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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 KENWOOD TR-7400A 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.

The manual is available in languages: English

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Customer Reviews
5 of 5 Stars! TR-7400A KENWOOD Service Manual by David Bird;
A site where discontinualed schematic diagrams and back dated information can be found on discontinued radios tv's and any electronic equipment can be found. Newer manuals either Service and operating manuals. Radio amateurs should find this site a great source for ham radio equipment manuals. I will return to this site should I need information on any electrical equipment. priced easy to download in a PDF format and print pages need to undertake the repair.
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Thank you very much for the manual. It is what I needed and it will be very helpful to me. The delivery of the manual was easy and very fast. I strongly recommend this site to other users. Best regards.
 LDL1002 PHILIPS Service Manual by Róbert Galambos;
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 CDXM30 PIONEER Service Manual by Angelo Gallina;
Manual acquired with good resolution, complete in all its pages, very good policy of the folder where are saved all products purchased.
 UXP3R JVC Service Manual by Angelo-Marco Farina;
Service manual very complete and clear. It was very helpfull for my work.
 T-4970 ONKYO Service Manual by Mihai Mihalache;
This is the 2nd time I download manuals from this website and I can say it's what I was expecting. It contains schematic, layout (decent quality), short description, parts and dissasembly instructions. I recomend it for anyone who wants to repair/modify this device.

Text excerpt from page 9 (click to view)
These circuits, consisting of IC5 to IC12, are basically a MODULO-N PROGRAMMABLE counter of IC5 to IC7 added with an EXTENDER consisting of a D-flip-flop of lClO and a logic circuit of IC8, 9, II and 12. I t belongs to the high-speed scaling method. Fig. 4 shows the operation of the circuits. The operation is simply described below. A division ratio is preset in the MC74416 of IC5 to IC7 with a BCD code. The division ratio preset lies between 400 and 799 in relation to digital indication (144.00 147.99). While, since the IF signal entering the MC 74416 is 5.37 9.36 MHz t o eliminate beat interference in reception, the division ratio must be 537 936 actually. For this purpose the gate, No, serves to raise the division ratio by 137. The gate circuit, U and D, shifts frequency by f600 kHz for repeater operation which is equivalent to the div~sion ratio of 137 f 60. MC74416 is a decrement-

ing counter which counts in the order of 0, 4, 3, 2, 1 , 0 ( 5 ) , 4, 3, ..... receiving input pulses, assuming that preset value is 5 and PE is "0" ( L level). But output becomes "1" ( H level) only when the count is 0. I t means that five input pulses make one output pulse and the frequency is divided t o 115. With three ICs connected in cascade, the division ratio can be raised up to 999. IClO is a high speed D-flip-flop which improves the operating frequency of MC74416, 8 MHz (min.), by

B. a factor of two or more with the aid of gates A and Fig. 4 shows the case where the least significant digit
of the actual division ratio, Ns, is 7. Although resetting should be done at the rise of input pulse and presetting should be done at the decay of the input pulse when the count has become three, the level at A is set to L at the count of five and i t becomes the output of IC10-1 at the next pulse. This output ( 0 1 ) resets the MC74416 and presets it t o N at the same time, but counting is not performed since PE remains at the L level during the next




Fig. 4


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Circuit Diagrams

Set of circuit diagrams. The diagrams will be provided as PDF file. The file will be delivered after…
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