Complete Novice Needs Help

[richluvsound]

first one is ready ! Left Channel

 

[Bill Fuss]

R1, R8, and R8-1 should be omitted unless you have a distortion analyzer.

 

[richluvsound]

Are we talking chassis ground or return ? from black to ground then red to ground. Where do I place the probes ?

 

[Bill Fuss]

Post or send me the voltage readings when you get the chance.

 

[Bill Fuss]

Place the bulb and the meter from the PS return to each plus and minus . The voltage should hold close to 31v under load.

 

[richluvsound]

correct ? and attach the meter to the clips attached to the bulb ?

Just tried to call you .... it makes sense .... !

 

[Bill Fuss]

That looks right, it's hard to tell in the pic. Yes, you want to see the voltage across the bulb.

 

[richluvsound]

left ,

+30.88 v
- 30.93 v

Right ,

+ 30. 64 v
- 30. 68 v

 

[richluvsound]

Thanks

Thanks for all the help Bill

 

[richluvsound]

Fresh Day !

Hi Bill ,

Im going to take the sinks off this morning .... I guess I what I need to find
out is whether the fets are dead or the bit that control them !

Rich

 

[Bill Fuss]

Hi Rich,

That would be a move in the right direction. I doubt the output fets are at fault though. I'm still 98% sure something is amiss in the current source circuitry. Because the components aren't identified on the board your only option is disassembling it and identifying and marking the component locations. C7 needs to be pulled and its value checked also.

 

[richluvsound]

Done , just gonna have a bit of lunch . I will take one board off the sinks and leave the other hooked to test . Ill take photo of the back for you to look at .

 

[richluvsound]

Back Lit !

and find C7 = 6.08 k ohm

 

[Bill Fuss]

In post 32, the second pic from the left, can you take another pic of that area without the shadows.

 

[richluvsound]

both sides !

here ya go !

 

[richluvsound]

this is what I ordered .01uf 50v pps film ech-s .... Digikey reference = PS1H1033G-ND

I ordered these too ... I didnt use them ...WTF ? .047uf 63 v 2% MKP

 

[Bill Fuss]

Hah, that is not the same board. They must have made left and right boards. I have to stare at it for a few minutes. While you are resting, fire up the soldering iron and pull C7 off the board and check its value. Its supposed to be .001uf.

 

[richluvsound]

its confused.... .001uf then .000 uf

 

[Bill Fuss]

Ok, check it for resistance, its probably shorted. And measure the 47k resistor also.

 

[Bill Fuss]

It might also be time to check the batteries in your meter too.