Question about Technics SA-AX910 Receiver

8 Answers

I have a technics sa-ax710 receiver that went into power overload I have disconnected all wires and i still get overload when i power on brian

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  • 11 more comments 
  • 3100 wanker Jul 19, 2009

    I have the unit opened where are the amplifier outputboard and power supply located on the 710

    brian

  • 3100 wanker Jul 20, 2009

    I have resoldered most of the joints none looked bad no improvements

    I do not seem to be getting 12 volts to th fan are there any voltage checks i can do

    Brian

  • 3100 wanker Jul 22, 2009

    HI

    Can you give me the board # for the twin 5 watt resitors, output transistors and driver transisters

    brian

  • 3100 wanker Jul 22, 2009

    what is there number on the board or where are the resistors

    brian

  • 3100 wanker Jul 24, 2009

    Is this voltage 0.7v dc or ac voltage

    brian

  • 3100 wanker Jul 27, 2009

    yes the ic is bad i have ordered a new one before replacing it should there be anything else to check

    brian

  • 3100 wanker Jul 28, 2009

    have removed bad ic 602 but stills shows overload

    brian

  • 3100 wanker Jul 29, 2009

    Pin locations 1 and 4 on removed ic 0.00dcv pin location 1 and 4 on installed ic 0.03dcv

    still reading overload

    brian

  • 3100 wanker Jul 30, 2009

    can you tell me the number off this wire

    brian

  • 3100 wanker Jul 30, 2009

    the output chip is that 601 or 602 which i have just replaced

    brian

  • 3100 wanker Aug 04, 2009

    If you check past comments all this has been done board out, new chip installed, no fan works on overload

    brian

  • 3100 wanker Aug 05, 2009

    Thay may not be avalable from panasonic but they are avalable i have already replaced output ic

    brian

    ps its looking like you can not help me anymore is this true

  • 3100 wanker Aug 05, 2009

    no i have only replaced one but i do not think it was bad

    brian

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8 Answers

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  • Master
  • 2,185 Answers

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

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  • Master
  • 4,806 Answers

Hi,
Unplug it from the mains wall socket for an hour or two to see if it will reset.
While its off you can also check to see if the internal fuses and capacitors are in tact.
Please post back if you need more advice or if you find something.



Regards.

Posted on Aug 05, 2009

  • Lee Hodgson
    Lee Hodgson Aug 05, 2009

    Hi sorry about that, the whole page has only just loaded up.
    I see you have replaced a few caps and IC's.

    The problem has got to be on the powerboard itself, something causing feedback to overload the system.
    Have you looked for any blown semiconductors and the main powercoil?

    You could also try re-floating the circuit boards.


  • Lee Hodgson
    Lee Hodgson Aug 05, 2009

    I have found a workaround.
    What is strange the overload switches on only at the beginning when you turn on the receiver.
    Later, when it has already warmed up, this problem (apparently) does not occur. Let it warm up a little and see if the message disappears.
    Damaged transistors are usually Q704 - 2SC3311 and resistor R704 3.9Ohm



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  • Master
  • 4,234 Answers

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.

Dan

RSN36S5A-P $91.26
RSN33M5-P $114.76

Posted on Aug 04, 2009

  • ABRsvcs Aug 05, 2009

    Until just now, I did not see any of your previous responses, only the initial one. After reviewing your responses, I have a question: Have you replaced both large ICs ? Either one can cause the protect message. In my experience, the one that handles the surround channels is more likely to fail. Also, if these are not installed, the unit will still show protect as they provide feedback signals that must be present for the unit to detect the correct status.



    Things to check:



    1) Check the voltage regulators (specifically the +5 and +12). Make sure that the solder connections are good.



    2) There are "feeder" resistors that should be connected directly to the power pins on both ICs. These are small valued resistors (100ohms or less) that are usually flameproof. Check these with an ohm meter to be sure that they are not open.



    I'll look up the schematic later today and try to post some additional checks.



    Dan

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  • Expert
  • 123 Answers

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

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  • Master
  • 11,896 Answers

There is a circuit protection wire that goes from volume control to main board. Pull this wire, leave stereo unplugged for 24 hours so all memory is lost in stereo. Then re-try

Posted on Jul 29, 2009

  • Nate Stansfield
    Nate Stansfield Aug 04, 2009

    You may have faulty capacitor in the board. Check for any swollen or burnt capacitors or burn marks on the circuit board. Usually there is just one wire that goes to protection unit to volume. All other wires besides this one needs to be hooked up

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  • Master
  • 5,807 Answers

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

  • 13 more comments 
  • Rommel Cana
    Rommel Cana Jul 23, 2009

    look for IC- 601

    IC - 602

    they are the candidates

    if ever voltage on pins 1 and 4 exceeds 0.7v replace that Audio IC


  • Rommel Cana
    Rommel Cana Jul 23, 2009

    here is the guide

  • Rommel Cana
    Rommel Cana Jul 24, 2009

    0.7V DC,

    is it over?

    if it is then , it is bad


  • Rommel Cana
    Rommel Cana Jul 25, 2009

    you can also hang the two pins on each amp


    if one of them output more than 0.7V hang the resistors connected to pin 6
    and pin 7

  • Rommel Cana
    Rommel Cana Jul 27, 2009

    you can extract the bad IC

    then try to power up the unit.

    it should not show overload anymore


  • Rommel Cana
    Rommel Cana Jul 28, 2009

    check the other IC for output voltage it might have over 0.7V dc also.

    recheck the output pins of your extracted IC on the circuit board it should not show any voltages at all




  • Rommel Cana
    Rommel Cana Aug 04, 2009

    hi ,

    if you have replaced the outputs of the main amplifier and still on overload

    there might be still trouble on the over voltage detection circuits




  • Rommel Cana
    Rommel Cana Aug 04, 2009

    ok , try extracting all the ic, 601 and 602

    power it on, and post again if the overload indicator is still there ,

    while i am seeking again the schematic of your unit


  • Rommel Cana
    Rommel Cana Aug 20, 2009

    try to extract Q1151

  • Rommel Cana
    Rommel Cana Aug 20, 2009

    here is additional info for you






    here is the part 2




    Replace Q773 2SB621, if these transistor fail there will be sign of overload

    hope i have helped you, thanks for using Fixya!


  • Rommel Cana
    Rommel Cana Aug 20, 2009

    include R776 4.7 ohm 1/2 watt resistor might be open too.

  • Rommel Cana
    Rommel Cana Aug 20, 2009

    here is also additional, in case


    you may need to replace Q708 if there is no -15.2v on Q773


  • Rommel Cana
    Rommel Cana Aug 21, 2009

    did it work? or still looking?

  • Rommel Cana
    Rommel Cana Aug 28, 2009

    how is it doing? did it work?

    i do hope it is already OK


  • Rommel Cana
    Rommel Cana Sep 02, 2009

    i have sent all the possible solution to you

    i do hope you have fix it well.


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  • Master
  • 410 Answers

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

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  • Master
  • 10,594 Answers

Hi,
"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.
Thanks.


Posted on Jul 19, 2009

  • Shahid Electronics
    Shahid Electronics Jul 19, 2009

    I have the unit opened where are the amplifier outputboard and power supply located on the 710

    brian
    ================================================================

    There is big heat sink and Output chips are mounted on it, it is amplifier output section and dry solder joints should be checked underneath, on circuit board. If you follow AC cord that will take you to power supply section in receiver.
    Thanks.

    Below image will help you to locate output section in receiver.




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