Mercedes Becker Autoradio Trunk Amp

jf8620 · 15th March 2007, 03:32 AM

Does anyone know anythin about this amp. It's becker Autoradio Amp in the trunk of a 1993 190E mercedes. It has some numbers 1901 1043.899/1100 and 11 G A BS 1043.821-373.

I just want to know how to get it to work. It only has a 12 pin plug. I can't seam to figure out what pin is the Remote. Or which pins are the input and output.

Ps it a very small amp with 2 tda7256 transistors and 2 MC33074Ap chips. There is a main fuse which i'm guessing is the 12 + and then 2 pins have direct paths to ground traces so im guessing there -12

jf8620 · 15th March 2007, 04:04 AM

Here are some pics

Perry Babin · 15th March 2007, 07:43 PM

http://www.st.com/stonline/products/...re/ds/1473.pdf

Pins 9 and 11 are the speaker outputs of the IC. You should be able to trace those to the connector (~0 ohms between the IC and the terminals). It looks like they are the outer 2 pins on each side.

It likely has 4 inputs. They should go toward the op-amps. They should be easy to follow. If I had to guess, I'd say that the inputs were pins 4 and 5 from each end of the row of pins on the connector.

The one remaining should be turn on. Measure the voltage on it (B+ and ground connected) before connecting anything to it. If it's at or near ground, it likely requires 12v to switch it on. If it's at or near B+, it likely requires a ground to turn it on.

After you get the amp to power up, apply signal to each input (one at a time). If you followed the positives and negatives from the output IC to the connector, you can determine which inputs are positive and which are negative. If feeding any input pin produces signal on 'two' outputs, the inputs are not independant. If that's the case, it's likely that the positve inputs are both on top OR on bottom of the connector.

Of course, do this at your own risk.

audiobahnkid592 · 16th March 2007, 12:38 AM

It appears the traces on the board have bubbled? Is this true or just the photo?

jf8620 · 16th March 2007, 05:04 AM

Thank's Perry i'll have to look into everything you said and see if i can get it to turn on.

Audiobahn The traces are pretty good not bubbled just covered in a clear substanace.

jf8620 · 18th March 2007, 11:00 PM

Thank's Perry I got it to work Turns out the Remote is (+)

Pins:
1&2, 11&12 - output
4&5, 9&8 - input
6- (+) 12volts
10- ground
7- remote (+)

15th March 2007, 03:32 AM	#1
jf8620 diyAudio Member Join Date: Dec 2005 Location: Ohio	Mercedes Becker Autoradio Trunk Amp Does anyone know anythin about this amp. It's becker Autoradio Amp in the trunk of a 1993 190E mercedes. It has some numbers 1901 1043.899/1100 and 11 G A BS 1043.821-373. I just want to know how to get it to work. It only has a 12 pin plug. I can't seam to figure out what pin is the Remote. Or which pins are the input and output. Ps it a very small amp with 2 tda7256 transistors and 2 MC33074Ap chips. There is a main fuse which i'm guessing is the 12 + and then 2 pins have direct paths to ground traces so im guessing there -12

15th March 2007, 04:04 AM	#2
jf8620 diyAudio Member Join Date: Dec 2005 Location: Ohio	Pic's Here are some pics

15th March 2007, 07:43 PM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	http://www.st.com/stonline/products/...re/ds/1473.pdf Pins 9 and 11 are the speaker outputs of the IC. You should be able to trace those to the connector (~0 ohms between the IC and the terminals). It looks like they are the outer 2 pins on each side. It likely has 4 inputs. They should go toward the op-amps. They should be easy to follow. If I had to guess, I'd say that the inputs were pins 4 and 5 from each end of the row of pins on the connector. The one remaining should be turn on. Measure the voltage on it (B+ and ground connected) before connecting anything to it. If it's at or near ground, it likely requires 12v to switch it on. If it's at or near B+, it likely requires a ground to turn it on. After you get the amp to power up, apply signal to each input (one at a time). If you followed the positives and negatives from the output IC to the connector, you can determine which inputs are positive and which are negative. If feeding any input pin produces signal on 'two' outputs, the inputs are not independant. If that's the case, it's likely that the positve inputs are both on top OR on bottom of the connector. Of course, do this at your own risk. __________________ 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
WTB: Becker 8" woofer/s from Vandersteen 2A	AVWERK	Swap Meet	3	12th November 2008 11:43 PM
mercedes 300te and ice	smithie	Car Audio	3	27th August 2005 02:55 AM
Becker - Le Mans cd	JDeV	Car Audio	1	30th March 2005 05:09 PM
need a sub for ~22.5 cu ft trunk	xplod1236	Car Audio	6	31st January 2005 01:19 PM
DIY Mercedes SLR!!!!	Bricolo	Everything Else	23	2nd June 2003 07:47 PM


	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

16th March 2007, 12:38 AM	#4
audiobahnkid592 diyAudio Member Join Date: Mar 2007	It appears the traces on the board have bubbled? Is this true or just the photo?

16th March 2007, 05:04 AM	#5
jf8620 diyAudio Member Join Date: Dec 2005 Location: Ohio	Thank's Perry i'll have to look into everything you said and see if i can get it to turn on. Audiobahn The traces are pretty good not bubbled just covered in a clear substanace.

18th March 2007, 11:00 PM	#6
jf8620 diyAudio Member Join Date: Dec 2005 Location: Ohio	Thank's Perry I got it to work Turns out the Remote is (+) Pins: 1&2, 11&12 - output 4&5, 9&8 - input 6- (+) 12volts 10- ground 7- remote (+)

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

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