Speedball 1.1 large board voltages

[dkazakoff]

TLDR:
Speedball 1.1 large board voltages out of bounds and 2 leds do not light up:

LEDs nearest Q1A do not light up.

Also, my voltages from the large board voltage check:
OA 1.45
OB 115
G 0V
B+ 195V
--------------------
From the manual I understand these should be:
OA 75-100V
OB 75-100V
G 0V
B+ 170-195V
--------------------
Long version:
Starting with a functioning Crack, followed the Speedball through to installation of the small board first, stopped at "You can resume use of your Crack at this time and listen to the benefits of the upgrade, or you can continue and complete the second half of the kit." Used it for a while, sounds great, all measurements within bounds.

Assembled the Large board. Removed the 2 Crack build 3KΩ 10W resistors, installed the board. Resistance check was inconclusive, my multimeter showed OL on OA and OB. So I removed the large board and reinstalled the 3KΩ 10W resistors. Retested. All checks passed, and I used the amp for a while.

Made another attempt this time assuming that OL means infinite resistance and therefore assuming the resistance checks passed. Moving on to the voltage checks, I noticed the leds were not lighting up and the voltages are incorrect.

Thanks for your help!

 

[Paul Birkeland]

The 3K resistance that you attempt to measure with the Speedball installed will not measure 3K because you've removed the 3K resistors from the amp.

Can you post some build photos of the larger Speedball board?

 

[dkazakoff]

 

[dkazakoff]

My concern is that
OA measures 1.45V when it should be 75-100V
and OB measures 115V when it should be 100V max

oh yeah and that 2 LEDs dont light up

 

[Paul Birkeland]

You'll want to turn the heat on your soldering iron all the way up. If you have one of those little blue Hakko stations, it's easy to think you're turning up the heat when you're actually adjusting the calibration. Also be sure you have 60/40 rosin core leaded solder.

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I suspect with proper reheating of the solder joints on that board that it will work properly.

 

[dkazakoff]

Ok will do thanks!

 

[dkazakoff]

Yep, I needed to calibrate the iron, it was way off. I honestly didn't know that was a thing. I'll need to reheat the crack joins as well. Thanks!

 

[Jameson]

It happens often enough that we’re considering making “Make sure you’re setting the temperature and not adjusting the calibration” our company slogan

 

[Doc B]

Your photos are awesome.