Bottlehead Forum

Bottlehead Kits => Mainline => Topic started by: ideal.hat on October 20, 2018, 02:46:43 AM

Title: Mainline Voltage issues and 2 LEDs do not light up. [resolved]
Post by: ideal.hat on October 20, 2018, 02:46:43 AM

Hello there.

Edited: to include mode readings.

I have finished putting together my Mainline kit but I am having some issues.

I am in Denmark on 230v

The Mainline passed the Resistance check. All readings were fine there.

Here is the voltage check results, and they do not seem to be correct.
+275vDC =268
+6,3vDC =6,26
IA A Side = 265
IA B Side = 266
IB A 149
IB B 260
breg - A=263v B=148v
-Reg - A=0v B=1,89v
kreg - A=1,89v B=19,1v

The 2x B LEDs on side A do not light up,
Does anyone have an idea on what might be the issue here.

Title: Re: Mainline Voltage issues and 4 LEDs to not light up.
Post by: ideal.hat on October 20, 2018, 02:47:58 AM

Here are some pictures

Title: Re: Mainline Voltage issues and 4 LEDs to not light up.
Post by: ideal.hat on October 20, 2018, 03:00:27 AM

Its not going to well to upload pictures to this thread.

Maybe the are too large 7-8mb each.

You can see more pictures here.
https://www.flickr.com/photos/28459414@N08/albums/72157701081341541

Title: Re: Mainline Voltage issues and 2 LEDs do not light up.
Post by: Paul Birkeland on October 20, 2018, 05:39:57 AM

Quote from: elgringo81 on October 20, 2018, 02:46:43 AM

-Reg - A=0v B=1,89v

This jumped out rather immediately.  The -reg pads on each board are wired together.  It wouldn't be that weird to see 0V on one and 1.89mV on the other, but if you have 1.89V at -regB, then there's an issue with the ground jumpers on that board.

Quote from: elgringo81 on October 20, 2018, 02:46:43 AM

IB A 149
IB B 260
kreg - A=1,89v B=19,1v

What's interesting here is that neither high voltage regulator is working.  Inspecting your work, the wiring of B8 and B3 is incorrect. A black jumper on the bottom side of the PCB also looks to not quite be in the right place.

-PB

Title: Re: Mainline Voltage issues and 2 LEDs do not light up.
Post by: ideal.hat on October 20, 2018, 07:50:22 AM

You are right on the money...
 
I corrected B1 and B3 and the jumper so now all the light show up and the currect reading are acceptable

+275vDC =263
+6,3vDC = 6,26
breg - A=219 B= 218
-Reg - A=0 B=0
kreg - A=11,5 B=11,2

I have set the bias to 145v on bot A and B and I am getting sound.


I have come across a new issue which I will create a now post about. I am dealing with channel imbalance.

Thank you very much for you assistance on this case.