Superb rendition. Drawings (schematics) complete and unabridged. I do a great deal of vintage audio restoration. Documentation is essential for successful repairs. I have found sources over the years that offer good documentation, but rarely all that is necessary. Owner's Manuals has filled that void with complete and legible documentation. They have narrowed my "favorites" to a more manageable collection. This Denon manual in particular contained the latest revisions level, and offered alterations favorable to updating the item. The Illustrated Parts Breakdown (IPB) was well enough detailed to simplify part symbols and physical locations. You will not be disappointed!
Superb manual. Exactly what I ordered and made available in a very timely manner.
Text excerpt from page 25 (click to view)
KD-S901R
3.2.1 Feed section
Is the voltage output at IC521 pin "40" 5V or 0V? YES Is 4V present at both sides of the feed motor? YES Check the feed motor.
3.2.2 Focus section
NO
Is the wiring for IC561 pin 27? NO
YES Is 3.3V present at IC561 pin "20"? YES Check the vicinity of IC521. YES Check the feed motor connection wiring.
NO Check CD 8V and 5V.
NO
Is 6V or 2V present at IC561 "4" and "5"? NO Check IC501.
When the lens is moving: 4V
Does the S-search waveform appear at IC561 pins "8" and "9"?
NO
Check the circuits in the vicinity of IC561 pins "8","9"and"15".
YES YES
Check the pickup and its connections
3.2.3 Spindle section
Is the disk rotated? YES Does the RF signal appear at RF test point? YES Is the RF waveform at RF test point distorted? YES Proceed to the Tracking section
3.2.4 Tracking section
NO
Is 4V present at IC561 pins "6" and "7"? YES Check the spindle motor and its wiring
NO
Is 4V present at IC521 pins "41" ? YES Check the vicinity of IC561.
NO
NO
Check IC521 and IC561.
Check the circuits in the NO vicinity of IC561 "19"~ "24" or the pickup
When the disc is rotated at first:
YES
Approx. 1.2V Is the tracking error signal output at IC501 "11"?
Check the circuit in the vicinity of IC501 pins "2"~"12".
