Question about Technics SA-AX910 Receiver
Here are some possible solutions.
1. This means the protection circuit is detecting a fault..in this case it could be shorted wires on the speaker or shorted speaker as well.
2. Also, it's probably quite hot somewhere internally. Have you checked to see if the fan is spinning as fast and as such not moving as much air?
3. Check for capacitors or fuse that's blown.
4. The problem is a broken solder joint between a pin on one of the power transistor modules and the circuit board. To fix it, I removed the circuit board from the case and resolder the borken joint. Opening the case is easy. First remove the top of the case. Then remove the 3 screws in front. The front panel can then be pulled off. After that, remove all screws holding the connectors on the back. The circuit board can be detached from the case by removing all the screws from the top of the board. Broken solder joint is probably one of the most common problems with modern electronics.
Posted on Jul 31, 2009
With all of the speakers disconnected, the message indicates that the problem is now internal to the unit. Most likely the final output stage is smoked.
The bad news is that neither of the amp-pac ICs inside this unit are available from Panasonic any more. For reference, the part numbers and costs are listed below.
Posted on Aug 04, 2009
You`ve probably blown the output chip which powers the speakers. Unfortunately the damage is done, You`ll need to take it to an engineer but BEFORE you get it back after repair, check ALL your speaker connections, NO tape joints and good tight connections to the terminals at the back of the set and speakers. If you do have to patch the cables, employ good quality soldered and stagger the joints or you will be paying out for the same repair again. Ian
Posted on Jul 30, 2009
Measure the voltage on the resistor, you're talking about
if reading is over 0.7v, the transistors connected to it out,
and measure the voltage again
Posted on Jul 22, 2009
The unit will not come on when there is a real voltage problem being sensed. Hence the 12v to the fan stays off. Keep everything (spkrs and inputs) unplugged from the chassis. While turned on measure with a voltmeter at the center lugs of the large-twin-5 watt resistors in front of the power output transistors. If you have voltage on one but near zero on the other, the channel with the higher voltage is the side with shorted parts. (usually the output transistors) Check those guys with an ohm meter and no power on. Also check the resistors feeding power to the driver transistors. (the transistors that drive the outputs) You may need some service work on this baby.
Posted on Jul 20, 2009
"overload" message shows that protection circuit in amplifier detected error in amplifier output section and activated for some reason.
Please check any dry solder joints on amplifier output circuit board and power supply section and resold them to fix that problem.
In case output section got serious problem then receiver needs qualified tech to replace defective parts.
Posted on Jul 19, 2009
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Posted on Jan 02, 2017
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