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HARMIN KARDON HK6800 BLOWS MAIN FUSE AND POWER TRANSISTORS ON THE OUTPUT CHANNELL

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6 Suggested Answers

SOURCE: Reads PROTECT on the display of my Onkyo TX-SV525 ???

HOWDY,         NOW YOU COULD TRY THIS ONE: POWER THE RECEIVER UP , THEN PUSH&HOLD !THE VIDEO 1 BUTTON, THEN TURN THE PIECE IN THE OFF (STANDBY MODE ) ,IT WILL SAY "CLEAR SO IT SHOULD BE BACK TO IT,S ORIGINAL FACTORY SPECIFICATION,S.

SUCCES !                              AMSTERDAMCOWBOY-HOLLAND-NOW FLORIDA! 4-EVER

Posted on Oct 23, 2007

  • 336 Answers

SOURCE: blows bothe fuses on power supply bd. b- shorted

The transistors you need are 2SD2560 and 2SB1647. (either you miss-read the D for a B or it was a typo) You can get them at: www.mcmelectronic.com
2S is a prefix on all Japanese transistors.
The 010 is a date code

Also check for open resistors from the base of those transistors and the dual emitter resistor (large white three leg resistor .22ohm)

Posted on Mar 01, 2009

Grubhead
  • 4585 Answers

SOURCE: AVR2106 blown channel parts list

Though any transistor(s) might well have gone and the capacitor could be changed, I see no reason to change any resistor unless it's burnt up or giving an incorrect resistance reading. A multi-meter will tell you if a resistor is working or not, if it's not dead or weak it won't make a lot of difference to the circuit, but replacing it will simply cost you more money!

Posted on Apr 05, 2010

bobhifi
  • 635 Answers

SOURCE: I have a Pioneer VSX-305 receiver. I blew channel

There are independent relays for the speaker A and B switching.Best place to start would be from the relay. When you select A do you hear a click, if not relay is not switching. The circuit involved is a small transistor , a low value resistor ( could be the culprit ) and a shunt diode.

Posted on Aug 16, 2011

Testimonial: "Thanks. I knew there had to be something like this. I'll follow your advice."

palaboy
  • 5807 Answers

SOURCE: i will replace the shorted

as long as it is properly insulated , or use a fuse holder

use no more than 5A

Posted on Aug 15, 2012

sg1972
  • 225 Answers

SOURCE: Harman Kardon AVR 7500 Does not power up and can't find fuses!!!

Honestly, if you are talking about the speaker protection relay, the relay and associated circuits rarely go bad but instead respond to problems elsewhere in the amp. Anything from defective speakers, bad spkr. wiring to output transistors will cause this protection relay to not energize thus protecting the output stages and speakers.

Posted on Feb 21, 2013

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1 Answer

SONY RECEIVER MODEL STR - D315 keeps blowing a fuse


When the main fuse blows on a sony, it is usually caused by shorted output transistors. You would have to replace these transistors before the unit will not blow the fuse and power up correctly.

May 23, 2013 | Audio & Video Receivers

1 Answer

Harman Kardon AVR 7500 Does not power up and can't find fuses!!!


Honestly, if you are talking about the speaker protection relay, the relay and associated circuits rarely go bad but instead respond to problems elsewhere in the amp. Anything from defective speakers, bad spkr. wiring to output transistors will cause this protection relay to not energize thus protecting the output stages and speakers.

Feb 20, 2013 | Audio & Video Receivers

1 Answer

Harman Kardon receiver in protect mode. Removed all contections and done reset ... still same issue


hi,

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Noramlly 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

Feb 12, 2011 | Harman Kardon AVR 35 Receiver

1 Answer

Blows fuse when turned on?


You either have a shorted output transistor on the left or right channel or the voltage regulator in the power supply is shorted. It will continue to blow fuses until the part is replaced.

Jan 25, 2011 | Harman Kardon AVR 100

2 Answers

Yamaha AX 550 amp blows fuse when power switched on,


Generally speaking, an amp protects itself from heat, shorts and overloads.

Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.

Jan 17, 2011 | Audio & Video Receivers

1 Answer

L/ front audio out not working fully. pre amp channell working & headphone L/front working. Can you advise


The left channel output in the amplifier stage is going out - could be a cold solder connection due to overheating. Check the left channel output of the power transistors solder trace - you can compare them to the right channel stage because they're almost identical circuits.

Nov 04, 2010 | Harman Kardon AVR 7000

1 Answer

Center channel is not working . Surround sound from center channel not working. I have found two fuses blown and replaced . when unit turned back on o try they blew again


First make sure the centre speaker is not shorted, try a different speaker and new fuses. If this fails and you have electronics knowledge here is the link to the service manual...
http://www.enusbaum.com/blog/tag/service-manual/
The driver or power output device (FET or Transistor) is probably shorted if the speaker is not shorted.

Jun 10, 2009 | Harman Kardon AVR 135 Receiver

1 Answer

Peavey 1200 Amplifier


Some of the outputs transistors is bad hence causing a bridge in circuit,thats why the fuse is blowing.Check all the outputs transistors on both channels,rectifiers and zena diodes these are the possible causes of circuit bridge when they are faulty.The fan works on AC thats why it is not affected even when the fuse is blown.Please if you have anymore challenge please send me a mail on mikewee4wee@yahoo.com

Aug 14, 2008 | Audio & Video Receivers

1 Answer

Power up problem


try powering the unit right down by disconnecting from the mains supply. fire up after 5 mins and see what happens. There is a separate transfomer for the standby supply(small red light) An internal fuse may have failed or the thermal fuse inside the transformer. If fuses blow as sson as you fire up = output transistors hay be short circuit.

Dec 07, 2007 | Onkyo TX-8511 Receiver

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