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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
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7. GENERAL INFORMATION
7.1 DIAGNOSIS
7.1.1 TROUBLESHOOTING
(1) No power (POWER LED not lit)
No power (POWER LED not lit)
A
Has the fuse blown?
YES
NO
PROTECT activated
Diagnose the unit, referring to the explanation of the Protection function.
B
Replace fuse FU1. NO NO Is the POWER LED lit? YES YES Completed. Check if there is short-circuiting. Short-circuiting between +B and GND is highly likely: POWER ASSY : CN12 MAIN ASSY : CN3304,CN3305 AMP ASSY : CN3302 REGULATOR ASSY : CN3303 Has the fuse been blown again?
C
(2) No sound
No sound
D
NO
Is TUNED lit?
Check the voltage at each part in the module. Check the voltage at the following parts: � Transmitter: TX ASSY: CN8201 (Pin 11)
U6 (5V) U17 (5V) U21 (5V) U22(3.3V) [T22] [T33] [T17] [T20]
E
YES
Narrow down the point of failure by checking the AUDIO lines. � Wireless speakers R52 � U2 (Pin 76) � U28 (Pin 7) � CN3701 (Pin 5) � IC3001 (Pin 13) � CN3304 (Pin 1) � CN3306 (Pin 5) � Transmitter JA8202 � CN8201 (Pin 6) � U9 (Pin 2) � U1 (Pin 76) � R74 In a case in which no sound is output from the AMP module Besides the failure in the POWER IC, activation of the MUTE function is possible. Check that Pin 6 of CN3304 is "L" and that Pin 4 of CN3304 is "H." XW-DV1WS
5 6 7
� Wireless speakers MAIN ASSY: CN8201 (Pin 1), RX module: D16 cathode
D16 Cathode [T32] U12 (5V) [T25] U19 (3.3V) [T35]
Note: The numbers in brackets are for the test terminals in the module.
F
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