Crossfire VR2000D Repair issues - 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 December 2007, 09:55 PM   #11
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
http://www.mcminone.com/product.asp?...me=MCMProducts

Mouser will have the resistors and zener diodes. Order extras of each.

Did you check 'all' of the gate resistors on the outputs to make sure they were within tolerance?

Were the 2SC1027s (Q273 and Q283) OK?
  Reply With Quote
Old 31st December 2007, 10:14 PM   #12
diyAudio Member
 
Join Date: Dec 2007
I checked every single resistor and focused on the ones were looking at and all but that one read 1 ohm.

I did check the Q273,Q283, I had a reading around 0.5 volts with the neg on the 3rd leg and pos on the middle (2nd leg), but nothing on the 1st leg, but I was testing those while in the board.

Is there a specific physical size/tolerance/power rating I should be looking for when it comes to the resistor, there seems to be many size variations available. it measures around 0.128" or 3.29mm long.
  Reply With Quote
Old 31st December 2007, 10:40 PM   #13
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
If the resistor measures 0.128", it's either a 1206 (0.120" x 0.060") or a 1210 (0.120 x 0.100). Select whichever they are as the size when searching. From the photo, it appears that they may be 1210s. If you have a dial caliper, use that to measure them.

The tolerance isn't really important If the value on the originals is 1R0, it's a 5% component. Replace both of the 1 ohm resistors that were connected to the failed 2SA1023s.

If you read an open circuit on the 2SC1027s when you had the red lead on the 3rd leg and the black lead on the first leg, the transistor is defective. It should have read near 0.6v.
  Reply With Quote
Old 31st December 2007, 11:16 PM   #14
diyAudio Member
 
Join Date: Dec 2007
I re-tested the 2SC1027s , I tested them backwards earlier, they are fine when I test them properly. Amazing how that works...

Im going to order about 6 of each transistor and about 10 resistors just to have them on hand. I already have the 12 volt Zener diodes lying around from a power supply project from school.

Anything else I should look into before ordering?
  Reply With Quote
Old 31st December 2007, 11:30 PM   #15
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I can't think of any other parts you'd need. Get the parts in it and power it up. Remember to have ALL of the power semiconductors clamped tightly to the sink when you power it up. If there is a problem, you can destroy lots of parts if the transistors are not clamped down. Have a 15 amp fuse in the B+ line when you power it up.

You may want to make sure that all of the insulators are intact. You should also order a tube of heatsink compound.
  Reply With Quote
Old 31st December 2007, 11:37 PM   #16
diyAudio Member
 
Join Date: Dec 2007
ok, sounds good, I'll get back to you after power up next week.
  Reply With Quote
Old 8th January 2008, 12:06 AM   #17
diyAudio Member
 
Join Date: Dec 2007
I received your amplifier repair dvd and now im looking to buy some broken amps off e-bay to work on over the year to gain knowledge while going through your dvd and such.

I have found some great deals on these amps below, what would you recommend I start with and stay away from since im a level 1/2 repairer I guess.

Rockford P450.2
Rockford RF2002
Rockford P250.2
Rockford Punch 501S
Rockford Punch 120.2
Hifonics BX2005D
Alpine MRP-M450
Alpine MRP-F250
Kenwood KAC-929
Bazooka ELA500.1

Of course im looking for the best turn around profit margin, I would like to sell them and in turn use that money to buy equipment such as an Oscilloscope and such.
  Reply With Quote
Old 8th January 2008, 12:23 AM   #18
ppia600 is offline ppia600  United States
diyAudio Member
 
Join Date: Jun 2007
Location: Louis y ana
You would probably start at the bottom of the list and work your way up.
__________________
Don't worry... you can always turn the gain down!
  Reply With Quote
Old 8th January 2008, 12:58 AM   #19
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
The bazooka and the kenwood are probably going to be the easiest but they're probably not worth much.

I don't have much experience with the newer alpines but alpine sometimes uses relatively complex discrete circuits which can make troubleshooting difficult for those who are new to repair work. They do offer service manuals though which can make things easier (but is also an extra expense). In the newer amps, they epoxy the SMD components to the board so that can make it a bit more difficult to check/replace the components.

The class D Hifonics will probably be easy to repair if there isn't extensive damage to the driver board.

The punch amps are generally easy but you'll have to deal with SMD components and the MEHSA strips. Rockford also provides schematics for amps that are out of production.

Email me and I'll point you to relavent information on the disc.
  Reply With Quote
Old 10th January 2008, 09:34 PM   #20
diyAudio Member
 
Join Date: Dec 2007
Well looks like that got the Crossfire working again. I have it completely put back together hooked up on the bench with a 2 ohm load getting tested right now, I have it on a 50 hz tone and it seems to be playing distortion free for the last 15 min. I'll install it in my truck and give it a run for it's money later today and report back.
  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
Crossfire vr1000D sub amp no1stunna Swap Meet 0 21st February 2009 08:59 PM
Crossfire VR2000D Sounds terrible Mr. Old School Car Audio 3 26th December 2007 08:01 PM
Need HELP for Crossfire VR4000D JoergST Car Audio 2 4th December 2006 12:13 PM
Jon Stewart on Crossfire Prune The Lounge 3 17th October 2004 09:46 PM


New To Site? Need Help?

All times are GMT. The time now is 11:37 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