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Old 15th March 2007, 03:32 AM   #1
jf8620 is offline jf8620  United States
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Default 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
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Old 15th March 2007, 04:04 AM   #2
jf8620 is offline jf8620  United States
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Old 15th March 2007, 07:43 PM   #3
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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.
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Old 16th March 2007, 12:38 AM   #4
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It appears the traces on the board have bubbled? Is this true or just the photo?
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Old 16th March 2007, 05:04 AM   #5
jf8620 is offline jf8620  United States
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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.
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Old 18th March 2007, 11:00 PM   #6
jf8620 is offline jf8620  United States
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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 (+)
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