ZX750.1 up in flames. - Page 6 - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

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
Reply
 
Thread Tools Search this Thread
Old 7th August 2013, 10:59 PM   #51
diyAudio Member
 
Join Date: Jan 2013
Location: Flint, Michigan
Ok I went over the board with a magnified lamp and the only thing I found was a possible bad connection on a blue rectangle close to 4 capacitors marked 105K100, I resoldered it, should I put the rectifiers back in and try it or should I wait. My dad mentioned my grandfather had an old scope in the basement would that possibly work? Im not sure how old it may be.
  Reply With Quote
Old 7th August 2013, 11:55 PM   #52
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Post a photo of the component that had the bad solder connections.

Old scopes are OK as long as they have a triggered sweep. What make/model is it?
  Reply With Quote
Old 8th August 2013, 12:14 AM   #53
diyAudio Member
 
Join Date: Jan 2013
Location: Flint, Michigan
Default amp pic

Ok heres a pic of the component. Its the little blue rectangle.

As far as the scope goes Ill try to get more info.
Attached Images
File Type: jpg IMAG0168.jpg (450.2 KB, 26 views)
  Reply With Quote
Old 8th August 2013, 06:43 PM   #54
diyAudio Member
 
Join Date: Jan 2013
Location: Flint, Michigan
The scope I have access to is an old tube type scope so Im not sure it will be what I need. What would the scope allow us to do?
Would this type of scope allow us to do what I need? Ebay item 271252997929, its a Tektronix 475.
  Reply With Quote
Old 8th August 2013, 07:41 PM   #55
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Post a photo of the front panel of the scope you have after confirming that it works.

That scope would do everything that you'd need for most all repairs. Do a completed item search to see what they sell for. I'd expect it to sell for over $200.

As a side note, that's a TAS475. It's much different than the older 475.
  Reply With Quote
Old 8th August 2013, 10:43 PM   #56
diyAudio Member
 
Join Date: Jan 2013
Location: Flint, Michigan
Ok heres a pic of the ole Jackson scope. This thing is older than me i do believe.

Im gonna place a bid on the TAS475 but it sells for around 300-400 so i dont believe my bid will be enough but ill try.
Attached Images
File Type: jpg IMAG0169.jpg (898.8 KB, 21 views)
  Reply With Quote
Old 8th August 2013, 11:34 PM   #57
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I doubt that that would be usable.

Reinstall the rectifiers and remove all of the output transistors. After removing the outputs, make sure that there are no solder bridges between any of the pads.

Will it power up without the power supply FETs heating up?
  Reply With Quote
Old 9th August 2013, 04:06 AM   #58
diyAudio Member
 
Join Date: Jan 2013
Location: Flint, Michigan
Ok I installed the rectifiers and removed the outputs and lo and behold 2 shorted outputs, How did I miss that? Is it because I checked them in circuit? or did I make a rookie mistake?

I lost the bid on the scope, Im still on the hunt, is there anything specific I should be looking in for a scope?
  Reply With Quote
Old 9th August 2013, 04:27 AM   #59
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Did you check them properly? If you don't discharge the gate/source, they may appear shorted. The following page has a section for testing FETs:
Basic Amplifier Repair - Transistor Test Applet Link

A simple analog scope is all you need. Either post auction numbers or email me directly. The used BK Precision 2120B scopes go for about $150 and at that price, they're a good deal.
  Reply With Quote
Old 9th August 2013, 07:47 PM   #60
diyAudio Member
 
Join Date: Jan 2013
Location: Flint, Michigan
All three pins of one irf9640 and one irf640 and a dead short. Boards all cleaned up ready to go. Now on to the KX2500 with the same problem.

Ill purchase a scope when payday comes, I plan on repairing more amps, I figure after repairing a few that I should start progressing in the troubleshooting department.
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need schematic for kicker zx750.1 no1stunna Car Audio 19 11th January 2012 04:10 PM
Need help with zx750.1 with no sound kylelemay1 Class D 3 11th May 2011 11:34 PM
Kicker zx750.1 texasrebel1 Car Audio 2 10th January 2009 04:46 PM
Kicker zx750.1 solobaric 10's texasrebel1 Car Audio 2 5th December 2008 01:27 AM
I'm going down in flames amc32 Car Audio 13 11th July 2008 04:18 PM


New To Site? Need Help?

All times are GMT. The time now is 03:41 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2