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Amplified box brand Lenoxx model CA-313 does not work on the mains, only by battery

28 Апр 2020 16:28 #6

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Amplified box brand Lenoxx model CA-313 does not work on the mains, only by battery

You can try it, just do the revision of 4 and 5 pins. See datasheet.

СКАЧАТЬ LD7552BS :

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29 Апр 2020 16:58 #7

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Amplified box brand Lenoxx model CA-313 does not work on the mains, only by battery

Can the SG6841 be used to replace the JT3028?
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30 Апр 2020 13:46 #8

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Amplified box brand Lenoxx model CA-313 does not work on the mains, only by battery

Yes SG6841 = JT3028

СКАЧАТЬ SG6841 :
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02 Май 2020 23:58 #9

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Amplified box brand Lenoxx model CA-313 does not work on the mains, only by battery

After changing the U4 (putting the SG6841) and changing the TL431 I got a voltage of more or less 14v on pin 3 of the U4 (SG6841) but this voltage keeps fluctuating, that is, it arrives at 14v and after 2 sec it drops and goes back to the 14v staying in this loop.
with the SG6841:
- the resistor connected to pin 4 is 24K
- the resistor connected in series with a diode to pin 7 is 10R
- the resistor connected to pin 6 is 470R
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03 Май 2020 09:43 #10

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Amplified box brand Lenoxx model CA-313 does not work on the mains, only by battery

Check all capacitors and resistances.
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05 Май 2020 00:03 #11

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Amplified box brand Lenoxx model CA-313 does not work on the mains, only by battery

One of the components that I had replaced that I am now in doubt as to whether I put the right or the wrong one would be the TL431 smd position Q8. What was before was a smd equal to the figure (download).

What I put now has a code 43A smd. My doubt would be if the 43A I put is a TL431 or not. If the 43A is not a TL431, how do I connect a TO92 TL431?
Вложения:
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05 Май 2020 08:56 #12

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Amplified box brand Lenoxx model CA-313 does not work on the mains, only by battery

Smd component 43A is KA431SMF.

СКАЧАТЬ KA431SMF :
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05 Май 2020 15:24 #13

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Amplified box brand Lenoxx model CA-313 does not work on the mains, only by battery

I put the regulator Q8 (TL431 TO-92) in place of the smd and another thing I noticed is that the diode connected in series with a resistance of 10R was diode 1N5399 in pin 7 do SG6841 , I found it strange because it is not a fast diode, so I changed and put a fast diode in place. Turning on the power supply provided the correct and stable voltages. At the source output, there would have to be a voltage of around 14v to charge the battery. This tension arose normally. Only to see if the voltage above the B + capacitor connected to the rectifier bridge is correct, it is showing around 190v (I am connecting the source to a 110VAC network).
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10 Май 2020 01:56 #14

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Amplified box brand Lenoxx model CA-313 does not work on the mains, only by battery

I tested the power supply on 110V and it worked fine. If it is connected to 220v, what voltages will I get on the SG6841 circuit?
Which components or part of the circuit stabilizes the voltages allowing it to work in both 110 and 220v?
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10 Май 2020 02:00 #15

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Amplified box brand Lenoxx model CA-313 does not work on the mains, only by battery

Turning on 220v will not have a waveform 2x bigger in the drain of the mosfet than if it was turned on 110v consequently a higher voltage at the output?
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