Bottlehead Forum

Bottlehead Kits => Mainline => Topic started by: Happy Ghost on September 16, 2023, 04:08:18 PM

Title: Mainline voltage check failed [resolved]
Post by: Happy Ghost on September 16, 2023, 04:08:18 PM

Hello All,

Can someone help me debug Breg voltage problem I am facing. So I passed all the resistance checks. Nothing remarkable except that terminals 19 and 30 read steady at 215.4 Kilo ohms and 208.8 kilo ohms. But after powering up first thing i noticed is that the LED's on the B-side of the C4S board connected to C-socket do not light up. All my voltages seems to be in spec (on a 120VAC connection) except for B-reg regulator board. These are the values I am reading.

+275VDC on Power Supply Board      274.7V
+6.3VDC on power supply board        57.7V
-6.3VDC on the power supply board    51.5V

IA on the A-side C4S board                274.3V
IA on the B side C4S Board                274.1V

Breg Regulator board:                       216V (A-side), 156.3V (B-side)

-reg regulator board                          0V both side

Kreg regulator board                         9.88V and 11.34V

I have posted some build pics also.

Thanks in advance!

Title: Re: Mainline voltage check failed
Post by: Paul Birkeland on September 16, 2023, 06:30:28 PM

OA should not be wired to OB on the high current C4S board.

Title: Re: Mainline voltage check failed
Post by: Happy Ghost on September 17, 2023, 03:31:12 PM

Quote from: Paul Birkeland on September 16, 2023, 06:30:28 PM

OA should not be wired to OB on the high current C4S board.

dang! this was such a blunder from my part .. careless  :'(

thank you for pointing this straight away PB! after fixing the glitch, everything is in spec now.. it is running now and sounding very good.. thank you once again!

Title: Re: Mainline voltage check failed [resolved]
Post by: Paul Birkeland on September 17, 2023, 06:47:49 PM

An easy fix is a good fix.