Soundstream Rubicon 502 Repair Problem - 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 8th January 2010, 08:39 PM   #1
diyAudio Member
 
Join Date: Jan 2010
Location: NC
Default Soundstream Rubicon 502 Repair Problem

Been trying to figure out whats wrong with a Rubicon 502 board. The board will not power up, none of the leds will light up, no output. The board doesn't have any burnt marks other than some blackish around the bottoms rectifiers(?). Tested each outer legs to:
330k
467k

Any ideas on where to look. Please describe ideas, still in the learning curve.

Pics of the board and attached the schematic.
Click the image to open in full size.
Click the image to open in full size.
Attached Files
File Type: pdf r502_5 (3).pdf (134.1 KB, 35 views)
  Reply With Quote
Old 8th January 2010, 09:12 PM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Clamp the transistors tightly to the heatsink and insert a 10 amp fuse in the B+ line.

Power the amp up and post the voltage on all 16 pins of the SG3524.

SG3524
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 15:
Pin 16:
  Reply With Quote
Old 9th January 2010, 05:09 PM   #3
diyAudio Member
 
Join Date: Dec 2005
Location: Northern California
Here is a little more detailed info on your troubles, just trying to be helpful...

Q68 is a MPSW51A and it supplies the 12 volts to the LM3524 PWM control chip.

Q69 is a MPS8099 and it is the turn on transistor for the amp, thus it gets the 12 turn on through this transistor to the PWM supply.

TS1 and TS2 are temperature switches and they can inhibit turn on if they are dysfunctional...

This info plus what Perry has asked for should get you started on your quest...
  Reply With Quote
Old 12th January 2010, 12:33 AM   #4
diyAudio Member
 
Join Date: Jan 2010
Location: NC
NP any help is welcome.

I didn't have much luck in tracing the out the pins. If I'm right then..

Pin 1: 0.00
Pin 2: 2.74
Pin 6: 3.24
Pin 7: 2.21
Pin 10: 0.00
Pin 14: 0.00
Pin 16: 4.92

I did measure each pin with the amp facing in front of you, top pins from left to right:
4.92, 11.35, 0.00, 11.35, 11.35, 0.00, 0.02, 0.18

Bottom pins from left to right:
.002, 2.74, 0.28, 0.00, 0.00, 3.24, 2.22, 0.00
  Reply With Quote
Old 12th January 2010, 01:37 AM   #5
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Pin 9 needs to go higher for the IC to produce output. From the input voltages, it appears that something external is pulling it down. Remove and check D18. C57 may be leaking (electrically) which could pull it down.

With D18 out if the circuit, all transistors clamped tightly to the heatsink and a 10 amp fuse in the B+ line, power up the amp. Does it produce rail voltage with D18 out of the circuit?
  Reply With Quote
Old 14th January 2010, 06:13 PM   #6
diyAudio Member
 
Join Date: Jan 2010
Location: NC
Pulled D18 and the amp did power up, good sight to see. I checked points TP8 and TP9 with 20.04 / -20.04vdc.

Tested D18 with open and 228v.
  Reply With Quote
Old 15th January 2010, 04:11 PM   #7
diyAudio Member
 
Join Date: Jan 2010
Location: NC
Perry you think maybe replacing C57 and see?
  Reply With Quote
Old 27th January 2010, 06:11 PM   #8
diyAudio Member
 
Join Date: Jan 2010
Location: NC
Replaced C57 and D18 but still will not power up. Took D18 back out and the amp powers up. All three leds stay on red and TP10 and TP11 are showing 16.45.
Any other idea's?
  Reply With Quote
Old 27th January 2010, 08:13 PM   #9
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
What's the DC voltage on the 3 legs of Q38?
  Reply With Quote
Old 29th January 2010, 01:10 PM   #10
diyAudio Member
 
Join Date: Jan 2010
Location: NC
The center leg is .013 and two outer legs are .000.
  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
Soundstream Rubicon 204 amp. need help ! minde16v Car Audio 3 23rd November 2009 07:38 PM
Soundstream Rubicon 702 Issue Lobby Ludd Car Audio 4 24th September 2008 06:21 PM
Soundstream Rubicon 702 Output transistor Problem? tyu527 Car Audio 10 29th August 2008 06:37 AM
Soundstream Rubicon 805 audiobahnkid592 Car Audio 16 23rd July 2008 10:13 PM
Sub channel not working on Soundstream Rubicon 555 gti16vman Car Audio 5 20th May 2008 07:20 PM


New To Site? Need Help?

All times are GMT. The time now is 03:07 AM.


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