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My pioneer sx-1900 wont turn on,fuses and switch are ok and have read that it MIGHT be the output transistors but dont know what or where they are so i can source and replace them,problem is i cant get hold of manuals/diagrams to carry out the repairs. PLEASE help me,i am not an electronics tech but work on EFI cars day in day out so have a BASIC knowledge of electronic diagnosis/repair. thanking you Tim Baldwin

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  • 883 Answers

SOURCE: Protect message when I turn on the receiver

call 800-488-7669 for tech support

Posted on May 27, 2007


SOURCE: onkyo tx-sv535

you tried reset on front panel? you hold down video 1 and then also press power off. the panel says "clear", then start up again.

Posted on Feb 08, 2008

  • 3 Answers

SOURCE: COBY TFDVD5605 Portable DVD Player repair tips

all potable dvd player work on 9V through cig lighter in your car adopters comes in three diffrent sizes.

Posted on Jul 20, 2008

ysastek
  • 28 Answers

SOURCE: MOTHERBOARD REPAIR

First off, is the motherboard actually the problem? If your motherboard has failed, the screen may come on and you may have some sort of raster (brightness) but thats as far as you get. Power supply failure is (in my experience) more common than mother board failures (usually) and may exhibit the same symtoms. Also a bad battery on the motherboard will cause funky things to happen on boot. (clock not right/failure to recgonize hard drives, etc). If you are certain a motherboard is a fault you should replace it ( unless you are VERY fluent in soldering/desoldering surface mounted components and component level repair and have a solid understaning of digital and D.C. circuits) More often than not, replacing the entier motherboard is cheaper and less of a hassle.

Posted on Sep 13, 2008

  • 1 Answer

SOURCE: NAD 7155 with one speaker channel not working

In my case, if I push in on the balance knob, I can get the channel that quits to work for a while.
This leads me to believe that the pot is dirty as opposed to a circuit or component failure.
A couple of years ago, I sprayed circuit cleaner into the pot as best I could and the problem disappeared but, it has returned.
My next attempt will be with one of the newer cleaner/lubricators that are available now.
I don't know if this will solve your problem but, it might be worth a try.
BTW, getting access to the volume/balance pots takes some doing. As long as you are there treat both pots.
Greydog(1)
G

Posted on Sep 22, 2008

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1 Answer

Blowing fuse


Your output transistors are shorted and need to be looked at by a tech.

Apr 04, 2014 | Pioneer SX-205 Receiver

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Pioneer sx315 receiver shut off after being cranked up for a while and wont turn back on checked fuse its good. power button seems to work clicks when turned on and off


If the power to the outlet is still good, then I would suspect the power amp IC or output transistors are shorted, keeping the power from coming on. It's also possible that one or more of your speakers are bad feeding back to the receivers output connectors, especially if you were running speakers with a different power rating or impedance that your set is designed for. Hope this helps.

Jul 10, 2011 | Pioneer SX-315

1 Answer

My sub woofer wont work? the stereo turn on then it shuts back off.


hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If then also it shows protect you have to check the amplifiers hardware.

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally AV receivers show this when any of the output amplifier get some problem. there are six amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
for that you need digital multimeter,soledring iron screwdrivers etc
open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
ok

Mar 08, 2011 | Pioneer SX-315

1 Answer

Pioneer SX-2300 powers up, but no sound.


Does the output relay click about 5 sec. after powering on? If it does check if the tape2/tape monitor is on. Check speakers and wiring. Try headphones.

There aren't any fuses for the output.

If no relay then it probably needs output transistors and a few resistors.

Dec 17, 2009 | Audio Players & Recorders

1 Answer

My sx 950 wont turn on the lights wont work could it be a fuse?


Yes, check the incoming fuses over by the main power transformer first.
If the fuses are good, the next check will be power switch and then transformer itself.

Jul 25, 2009 | Pioneer Audio Players & Recorders

1 Answer

The transistor of my pioneer sx-203.i remove my power transistor so that i can replace but it lost...i dont know the code of the power transistor or the main transistor.


Tell me the board no or exactly where it is located or there will be a number like T XX for denoting the sequence no of that transistor

i have a good one working now with me
if you have users manual please send for me
Dennis

Apr 26, 2009 | Pioneer Audio Players & Recorders

2 Answers

Pioneer SX-9000 Receiver Nothing out of the left channel no sound


Could be as simple as a bad connection at one of the regulators or as complex as a blown channel. These are good units that are worth the repair cost. Where are you located?

Dan

Jan 30, 2009 | Pioneer SX-205 Receiver

5 Answers

Pioneer SX-750 Old School Need Help


It could be a dirty control or switch, working them back and forth could prove that. Other than that, It's likely bad outputs. A unit that old may have transistors for outputs but might be IC's. Transistors can be tested with an ohm meter to see if they're good or not. Also if it has transistor outputs, they may have a small value resistor on the Emitters, check those as well.

Hope that helps...

Geno

Mar 07, 2008 | Audio Players & Recorders

4 Answers

Pioneer SX-203


a little bit foolish thing: see if you have both the speaker channels (A and B) down. if you have both down it doesn't work - didn't for me.. and obviously make sure you have the right letter down - same outpout as your boxes

Dec 06, 2007 | Pioneer SX-205 Receiver

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