MUSICALFIDELITY musical fidelity amplifier CD boot can hear the relay sucks and shuts right after disconnecting -Service Manual Download|Circuit Download|Download Drawings|schematic download|route map download|free download user manual

Your current location：Home > Technical Articles > Audio

MUSICALFIDELITY musical fidelity amplifier CD boot can hear the relay sucks and shuts right after disconnecting

Time：2015-06-06 08:17:24 Source：Network Author：Unknown Clicks：1630

After you break the connection between the power amplifier and power measurements, plus or minus 71 Volt and 9 volt is still not working properly, how the short circuit is not load the transformer itself, hand had serious burns. After you replace the small transformer to test the machine works fine. Left and right channel sound is heard, try half an hour to find the right channel sound hoarse until the water disappears. Due to the machine circuit structure quite independent, Hou level around channel separate placed, separate power, Qian level around channel separate for a Zhang circuit board, before and after level Zhijian signal line with of is can pulled plug of RCA Lotus head interface, with oscilloscope measurement fault Shi right channel Hou level entered end no signal, measurement Qian level entered end has signal, description fault points in Qian level Board Shang. Clean preamp Circuit found that

Signals from the line after mechanical input selection switch select output to the amplifier, line levels amplified and sent to the output relay, because it equips the preamp output, this rotation function relay output, so here is a set of relays. Preamp Board really is a power amplifier circuit, the Board removed separate positive and negative power supply can power through left and right channel check found, right channel of amplifier tube Q302 bias resistor damaged, will come into effect when the bias charge capacitor releases Q302 into saturation, then until his voice disappeared. Replacement to test the machine no longer fails. Special note on the preamp Board used two small tubes, the tubes of this type did not see the occurred in the domestic machine.

2 Home Previous 1 2