Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Chip Amps Amplifiers based on integrated circuits

chip amp inside z560
chip amp inside z560
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 9th April 2007, 06:08 PM   #1
braden is offline braden  Canada
diyAudio Member
braden's Avatar
Join Date: Jan 2007
Location: Ontario
Default chip amp inside z560

Hello Everyone.

I was listening to some Grandfunk when my left front channel just cut out. I tried using different speakers on that channel and no luck. All my sats work fine, just the one channel is gone.

So what I've done is completely disassembled the entire unit, all the sats, the subwoofer, and laid all the parts out on my workbench and cleaned everything from dust and whatnot.

What I was thinking of doing was removing the rear channel amplifier chip and putting it in place of the front channel IC that is blown. I haven't disassembled the actual plate amplifier yet, as I'm not too sure I want to go there without the proper knowledge.

Basically I'd like to convert this 4.1 plate amp into a 2.1, and move the rear two speakers into a new box that I would make, that would house two Tang Band drivers each.

Does anyone have any information pertaining to which of the ICs I would have to desolder and solder in place of the front channel?

here are some pictures of what I've pulled apart.
  Reply With Quote
Old 9th April 2007, 10:46 PM   #2
jaycee is online now jaycee  United Kingdom
diyAudio Member
Join Date: Apr 2004
Location: Norwich, UK
Logitech love to use ST chips. Which chips is this one using?

At a guess from the pics they will be using two chips that are stereo... and two chips that are mono in bridge mode to drive the sub.. but thats just a total guess.
  Reply With Quote
Old 11th April 2007, 06:23 AM   #3
space is offline space  Norway
diyAudio Member
Join Date: Jan 2004
Location: Oslo - Norway
I think I've read about it before. If my memory serves me well, it uses TDA7293 chips. One for each ch except sub which uses 2.

From time to time there are some of these chips on ebay. (2 pcs. a.t.m. when wrighting this)

I guess the 4 chips in one end of the amp plate is the four channels and the two on the other end is for the bass.

To figure out which of the four channels is which, you probably need to do some measurements.

  Reply With Quote
Old 11th April 2007, 11:49 AM   #4
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
download the datasheet for the TDA and compare it to your examples.

Can you read the labelling hidden under the securing clip?

Have you identified which on is dead?
regards Andrew T.
  Reply With Quote
Old 12th April 2007, 03:41 AM   #5
braden is offline braden  Canada
diyAudio Member
braden's Avatar
Join Date: Jan 2007
Location: Ontario
I got off work (consisted of building dirt jumps with a local crew, volunteer work more or less) ... and went straight to disassembling the z560's amp.

I had the hardest trouble with the long plastic studs that help up the PCB board. They were hollow and had a 4" (roughly) long machine screw through them with the head hidden beneath the heatsink. the nut on the other end was exposed and easily accessible on the top of the PCB, but they used some type of wax/threadlock thats impossible to get off. I cheated and heated the nut up with a soldering gun, and went at it with a 7/32" socket and they came off like butter.

Anyway.. I took it all apart and discovered FOUR TDA7293 on one side of the heatsink (I assume those are for the FOUR sats ...) and on the other side of the heatsink was only TWO TDA7293. Beneath TDA7293 on all the chips was R880K0220 I'm not sure what that implies.

On for each of the FOUR TDA7293 (for the sats) were TWO capacitors rated @ 220microferrad, for a total of eight on that side.

For the subwoofers, each TDA7293 had TWO 1000microferrad capacitors. and the who board seemed to be powered by two massive 10,000microferrad capacitors. All capacitors were made by the brand name Chang.

I haven't located which one was damaged as of yet, but I'm narrowing it down to one of the FOUR on the one side of the amp, you'll see in the pictures. None of them look damaged, or burnt, or anything, they all look pretty clean, except for the thermal paste smeared all over them.

I really appreciate your help. If you would like any more information please ask me anything I am willing to do anything to get this to work as a 2.1 setup.

My good friend just bought a set of Mackie SR1530's on eBay, and he's giving me his set of z560's that still work perfectly with no problems. So now I have a backup set I can reference.

ohhhh here are the pictures i almost forgot.

Click the image to open in full size.

**check out the notes section for various notes

ps: about my bike, here is a picture of a new fork I just got for the season.

Click the image to open in full size.

Once again, thank you for taking the time to read this.


  Reply With Quote
Old 12th April 2007, 05:47 AM   #6
jleaman is offline jleaman  Belgium
Join Date: Apr 2002
Send a message via AIM to jleaman
Lots of little green caps, should research there values and replace them with better ones, Looks to be lots of active x-overs per channel too.

  Reply With Quote
Old 12th April 2007, 06:59 AM   #7
space is offline space  Norway
diyAudio Member
Join Date: Jan 2004
Location: Oslo - Norway
First thing I would do is check the 4 IC's to see if one really is broken. (Maby there is a faulty/broken wire somewhere.) Measure output on all with and without inputsignal. Check for DC when testing with no input. Check AC at output with a constant AC input. (Best to connect a AC input directly on the IC input.) Remember to have some kind of heatsinking on IC's. (Fast turn on/off will probably be ok without heatsink. (TDA7293 have overtemp safety shutdown.)

  Reply With Quote


chip amp inside z560Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Can I use a logitech Z560 amp/sub with different speakers? cerupcat Multi-Way 3 13th November 2007 10:25 PM
what do you think about this amp? (pic inside) audioholik Solid State 9 17th November 2006 10:50 AM
Help needed troubleshootiung Logitech Z560 subwoofer amp DcibeL Solid State 15 25th November 2004 06:35 AM
LMxxxx chip as a buffer inside feedback loop? 300_baud Chip Amps 3 12th November 2004 06:08 PM

New To Site? Need Help?

All times are GMT. The time now is 06:17 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio