Alpine mdr-m500 turns on but there is no sound

[Mjimenez]

hello friends again turning to you, this time I got an amplifier of the Alpine brand in the model mdr-m500 the problem here is that the blue LED lights up the screen ... so everything is normal but there is no sound in the Departures. already check the exit section and all the fets are ok any suggestions greetings

 

[Perry Babin]

Are you sure that's the correct model #?

Do you have positive and negative rail voltage?

Do you have positive and negative regulated voltage on the power supply pins of the op-amps?

 

[Mjimenez]

Hello if you already did work was only low voltage in the fuse for oxide, if you have their voltages only now when I go up the volume as this begins to lose force and the only thing that makes it move Horn but not sound, the moves strongly, under the volume and calm and begins to work well as you browse drivres damaged and have not come out not that may be missing now.

 

[Perry Babin]

Do you have positive and negative rail voltage?

Do you have positive and negative regulated voltage on the power supply pins of the op-amps?

 

[Mjimenez]

Well these are the voltages that present each of the output fets and the rectifiers do not know if I'm doing the measurement well if I'm wrong, please correct what you think

 

[Perry Babin]

Do you have positive and negative regulated voltage on the power supply pins of the op-amps?

 

[Mjimenez]

Hello friend Perry you ask thousand apologies for not follow the subject I frustrates with this amplifier, today I decided to return the matter. Good you commented I find myself with the upc494gs does not work or not generates oscillation to connect the remote pins 8 and 11 the 494 up to 12v but a second after falls and simply not ranges so I don't have already or pulse I hope I can help awakening this Alpine

 

[Mjimenez]

remove the upc494gs to test if this is the fault but does the same

 

[Perry Babin]

You had rail voltage on the rectifiers. Did it stop producing rail voltage?

 

[Mjimenez]

of course I had them, but I stop working and now the upc494gs does not turn on, if it reaches 12v to pin 12

 

[Perry Babin]

I'm having trouble understanding what you're trying to say. The language barrier may be too great.

 

[Mjimenez]

well try to express myself correctly, before there was rail voltage before leaving for a while

 

[Perry Babin]

I think you would have to post the DC voltage on all terminals of the 494 when it fails to produce rail voltage.

 

[Mjimenez]

Oky I will

 

[Mjimenez]

are here

 

[Perry Babin]

Is it giving you an error on the display?

 

[Mjimenez]

no mistake

 

[Mjimenez]

I bought the service manual but I still get very confused if you like I can send it to you

 

[Perry Babin]

With the black probe on the main ground, what is the DC voltage on the B+ and remote terminals?

Can you increase the supply voltage to about 13.5v?

 

[Mjimenez]

13.8 a 14.3