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Need schematic for mtx thunder 5400xw - Car Audio & Video

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Hi

cawarr,
Schematics for your unit may not be available on line, but will try

to help you , if you need to work on component level.

The faults are typically in the output or driver stages. You'll also see a

lot of broken and shorted inductors.

Bad op-amps have been a problem as well as bad solder connections on

the small transformer in the audio section


When troubleshooting these Class D amplifiers you may need to

measure first the supply voltages on the Main Amplifiers.

It could be at least +25 and -25 ( sample only )

and the Op amp supply , can range to +12V and -12V but no more

than + 15V and -15V.


Here is tip , should you wish to troubleshoot more:


http://www.fixya.com/support/r4008719-diagnose_not_having_audio_right_channel

the unit and component may not be the same as yours but the

principle in troubleshooting is the same.





How to solder boards properly


How to use a multimeter


Please give us more details on your unit as to assist you further

And give you more possible solution to solve your problem.


Thanks in advance for choosing Fixya for assistance.


Hoping to have a response from you , as i prepare the possible

solution to your problem.


Regards,

palaboy



Posted on May 15, 2010

  • 2 more comments 
  • cawarr May 15, 2010

    Please advise what the component part numbers are for REC902, FET903, FET901, FET904 and FET902

  • Rommel Cana
    Rommel Cana May 15, 2010

    here are the possible replacements:

    IR_IRF1010EZ
    IR_IRF3205
    IR_IRF3205Z
    IR_IRFZ34N
    IR_IRFZ44N
    IR_IRFZ44N
    IR_IRFZ48N
    IR_IRFZ44
    IR_IRFZ46N


    IRF-540 and IRF-9540


    P12P10 and a STP36N06V

    But the best replacements would still be... what is printed on the MOSFET , unless it all blown



    How to test MOSFET





  • cawarr May 15, 2010

    Thank you for your input. Fortunately, I could read the number off one of the mosfets i.e. 60NE06-16 so I will replace all four as they are cracked in half. The REC902 is not the same device, it is physically different and the number is burnt off, please advise.



    Please also provide me with a description / part number for C912 as it is also burnt.



    A schematic sure would make this a lot easier.



    Thanks.

  • Rommel Cana
    Rommel Cana May 15, 2010

    Would it be possible that you describe a little about " REC902 " ?

    a ) Is it on the power supply or on the main amplifier?

    Have all the Power MOSFET ( Main Amplifier , not the power supply ) removed,

    and measure voltages on the rails of the Main Amplifier.


    If there is none , then most probably it is on the power supply





    How to use a multimeter






    Use the Audio Input ground of the amplifier, not the negative or chassis of the amp , as your

    reference ground , when measuring for voltages.


    The supply may rise up , and you may need to measure the DC output of each amp output.

    If , there is more than 0.7V , have to trace for bad driver transistors also.

    Do these before replacing the Power MOSFET to avoid damage on the new replacements.



    A good amplifier never produce an over of 0.7V on its output!



    If there is no output voltages on the power supply ( like +25V and -25V , sample only ), then

    most probably, you need to start with the power supply before replacing the bad Main Amp Power

    MOSFET.


    Failing to do those, will just blow again your new MOSFET.

    Use a regulated power supply ( 13.8V at least 6 A ) when troubleshooting the amplifier or otherwise

    a 12V battery, never use a 12V charger for battery as a power supply.It will only add damage

    to the power supply circuits.Use a low power fuse rating since the Power MOSFET are removed.



    STP60NF06FP
    STP60NF06
    60NF06FP
    STP60NF06FP


    STP60NF06FP STM 2950
    Trans MOSFET N-CH 60V 30A 3-Pin (3+Tab) TO-220FP










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