Author Topic: SL676E fader help. No volume unless at 100%  (Read 1069 times)

jwhmca

  • Full Member
  • ***
  • Posts: 134
  • Karma: +4/-0
SL676E fader help. No volume unless at 100%
« on: December 31, 2021, 08:48:15 PM »
First, does this symptom make sense or has anyone seen this? Second, is there a schematic for the fader someplace?
"It's all about being a servant."

murphster_matt

  • Newbie
  • *
  • Posts: 11
  • Karma: +0/-0
    • Germany
Re: SL676E fader help. No volume unless at 100%
« Reply #1 on: January 07, 2022, 05:32:02 PM »
Hey 👋

Swap out with another fader, if the problem persists it could be your VCA and not the fader. If the problem disappears then take the faulty fader and use a dmm (ohms) on pins 1 & 4 (If I recall correctly) move the fader and see if you have a change in resistance (nearly 0 to approx 2,4kohm). If not then check the wiring of the fader, and if your wiper is sitting properly on the tracks.

There is a schematic in the G Series service manual (if u don’t have it also available through the doc pages in the forum)

All the best!

Matt

jwhmca

  • Full Member
  • ***
  • Posts: 134
  • Karma: +4/-0
Re: SL676E fader help. No volume unless at 100%
« Reply #2 on: January 18, 2022, 05:36:26 PM »
I have swapped the fader. The problem follows the fader. The resistance changes normally when slid back and forth.
"It's all about being a servant."

amillar

  • Full Member
  • ***
  • Posts: 181
  • Karma: +15/-0
    • United Kingdom
Re: SL676E fader help. No volume unless at 100%
« Reply #3 on: January 18, 2022, 08:19:14 PM »
Hi,

Just checking, are you seeing the correct resistance change between pins 1 and 4 AND between pins 1 and 2? (i.e. one going up as the other goes down?)

Also make sure the problem moves with the fader, not with the 10 way ribbon cable?

There's not much else that can go wrong with this!

Thanks,

Andy


co-designer and project manager G series analogue 1987
channel strip designer J series 1992-93
design "caretaker" 4000/6000 1985-93
analogue team leader ARC/Bertha 1988-92