Stage Line 500W amp repair project

[WHONOES]

View attachment 50548 would this be correct, dont normally use this function on this meter, it has lots of setting but there is only a few i need to use,
Pete

If that reading is just for the O/P stage then that is fine. Just need to check the other channel now.

 

[bikemech]

If that reading is just for the O/P stage then that is fine. Just need to check the other channel now.

The same way? , just across the positave fuse connections for the left chanel ?

 

[bikemech]

If that reading is just for the O/P stage then that is fine. Just need to check the other channel now.

O/P?? Is that short for output?

 

[bertus]

Hello,

Yes, O/P is output, I/P is input.

Bertus

 

[bikemech]

IMHO I think you would be better off with this Mds-3200a dds nc dual channel function signal generator frequency meter ttl wave Sale - Banggood.com Sig' Gen'. As it is a bit more future proof.
And the following Scope Hanmatek DOS1102 Digital oscilloscope with 2 Channels and Screen 7 inch / 18 cm, TFT-LCD Display, Portable Professional Oscilloscope Kit with 110mhz Bandwidth 1GS/s Sampling Rate: Amazon.co.uk: Business, Industry & Science.
More expensive than the one previously suggested. The last thing you want to be doing is to buy a cheap device only to discover it's not up to scratch and you find yourself buying the one you should have bought at first. It's irksome and wastes money.

I do t mind spending the exrea if its going to be better in the long run, as i do plan on dooing more projects once i get to grips with all the kit

 

[bikemech]

Hello,

Yes, O/P is output, I/P is input.

Bertus

Its tricky when people say O/P, some people mean the output transistors and some mean the actual final output of the amplifier

 

[WHONOES]

Just to clarify, If I say O/P it means the actual Power Amp' output. If I mean Output Transistors I will say O/P transistors or I might say O/P stage. I/P has been clarified elsewhere.

 

[WHONOES]

I do t mind spending the exrea if its going to be better in the long run, as i do plan on dooing more projects once i get to grips with all the kit

Good on you. Being prepared to listen and learn is vital. It enables you to sit on the shoulders of those with experience that have gone before and gain the benefit of their knowledge.

 

[bikemech]

Ok, here is the readings for left and right chanel, taken across the + fuse holder with the fuse removed, also switched the meter to MA

 

[WHONOES]

They look Ok.
Time to try them out one at a time.
Ideally you should check them out with your Scope and Sig' Gen' using a high power resistor for the load. This is mine.

 

[bikemech]

Is it a case of waiting for the scope and sig gen now then ? ,

Sure i had a few resistors like that to slow motorcycle indicators down when they got changed to LED ones

 

[WHONOES]

If you have the patience to do so then yes.

 

[bikemech]

Will the smaller scope work to get this working again that @bertus mentioned ?, i can always upgrade later @WHONOES ?

 

[bertus]

Hello,

When you want to look at a good distributer, have a look at Farnell.
They have about 80 models upto 18000 pounds.
(I do not know how deep you pockets are)

https://uk.farnell.com/w/c/test-mea...-in-stock|exc-delivery-surcharge&sort=P_PRICE

Bertus

 

[bikemech]

Hello,

When you want to look at a good distributer, have a look at Farnell.
They have about 80 models upto 18000 pounds.
(I do not know how deep you pockets are)

https://uk.farnell.com/w/c/test-mea...-in-stock|exc-delivery-surcharge&sort=P_PRICE

Bertus

Right now, not very lol

 

[WHONOES]

I agree with Bertus. Farnell is a very good place to start.
As an after thought, you could start with a virtual Scope. That is a software download that lest you use your audio card as a Scope. Some come with Sig' Gen' software as well.
Google "Virtual Oscilloscope". Could be useful to get you going.

 

[WHONOES]

Further to post #476. Ideally you would use it on a Laptop as it would be electrically floating.

 

[bikemech]

Further to post #476. Ideally you would use it on a Laptop as it would be electrically floating.

I will have a look at that, thanks

 

[bertus]

Hello,

Here is a circuit to use with the PCSCOPE.
It comes from post #5 of this thread on AAC:
https://forum.allaboutcircuits.com/threads/pc-oscope.12149/


Bertus

 

[bikemech]

Could this work ? , got it from here no 3

https://www.google.co.uk/amp/s/windowsreport.com/oscilloscope-software-pc-laptop/?amp