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Happy to find finally a schematic for this amplifier. The schematic is of good quality, the pcb layout is useless: all is black. Never the less, it is very easy to find the components on the board using the schematics.
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Hard to find manual was ready the next day. Scans were very legible (including schematics). All the essential parts of the service manual were present (adjustment procedure, schematics, and parts list). It would have been nice if the rest of the manual was included (disassembly procedure, theory of operation, etc.).
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The Service Manual for the Kenwood KR-V55R provided by owner-manuals.com was as described/advertised. The contents provided the necessary information to effect a diagnosis of the unit. The schematics above all else was instrumental in tracing the the signal flow from component to component.
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This manual was the factory original. Excellent value and contained all the details I needed. Easy dowwnload provided the information when I needed it.
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Impeccable, document très complet. Perfect, i get all i need. All schematic are correct. Thanks
CDR25/CDR26
harman/kardon
Disc recognition is abnormal
Is there CDR/RW signal input normally?(IC201 pin 33) YES
NO
Is there RECD1, RECD2 signal output normally? (IC301) YES
NO
Go to �RF output is abnormal�
Go to �Track Servo is unstable�
Replace IC203 (MICOM)
RF output is abnormal
Is there PICK UP(A,B,C,D) output normally? (PN301 pin 8,9, 14,15) YES
NO
�Check the PICK UP FFC. �Replace the PICK UP
NO
Go to �Laser is abnormal�
Is RRF signal output normal?(IC301 pin 82) �First Recognition try : Over 1.7 Vpp �Second Recognition try : Over 0.5 Vpp YES
NO
�Check the connection between PN301 and IC301. �Replace the IC301(CXA3558R).
OK
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