AQ 2200 - Page 4 - 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 20th January 2013, 07:44 PM   #31
diyAudio Member
 
Deadly Sones's Avatar
 
Join Date: Feb 2011
Location: Windsor, Ontario
lol, thanks. I figured it out afterward. Sawtooth looks fine. So what next? If I ground pin 4, pin 1 will still drive it to shut down right? Wish I could figure out why pin 1's high.... I realize that pin 3 of the comparator is causing it, but I can't seem to figure out why...
  Reply With Quote
Old 20th January 2013, 08:19 PM   #32
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Connect a jumper between pins 4 and 14 of the ka7500. Does it still go into protect. Does pin 1 ever go above a fraction of a volt?
  Reply With Quote
Old 20th January 2013, 08:50 PM   #33
diyAudio Member
 
Deadly Sones's Avatar
 
Join Date: Feb 2011
Location: Windsor, Ontario
Connected a jumper from 4 to 14. Did not come out of protect and the voltage on pin 1 remained the same 6v.

Last edited by Deadly Sones; 20th January 2013 at 08:54 PM.
  Reply With Quote
Old 20th January 2013, 08:54 PM   #34
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
What is the DC voltage measured directly across R4A and R29B?
  Reply With Quote
Old 20th January 2013, 08:55 PM   #35
diyAudio Member
 
Deadly Sones's Avatar
 
Join Date: Feb 2011
Location: Windsor, Ontario
With or without the jumper? Without the jumper both have 0vdc across the resistors. If I measure from one to the other I get 9.5vdc. If I hold the leads there, voltage slowly drops. It dropped down to 5.5v before my arms got tired, lol

I did check them earlier for resistance. They are both good. R4A = 46.9K (47K) and R29B = 4.69K (4.7k)

Last edited by Deadly Sones; 20th January 2013 at 09:21 PM.
  Reply With Quote
Old 20th January 2013, 11:17 PM   #36
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Check them with the jumper in place and also confirm that the voltage on pin 3 is still higher than on pin 2 on IC2.
  Reply With Quote
Old 21st January 2013, 12:05 AM   #37
diyAudio Member
 
Deadly Sones's Avatar
 
Join Date: Feb 2011
Location: Windsor, Ontario
Both R4A and R29B have approx. 0.020v across them with the jumper installed.

The Pin 2 on IC 2 is still 2.473v, pin 3 was 3v and again as I hold the lead on the pin it slowly drains until it hits pin 2 voltage. Then it jumps down to 2.23v, then flashes to 2.34v, then jumps back to 2.49 and slowly goes back down to 2.42 and back to 2.49 over and over. IF I leave the lead off the pin for awhile and then reattach it, it shows that the voltage slowly rises on its own to over 3v again (depending on how long its powered up and the pin is not connected to ground through the meter).
  Reply With Quote
Old 21st January 2013, 12:10 AM   #38
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Remove IC2. Leave the jumper in place between pins 4 and 14 on the 7500. Post the voltage on all of the pads for IC2.
  Reply With Quote
Old 21st January 2013, 12:13 AM   #39
diyAudio Member
 
Deadly Sones's Avatar
 
Join Date: Feb 2011
Location: Windsor, Ontario
K, will do... to be continued tomorrow after work. Thanks Perry.
  Reply With Quote
Old 26th January 2013, 06:21 PM   #40
diyAudio Member
 
Deadly Sones's Avatar
 
Join Date: Feb 2011
Location: Windsor, Ontario
OK! I have the following readings with IC2 removed and the jumper from pin 4 to pin 14.

Pad 1: 8.42v (high?)
Pad 2: 2.473v
Pad 3: 0.028v (not fluctuating like it was, but every time I check it, keeps climbing. .058v, .090v, .126v, .151 right now - about 15 min powered up with no IC2)
Pad 4: 0.000v
Pad 5: 1.233v
Pad 6: 3.270v
Pad 7: 8.41v (high?)
Pad 8: 12.5v

For easy comparison... my old readings with IC2 installed were:

IL393
Pin 1: 6.60 (high)
Pin 2: 2.473
Pin 3: Started out @ 4+v and as I held the lead on it, the voltage slowly went down to 2.43v (lower than pin 2) then will jump up above to around 2.6or 2.7v then slowly go back down over and over. climb and drop, climb and drop. Whats up with this?
Pin 4: 0.00v
Pin 5: 1.025v
Pin 6: 3.096v
Pin 7: 0.118v (low?)
Pin 8: 12.64v

So basically Pin/pad 1 went even higher and pad 7 went from low to just as high as pin 1??? and pin/pad 3 dropped drastically. I just checked the voltage on pad 3 again, now its up to 0.370v and if I hold the lead on it, it does start to drain down the voltage...

Last edited by Deadly Sones; 26th January 2013 at 06:51 PM.
  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
ASL AQ 1002 PP KT88 problem with input stage limono Tubes / Valves 9 17th January 2014 05:12 PM
FS : Antique Sound Labs AQ-1003 PCB for DIY (INTEGRATED AMP EL34 PP) ANALOG GUY Swap Meet 7 21st April 2012 12:23 AM
AQ -1200 mike49504 Car Audio 44 30th September 2010 12:57 AM
2200 uf 6.3 v Black gate for 2200 uf 16 vdc max29 Analog Line Level 7 7th November 2007 08:51 AM
Antique SoundLab AQ-1003 cfamily Car Audio 1 15th July 2006 02:27 AM


New To Site? Need Help?

All times are GMT. The time now is 04:16 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