California Electronics pro-8800a digital amplifier stereo

[petehall347]

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

[labello]

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

Hi don't worry it's just dirty, anyway thanks for the reply, I found those cable almost broken then I resolder them, but in one side the resistor doesn't getting hot anymore, then in the other side blown up another resistor and two transistor in the heatsink circled red on picture, now they are different, 2 marks on it TOSHIBA 2SA1943 and the others are TOSHIBA 2SC500 . Can I replaced all whit the same mark or i must replaced different like they are now? Thanks for the reply 👍

[labello]

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[R_J]

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[petehall347]

Hold on you just know Where's the problem?( i see what might be a burned capacitor next to a driver transistor) how can you know that through a picture ..? Really...

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

[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 ?

Hold on you just know Where's the problem?( i see what might be a burned capacitor next to a driver transistor) how can you know that through a picture ..? Really...

[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, thanks for the reply, the resistor that I marked with arrow yellow, then I changed both transistor red colour but nothing changed (also I changed also that resistor still getting hot about 100/150 degrees. No i didn't take measurements, I just go ahead with testing transistor mosfet on the heatsink...

[petehall347]

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 ?

[labello]

is it possible the input is too hot ?
do any vol controls work ?

Hi that's right! But if can't find what cause this problem, I mean I already checked all of transistor out of circuit with a peak meter and those are good... So what components can cause the resistor getting hot! There's schematic board for this model? Or it's too holder?? Thanks all of you foto the reply

[labello]

Guys I just received the thermal camera, finally I've been waiting for a month. Anyway there's something that get really hot!! See Guys

[labello]

is it possible the input is too hot ?
do any vol controls work ?

Hi, I really don't know, I only change a little capacitor (blown up) and a resistor (a little big than the original one) in the front pannel I replaced the little bottoms (on off) ..

[labello]

maybe something is wrong with the volume knob itself?

Hi, at the front pannel anything control volume or mixer work, except the large bottom on/off

[petehall347]

is it possible the input is too hot ?
do any vol controls work ?

[CapLeaker]

Yes I can't , i turn the bottom down but it still very high

maybe something is wrong with the volume knob itself?

[labello]

What do you mean? You can't turn down the volume?

Yes I can't , i turn the bottom down but it still very high

[CapLeaker]

Hi the problem is when the amplifier turn on the volume is very heavy I tried to turn it down but it remains higher. Thank you

What do you mean? You can't turn down the volume?

[labello]

Nah, don't bother. It will work just fine. UNLESS the new ones are smaller (different wattage rating).

Hi the problem is when the amplifier turn on the volume is very heavy I tried to turn it down but it remains higher. Thank you

[petehall347]

resistors dont burn for no reason

[labello]

you need to see how many transistors are damaged and replace or you will keep burning up resistors .

Thanks man I will check you can be sure but the amplifier was okay..

[petehall347]

you need to see how many transistors are damaged and replace or you will keep burning up resistors .