Speedball LED/Voltages [resolved]

nmatlin · 4419

« previous next »
Pages: 1   Go Down

0 Members and 1 Guest are viewing this topic.

Offline nmatlin

  • Jr. Member
  • **
    • Posts: 10
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
« Last Edit: March 20, 2024, 03:37:29 PM by Paul Birkeland »


Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19774
Reply #1 on: March 19, 2024, 05:42:14 AM
What are all the voltages on all the PC boards?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline nmatlin

  • Jr. Member
  • **
    • Posts: 10
Reply #2 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


Offline nmatlin

  • Jr. Member
  • **
    • Posts: 10
Reply #3 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


Pages: 1   Go Up
« previous next »