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El manual esta muy detallado, los numeros de partes y los esquemas de despiece son correctísimos y muy claros, tanto para los técnicos experimentados como para los novatos.
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Ottima qualità grafica e completo nelle notizie. Costo abbastanza contenuto.
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Great and quick support. The maual was exactly what I was looking for and my problem
solved. Many thanks.
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Very good service Within one day i received a pdf of the users manual and electric circuits so I was able to measure the different voltages in the printed circuit and find out the fault Payment was also reliable and easy.Without the manual i could not have repaired.So thanks to "Search for a manual"
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you are doing great job guys.....my father ask me to find out the schematics of Sony KV25R1D to sort out the problem ..(he was electrical technician, and excperianced with TV and simillar stuff). finally he found the cause and change all necessary parts....now he has got working old dog..and is very happy!!... thank you all.. NB..he also saved the repair cost.
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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