Yroger

Whaou !!😲

Hello, A week ago I bought a used mains power supply with the dsp card and the control panel of an RT10D with the idea of comparing this power supply with the mains supply of my Jamo D600 which is largely similar. I have already repaired (well I think) the RT10D power supply. two of the four mosfets were shorted as well as the two 1µF film capacitors that had exploded. I took the opportunity to replace all the small chemical capacitors that are on this card; many were tired (high esr). On power up everything seems normal, the control panel reacts. On the other hand I have a big plop (in the loudspeaker) at each power-up. I took a voltage reading and there are 360 millivolts DC once the system is running without any source connected to the amplifier input!! Does anyone have any feedback on this? It seems to me all the same that it is quite high as DC voltage. To read to you.

Information and various tests carried out so far have failed to bring this active subwoofer back to life. The main power board seems operational and unfortunately for the time being, no clue on the causes of the failure seems to be looming on the horizon. Thank you very much to Bricol67 for the time spent

Bonjour, Il faudrait en premier contrôler le primaire de l'alimentation de l'ampli (pont de diode condensateurs de lissage) puis regarder les deux petits fusibles rond type 382 de l'alimentation régulée.

You have to look at the second-hand market and buy a broken box at a low price to recover parts but with the risk that the defective components are the same you will have to ask the seller about the failure encountered with his box and that this one is different from yours.

With a Peak DCA75 analyzer he confirms to me that it is an operational BJT pnp with a gain of 200 ! the components have been desoldered is tested individually; it is no longer to understand it.

I have no good news because all the components are good !!

Ok so Q4 shunted and J3 connector configured in standby mode (pin 1 - 4) here are the voltage measured on connector J2 (power supply only)

Ok pourtant avec le multimètre c’était bon ! Je regarde cela demain matin. Bonne soirée.

D3: (standby mode): 16v D3 (power on mode): 16v MMBT4403 (standby mode): 15,4v MMBT4403 (power on mode): 15,4v

Yes the voltage changes as indicated in previous post 0V to 16V but I use a jumper between pins 1 - 4 and 3 - 4 to change mode!

you must check the transistor Q4 and Q2 + R1 and R2. It's good diode test !! 16V ok -0.5v nothing no reaction: 0v !

Hello Bricol67, I confirm mains supply only by simulating a standby switch the voltages remain present as indicated post of 06.11 at 17:13

I admit being a little lost with all these pins and connectors connected or not .... If this is indeed the case, that the voltages on J2 do not go to 0, with a voltage of 8V on the standby pin of J3, your power supply is not working correctly. in fact the standby pin on J3 and 1 ?? On your modified diet diagram posted on 10.11 at 07:44 PM, you noted: pin 4 J3 stanby ???

Hello Bricol67, In fact, you have to measure between the negative of C49 and terminal 1. With the J3 connector plugged in, you should find about 0.5v or 0.7v. It's good I measure - 0.5v With connector J3 unplugged this voltage should increase to about 10 to 15 volts. It's good I measure 16v I have more and more the impression that the mains supply is not the cause of the failure. Little additional information: (fully connected amplifier, ready-to-use subwoofer). When the power is turned on and there is no signal applied to the input, the loudspeaker goes boom boom and the control panel does not light up ! If I disconnect J3 and repeat the operation the speaker generates hiss instead of the boom boom and the control panel still does not react ! Roger.