- 5 -
OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST PROCEDURE
When you pluge the power supply cord into the wall outlet, microwave oven automatically enter into the state of lb / oz. If you want
to use g / kg state, please press Start pad after pluging the power source.