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HK 3485 in protect mode and right channel out

My HK 3485 unit went into protect mode and smoke billowed from the unit. It shut down and now the right channel does not work. What can be done to fix it? Or should I toss it?

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Posted on Jan 02, 2017

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SOURCE: HK AVR-247 protect mode

This is an indication of an internal problem. Typically this is shorted output transistors. Expect a parts cost in the $25-$40 range for this repair.

Dan

Posted on Apr 06, 2010

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dunnbiker
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SOURCE: Fiber Optic input

No gots. The 3485 is pre-digital stereo-only.

From the manual, page 19

"You may have observed that the HK 3485 is not equipped with digital audio inputs or surround sound decoding. If you prefer the complete home theater experience, you may wish to consider purchasing a fullfeatured Harman Kardon AVR Series audio/video receiver. However, we hope you will find that using a DVD player with the HK 3485 in smaller settings, such as a bedroom or den, surpasses the audio performance of most televisions, including those with onboard stereo speakers."

Posted on Apr 13, 2010

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1 Answer

My mtd yard machine (leaf blower) started billowing white smoke. I shut it off and now it won't start again.


First check the oil level. If its overfilled correct it. Then remove the spark plug and turn the engine over. Replace the spark plug.
Start the engine. Use a prime ( squirt carb cleaner into carb) if you need to. It may start smoking again. Thats OK as long as you know there is oil in it and you dont hear any strange noises. Let the unit run for about 5-10 minutes and see if the smoke clears up. Once it quits smoking stop it and check the oil.

Nov 11, 2012 | Garden

1 Answer

HK 3380 Receiver - Power turns ON, then within a few seconds displays a PROTECT mode and immediately shuts off. I have checked speaker leads for shorting, etc. This unit was operating perfectly and then...


It seems that one (or both) of the power amps are defective. To have a quick check, take a meter, sett it on the DC voltage and measure the outputs, one by one (with no speaker attached and no signal) for the short time when the unit stays on. If you have high DC voltage on the outputs (one or both) this means that channel(s) needs repairs (most likely the power transistors are blown). If one of the paired transistors is gone you need to replace both of them anyway.
Good lock
Kostiko

Sep 21, 2011 | Harman Kardon HK 3380 Receiver

1 Answer

HK 3370 turned into protection mode after pluging in a playing iphone. Happened more than one hour ago but hk3370's power light is still red. How do I get this thing out of the protection mode?


turn unit off using main power button, hold down t-mon and cd buttons at same time as switching main switch on should power up and show reset on the display for a short time then dhould go to standby this has reset unit and should now be ok

Jan 10, 2011 | Harman Kardon HK 3370 Receiver

1 Answer

My reciever went to protect mode after my speaker wires touched. I removed all cables and power for an hour but stays in protect mode. I also changed 2 15 amp fuses inside but nothing unless I take fuses...


Yes, you can do this easily.
Perform the following steps
(1)Plug your amp to AC outlet.
(2)Switch it on.
(3)observe time taken for switching off.
(4)immediate to shut down over current protect(5)3 seconds to shut down DC protect.
If over-current protect do the
following steps
(O)unplug the amp.
(1)download NR806 service manual.
(2)open the amp metal cover.
(3)measure 7 large white resistors resistance loacated next to power transistors mounted on a large heat sink with black probe touching the middle pin and red probe to first/left or third/right pin.
(4)If this 3 Pins large white colour 0.22ohm x 2 resistor is open with infinity ohms ,
(5)replace it and jot down this channel for example left surround faulty. Usually only 1 channel went faulty.
(6)the two large power transistors next to this white resistor 0.22 ohms x2 should also be replaced.
(7)plug the amp
(8)switch it on
(9)if ok, troubleshooting get done
(10)if not ok
(11)replace ALL the components of this power amp channel.
(12)pre-amp section no need to check.

Nov 23, 2017 | Onkyo TX-SR806 Receiver

1 Answer

Fiber Optic input


No gots. The 3485 is pre-digital stereo-only.

From the manual, page 19

"You may have observed that the HK 3485 is not equipped with digital audio inputs or surround sound decoding. If you prefer the complete home theater experience, you may wish to consider purchasing a fullfeatured Harman Kardon AVR Series audio/video receiver. However, we hope you will find that using a DVD player with the HK 3485 in smaller settings, such as a bedroom or den, surpasses the audio performance of most televisions, including those with onboard stereo speakers."

Apr 13, 2010 | Harman Kardon AVR 240 Receiver

2 Answers

Protection mode


The protect mode with nothing connected indicates that the output transistors for one or more channels are shorted. These will need to be checked and replaced. This is a simple repair for an experienced audio shop, Figure about $10 for each output transistor and add in another $10-$15 for misc parts that may also be smoked.

Dan

Mar 18, 2009 | Denon AVR-3600

1 Answer

Blowing smoke immediately prior to auto-shut-off


Try a new CAD falme sensor, or high limit control, both very cheap.

Jan 07, 2009 | Reddy R155D Utility Heater

4 Answers

Amp comes on and goes right into protection mode


Turn the reciever on for a second or two and then off before the protect mode shows up on the monitor. Repeat this step about five times and check to see if the reciever does not go into protect mode. If it does go into protect mode try it again. Dont know if this is the proper way to fix the reciever but it worked for me. Good Luck

Mar 09, 2008 | Audio Players & Recorders

1 Answer

Protect mode


have you ever been able to hear anything from this unit?

Jun 04, 2007 | Harman Kardon HK 3480 Receiver

1 Answer

Shutdown protection? HELP please


All of the Denon recievers I have repaired (over 100) that shut down after a very short time are going into protect mode. The display lights up and after about 10 seconds the display goes out and the standby led blinks red.
I have found that they have one of 3 possible problems and they all require that the reciever be taken apart and fixed at component level. No way to tell what your problem is until it gets put on a bench and troubleshot.

Problem 1. This is the most common problem. One of the front channels shorts out. On the big heat sink the front channels are at each end. It is the front left channel (close to the display) This requires that the output transistors be replaced as well as some driver transistors and some resistors and a capacitor. Lots of work for a blown channel. Denon has put out a bullitin to upgrade the bias transistor and change a couple of resistors to help compensate for this failure. That channel overheats more than any other channel.

Problem 2. There is a resistor that is right next to the preamp board that opens up. It is a 10 ohm 1 watt resistor and when it opens, it causes the unit to go into protect.

Problem 3. The +12 volt regulator fails. It is in the power supply area on a smal heat sink right next to the -12 volt regulator. Generic part number is KIA7812 It also causes the unit to go into protect.

Most decent repair shops can fix these from about $120 up to about $200. Depending on which problem it is and how fast they are at finding the problem. Most charge labor by the hour.

Sep 06, 2006 | Denon AVR-1603 Receiver

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