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The manual is well organized and is easy to read. The chapters are following normal way to proceed.
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This scanned manual is well done in that most all the pages except for one is straight and clear- the way I would do them. One page was upside down but that happens. For the money that is charged on this site you get a pretty good deal. Now with complex repairs, I still prefer to us paper manuals which I have to buy at stereomanuals but the one I got here was much less than the $45 he was charging but this is a larger than normal manual for three different units. I am a picky manual user because I have used original manuals from Sony and Teac.
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Very useful service manual, was exactly what i needed.Good quality,reasonable price.Thank you.
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Acurate informations inside the SM and I could repair my old Sansui SC-3330 without any problems. Thanks.
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I used it to repair a NAD 7030, but unfortunately, the 7045 is different !
But documentation was useful.
DV-05, DV-S5
7.4 CIRCUIT DESCRIPTION
7.4.1 VIDEO SIGNAL PROCESSING BLOCK
7 CXD1854Q Block
The major processing functions of the CXD1854Q block are: (1) Field-correlative cyclic digital noise reduction (2) Block noise reduction (3) Horizontal contour compression These functions are performed for the Y signal and not performed for the C signal.
(1) Field Correlative Cyclic Digital Noise Reduction
For eight-bit digital video data input to the CXD1854Q, noise reduction is achieved through the subtraction of data of one field from the corresponding data one field before. This data is stored in a buffer zone where the subtraction process takes place and this buffer zone is a 512Kbit DRAM. The noise signal detected as a result is sent to a non-linear circuit. If the difference is larger than a specific value, it is regarded as �a change in picture,� and no canceling calculation is made.
(2) Block Noise Reduction
The Horizontal Block Noise components in the field which are generated through DCT for the MPEG encoding are rejected. They are detected through comparing input data between blocks. The noise signal detected as a result is sent to a non-linear circuit. If the difference is larger than a specific value, it is regarded as �a change in picture,� and no canceling calculation is made.
(3) Horizontal Contour Compensations
This is performed by emphasizing components in the region of 2.3MHz.
7 MC44724A Block
The digital video encoder MC44724A changes the digital component signals to analog video signals (Y signal, C signal, Cr signal and Cb signal). It is added the digital video encoder for the digital processing of CXD1854Q.
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