Jianlong AV320 Power Amplifier Volume Automatically Increasing Repairing Circuit

Published:2011/8/4 10:02:00 Author:Robert | Keyword: Jianlong, Power Amplifier, Volume, Automatically, Increasing, Repairing | From:SeekIC

Each time it has set the volume at the starting time of the device, the volume would be increasing automatically and slowly until the maximum value. This device's volume control IC's model name is erased, and the volume could be remote controlled and also be controlled by hand. To narrow the repairing faults's range, it could firstly pluck the connection plugin to the remote-control circuit and try the device. If the fault still remains, it proves that the fault is not in the remote-control circuit, and it is in the part of electronic volume control circuit.The electronic volume control circuit TC9153's function pin is the same with it, which is shown in the picture. The signal inputs from pin 5 and pin 12. The pin 2, pin 3, pin 14, pin 15 are connected with 4558 for buffering and amplification. And the signal outputs from pin 6 and pin 11. It uses the pin 9 and pin 10's low voltage level pulse signal to achieve the control of the volume's increasing and decreasing.



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