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Sony resistor values?

Hi,
Checked the output transistors mn2488 and mp1620 and they are fine.
Was recommended to replace the 0.22 ohm resistor (OK) and the 180 ohm resistor as well. Trouble is the current resistor is 220 ohm (original) so is it possible that this is the norm for 240V Australian models? Would it make any difference?
Thanks a lot (love your site)

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It is recommended to use the same value due to the function of the resistors and their values.
A lower value will let the current flow a bit faster and the higher value will slow it down according to their design.
Try installing the same value of 220 ohms.
Hope this helps.

Posted on May 05, 2008

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Posted on Jan 02, 2017

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most of the time in a sony receiver, when the output transistors are shorted and blowing the fuse, it doesn't take any more than replacing the outputs and fuse then you should be good to go. They don't usually require any resistors or other components to be replaced.

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Sony srt 750p transitor problem


Transistor Problem


To replace the power transistors ( MN2488 and MP1620 )

• you need to have a technique in soldering.

( much faster is cut the transistors pins , but be careful only for

professional serviceman )


click on the link below:


Soldering Guide

After taking out the burnt transistors:

• get a multimeter and measure the DC voltages present on

each amplifier output stage ( center of the two resistors in series ).

• • it should be no more than 0.7 V, if it s, remove those pair of power

transistors and test again for output voltages.


the negative probe

of the multimeter to the chassis of the unit.


• Do not connect new power transistors yet.

you may need to power it without it.


Until you sure that the unit powers up and have some/other channel

working to prevent further transistors and components failure.





But if there are still more than 0.7 v on some of the outputs


• Check for VAS circuits and Differential Input Stages



Let me know how you make out with the inspection.

It is a good chance you will find something.


hope this helps, thanks for using Fixya!

Aug 09, 2012 | Sony Audio Players & Recorders

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I have a sony STR-de135 receiver whlie looking for one problem created another.While the receiver was unpluged I touched and output transistor MN2488 and it sparked now the left channel sounds distorted so...


The capicitors in the unit are charged. Replacing the output transistor(s) is not a task for a novist. Capicitors, resistors, driver transistors and sometime preamp chips can also be bad as well. If all the bad components are not replaced the parts you replace could blow out again.

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Hi and welcome to FixYa,

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Offhand, since DIY (do-it-yourself) repair is being done and assuming that you are comfortable working with electronic components & circuitry, use of a DVM/VOM, a soldering iron/station and safe practices with electrically powered devices, access to a Service Manual or at the very least, a schematic diagram would be a necessity.
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Ed,

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