Question about Harman Kardon AVR 25 MKII

1 Answer

Have a HK AVR20 Mk II. It powers on correctly, can listen to AM tuner reception ok [compare to Proton 440-same location/antennna[s]/etc] and also FM/Mono mode reception is good. But when I switch to Stereo mode the speakers go totally silent, no hiss-nothing, even at full volume. I purchased the tech/service manual from HK/Northridge CA, and have perused the schematics thoroughly, but to no avail. I am a semi-retired R&D lab engineer/64yrs old. I am fully competent in "electronese", it is a second nature to me. I just need a 'Heads-up" of where to begin, other than blindly dive in. Thank you in advance for your time and consideration to this matter. Sam

Posted by Anonymous on


1 Answer

David Dunn

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 8,546 Answers

Before you start with the scalpel are you sure the statons(s) are sufficiently strong to allow stereo tuning?

Page 18

Posted on Jul 18, 2011

  • Anonymous Jul 20, 2011

    Sorry for the slow response, had a prob with my FixYa login/pw--all correct now [great response on that]. On to business--the station I am using for test registers 5 bars on SS LEDs on my Proton 440 snaps into STEREO immediately and comes in on great audio [same antenna/etc]. Proof enough for me. The HK AVR20 does not light up the STEREO LED, in stereo mode [and sad it doesn't have a SS LED bar set], but works perfectly in mono. I am going to attempt an alignment [if possible], but only have a [very good], VOM / 60MHz DT scope / signal tracer. Found a HK bulletin [Service bulletin # 9601 -January 1996] and going to check that parameter [for FM center tuning alignment] in addition to what general alignment i can perform. Still think it is "something" simple, but haven't had the time to take the "lid" off/examine with loupe lens/light. The owner is a 45+ old "conservative" who is a co-worker I admire/respect--he says he hasn't even come close to even "accidental" abuse, and I believe him [me--33+yrs business management--great character judge]. So we shall see, and again, thank you for your [quick], response, any further ideas, do not hesitate--they will not go un-noticed.


  • Darren Dec 11, 2011

    I have the exact same problem! I added a powered antenna and when I turned it back on, nothing. I opened it up a checked all the fuses and they were alright. I disconnected everything and just used the speakers and still the problem persists. Have you found a solution?



Add Your Answer


Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How do I get antenna or air tuner mode

Assuming you have the remote control and the tv is not plugged into any other receiver the tv should be in standard reception mode. Ensure the reception /input mode is set to the protocal for tv broadcasts in your area, i.e. if your area receives digital broadcasts ensure the TV is set to digital reception rather than analog(ue), HDMI, USB, VDA etc. The adjustment should be available from one of the buttons on the remote control.
Assuming this is all set ok just initiate a full autoscan/ autotune and this should find all the local channels available to you.
Ensure your aerial/antenna is installed correctly and is functionaing correctly.

Oct 16, 2015 | Televison & Video

2 Answers

How do I hook an antenna to my tv

Hi Dwayne,

The Proton has an NTSC analog tuner and also an ATSC digital tuner. Have you tried switching or changing the SOURCE inputs?
You may also have to use the scan button to have the tuner "find" the channels for you once you determine that you have selected the correct source for the antenna.
See page 9 of the manual.

Jan 18, 2015 | Protron PLTV-4250 42 in. LCD Television

1 Answer

Could some one tell me how to change the stations on my WURLITZER -MODEL WR 18-1015-CD AM/FM- 18" TALL-LIGHT UP i have tried to and i can not get it to work. It only has a remote. Thank you

Here is a link to obtain the owner/user manual for that wurlitzer if you would like it:

1. Turn power on using either the remote or power button located behind tuner door.

2. Push CD / RADIO BUTTON (25) to enable FM tuner.

3. Turn FM dial to desired station.

4. Position FM ANTENNA (16) for best reception.

5. Set volume to desired listening level.


Sep 17, 2010 | Wurlitzer Crosley WR18 Mini-Bubbler CD...

1 Answer

Hello, I have a Minn Kota 440 4 Bank Charger. I recently heard it spark when I plugged into my 115V AC power source. Since then I have no charging light indicator and no actual charging occuring. I tried...

Hello Brad / Colee

The voltage converter in the charger has gone out (violently). Do not use this charger in your craft anymore. There is no longer any kind of guarantee of isolation, and galvanic corrosion may be accelerated if the boat is sitting in the water and you try to charge batteries.

Replace the charger. Your craft and your lives aren't worth the risk. You can try contacting Minn Kota to see if there might be some kind of warranty assistance.

Aug 29, 2010 | Garmin Minn Kota MK 440 On-Board Charger...

1 Answer

ONLY THE check connection light comes on. There is

I am having the same issue with My Mk 210 charger and have tried contacting Minn Kota two times for help? Have you had any luck finding the solution ?

Jul 27, 2010 | Garmin Minn Kota MK 440 On-Board Charger...

2 Answers

The FM tuner picks up only a few stations and those are very faint. Two other Proton model 320 radios work fine in the same area. I live on Long Island where the reception is rather strong.

The tuning module within the radio is getween the base circuit card and the display. A shot of tuner cleaner into one of the ports will usually bring back the FM performace (I just got done diong my own). Also, it goes without saying that you need to make sure your radio still has its antenna wire and that the vacuum didn't eat it. If this is beyond your skill level, find a computer geek (there are few radio geeks any more). Commercial repair would cost more than the value of the radio.

Jun 11, 2010 | Proton R5A Clock Radio

1 Answer

The phono works, but i get no sound when tuner on

This usually means that the tuner is not getting sufficient reception for the station you are trying to listen to.

Receivers come with cheap wire loop antennas try upgrading to a powered FM antenna available online or at your local Radio Shack.

Hope that helps

Feb 15, 2010 | Pioneer VSX-D903S Receiver

1 Answer

Harman Kardon AVR20 II Receiver Low Sound Level

This may sound silly, but please verify that the tape monitor switch in not engaged. The TST mode bypasses that section of the receiver. This is the most common cause. Since the TST signal is the correct volume, the output amp section is working correctly. One other possibility is the tone circuit having a problem, but lets verify the simple stuff first. I'll look up the tnoe circuit section in the meantime. Please update this when you can with your results.


Aug 28, 2008 | Audio Players & Recorders

1 Answer


Yes, actually there is a capacitor which is dry and needs replacement. Is located on the front panel board

Nov 22, 2007 | Harman Kardon AVR 130 Receiver

Not finding what you are looking for?
Audio Players & Recorders Logo


Ask a Question

Usually answered in minutes!

Top Harman Kardon Audio Players & Recorders Experts

The Knight
The Knight

Level 3 Expert

76584 Answers


Level 3 Expert

6746 Answers


Level 3 Expert

1997 Answers

Are you a Harman Kardon Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides