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Speedball Installation - Wrong voltage small board
Speedball Installation - Wrong voltage small board
RSpies
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RSpies
Newbie
Posts:
2
Speedball Installation - Wrong voltage small board
on:
February 18, 2017, 05:23:24 AM
Hi,
Just started the Speedball upgrade to my Crack and I am not getting the correct voltages when I add the first small board. The Crack was working well before I started so I suspect the problem is with the board or the attachments.
Voltage check showed:
OA 78
IA 147
B-A/B 0
IB 147
OB 136
The LEDs on the left (looking from the volume pot end) glow, but much weaker than the two on the right.
Where should I be looking for the problem?
Thanks
Deluk
Sr. Member
Posts:
440
Re: Speedball Installation - Wrong voltage small board
Reply #1 on:
February 19, 2017, 12:23:45 PM
There are quite a few connections on the board that haven't flowed properly. Should all have a neat little "mountain" with an inverse meniscus. i.e. not a blob. They just need a bit of heat from a properly tinned iron and then just a small amount of solder to reflow them. Can't say which one will cure your problem, maybe none of them, but they need doing. Do the same at the tag strip.
Paul Birkeland
Global Moderator
Hero Member
Posts:
19757
Re: Speedball Installation - Wrong voltage small board
Reply #2 on:
February 19, 2017, 12:31:19 PM
I would agree, more heat, especially on the center legs of those MJE-350's.
Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
RSpies
Newbie
Posts:
2
Re: Speedball Installation - Wrong voltage small board
Reply #3 on:
February 19, 2017, 04:24:22 PM
Thanks, I resoldered some of the connections and it works now. The second and fourth points are now in around 160-161 instead of 170-190. I assume that is close enough not to be concerned. I don't notice any problems listening to it.
Paul Birkeland
Global Moderator
Hero Member
Posts:
19757
Re: Speedball Installation - Wrong voltage small board
Reply #4 on:
February 19, 2017, 07:05:09 PM
Sure, those aren't particularly disturbing. The important voltages are at T1, T5, T7, and T9, with the rest of the high voltage terminals (2, 4, B2, B5, etc) all dropping a bit more than usual as you install each piece of the Speedball.
-PB
Paul "PB" Birkeland
Bottlehead Grunt & The Repro Man
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