rockford RF X3 - 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 1st April 2010, 02:36 PM   #1
diyAudio Member
 
Join Date: Jul 2008
Location: Montreal
Send a message via Yahoo to scampo77
Default rockford RF X3

i found another amp at a flea market and it doesnt seem to be working i took it apart and checked the outputs and the power supply and they all test ok. the cases are the big ones for all the outputs and power supply. i checked them the normal way i would check the TO-220 cases. none of them have any shorts between the legs and are all around .5

there are 8 TO220 cases in the middle of the amp bolted to the heatsink and i dont know what they are for or if i should pull and test them. they are ....

LM337T, LM317T x2 ,LM1086, regulators possibly?
U1620 x2, U1620R x2 rectifiers possibly?

i imagine these are rectifiers and regulators. do these fail and if they do fail can i check them like other FETs?

this is the second RF amp i have taken apart and the second time i have seen all the FETs glued to a heat sink board thing. how do i get them off this board and how do i re apply the new ones.

i cant find any other name or product code on this amp but the serial on the main board is PC-3914-F X3
  Reply With Quote
Old 1st April 2010, 04:27 PM   #2
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
You have the regs and rectifiers right. They can fail but it's not common in Rockford amps. The regs can't be checked for anything other than shorts (a rare failure mode for regulators). The rectifiers can be checked with a meter.

They are soldered to the insulators.

Email me.
babin_perry@yahoo.com
  Reply With Quote
Old 1st April 2010, 10:34 PM   #3
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
This explains how to replace the transistors on the MEHSA insulators.
t30001bd schematics

You can (and should) get a copy of the schematic diagram from Rockford.

Can you post at least one photo of the main board in the amp?

When you power up the amp, does it do anything?

If not, post the DC voltage on the SG3526 driver IC.

IC#
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:
Pin 17:
Pin 18:
  Reply With Quote
Old 2nd April 2010, 02:27 PM   #4
diyAudio Member
 
Join Date: Jul 2008
Location: Montreal
Send a message via Yahoo to scampo77
1 5
2 5
3 1
4 4.7
5 4.8
6 0
7 0
8 5
9 3.7
10 2
11 0
12 4.4
13 6.8
14 15.8
15 0
16 6.8
17 15.8
18 5


when i first connect remote power to the amp i get a buzzing sound that seems to be originating from the power supply of the amp.it only does it for a second or two then stops. i can also get this same sound to happen non stop if i touch pins 9,10 with my multimeter. i tried wiggiling the FETs and the torroid and the caps to check for a bad solder but it doesnt change anything and im not getting any visible sparking either. it kind of sounds like electricity arc-ing. i even shut off all the lights and looked for any sparking brightness and cant find anything.
Attached Images
File Type: jpg 100_0193.jpg (134.6 KB, 46 views)
  Reply With Quote
Old 2nd April 2010, 02:40 PM   #5
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Does it change anything (does the amp power up normally) if you reduce the voltage on your DC power supply to ~14v?

If not, post the DC voltage on the LM339.
  Reply With Quote
Old 2nd April 2010, 06:03 PM   #6
diyAudio Member
 
Join Date: Jul 2008
Location: Montreal
Send a message via Yahoo to scampo77
1 16.6
2 4.8
3 15.8
4 .2
5 2
6 5
7 5.3
8 3.8
9 5
10 5
11 6
12 ground
13 4.8
14 4.8

my power supply is about 15.5v and when i hook up the amp it drops to about 11.7. i dont know if this answers your trouble shooting of dropping to 14v or not.
  Reply With Quote
Old 2nd April 2010, 06:10 PM   #7
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
From the voltages you posted, it appears that this amp is a bit different than the schematic I'm using. Get the correct schematic diagram from Rockford and email me a copy.

babin_perry@yahoo.com
  Reply With Quote
Old 2nd April 2010, 07:08 PM   #8
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
From what I can tell, there's no reason that the amp wouldn't produce audio. Does it produce audio (distorted or otherwise)?
  Reply With Quote
Old 5th April 2010, 12:55 AM   #9
diyAudio Member
 
Join Date: Jul 2008
Location: Montreal
Send a message via Yahoo to scampo77
no still no sound but the outputs are getting warm/hot and also the bank of TO-220 cases is getting hot CR1,2 D16,17

there is no LED light anywhere on this amp to tell me if it is powering on all i have is the little screen i think it must be for adjusting the slopes? but it wont power on either.
  Reply With Quote
Old 5th April 2010, 01:03 AM   #10
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
What is the DC voltage measured directly across the speaker terminals?

What is the DC voltage measured from the tab of D16 to the tab of D17?

What is the DC voltage measured from the tab of D18 to the tab of D19?

With the black probe on the amplifier's ground terminal...

What is the DC voltage on leg 3 of the LM337?

What is the DC voltage on leg 2 of the LM317?
  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
ppi x3 power supply transistors... what are they??? ppia600 Car Audio 8 28th March 2008 03:18 PM
What is HD-X3 all about ? jsa_ind Multi-Way 2 14th October 2006 01:11 AM
Clock multiplier x3 apolon34 Digital Source 14 29th April 2006 10:44 AM
Nelson X3 arrival questions Addicted Help!! Pass Labs 45 30th April 2004 06:57 PM


New To Site? Need Help?

All times are GMT. The time now is 07:43 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