California Electronics pro-8800a digital amplifier stereo

[labello]

looks at least 1 watt maybe 2 watts so will be fine if not smoking

Hi thanks for your reply, the problem is that the front pannel don't work at all😒 dedicated knobs and buttons nothing only on and off. Thanks

[petehall347]

looks at least 1 watt maybe 2 watts so will be fine if not smoking

[labello]

post pictures of it with a 1/4 watt resistor held next to it

Hi there's a couple of pictures. Thanks

[petehall347]

Hi someone can tell me how to check the wattage on that resistor, thanks

post pictures of it with a 1/4 watt resistor held next to it

[labello]

Hi someone can tell me how to check the wattage on that resistor, thanks

[labello]

what wattage is the resistor ?

It's the original one, wattage? I don't know how to test wattage. Thanks

[petehall347]

Hi thanks, so in my case there's too much current across it right, I already changed it but no luck

what wattage is the resistor ?

[labello]

no the resistor
anyway 8v across 91 ohms is 0.7032967 watts

Hi thanks, so in my case there's too much current across it right, I already changed it but no luck

[petehall347]

You mean datasheet of the board? I didn't find it 😔

no the resistor
anyway 8v across 91 ohms is 0.7032967 watts

[labello]

that is not the datasheet

You mean datasheet of the board? I didn't find it 😔

[petehall347]

Hi thanks a lot for the reply, the voltage is about 8 voltage. The datasheet don't tells me anything about voltage only the ohms

that is not the datasheet

[labello]

what does the datasheet say for the resistor ? you can calculate the current by measuring the voltage right across it

Hi thanks a lot for the reply, the voltage is about 8 voltage. The datasheet don't tells me anything about voltage only the ohms

[petehall347]

Hi i already changed the pico capacitor, I changed all of them. But stil it doesn't work that resistor still getting HOT as you can see on the picture . Honestly guys I don't know what I should do. 😔 thanks to all

what does the datasheet say for the resistor ? you can calculate the current by measuring the voltage right across it

[labello]

this one here .. and what is that silvery mess in the other pic ?

Hi i already changed the pico capacitor, I changed all of them. But stil it doesn't work that resistor still getting HOT as you can see on the picture . Honestly guys I don't know what I should do. 😔 thanks to all

[labello]

what is getting hot ?
looking at the pics i see what might be a burned capacitor next to a driver transistor .
have you measured dc voltages at the speaker outs ? and also the voltages across the low ohm emitter resistors next to the outputs ?

Hi I'm sorry for the late, anyway I measured in the back side I don't have any voltages ,then in the input side I have a very high ohm. . You can see on pictures here. And thanks to all for the reply 🙏 I really hope we can fix this amplifier it's a nightmare 🙄

[labello]

Hi guys i replaced those components on the heatsink and the resistor that blown up. So I test it with phone to read input and it works but I can't slow down the volume on the front pannel, so I check the board and the same resistor going almost 80/90 degrees ... it's normal? Before was really hot 150 degrees.. thanks to all for the reply

[labello]

Hi guys, what about those resistor they have similar mark on the board but as you can see the similar is different... is strange isn't Thank you

[labello]

same as what is there . they are pairs of npn pnp one of each for each channel .

Understand, I'll buying and we'll see how's it goes. Thanks for the reply and happy new year to all 👍🙏

[petehall347]

So both mark are the same right? Thanks

same as what is there . they are pairs of npn pnp one of each for each channel .

[labello]

yes replace with same . also be sure the bias tracking tracking transistors are good .

So both mark are the same right? Thanks