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This is a high quality manual with clear schematic and components layout diagrams ; with service procedure included.
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This service manual for the Kenwood KT-990D was reproduced really well ,is very legible and manual is complete.Combined with the low price paid,in the future,I will be checking Owner-Manuals.com any time I need a manual.
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When I purchased this manual I had my doubts regarding the quality as the price was so reasonable as compared to other outlets.
The manual itself is of high standard the print is very clear as are the diagrams. Obviously with the diagrams one has to zoom in otherwise it is to small to be able to read.
Overall I am very pleased with the company who delivered as they said and with the manual they supplied.
I occasionally require a manual and now having registered with this company I shall order from them in the future.
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I was at first dubious about payiong for downloaded manuals but having done so, I was extremely impressed with quality of the two manual I ordered, well worth the small price I paid.
I would highly recommend these to my friends.
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reasonable price for the schematic - the service is perfect, all as expected and pointed by instructions - good scan of the original plans - thank you!
TEST PROCEDURES
PROCEDURE LETTER
COMPONENT TEST MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION. CARRY OUT 3D CHECKS. Isolate the magnetron from high voltage circuit by removing all leads connected to filament terminal. To test for an open circuit filament use an ohmmeter to make a continuity test between the magnetron filament terminals, the meter should show a reading of less than 1 ohm. To test for short filament to anode condition, connect ohmmeter between one of the filament terminals and the case of the magnetron (ground). This test should be indicated an infinite resistance. If a low or zero resistance reading is obtained then the magnetron should be replaced.
MICROWAVE OUTPUT POWER (IEC-60705-1988)
A
The following test procedure should be carried out with the microwave oven in a fully assembled condition (outer case fitted). Microwave output power from the magnetron can be measured by way of IEC 705, i.e. it is measured by how much power the water load can absorb. To measure the microwave output power in the microwave oven, the relation of calorie and watt is used. When P(W) heating works for t (second), approximately P x t/4.187 calorie is generated. On the other hand, if the temperature of the water with V(ml) rises �T (°C) during this microwave heating period, the calorie of the water is V x �T. The formula is as follows; P x t / 4.187 = V x � T P (W) = 4.187 x V x �T / t Our condition for water load is as follows: Room temperature ........... around 20°C Power supply Voltage .............. Rated voltage Water load .................................. 1000 g Initial temperature .............................. 10±2°C Heating time ................ 52 + 3 = 55 sec. P = 80 x �T Measuring condition: 1. Container The water container must be a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm. 2. Temperature of the oven and vessel The oven and the empty vessel are at ambient temperature prior to the start the test. 3. Temperature of the water The initial temperature of the water is (10±2)°C. 4. Select the initial and final water temperature so that the maximum difference between the final water temperature and the ambient temperature is 5K. 5. Select stirring devices and measuring instruments in order to minimize addition or removal of heat. 6. The graduation of the thermometer must be scaled by 0.1°C at minimum and be an accurate thermometer. 7. The water load must be (1000±5) g. 8. �t� is measured while the microwave generator is operating at full power. Magnetron filament heatup time is not included.
NOTE: The operation time of the microwave oven is �t + 3� sec. (3 sec. is magnetron filament heat-up time.) Therefore total heating time = 55 sec.
R-634 - 13
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