Help needed Output Transistors blown
Hi can anyone help me please?
i have a Non branded Amp called Pro-240
4 Transistors have blown
and 1 resistor
the numbers on the transistors are A940
only info i can get is this
http://126.96.36.199/search?q=cache...df/To-220/A940(TO-220).pdf%3FPHPSESSID%3D597428d6d3003a87c0d6ecd0718 50b87+transistor+A940&hl=en&ct=clnk&cd=1&gl=uk&lr= lang_en
i am strugeling to get this in the UK or find an equivilant
What's the power output of this amp and do you have the circuit?
This is an odd transistor ( The full part no is 2SA940 ) for a power amplifier it looks like its supposed to drive a TV or Monitor. Full data sheet at: http://pdf1.alldatasheet.com/datashe...EC/2SA940.html
The C2073 which I assume is the NPN complementary part - again full part no is 2SC2073 data at: http://pdf1.alldatasheet.com/datashe...C/2SC2073.html
This may help you find replacements
A970 is in fact 2SA970. You could substitute it with MJE15031 which is easily available and a very reliable device.
Hi thanks for reply
i do have the PCB out and can post a picture of the circuit
the other numbers on the Transistors that have blown are as follows
There is a Italic F at the top am assuming thats the brand
then in a embosed circle (U) then 537
then underneath A940
this is all the info i have on the amp
PA DJ Amplifier - "PRO 240" 480 Watt
Art Nr: AW1248244
480 Watts power!
High performance amplifier with 19” width, 2HE
High power and fidelity paired with a convincing design!
Fits in every system as easy as winking (19” standardised)
Ideal for monitoring, PA use, parties etc.
Stable 19” steel-body, 2HE
Powerful 2x106W RMS at 8 Ohm
Distortion factor >0,3%
Signal-to-noise ratio 80dB
Separated mixer for volume left/right
Peak and Protection LEDs
Front-sided on/off switch
Back-sided high-performance ventilator
Input over 6,3mm jack
Speaker output with golden 4mm screw plug terminal, PA cable or Jack
Safety switch (short-circuit-resistant)
Dimensions B x H x T: 485 x 95 x 270 mm
Weight 9 kg
Hi it was A940
but thanks for help
Think ive found them what luck
Hi the 2SC2073 is NPN like you say but the original is PNP will this matter?
So, previous posts is still valid. You can replace 2SA940 with MJE15031.
If the amp doesn’t contain 2SC2073, you need not to bother.
If it has, MJE15030 is a good substitute.
Hi thanks for that
there is a few variations in teh data sheet but with MJE15031 as the Mhz is 30 but on my A940 it is 4 will these mater
It could be that the amp will oscillate and you will need a scope to watch if it does. A schematic would be real handy but I'm afraid you will not have that.
As for now, try posting a clean picture of the amps inners, concentrate on the output stage.
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