DOWNLOAD Panasonic NN-C781JF Service Manual ↓ Size: 1.26 MB | Pages: 36 in PDF or view online for FREE

Model
NN-C781JF
Pages
36
Size
1.26 MB
Type
PDF
Document
Service Manual
Brand
Device
Home Appliance / MICROWAVE OVEN
File
nn-c781jf.pdf
Date

Panasonic NN-C781JF Service Manual ▷ View online

Service Manual
ORDER NO. SIMMC 0110022C3
E1
Microwave Oven
Specifications:
Power Source:
Power Requirement:   Microwave
                                    Heater
Output:                        Microwave (ICE 705)
                                    Heater
Microwave Frequency:
Timer:
Outside Dimensions:
Oven Cavity Dimensions:
Weight:
Output power: IEC705-88 Test Procedure
Specifications subject to change without notice.
Specifications:
Models:
240V AC Single Phase, 50Hz .......... For KNQ Models
230V-240V AC Single Phase, 50Hz . For MNQ, YNQ Models
220V AC Single Phase, 50Hz .......... For HNE, TNE, YKE, KKE, ZPE Models
220V AC Single Phase, 50/60Hz ..... For SNM Models
120V AC Single Phase, 60Hz .......... For WNT Models
1260W
1550W
1000W
1515W
2450MHz
30min (HIGH) / 99min. 59sec
400mm (W) x 520mm (D) x 312mm (H)
373mm (W) x 373mm (D) x 206mm (H)
15.5kg
NN-C781JF
NN-C781JF
®
WARNING
CONTENTS
     (Page)
(Page)
- 2 -
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. 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      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.
This service manual covers products for following markets.
When troubleshooting or replacing parts, please refer to the country/area identifications shown below for your
applicable product specification.
HNE ......................................... For Hong Kong
KKE .................................... For UAE, Egypt, Iran
YNQ ......................................... For Singapore
KNQ ................................... For Kuwait, Doha, Quatar
MNQ ......................................... For Malaysia
Oman, Bahrain, Pakistan
TNE .......................................... For Thailand, Indonesia
SNM ................................... For Saudi Arabia
YKE .......................................... For Others
ZPE .................................... For CIS Countries
WNT ......................................... For Tai Wan
FEATURE CHART ............................................................................... 4
CONTROL PANEL ............................................................................... 4
OPERATION AND DIGITAL PROGRAMMER
CIRCUIT TEST PROCEDURE ............................................................ 5
SCHEMATIC DIAGRAMS .................................................................... 7
DESCRIPTION OF OPERATING SEQUENCE ................................... 9
CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING ......... 11
DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE ........... 13
COMPONENT TEST PROCEDURE .................................................... 17
MEASUREMENTS AND ADJUSTMENTS ........................................... 20
PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE ... 21
TROUBLESHOOTING GUIDE ............................................................ 22
EXPLODED VIEW AND PARTS LIST .................................................. 28
SCHEMATIC DIAGRAM &
PARTS LIST OF DIGITAL PROGRAMMER CIRCUIT ......................... 34
!
!
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
- 3 -
*
*
*
*
*
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
GROUND
METAL
RELEASE TAB
TO MAKE FLAT
NEW H.V.
FEATURE CHART
- 4 -
CONTROL PANEL
NN-C781JF
FEATURE
Three Stage Cooking
Grill
Convection Bake
Combination
Turbo Defrost
Sensor Reheat
One Touch Cook              (weight)
Sensor Cook
Child Safety Lock
Delay Start
Timer/Stand
Digital Clock
MODEL
NN-C781JF
Pull Door Handle:
Pull to open the door. Opening the door during cooking will stop the cooking process without cancelling the program. Cooking
resumes as soon as the door is closed and Start Pad is pressed. The oven lights will turn on and stay on whenever the door is
opened. It is quiet safe to open the door at any time during a cooking program and there is no risk of microwave exposure.
Beep Sound:
When a pad is pressed correctly, a beep will be heard. If a pad is pressed and no beep is heard, the unit has not accepted the
instruction. The oven will beep twice between programmed stages. At the end of any complete program, the oven will beep five
times.
Display Windows
Grill Pad
Time Pads
Turbo Defrost Pad
Recipe Stores Pads
Timer Pad
Start Pad
Micro Power 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.
Auto Menu/Sensor Cook Pads
Sensor Reheat Pad
Conv.Bake Pad
Combination Pad
More/Less Pads
Clock Pad
Auto Menu/Auto Cook Pads
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.
Stop/Reset Pad
Page of 36
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Panasonic NN-C781JF Service Manual ▷ Download

  • DOWNLOAD Panasonic NN-C781JF Service Manual ↓ Size: 1.26 MB | Pages: 36 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Panasonic NN-C781JF in PDF for free, which will help you to disassemble, recover, fix and repair Panasonic NN-C781JF Home Appliance. Information contained in Panasonic NN-C781JF Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.