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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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The manual is of better quality compared to other. I found it less expensive and therefore it it is the best buy cost vs quality.
2-4-2. Switch, Indicators, Audio and Communication Circuit Check by an Oscilloscope
1. Connect the pin 7 of CN1 on the AU-254 board to the + terminal of the power supply, and the pins 1 and 2 of CN1 to GND of the power supply. Use the modified RK-8XXX cable to facilitate the check required. (Refer to step1 in 2-4-1. Switch, Indicators and Audio Circuit Check.) 2. Connect the pin 4 of CN1 on the AU-254 board to GND of the power supply. 3. Set a DC out voltage to +15 V, and turn on the power switch. 4. Two seconds later, all response indicators (D1 through D6 on the SW-952 board) flash. 5. Disconnect the pin 4 of CN1 on the AU-254 board from GND of the power supply. 6. With transmitting �55H� code from the pin 3 of IC1 (TxD terminal) on the SW-952 board, all response indicators light. With all response indicators flashing, that is, without lighting, it is abnormal. Check the signals between the pin 1 of IC1, the pin 3 of IC1 and the pin 4 of CN1 on the AU-254 board. 7. (a) Switches and indicators check Perform the same step as step 7(a) in 2-4-1. Switch, Indicators and Audio Circuit Check. (b) Audio circuit check Perform the same step as step 7(b) in 2-4-1. Switch, Indicators and Audio Circuit Check. (c) Communication circuit check Using an oscilloscope, confirm that �55H� code is transmitted to the pin 4 of CN1. With transmitting �55H� code to the pin 4 of CN1, it shows the following waveform on the oscilloscope.
Start bit
2-4-3. Indicators, Audio and Communication Circuits Check by EA-80 connected to LLC-8000
1. Press the POWER switch on the LLC-8000 to turn the total LLC-8000 system on. (Do not press the ATTEND button on the LLC-8000. Not pressing the ATTEND button does not light the indicator located at the left-above the monitor button on the LLC-8000.) 2. Check switches, indicators and audio circuit by the same steps as steps 3 through 7 in 2-4-1. Switch, Indicators and Audio Circuit Check. 3. Communication circuit check. When the communication is established, the indicator that shows the student unit, EA-80, being checked and located at the left-above the monitor button on the LLC-8000, lights. 4. Press the POWER switch on the LLC-8000 to turn the system off.
b6
b�
TXD TERMINAL "55 H"
5 0.42 msec
5
H
2-4
Stop bit
1
0
1
0
1
0
1
EA-80
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