Decware ZKIT-1 help needed

[rayma]

That's just the speaker secondary, which is floating, so it does not affect the circuitry,
even if connected backwards.

 

[brandon3212276]

I corrected the violet and white wires, I must have missed that when flipping the PCB the other way. Thanks.

I swapped the output tubes with another set of the same type I had and re-measured.

Socket 1
1= 0
2= 380mv
3= 0
6= 20mv
7= 150mv
8= 0
9= 150mv

Socket 2
1= 0
2= 580mv
3= 0
6= 0
7= 230mv
8=0
9= 230mv

Red/black shows zero DC volts and the red wires bounce between zero and .6vdc. hard to get a solid reading on the red wires.

 

[chrisng]

Red wires should be AC voltage.
Is J1 connected?

 

[brandon3212276]

I do not have the J1 jumper installed, or any other jumper's

I have 320VAC between both red wires and ground. Nothing on black/red

 

[chrisng]

I do not have the J1 jumper installed

This explains why there is no voltage reading on pin 6 of the 6922.
Please connect J1 and measure again.

 

[chrisng]

I do not have the J1 jumper installed, or any other jumper's

A total of 6 jumpers? Looks like we found the culprit...

 

[brandon3212276]

In all fairness to me the instructions didn't say anything about using the jumpers. Gotta figure it out somehow I guess.

I'll make the changes and re-measure when I get home tonight.

 

[vinylkid58]

In all fairness to me the instructions didn't say anything about using the jumpers. Gotta figure it out somehow I guess.

And not shown on the schematic either? Good work Decware.

jeff

 

[rayma]

In all fairness to me the instructions didn't say anything about using the jumpers.

If there are no steps to actually install the jumpers, the directions seem more like suggestions.
Unbelievable.

 

[OldHector]

It looked to me like the two 20uF 250VDC electrolytics are the wrong way round.

 

[brandon3212276]

If there are no steps to actually install the jumpers, the directions seem more like suggestions.
Unbelievable.

I read all the documentation a few times and didn't come across anything. There's no notes on the schematic and nothing jumped out at me unless others can see something I don't.

I build a pair of Bob Latino M125 monoblocks a couple years ago and had zero problems with those. I thought that this would be way easier to get up and running.

 

[vinylkid58]

I read all the documentation a few times and didn't come across anything. There's no notes on the schematic and nothing jumped out at me unless others can see something I don't.

The jumpers are shown on the PCB layout drawing. J1, 2 & 3 are in between the output tubes. J2 & 3 connect the blue OPT leads to the circuit. J4, 5 & 6 are shown at the top and connect the signal inputs.
So without these jumpers, there will be no signal coming in, and the output transformers will not be connected either.

The fact that this isn't documented and shown on the main schem. is pretty much inexcusable.

jeff

 

[brandon3212276]

Ok, jumpers

Shall I install all of them? Forgive me for my inexperience, once things go much beyond the instructions I'm clearly out of my depth.

 

[rayma]

Compare the pcb and the schematic to find out. Probably so, but you have to prove it to yourself.

Unfortunately, even though the jumpers are actually a component, just the same as a resistor,
and have individual reference designators like other components, they are not shown on the schematic.

 

[chrisng]

Yes, you should install all jumpers, it can be installed on either side of the board.

 

[brandon3212276]

Compare the pcb and the schematic to find out. Probably so, but you have to prove it to yourself.

Unfortunately, even though the jumpers are actually a component, just the same as a resistor,
and have individual reference designators like other components, they are not shown on the schematic.

Roger that

I'll give it a detailed look tomorrow night.

Thanks everybody

 

[rayma]

Many boards, audio and elsewhere, have optional jumpers to set gain, etc.
Usually there are instructions for using the jumpers. Not in this case.

Here's an example.
https://www.tubecad.com/2015/04/blog0321.htm

 

[vinylkid58]

Another vote for jumpers. Really doesn't look like it's gonna work without them, and probably the main reason it doesn't now.

Just make sure you have the 120v ac line fused.

jeff

 

[chrisng]

As @vinylkid58 pointed out, the jumpers are shown on the PCB layout drawing. J1, 2 & 3 are in between the output tubes. J2 & 3 connect the blue OPT leads to the circuit. J4, 5 & 6 are shown at the top and connect the signal inputs.
So without these jumpers, there will be no signal coming in, and the output transformers will not be connected either.

Therefore, all jumpers must be installed and can be mounted on the top or bottom of the board.

 

[brandon3212276]

Howdy guys

I just wanted to let everyone know I installed all the jumpers this morning and sure enough it works! It sounds great! Just running on a bedroom the imaging is fantastic.

I'd like to thank everyone here for there helpful advice and patience. It's time to finish the second one and make monoblocks and some chassis.