Harman Kardon AVR 7000

Raven79 · Guest

Hi!

Having problems with my avr 7000, left front channel has no sound, anyone here have a service manual to this amp? anyone know what the problem might be, and the solution to it?

Guest · Posted: Mon Sep 18, 2006 10:42 pm Post subject:

Hello
I know its a long time ago, but did you find out whats wrong with your reciver ?
I have a similar problem with mine, but it is on the right channel.
Could be the same problem...

BR Hans-olof

Anders · Guest

Hi,

I've been browsing around for resolution for this problem since yesterday; The "powerplant" seems to be well respected for it's sound qualities, by disrespected for it's poor quality.

The problem in low/no sound for different channels seem to originate from DSP capacitors that are worn out (due to high temperature).

People seem to recommend to replace all 10 uF capacitors on the DSP board, which judging from responses, seem to do the trick.

I'll order capacitors and try it out.

Service Manual is found on ESE (however three or four H/K folders)

Regards,
Anders

Anders · Guest

Hi,

Replaced the capacitors, and it seems to have worked fine. Verified sound in at least four channels. Will try out more at my brother in law's next weekend.

General low level on the amplifier; Requires to operate around -20dB -> -15dB to give sufficient level.

Anyone with experience from AVR7000 that can comment on how hi volume needs to be set? (configured for "small" front and rear speakers).

/Anders

Mo · Guest

Guest · Posted: Sun Jan 13, 2008 5:26 pm Post subject:

where did u find the capacitors and how much where they my AMP is down so no music fer me my email is [email protected] thanks if u could help me would be awsome

Srinath · Guest

Hello all,
I am loate to bring back a zombie thread, but well my amp turned into a zombie so I figured it was OK.

OK so the avr7000 works perfect in stereo mode but has issues in all the other modes. If you put it in any of the surround modes, it cuts 20 db off the right front speaker. headphones also act like something has shorted the internals out. It blinks HE, then back to the input and HE and back etc etc and no sound form the Headphones.

So I pull the amp apart. Video board comes off, and the DTS board comes out, and I see there are 4 caps that seem to have their tops welled up.

C65, C70, C73 and C170, and all 4 are in 1 segment it looks like - They are in the +3v3a (c65) , +3v3d (c70 and c73), and +5vd (c170) section of the circuit. I suspect they are filtering of some kind, cos their other leg is to ground. So I suspect its losing some charge to ground and hence not supplying power where it needs to go.

Could someone look at the avr 7000 schematic, its in the DD/DTS/HDCD/7-Logic board and let me know if I can experience these symptoms with the caps being out.

Hope this could help some others as well.
Thanks.
Srinath.

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

Certainly can cause all sorts of problems. Your listed caps are in 3.3V AND 5V lines & are all 1000mf6.3v electrolytics.---& there are more of them. If I were you I'd replace them all with at least a 10V cap.
Go to elektrotanya.com & dload the manual ver4 (pg143 of the pdf)

Srinath · Guest

I have the manual and have been looking @ it till I turned blue ...

OK all them caps 10v 1000mf ? Find and swap all of the 6.3/1000 ... or all the 6.3's regardless of their mf ... and on other boards ?

Thanks so much.
Srinath.

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

What I meant was to change the working voltage> 6.3v rating to 10v rating.
No need to change the capacitance value.
In the world of consumer electronics, 6.3volt caps are problematic.
Their use is strictly a cost issue. When you have a 5 volt line and decide on using a 6.3V cap, you are very close to the capacitor limit. Not counting any other issues.