Question about Crown XLS202 2Channel Amplifier

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Crown xls-202 amp doa.has 1 shorted npn and 1 pnp output transistor ,pull both and replaced.unit still doa and circuit breaker does not pop.why no b ?

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You may have to pull it out over again, all of them on the channel where you replaced the power

transistor.


Or you can check for possible shorted collector to emitter pins on each.


Once these power transistors are extracted all in pairs then you can power up ,

just to test if the fuse will still blow.


If it happens , you might have a bad components likewise on the other channel


I will post further if the fuse does not blow anymore to help you finished

your troubleshooting.



Insure that the supply rails have no shorted components along its path.

Check for DC out on all amp outputs and post

Posted on Oct 08, 2010

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Posted on Jan 02, 2017

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1 Answer

Crown XLS 602 power amp: Where inside is the fuse so I can replace it?


Hi Tom,

The fuse you may be referring from the power supply is not

used(none) instead a CB1 or circuit breaker is installed.

These breaker is in series with the power transformer ( trace it).


Disconnect the AC outputs of the power transformer when trying to

reset.( of course with the unit unplugged ).


Measure the output AC voltages, if it is OK

Be happy partially!


Next would be.....


Check for possible shorts on the Positive and Negative Supply

rails to ground or speaker out, for what might have caused the

breaker to tripped.


And these wont be easy troubleshooting , Good luck!!


thanks for choosing Fixya for assistance.

Dec 01, 2012 | Crown XLS 602 2-Channel Amplifier

1 Answer

I have a crown 802 amp,,, lastnight set up to play got everything going playing music threw it and then,,,,10 min later it sounded like someone pulled the power on there ,,went over to kick it back on and...


Hello
surely there is some short circuit inside you amp, which causes heavy current flow, when you switch On it now. The main cause of this type of fault is with shorted audio output section inside the printed circuit baord. will have any shorted Integrated circuit [IC] or power transistor or MOSFET.
Your amp need service. Never switch in ON, until the fault has been rectified, as it may cause more component to be get damged.
Get it serviced by any expereienced service technician, as this work is skilled one, must have thorough knoledge in electronics, all tools to do the work, ability to loacate the faulty component etc. If you have all these, inform me. I'm happy to assist you further. The more you need is patience and concentration. OK.

Feb 05, 2012 | Crown XLS 802 D Amplifier

2 Answers

One of my outputs does not work at all, the other works fine, when i go to bridge it doesnt word even not. How can i find out what issue i must repair, can it be the Si-PNP 250v 16a 250w


hi,
First of all you have to check The positive and negative 95V in the collector pin of all output tansistors. There should be +95V in the all collectors of MJ15024 and --95V in all collectors of MJ15025 poer the output transistors of faulty channel.ANd tere should be +/-- 0.5 volt in all output transistors base pin. All emitter pin should be aproximatly 0V. If not then you have to check the tansistors Q13 to Q16 and Q17 to Q20. Also the driver transistors Q9, Q10, Q11,Q12,.
If you need the schematic diagram that i will sent it to you.
ok

Jul 31, 2011 | Crown XLS 602 2-Channel Amplifier

1 Answer

Crown amp had 2 shorted output transistors.and 1 blown cap.i replaced all.still will not turn on. circuit breaker is fine.what usually goes wrong with these amps? where do i check now?


There is a "driver" stage that sets up the voltages for the output stage as well as a bias circuit. Any of these can have a problem. I would suggest that you take voltage readings at each of the output transistor pins and post the readings here. I might be able to give you a few things to check. Crown designs are not the simplest to diagnose, but we should be able to track it down a bit. Measure each of the pins to gound and post the values here.

Thanks,
Dan

Oct 08, 2010 | Crown XLS202 2Channel Amplifier

1 Answer

Output stage scheme for pioneer vsx-d1 channel floating negative.


It should be a push pull. The fact that you have negative voltage almost certainly means push pull. One side will be constructed using NPN transistors ran off the positive DC rail and the other side will be constructed using PNP transistors ran off the negative rail. I don't know the age of your amp but I know pioneer now uses integrated amp modules instead of discrete transistors.

http://pdf1.alldatasheet.com/datasheet-pdf/view/82968/SANYO/STK412-020.html

example of integrated amp module (sorry for the chinese)

Feb 11, 2010 | Audio Players & Recorders

2 Answers

Power indecate foulty


Most likely one or more pairs of the output transistors is shorted. The amp is attempting to drive a signal into a 0 or low ohm load. This unit should see a service center for repair.

Dan

Jan 10, 2010 | Crown XLS 602 2-Channel Amplifier

2 Answers

Power up problem with alesis rs300 (ra300)


you have more than likely damaged some transistors.
the resistors have burned because of excessive current.
there are 2 typesof transistors,bipolar and mosfet
a bipolar transistor has 3 pins.1) base 2)emitter 3)collector.
an NPN is tested with the + meter lead on the base , and a PNP transistor with the - lead on the base.
TESTING
base to collector should read .5 to .6 v drop in one direction and open in the other with a digital meter on the diode check function.
base to emitter about the same,but slightly higher than the collector.
if base to collector is .5v then base to emitter is .52 or so.it is always higher than the base collector number.
between emitter and collector will read open in both directions.
if there is a short on any lead combination,the transistor is blown.
npn transistors operate on the positive rail power supply,and pnp on the negative rail.
typically a 150 watt amp will run + - 65vdc.
the transistors running on the plus side are npn and on the negative pnp.
most pnp output transistors are green.,but some are black,
so we must go by the numbers on the transistors, eg.A1076 is a pnp,B755 is a pnp and all transistors that have a C or D eg. D424 are NPN transistors. all A and B numbers are PNP and all C and D numbers are NPN.
MOSFET transistors have 3 pins 1)gate 2)drain 3)source
the source goes to power like the collector does. the drain is like the emitter,and the gate switches it on like the base does.
testing a mosfet is a different procedure.
a mosfet with k then a number e.g. k135 is a positive device like npn.
a mosfet with j and a number e.g. J50 is a negative device like pnp.
a mosfet reads open source to drain both directions.
for a positive (k number device) the plus meter lead goes on the source.,the black meter lead on the drain. on the diode test function.
jump a wire from the source to the gate for 1/2 second and remove the jumper while leaving the other two meter leads connected to the source and drain.The mosfet should switch on and the meter should show a short.that means the mosfet switched on.About 5 seconds later,the resistance from drain to source should go open.
for a p channel mosfet,it checks the same,except that the black meter lead goes on the source and gate .
a mosfet will stay switched on longer than the voltage applied to the gate,if it is driving a high impedance device such as a meter.
a bipolar transistor will not stay on when voltage is removed from the base lead.
i hope this has been of some help.

Sep 09, 2009 | Alesis RA-150 Amplifier

1 Answer

Same...


In a CRT type monitor/TV the push-pull transistors are used in the vertical output section to provide both poistive and negitive signal amplification. By using a NPN and PNP transistor set you can amplifiy a signal that goes positive and negitive. A NPN uses the positive portion of the input signal and then amplifies that signal (pushing it to a higher positive signal level)(PUSH). The negative portion of that same signal to sent to a PNP transistor to amplify the negative to a more negative value PULLing the signal lower/more negative). The out puts of both transistors are combined providing a PUSH-PULL transistor set.
Now days the use a chip with all the transistors and a lot of the associated components inside. The LCD I worked on used FET's N-type and P-type (negative and positive).
I hope this helps.

Jun 30, 2008 | HP Pavilion F1703 17" LCD Monitor

1 Answer

NAD C350


Take a ohm meter and measure resistance from emiter to collector should have a few kilo ohm on output transistor.
If no ohm meter available , remove output transistors from circuit.
note position of transistor . you have a NPN and a PNP for each channel.
Replace fuse and power up. If fuse blows check bridge in the power supply.

80% of the time output transistor burn and blow the fuse.
before replacing output transistors check driver transistors they probably burnt also

Apr 29, 2008 | NAD C350 2-Channel Amplifier

1 Answer

Hooking up 2 speakers to 1 speakon output


Power Output (1 kHz*) Stereo Bridge-Mono 8 Ohm 4 Ohm 8 Ohm XLS 802 500W 800W 1600W XLS 602 380W 600W 1200W XLS 402 300W 450W 900W XLS 202 200W 300W 600W *1 kHz Power: refers to maximum average power in watts at 1 kHz with 0.5% THD. It depends on the impedence of the speakers. Carfull as you could burn up this amp if you exceed the resistance rating on it. Go here on all of the specs of this model of crown amps. http://www.crownaudio.com/amp_htm/xlsspec.htm Good Luck

Mar 27, 2007 | Crown XLS202A 2-Channel Amplifier

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