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There are currently no product reviews.
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I do not have very much to say.
The price is quite covenient, delivery was better as promised (about 12 ours, against the specified 24 hours if I remember well), and the quality of the PDF is more than acceptable.
The Service Manual of Sansui R30 itself is also satisfactory: good graphic for schematics and layouts, simple and well structured.
Giovanni Bianchi
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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.).
 ;
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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[6] AUDIO SYSTEM
Flowchart of Failure Analysis for The Audio System
=> AU1 Has the sound been emitted from the speakers? Yes No Is sound muting set? No Is the volume set to 0? No Is a headphone inserted? No Is a SPDIF signal input to IC7602 (DP TX)? (pin 6) No Is a SPDIF signal output from IC5801 (MSP)? (pin 126) No Yes Check around the IC7602 (DP TX) and the communication with the microcomputer, and replace the System Cable. Repair the failure points, then check again. Yes Check the IC5801 (MSP) and peripheral circuit and clock output of X5801. Repair the failure points, then check again. Yes Pull out headphone, then check again. Yes Raise the volume, then check again. Yes Cancel muting, then check again.
A
B
42
Go to
A.
C
Has the sound been emitted from the MONITOR OUT terminal? Yes
No
Is a 12 V output from +12V_Reg No output of IC4308 (+12V_Reg) normal? Yes Are signals output from IC5911 (OP AMP)? (pins 1, 7) No Are signals input to IC5911, IC5931? (pins 2, 3, 5, 6) No
Check the IC4308 (+12V_Reg) and peripheral circuit. Repair the failure points , then check again.
Yes Check the IC5911 (OP AMP) and peripheral circuit. Repair the failure points , then check again.
43
Yes Check the peripheral circuits and the communication with the microcomputer. If there was no problem, replace the IC5801 (MSP).
D
44 45
Go to
A.
Has the sound been emitted from the Headphones?
No
Is sound muting set? No Is the volume set to 0? No
Yes
Cancel muting, then check again.
Yes
Raise the volume, then check again.
E
Is a 5 V output from +5V_Reg No output of IC4310 (+5V_Reg) normal? Yes Is a signal output from IC5971 (HP AMP) ? (pins 1, 7) No
Check the IC4310 (+5V_Reg) and peripheral circuit. Repair the failure points, then check again.
Yes Check the FFC (J201) between the MAIN BLOCK and FRONT IO Assys. If there was no problem, replace the IC5971 (HP AMP) or FRONT IO Assy.
46
Yes Check the IC5801 (MSP) and peripheral circuit and clock output of X5801. Repair the failure points, then check again.
F
Is a signal output from IC5801 (MSP)? (pins 38, 39) 47 No
Go to
A.
KRP-M01 33
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