Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: nmatlin on March 19, 2024, 05:06:31 AM

Title: Speedball LED/Voltages [resolved]
Post by: nmatlin on March 19, 2024, 05:06:31 AM

Hi folks,

I'm just finishing up my Speedball upgrade to Crack. Everything has checked out, except when I do my last voltage check, the two LEDs closest to the power transformer on the large board do not light. Voltages, then, on OA and OB are in the 120V range and B+ is around 200V... so a bit too high. Any suggestions on where to look?

best,

Nick

Title: Re: Speedball LED/Voltages
Post by: Paul Birkeland on March 19, 2024, 05:42:14 AM

What are all the voltages on all the PC boards?

Title: Re: Speedball LED/Voltages
Post by: nmatlin on March 20, 2024, 09:16:44 AM

Hi Paul,

On the small board, the voltages are as follows:

IA: 202
OA: 73
IB: 201
OB: 72
B-A-B: 0

The big board voltages (I tested again):
OB: 127
OA: 114
G (predictably): 0

Thank you!

Nick

Title: Re: Speedball LED/Voltages
Post by: nmatlin on March 20, 2024, 10:08:11 AM

I found the problem:  I failed to solder one hole around the large resistor. Now it’s all good!

Thanks all!

Nick