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Service Manual

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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of PANASONIC NNS543 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 34 (click to view)
1. Variable power cooking control
The coil of power relay B (RY1) is energized intermittently by the digital programmer circuit, when the oven is set at any power selection except for High power position. The digital programmer circuit controls the ON-OFF time of power relay B contacts in order to vary the output power of the microwave oven from âLowâ to âHighâ power. One complete ON and OFF cycle of power relay B is 22 seconds. The relation between indications on the control panel and the output of the microwave oven is as shown in table. NOTE: 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. P10 P9 P8 MEDIUM-HIGH P7 MEDIUM P6 P5 P4 MEDIUM-LOW P3 P2 P1 DEFROST P3 HIGH

Variable Power Cooking
POWER SETTING OUTPUT POWER(%) APPROX. ON (SEC) 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 30% 22 22 22 22 22 22 22 22 15 8 22 OFF (SEC) 0 0 0 0 0 0 0 0 7 14 0 ON-OFF TIME OF POWER RELAY B (RY1)

2. Inverter Power Supply Circuit NEW H,V
This Inverter Power Supply Circuit supplies 4,000V DC to the magnetron tube from the line voltage,120v 60Hz AC input. functions as the H.V. transformer, the H.V.capacitor and H.V.Diode. 1. The AC input voLtage 120V 60HZ is rectified to DC voltage immediately. 2. DC voltage will be supplied to the switching devices called IGBT. These devices will be switched ON-OFF by the 20 to 40 kHz PWM. (pulse width modulation) signal from the microcomputer in the DPC. 3. This drives the High voltage transformer to increase up to 2,000V AC and approximately 3V AC by means of transformer. 4. Then the half-wave doubler voltage rectifier circuit, consisting of the HV diodes and Capacitors, generates the necessary 4,000V DC needed for the magnetron. 5. Output power of the magnetron tube is always monitored by the signal output from the current transformer built into the inverter ciruit. 6. Then this signal will be fed back to the microcomputer in the DPC to determine operating conditions and output necessary to control PWM signal to the inverter Power Supply to control output power.

Inverter Turbo Defrost

25 min.00 sec.

3. Inverter Turbo Defrost
When this Auto Control feature is selected and the Start Pad is tapped: (A) The digital programer circuit determines the power level and cooking time to complete cooking and indicates the operating state in the display window. Table shows the corresponding cooking times for respective serving by categories. (B) When cooking time the display window has elapsed, the oven tums off automatically by a control signal from the digital programmer circuit.


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