Rockford Punch 60x2 DSM - Page 2 - 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 31st October 2010, 12:05 AM   #11
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Is there a D7 connected in parallel with R32?

If so remove it and measure the resistance across R32 again.

It's supposed read 0 ohms from shield to shield. This input circuit has virtually nothing in common with the PPI amps.

Have you removed it from the heatsink to see if you have any open traces on the bottom of the board (I'm assuming you would have noticed any on the top)?
  Reply With Quote
Old 31st October 2010, 12:18 AM   #12
Dr Zeus is offline Dr Zeus  United States
diyAudio Member
 
Dr Zeus's Avatar
 
Join Date: Oct 2010
OK D7 is out, and it fails testing on my DVM's continuity test. Its supposed to beep once, but this diode just acts shorted. 0.0 ohms actross it. For reference theres D1 near the transformer that looks the same as D7. D1 tests out fine with DVM.

I'm going to replace D7, but unfortunately I dont have spares so it will take a little while.

R32 measures just a hair shy of 1k ohms now.

Last edited by Dr Zeus; 31st October 2010 at 12:20 AM.
  Reply With Quote
Old 31st October 2010, 12:51 AM   #13
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
open traces?
  Reply With Quote
Old 31st October 2010, 03:25 AM   #14
Dr Zeus is offline Dr Zeus  United States
diyAudio Member
 
Dr Zeus's Avatar
 
Join Date: Oct 2010
I dont see any open traces.

I was able to replace D7. As it happens the Radio Shack accross the street from me actually stocks Z1 4003 diodes. It now tests good on the PCB while the R32 is also measuring 1k ohms. Unfortunately thats about all it fixed, and still none of the previous tests are passing.

10ohms from RCA shield to shield
Rising resistance from RCA shield to ground (Normal I guess)
DC voltage across terminals when powered
  Reply With Quote
Old 31st October 2010, 04:40 AM   #15
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I think you have an open trace somewhere. It could be where the diode is soldered into the board (damaged via/feedthrough). One end of R32 connects to the RCA shield. The other end connects to the amp ground. You should read the same if you read across R32 or from the shield ground to the amp ground.
  Reply With Quote
Old 31st October 2010, 04:58 AM   #16
Dr Zeus is offline Dr Zeus  United States
diyAudio Member
 
Dr Zeus's Avatar
 
Join Date: Oct 2010
Oh my I think you are totally right. I just found a very very thin hairline trace that shows not connected - and its just half an inch from the Right RCA shield.

Take a look at this photo. Its a little blurry, but you can just barely make out the copper from the trace that blew near R103. The break I'm talking about is just up about 1/16 of an inch from R103 and looks sort of like the trace 'popped' like a fuse.

Click the image to open in full size.

I'm going to drop a new connection point from the hole just next to R104 over to an empty hole near C123.
  Reply With Quote
Old 31st October 2010, 05:08 AM   #17
Dr Zeus is offline Dr Zeus  United States
diyAudio Member
 
Dr Zeus's Avatar
 
Join Date: Oct 2010
And here's my fix. Still have to test this out.

Click the image to open in full size.
  Reply With Quote
Old 31st October 2010, 05:14 AM   #18
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
It's not normal for most Rockford amps but this one does have a 10 ohm resistor (R33) between the RCA shields.
  Reply With Quote
Old 31st October 2010, 05:17 AM   #19
Dr Zeus is offline Dr Zeus  United States
diyAudio Member
 
Dr Zeus's Avatar
 
Join Date: Oct 2010
Yes shields still measure 10 ohms across. I powered her up and she's making sound on both channels; and very close to 0.0v DC across speaker terminals.


Now I've gotta set the pots back. I presume this is like the PPI amps? Set them to 0.000v DC across emitter resistors? EDIT: Yup! She's back in tune and sounds pretty good. I'll go back and check it through with the OScope and go from there.

Thanks Perry!

Last edited by Dr Zeus; 31st October 2010 at 05:20 AM.
  Reply With Quote
Old 31st October 2010, 05:20 AM   #20
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Set it to just over 0.000. 0.001 should be good. Make sure that all transistors are tightly clamped to the heatsink before making any adjustments. Re-check it after it's been idling for several minutes.
  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
Rockford Fosgate 60 XI DSM mike49504 Car Audio 2 9th March 2010 04:27 AM
Rockford punch 100 dsm mike49504 Car Audio 1 13th December 2009 01:41 AM
punch 100 dsm question ben04srt Car Audio 32 7th December 2009 01:38 AM
punch 60 dsm getting warm ben04srt Car Audio 5 3rd June 2009 11:37 PM
another punch 100 dsm issue ben04srt Car Audio 17 20th March 2009 03:09 AM


New To Site? Need Help?

All times are GMT. The time now is 07:19 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