Question about Audio Players & Recorders
Power failure mostly came from degraded capacitor C515 (22nF 630V pin
located at the side of the fuse. Replace that capacitor. Most people
are having the same problem and their unit start working after
replacing that capacitor. If you have the skill, tools and know where
to buy Capacitor C515, you can do the repair yourself, otherwise, send
your unit to a qualified technician.
Posted on Apr 24, 2010
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Posted on Jan 02, 2017
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Dec 13, 2017 | The Audio Players & Recorders
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possible that the machine does not start off the cycle because there are errors
due to feedback from the inputs. For the program to start up the main program
controller must initiate the INLET/MOTOR/DRAIN
pump/ valve to open up and allow each function to be driven starting from
the flow of water into the drum as also the drain valve to open to exit the
water at the point of the program cycle. If this does not happen then the
voltage at the valve/motor/pump must be checked or the fault relates to no
voltage from the controller. This means
the controller is a suspect.check for output when the cycles is in the SPIN mode, if absent the board is a suspect.
Check for moisture in the board, remove and reset all the connectors to the main board before the processor or the memory can be suspected.
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It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.
Also check the +5 volt on the processor and if this section does not receive power or if the IC is faulty then the system can hang. check the processor input/ouput data .
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