Quad clone,output 30v,need help.

[SHARMAN]

dear all
i have a problem in my clone QUAD606,the OUtput is about +25V when supply voltage is +-40V,from the schematic i think the point A is about 0V,
is anyone know how did the QUAD606 working(from the schematic) for output near 0V.and who can help me to slove the clone problem.thanks a lot.
i use the transformer like below

 

[analog_sa]

You probably have a wiring error. What are the voltages at the input and output of the servo?

 

[Blue]

the whole picture

The daiagram appears to be missing a vital part --- The PSU --- did you also correctly "clone" the PSU especially the active ground offset balance T15 and T16 ???

Blue (in from the windy city)

 

[amplifierguru]

You must halt production. Clone is missing DNA.

Greg

 

[ele-tube]

You could test others nodes voltage such as marked in the schematic.

 

[SHARMAN]

i did the correctly wring and use active ground powersupply,output is still in high DC leveL,I want to confirm is anyone who has the experience in QUAD equipment,How is the QUAD606 output can located in 0V.

 

[405man]

Did the amp ever work or has it always been faulty

Stuart

 

[jan.didden]

dear all
i have a problem in my clone QUAD606,the OUtput is about +25V when supply voltage is +-40V,from the schematic i think the point A is about 0V,
is anyone know how did the QUAD606 working(from the schematic) for output near 0V.and who can help me to slove the clone problem.thanks a lot.
i use the transformer like below

Which is the point that is at 25V? I see only two 0V points in your schematic.

Jan Diddden

 

[SHARMAN]

janneman,
The pointA normal is about 0V ,but my clone in pointA is about +25V,i have no idea.

 

[jan.didden]

janneman,
The pointA normal is about 0V ,but my clone in pointA is about +25V,i have no idea.

OK, I assume that the other '0V' point in the drawing is also at +25V?
The best way to trouble shoot this is working backwards from point A (leftwards) and measure the terminal voltages of the transistors as shown in the schematic. And don't assume that your wiring is correct. It is very difficult to spot wiring problems if you did it yourself. Unless a component is broken, it is a wiring error. There are no more flavors...

Keep us posted.

Jan Didden

 

[TonyTecson]

a +25 volts at the output means there is a transistor(maybe reverse connected) that returns to the negative rail, you can check in that direction.

 

[eeraudio]

I can help you fine the trouble just post sa pcb cmponent side let us see whats the problem,

 

[Ian Finch]

You're about 10 years too late with that kind offer, eeraudio