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

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5 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

SOURCE: amp blows fuses

The fuses are there to protect the internals of the AMP.....
Please check that the correct fuses are installed......
if the incorrect ones are installed then a fire may develope...

There should be a manufacturers lable on the external chassis that details the fuses to use....

Fuses now days can be slow blow or fast blow....so the correct fuses must be used.....dont increase the fuse rating past the chassis panel label...but make sure they are correct...if they are correct then the amp needs a service to determine where the peak loadings to the power supply are originating from...

Some one may have installed incorrect fuses in the past...

Cheers from YUBEUT


Posted on Nov 03, 2007

  • 631 Answers

SOURCE: Have a a7 Hc... Blown transistors.. Shematic diagram??

What are the part numbers on the transistors you replaced?

Did you replace transistors in the output section and the power supply section?

Does this amp have the defaced ICs labeled B52 and F16?

Posted on Jun 23, 2008

  • 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
  • 4804 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

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Hi my adcom 5802 get right Chanal not working . I don't know why every time I put 2 fuse for that Chanel is burn st thing look like diot ... And after that 2 fuse burn too


If I can read you right you are saying that the device keeps blowing the fuse?

Fuses blow when there is an overload. As it is an amplifier we are dealing with the cause is more than likely a shorted output transistor or more than one, or whatever does the main amplification for the device. These devices are located on the main power amp board attached to a heat sink. If the amp has fuses for each channel then you only need to replace the devices on that channel, with the fuses blowing on it. The cause of shorted devices is often bad speaker wires or them touching.

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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.

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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

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1 Answer

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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.

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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.

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The cheapest option is to replace the transistors (a quick check on google will tell you how much they are). If they are common transistors you will be able to find them and get them quicker then searching for a board that could be no longer being made.

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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

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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

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Check fuses mounted near transformer . If blown check output transistor. Also check transistor transistors on small heat sink . they will cause fuse to blow.

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