C6 Strings 4 and 8 Tuning issue

FRANK MARIANO · Post by **FRANK MARIANO** » 11 Mar 2022 7:03 am

I have a 2001 D10 Zum that is having a issue with my A Strings. I’m hoping that one of my fellow Zummers can assist.
1) pedal 7 raises String 4 a whole step along with string 3 (standard Emmons)
2) pedal 4 raises String 4 and 8 a whole step
3)Vertical Knee rises String 4 and 8 a half step
4) RL knee lowers 4 and 8 a half.
The guitar says in perfect tune except for the 4th and 8th string, it returns a bit
Flat. The fingers look ok and are resting on the pedal stop from what I can tell
And are all in line and not overturned with the nylon nuts. So my question is
Before I screw something up should I adjust the changer return springs turning
The Phillips screw at the right end plate a bit tighter or looser? Or do you think
It may be something that needs attention. I changed all the strings yesterday
So all new strings. Thanks , Frank

Donny Hinson · Post by **Donny Hinson** » 14 Mar 2022 6:21 am

Did the problem exist before you changed the strings?

Normally, with problem like you describe, it would sound like the lower-return springs need a little more tension. But, it's very rare that this would happen on both of those strings at the same time, which leads me to believe something else is going on...like a cross shaft binding.

Rule #1 is before you go cranking or changing things, verify that everything is moving freely, and that nothing is stuck in the changer.

FRANK MARIANO · Post by **FRANK MARIANO** » 14 Mar 2022 9:20 am

Thanks Donny

J D Sauser · Post by **J D Sauser** » 17 Mar 2022 8:34 am

Donnie is right, and you probably already found out he is.

As a general test, if you flip over your guitar, you should occasionally test your lower string tension using a flat screw driver and actuate the lower scissor (to which the return springs are attached) and let it snap back by sliding the screw driver off. They should snap back resolutely with an audible "clack" at arrival back into "neutral"!
If they don't you need to pull the return spring into more tension with the set screw. On the few guitars this setting is not available (older MSA as and example), you either need to replace the spring or shorten it by cutting a few turns and re-attaching it.

Besides over-tuning, it is the most often found issue.

Tightly held back lower fingers also make for a better sounding guitar!

... J-D.