punch 100dsm help

ben04srt · 30th January 2009, 08:14 PM

I am having trouble find out why I have no power on this thing.
The ps fets were replaced first and the outputs checked out ok.

Do the pwm chip go out on these often?
I have no leaking caps , already checked that.

Perry Babin · 30th January 2009, 08:24 PM

Post the DC voltage on all of the pins of the TL494 driver IC.

(copy and paste this into your reply)

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:

BEAR-K · 30th January 2009, 08:25 PM

That series of Fosgate amps used a daughter board as the power supply pwm oscilator & driver to the FETs. These were
most often the culprit. The boards have been out of production
and out of stock a number of years. At our service facility we were
never able to repair the daughter boards as it meant soldering to
a pad on a ceramic surface. Perhaps someone else had sucess.
Bear-k

Perry Babin · 30th January 2009, 08:37 PM

I think this is the board he has:
http://www.bcae1.com/temp/img372rock...rsupplyold.jpg

ben04srt · 31st January 2009, 05:37 AM

I have no power on the tl594c at all
Pin 1: 0.00
Pin 2: 0.00
Pin 3: 0.90
Pin 4: 0.00
Pin 5: 0.00
Pin 6: 0.00
Pin 7: 0.00
Pin 8: 0.00
Pin 9: 0.00
Pin 10: 0.00
Pin 11: 0.00
Pin 12: 0.00
Pin 13: 0.00
Pin 14: 0.00
Pin 15: 0.00
Pin 16:0.010

Reflowed the solder on the vertical board , didn't help.
I have power up to the board then nothing to the ic.

Perry Babin · 31st January 2009, 08:34 AM

You probably have a broken connection on the remote terminal of the amp.

I Am An Idiot · 31st January 2009, 11:53 AM

Ben, when you said you have power up to the board, were you talking about up to the vertical board, or did you mean the mainboard?

ben04srt · 31st January 2009, 01:23 PM

I have power up to the vertical board.

Is the remote wire what supplys power to the IC?

Perry Babin · 31st January 2009, 02:02 PM

Remote voltage goes into pin 8 of the driver board (counting left to right, looking at the component side of the driver board), through a diode (4th black component from the left on the bottom row in the photo I posted) and then to pins 8, 11 and 12 of the 494. The voltage goes into the top terminal of the diode and exits from the bottom right terminal.

ben04srt · 1st February 2009, 01:03 AM

The diode is bad , power in no power out.
I have some A7 diodes from old punch 45hd boards will that work ?
I think the one that is on there is A7c maybe.

30th January 2009, 08:14 PM	#1
ben04srt diyAudio Member Join Date: Jul 2006 Location: Dover,ohio	punch 100dsm help I am having trouble find out why I have no power on this thing. The ps fets were replaced first and the outputs checked out ok. Do the pwm chip go out on these often? I have no leaking caps , already checked that.

30th January 2009, 08:24 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Post the DC voltage on all of the pins of the TL494 driver IC. (copy and paste this into your reply) 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: __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

30th January 2009, 08:25 PM	#3
BEAR-K diyAudio Member Join Date: Aug 2007	dead 100dsm That series of Fosgate amps used a daughter board as the power supply pwm oscilator & driver to the FETs. These were most often the culprit. The boards have been out of production and out of stock a number of years. At our service facility we were never able to repair the daughter boards as it meant soldering to a pad on a ceramic surface. Perhaps someone else had sucess. Bear-k

30th January 2009, 08:37 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I think this is the board he has: http://www.bcae1.com/temp/img372rock...rsupplyold.jpg __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

31st January 2009, 08:34 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	You probably have a broken connection on the remote terminal of the amp. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


	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

31st January 2009, 05:37 AM	#5
ben04srt diyAudio Member Join Date: Jul 2006 Location: Dover,ohio	I have no power on the tl594c at all Pin 1: 0.00 Pin 2: 0.00 Pin 3: 0.90 Pin 4: 0.00 Pin 5: 0.00 Pin 6: 0.00 Pin 7: 0.00 Pin 8: 0.00 Pin 9: 0.00 Pin 10: 0.00 Pin 11: 0.00 Pin 12: 0.00 Pin 13: 0.00 Pin 14: 0.00 Pin 15: 0.00 Pin 16:0.010 Reflowed the solder on the vertical board , didn't help. I have power up to the board then nothing to the ic.

31st January 2009, 11:53 AM	#7
I Am An Idiot diyAudio Member Join Date: Mar 2007	Ben, when you said you have power up to the board, were you talking about up to the vertical board, or did you mean the mainboard? __________________ If it ain't broke Don't fix it

31st January 2009, 01:23 PM	#8
ben04srt diyAudio Member Join Date: Jul 2006 Location: Dover,ohio	I have power up to the vertical board. Is the remote wire what supplys power to the IC?

31st January 2009, 02:02 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Remote voltage goes into pin 8 of the driver board (counting left to right, looking at the component side of the driver board), through a diode (4th black component from the left on the bottom row in the photo I posted) and then to pins 8, 11 and 12 of the 494. The voltage goes into the top terminal of the diode and exits from the bottom right terminal. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

1st February 2009, 01:03 AM	#10
ben04srt diyAudio Member Join Date: Jul 2006 Location: Dover,ohio	The diode is bad , power in no power out. I have some A7 diodes from old punch 45hd boards will that work ? I think the one that is on there is A7c maybe.

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

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
Selling a punch 250a2, old punch 75, and ppi epx 205 on EBAY	ppia600	Swap Meet	0	23rd February 2008 01:17 AM
Punch 800.2	meepers	Car Audio	26	16th January 2008 09:32 PM
RF Punch 75.2, help plz	JSmooth420	Car Audio	5	17th September 2006 10:20 AM
My experience: the cheap punch set VS Greenlee punch	vax9000	Tubes / Valves	5	21st July 2006 07:52 PM

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