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-   -   Generic 1216 driver board (http://www.diyaudio.com/forums/car-audio/230599-generic-1216-driver-board.html)

nonprof 22nd February 2013 04:01 AM

Generic 1216 driver board
 
Hi guys!

just came back after a while...

http://www.bcae1.com/temp/dwm1216cla...d02img287x.jpg - thanks Perry on this hi-res picture!

I'm repairing this driver board because the output transistors heat-up while rail to rail voltages drops to +-22Volts from +-74Volts. - blue run light lits...

If I removed this board the amp looks fine and railt to rail are +-74V.


Testing and measuring components on this driver board seems fine.

Could somebody tell me what's the problem of this board? I replaced the LM293 but still no luck. How about the two IC's at the input side? Voltages on this board were available.

thank you for having opportunity to talk to you guys...

Perry Babin 22nd February 2013 01:41 PM

What make/model amp?

How much current was it drawing from the 12v power supply when the voltage dropped to 22v?

nonprof 26th February 2013 12:11 AM

Quote:

Originally Posted by Perry Babin (Post 3381200)
What make/model amp?

It's Sundown. Its generic amplifier.

How much current was it drawing from the 12v power supply when the voltage dropped to 22v?

Thanks! I suspected my power supply, I fixed it.Now, it goes to protect mode after switching ON. When I bypassed the protect mode by shorting the Pin 1 of TL494 into GND. I got a DC voltage at the speaker output (Approx 2Volts), and my speaker pop out very loud.

I dont know where I can buy this driver board...

Perry Babin 26th February 2013 12:16 AM

Q7, 11, 19 and 22 commonly fail on those driver boards. Check and/or replace those if you can't find any other problems.

nonprof 26th February 2013 12:29 AM

Quote:

Originally Posted by Perry Babin (Post 3386192)
Q7, 11, 19 and 22 commonly fail on those driver boards. Check and/or replace those if you can't find any other problems.

Ok Sir! thanks! I'll rechecked it again.

nonprof 26th February 2013 11:40 PM

Quote:

Originally Posted by Perry Babin (Post 3386192)
Q7, 11, 19 and 22 commonly fail on those driver boards. Check and/or replace those if you can't find any other problems.


Hi Perry/Guys!

I replace these transistors, Q7,11,19 and 22 but no luck at all.
After I bypassed the protect mode, I measured free flow -74V at the output speaker terminal. I guess IRF640N output transistors are turned ON. While gate terminals are pure DC -65V.
If i'm right, I suspected the waveform generator inside the driver is not functioning.
Can you please help me to understand the job of the two identical IC in the driver board?I dont know their part number.
And which of the part of this board is the signal generator?

Thanks Perry!

Perry Babin 27th February 2013 12:44 PM

There is no waveform generator. Those are only found on 'clocked' class D circuits. Most class D amps are (unfortunately) self oscillating and harder to troubleshoot when there is a problem.

You need to confirm that all of the voltages on the driver board pins are correct. Post the DC voltage on all of the pins if you need help.

nonprof 28th February 2013 10:32 PM

Quote:

Originally Posted by Perry Babin (Post 3388292)
There is no waveform generator. Those are only found on 'clocked' class D circuits. Most class D amps are (unfortunately) self oscillating and harder to troubleshoot when there is a problem.

You need to confirm that all of the voltages on the driver board pins are correct. Post the DC voltage on all of the pins if you need help.

here are the measurements: thanks!
FRom left to right
1. +74
2. +61.8
3. +62.6
4. -73
5.-60
6.-72.9
7.-72.9

8.11
9.-14.6
10.-4.6
11.0.2
12..02
13.5
14.15
15. 4.4

16. -73
17. -73
18. -61
19. -73
20.+63
21. +63
22. +73.7

Perry Babin 1st March 2013 01:20 AM

The -15 (pin 9) and the -5 (pin 10) are a bit off but I don't think that will be a problem.

nonprof 30th March 2013 01:17 AM

Quote:

Originally Posted by Perry Babin (Post 3390442)
The -15 (pin 9) and the -5 (pin 10) are a bit off but I don't think that will be a problem.

Hi Perry, do you have this schematic? I need to repair this board, difficult to find and expensive to purchase this internationally. can I trade my schematic?

Thanks!


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