LEDs not lighting Help Please (solved) New C4S Board

thdewitt · 3358

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Offline thdewitt

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on: January 16, 2015, 07:37:00 AM
OK, so I finally got around to finishing my Bee Pre.  I built pretty much all of the kits.  This one was definitely the most involved.  Everything on the resistance seems to check out fine but the voltages do not.  I am not getting the bottom two LED's to light on the right side CS4.   :'(

(https://dl.dropboxusercontent.com/u/38833957/2015-01-15%2020.37.35.jpg)

I have looked through the instructions and compared to the other side and can't locate the problem.  Any ideas on what I can test to narrow the problem down.

Thanks
Tom
« Last Edit: January 27, 2015, 01:45:53 PM by thdewitt »

Eros Telefunken EF806S and Telefunken E88CC
BeePre JJ 300B
Paramount 1.1 EH 300B
Stereomour JJ 2a3-40 and Mullard CV4024
Crack Tung Sol 5998  Mullard CV 4003
Thorens TD 160 Super (Vinyl Nirvana)
Blumenstein Orca Deluxe/Dungenus Sub
Blumenstein Mako Floorstanders Chocolate Bamboo

Offline Grainger49

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Reply #1 on: January 16, 2015, 07:50:55 AM
Post the voltages that are off.  Also post the expected voltage.


Offline thdewitt

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Reply #2 on: January 19, 2015, 11:18:38 AM
OK, sorry it took so long I have been out for the weekend.  So I am going to just post the voltages that are off since there are so many.

terminal        Correct
10   178.7     186
11  182.5      146
16   0            5
17   181        90-110
22   205        213
25   205        213
29  8.1          6.8
30  8.2          6.8
31  16.3         13.6
34  12.8         13.6
40  209          213
b2  181          90-110
d3  1.9           3.5-4.5
d7   182         147
d9   180         147

Any help would be appreciated.  There is something wrong with the power supply on the right side just can't seem to see it.

Thanks,
Tom

Eros Telefunken EF806S and Telefunken E88CC
BeePre JJ 300B
Paramount 1.1 EH 300B
Stereomour JJ 2a3-40 and Mullard CV4024
Crack Tung Sol 5998  Mullard CV 4003
Thorens TD 160 Super (Vinyl Nirvana)
Blumenstein Orca Deluxe/Dungenus Sub
Blumenstein Mako Floorstanders Chocolate Bamboo

Offline Paul Birkeland

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Reply #3 on: January 19, 2015, 01:52:18 PM
The 300B on that side isn't drawing any filament current, as can be seen by having 0V on terminal 16.  If you have 10V or so at POS OUT on that side, then you should have 10V going into the 300B, passing through the 300B filament, then traveling through the paralleled 8 Ohm resistors.

This could be an issue of an improperly oriented 4 pin socket, or no voltage at POS out.  (Go ahead and measure it)

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline thdewitt

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Reply #4 on: January 19, 2015, 03:10:25 PM
I am getting zero at the positive out.

Tom

Eros Telefunken EF806S and Telefunken E88CC
BeePre JJ 300B
Paramount 1.1 EH 300B
Stereomour JJ 2a3-40 and Mullard CV4024
Crack Tung Sol 5998  Mullard CV 4003
Thorens TD 160 Super (Vinyl Nirvana)
Blumenstein Orca Deluxe/Dungenus Sub
Blumenstein Mako Floorstanders Chocolate Bamboo

Offline Paul Birkeland

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Reply #5 on: January 19, 2015, 04:25:26 PM
How about at positive in?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline thdewitt

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Reply #6 on: January 19, 2015, 04:42:01 PM
OK, I found a broken wire on the positive in.  I replaced that as somehow it had a cut.  Anyway.  The voltages have changed but still no light on the diodes.  Here are the voltages out of whack now.

Terminal    Reading   Correct
 10           173          186
15            175          186
17            127          90-100
22            201          213
25            202          213
40            202          213
43            202          213
46            202          213
b2            132          90-110
d3            7.0           3.5-4.5


Eros Telefunken EF806S and Telefunken E88CC
BeePre JJ 300B
Paramount 1.1 EH 300B
Stereomour JJ 2a3-40 and Mullard CV4024
Crack Tung Sol 5998  Mullard CV 4003
Thorens TD 160 Super (Vinyl Nirvana)
Blumenstein Orca Deluxe/Dungenus Sub
Blumenstein Mako Floorstanders Chocolate Bamboo

Offline Paul Birkeland

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Reply #7 on: January 19, 2015, 04:45:47 PM
What voltage do you have at POS OUT now?  It looks like that 300B still isn't conducting all the way.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline thdewitt

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Reply #8 on: January 19, 2015, 04:47:18 PM
9.79 Volts.

Eros Telefunken EF806S and Telefunken E88CC
BeePre JJ 300B
Paramount 1.1 EH 300B
Stereomour JJ 2a3-40 and Mullard CV4024
Crack Tung Sol 5998  Mullard CV 4003
Thorens TD 160 Super (Vinyl Nirvana)
Blumenstein Orca Deluxe/Dungenus Sub
Blumenstein Mako Floorstanders Chocolate Bamboo

Offline Paul Birkeland

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Reply #9 on: January 19, 2015, 05:21:45 PM
Alright, that's spot on.  Can I get the IA, OA, and OB voltages on the offending channel?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline thdewitt

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Reply #10 on: January 19, 2015, 05:28:16 PM
IA 174.7
OA 130.4
OB 121.8

Thanks so much Tom

Eros Telefunken EF806S and Telefunken E88CC
BeePre JJ 300B
Paramount 1.1 EH 300B
Stereomour JJ 2a3-40 and Mullard CV4024
Crack Tung Sol 5998  Mullard CV 4003
Thorens TD 160 Super (Vinyl Nirvana)
Blumenstein Orca Deluxe/Dungenus Sub
Blumenstein Mako Floorstanders Chocolate Bamboo

Offline Paul Birkeland

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Reply #11 on: January 19, 2015, 05:47:55 PM
Can you switch both the EL84 and the 300B between channels (do them both at once).

Your 300B isn't drawing current, and the shunt regulator is also not regulating properly. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline thdewitt

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Reply #12 on: January 19, 2015, 05:54:18 PM
Pretty much stayed the same

IA 174
OA 127.1
OB 121.8


Tom

Eros Telefunken EF806S and Telefunken E88CC
BeePre JJ 300B
Paramount 1.1 EH 300B
Stereomour JJ 2a3-40 and Mullard CV4024
Crack Tung Sol 5998  Mullard CV 4003
Thorens TD 160 Super (Vinyl Nirvana)
Blumenstein Orca Deluxe/Dungenus Sub
Blumenstein Mako Floorstanders Chocolate Bamboo

Offline thdewitt

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Reply #13 on: January 19, 2015, 05:55:19 PM
I wrote the OB wrong.  IT was 119.5


Eros Telefunken EF806S and Telefunken E88CC
BeePre JJ 300B
Paramount 1.1 EH 300B
Stereomour JJ 2a3-40 and Mullard CV4024
Crack Tung Sol 5998  Mullard CV 4003
Thorens TD 160 Super (Vinyl Nirvana)
Blumenstein Orca Deluxe/Dungenus Sub
Blumenstein Mako Floorstanders Chocolate Bamboo

Offline Paul Birkeland

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Reply #14 on: January 20, 2015, 07:11:37 AM
The next thing I would do is to recheck the IA, OA, and OB voltages with no EL84 plugged into that channel.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

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