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I ordered this manual sometime in the afternoon and I received it on my e-mail the same evening.
This is a fantastically good and properly scanned copy of the original manual. All pages are of the same scale and they overlap each other. It means that you can print the manual and easily make it as a convenient paper manual.
The content of the manual is fantastic. Alignment descriptions, PCB layouts and elementary diagrams are explicit and precise. I immediately found what I was looking for. Thanks to this manual and Owner-Manuals.com my amplifier is alive again. Many thanx indded!
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The manual was well-scanned and easy to read. As an added bonus, the Operator's Manual was bundled with the Service Manual!
I'd definitely use owner-manuals.com again.
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Finally, i found one website, where i can download this service manual , and fix my hifi. The service manual is very good, and easy to download and to print.
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Complete and very useful. Could have benefited from a little higher resolution on the schematic and layout diagrams for improved legibility.
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Great Service Manual, Very Complete, as advertised, Perfect, Thanks!
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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