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The AKAI 1720 model reel to reel tape recorder described in this Manual is quite an old unit - circa late 1960's. As a consequence, the description of the mechanical details - and adjustments thereof - is quite critical. The manual does this quite well. The schematics are also well presented and have detailed PCB overlays. Probably the only negative is that some half-tone detail has been lost from the original manual as it has been scanned in simple B&W.
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Perfect source for service manuals: fast and professional transaction; high quality, perfect readable and largely scaleable PDF; complete schemes, diagrams and spare part list. Tnx a lot, cu again!!!!
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I got your link from a friend and I must say that I am really satisfied with your service. Specially this B&O manual I didn't find anywhere on the web... but you could deliver it :-) . You deliver very fast and the copy is of good quality. So your webpage is bookmarked. Thanks
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This was the Sony CCU-500A Service manual I was looking for.
The price was reasonable.
The permission to download was quck.
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Excellent printing quality.
A complete and very usefull service manual with all details.
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A+++++++++++++++++++++++++
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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