Question about Audio Players & Recorders
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Posted on Jan 02, 2017
SOURCE: Rear left speaker not playing
If the speaker itself is working then the problem will most likely be the connection point where the speaker plugs into. If you dont know how to check for this problem, i dont really want to tell you just in case you hurt yourself. Take it to a shop and have it looked at by someone thats knows what there looking for.
Posted on Sep 07, 2006
Does the system perform normally- as long as it works? If yes, then the Amplifier is at fault. It cannot be the output Transistors or IC, as the sound is coming from both channels. If you know solid state servicing, I advice replacing all the electrolytic capacitors in the Output stages of the Amplifier. Over a period of time these El Caps dry out, and cause headaches.
Posted on Oct 04, 2006
The flashing blue LED and loss of sound on the Alesis M1 powered monitor is caused by failure of capacitor C8 (220uF, 35V) on the power supply board. It dries up due to its proximity to resistor R4 (47K, 2 W) which gets very hot. This is a design fault.
Remove the power supply board (4 corner screws and 2 mains connector screws) and disconnect the two plugs. Carefully desolder C8 and replace it. Its value is not critical (220 to 470 uF will do) but it should be a 105 deg. type, preferably at 50V.
Remove R4 and replace it with a similar resistor with its leads bent so that it is nowhere near C8, otherwise the fault will return. One end may be connected to one of the existing R4 solder pads (furthest from rear of board), and the other to the top end of resistor R3. Check that you have connected it correctly by inspecting the PCB tracks.
Replace the board and all screws and plugs before testing.
Posted on Jan 01, 2008
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