Noise on remote connection Punch 75

damage · 5th April 2011, 01:02 AM

I fixed an Original Punch 75 today which had severe PS problems. Everything was great until I decided to replace one of the 1000uf caps. Seems there is a diode (1n4003) that runs from ground on that cap to an ~150 ohm resistor.

Long story short, I lost the diode, wasn't sure it was a 4003, so used a 4007, and some magic smoke came out, from exactly where I don't know. Found another 4003 and put it in.

Problem is, the amp now makes a noise for about 3 seconds before clearing up when the remote wire is attached. Since the schematic for punch 45 Rev C doesn't match exactly, what exactly am I looking for?

Perry Babin · 5th April 2011, 01:24 AM

Aren't you missing a driver transistor?

email me if you want the P75 schematic diagrams I have.
babin_perry@yahoo.com

damage · 5th April 2011, 01:48 AM

I put the drivers (A06) under the board as you suggested in your tutorial.

damage · 5th April 2011, 01:50 AM

This was an inherited repair that I fixed. But like I said it was working perfect until I decided to swap that capacitor out.

damage · 25th April 2011, 03:28 AM

Spent quite a bit of time on this one as it was an early Punch 75. Finally, after removing a few extra parts (previous repair,) finding a new capacitor that was leaking, changing repaired resistors with the right value, I STILL HAD THE PROBLEM!

But I measured to forward voltage on the bad side, and figured out it was a leaky 6417 driver that tested good, but did leak. Replacing it with a ZTX643 took care of the problem. Now the amp works really well.

5th April 2011, 01:24 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Aren't you missing a driver transistor? email me if you want the P75 schematic diagrams I have. babin_perry@yahoo.com __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Rockford Punch 75.2 Trans-Ana	Dr Zeus	Car Audio	6	23rd November 2010 01:17 PM
rockford punch 75 hd	mike49504	Car Audio	10	16th November 2010 06:36 PM
Selling a punch 250a2, old punch 75, and ppi epx 205 on EBAY	ppia600	Swap Meet	0	23rd February 2008 01:17 AM
Rockford Punch 75 (non HD)	Clipped	Car Audio	8	18th October 2007 10:56 AM
RF Punch 75.2, help plz	JSmooth420	Car Audio	5	17th September 2006 10:20 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

5th April 2011, 01:48 AM	#3
damage diyAudio Member Join Date: May 2006	I put the drivers (A06) under the board as you suggested in your tutorial.

5th April 2011, 01:50 AM	#4
damage diyAudio Member Join Date: May 2006	This was an inherited repair that I fixed. But like I said it was working perfect until I decided to swap that capacitor out.

25th April 2011, 03:28 AM	#5
damage diyAudio Member Join Date: May 2006	Spent quite a bit of time on this one as it was an early Punch 75. Finally, after removing a few extra parts (previous repair,) finding a new capacitor that was leaking, changing repaired resistors with the right value, I STILL HAD THE PROBLEM! But I measured to forward voltage on the bad side, and figured out it was a leaky 6417 driver that tested good, but did leak. Replacing it with a ZTX643 took care of the problem. Now the amp works really well.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)