Panasonic NN-S781 Quick start guide

Panasonic Microwave Oven
QPQ
Australia
BF WF SF
NN-S781 
NN-S761 
NN-S751 
NN-T791 
PART NO. 541204 MICROWAVE OVEN NN – T791SF QPQ
Specifications NN-S781 NN-S761 NN-S751 NN-T791
Power Source: 230V-240V AC Single Phase, 50Hz
Power Requirement: 1040W 1040W 1040W 1040W
Output (IEC705-88): 1200W 1200W 1200W 1200W
Microwave Frequency: 2450MHz
Timer: 30 min. / Stage (HIGH Power) -- 5 Stage Maximum
90 min. 99 sec. / Stage (Other Power Levels) - 5 Stage Maximum
Outside Dimensions: 21 7/8"(555mm)(W) x 19 9/16" (497mm)(D) x 11 15/16” (301 mm)(H)
Oven Cavity Dimensions: 16 7/16"(418mm)(W) x 18 1/2" (470mm)(D) 9"(228mm) (H)
Weight: 36 lbs / 16.5kg
Output power: IE 705-88 Test Procedure
Specifications subject to change without notice.
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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.
WARNING
1. This product should be serviced only by trained, qualified personnel.
2. Check for radiation leakage before and after every servicing according to the "procedure for measuring
radiation leakage." 3. If the unit cannot be repaired on site, advise the customer not to use until unit is
repaired.
4. There are special components used in the microwave oven which are important for safety. These parts
are marked with a Lon the replacement parts list. It is essential that these critical parts should be
replaced only with the manufacturer's specified parts to prevent microwave leakage, shock, fire, or other
hazards. Do not modify the original design.
When troubleshooting or replacing parts, please refer to the country identifications shown below for your
applicable product specification.
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
(D) Any defective or mis-adjusted components in the interlock, monitor, door seal, and microwave generation
and transmission 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.

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DANGER OF HIGH VOLTAGE AND HIGH TEMPERATURE (HOTILIVE) 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.
NEW HV
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. Aluminium heat sink is energised 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 aluminium 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 Ioose. 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

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