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

Memphis 16-ST1000D
Memphis 16-ST1000D
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 11th November 2019, 01:09 AM   #1
spooney is offline spooney  United States
diyAudio Member
 
Join Date: Dec 2006
Default Memphis 16-ST1000D

This amp has had quite the power supply blowout. The driver transistors (Q15 and Q16) on the power supply driver card were burnt beyond recognition. Does anyone happen to know what these transistors are or maybe an upgrade/sub for them? Are there any other components on the driver card I should be concerned about? Power supply fets and gate resistors will be replaced with IRF3205ís and 22 ohm gates respectively.
  Reply With Quote
Old 11th November 2019, 01:13 AM   #2
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I use BD140s. The originals was 2SA1266s.

Install the transistors standing far enough off of the board so you can solder top and bottom.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 11th November 2019, 01:18 AM   #3
spooney is offline spooney  United States
diyAudio Member
 
Join Date: Dec 2006
Thank you for the super fast response Perry. That is great news. I just happen to already have those parts on hand.
  Reply With Quote
Old 12th November 2019, 10:07 PM   #4
spooney is offline spooney  United States
diyAudio Member
 
Join Date: Dec 2006
Is there a way I can verify the power supply driver card is working without placing any fets in the power supply? Or will I need at least one fet per bank to get it to startup?
  Reply With Quote
Old 12th November 2019, 10:38 PM   #5
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
You can look at the waveforms on the gate pads. Load each location with a 0.047uF or similar cap (gate to source) to confirm that the drive circuits are as they should be.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 12th November 2019, 10:47 PM   #6
spooney is offline spooney  United States
diyAudio Member
 
Join Date: Dec 2006
While awaiting a response I tried one fet and gate resistor in each bank and it did not start up. Im not sure if I have the caps on hand to try one at each fet location. Do you think it is advisable to try loading something like irfz44n’s into the amp to see if it will start up? I have those in loads but not enough 3205’s at the moment
  Reply With Quote
Old 12th November 2019, 10:53 PM   #7
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
What do you mean that it did not start?

Did the 494 have life? Oscillation, drive pulses, 5v out...?
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 12th November 2019, 11:01 PM   #8
spooney is offline spooney  United States
diyAudio Member
 
Join Date: Dec 2006
I did not see any waveforms on the gate pads of the power supply fets I put in each bank. There was voltage on various pins of the 494 but I am not familiar enough with it’s operation to know what voltage/signal I should be seeing in each pin other than VCC and GND. Shall I start with posting voltages on each of the pins of the tl494?
  Reply With Quote
Old 12th November 2019, 11:35 PM   #9
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
On pin 5, you should have a sawtooth waveform. On pin 14, you should have 5v. On pins 9 and 10, you should have drive pulses.
__________________
Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
  Reply With Quote
Old 13th November 2019, 12:04 AM   #10
spooney is offline spooney  United States
diyAudio Member
 
Join Date: Dec 2006
I was not able to see any waveforms on pin 5 or drive pulses on pins 9 and 10.

Here are the DC Voltages of the TL494CN

1. 0 volts
2. 4.86 volts
3. 0.04 volts
4. 1.02 volts
5. 0 volts
6. 3.54 volts
7. 0 volts
8. 13.93 volts
9. 0 volts
10. 0 volts
11. 13.93 volts
12. 13.93 volts
13. 4.86 volts
14. 4.86 volts
15. 4.86 volts
16. 0 volts
  Reply With Quote

Reply


Memphis 16-ST1000DHide 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
Memphis 16-ST1000D mbates14 Car Audio 9 21st February 2014 05:17 PM
Memphis 16-st1000d Componentr Car Audio 13 8th October 2012 03:01 AM
Memphis 16-ST1000D Dr Zeus Car Audio 24 16th April 2011 04:53 AM
Memphis 16-ST1000D Question spooney Car Audio 4 29th December 2010 07:19 PM
Memphis 16-st1000d mike49504 Car Audio 46 19th May 2010 08:40 AM


New To Site? Need Help?

All times are GMT. The time now is 05:57 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki