mods to Mackie 1604

[Guest]

Archived from groups: rec.audio.tech (More info?)

hi Group

i am hoping someone can help me modify a 1604 to change
Auxs 3 & 4 from post Fade to pre Eq.

have obtained a pdf via google giving 'cut track & insert link'
instructions for Auxs 1 & 2 to be moved from post Eq to
pre Eq. Identifying the signal path on the pcb underside does
give a few clues. i.e., point B is post Eq and C is
pre Eq / feed to Auxs 1 & 2

A & D seem to be in the input normally connected but are
obviously marked for further track cutting mods (rather than
purely as probing points).

E & F are around the area of Auxs 3 & 4 and it seems there's
a chance they are marked for mods along the lines that i require

could someone please help with mod instructions along these
lines? Alternatively, a cct. would probably do it. This would
save a lot of time and mucking about (pulling the board out etc..).

tia

 

[Guest]

Archived from groups: rec.audio.tech (More info?)

"stek" wrote..

[...]

> could someone please help with mod instructions along these
> lines? Alternatively, a cct. would probably do it. This would
> save a lot of time and mucking about (pulling the board out etc..).
>


Took a bit of hunting around but there is a little mod sheet released by
Mackie for this mod. Those other designations on the pcb underside are for
modifying in exactly the way required.


Pre Eq >----[F]------[x][C]----> Aux 1+2

Post Eq >---------> Fader

Fader >------[D][x]-----> Aux 3/5

Fader >------[E][x]-----> Aux 4/6

Fader >------[A][x]-----> Direct Out


So.. to obtain pre-Eq to all Aux's, cut the link at D and E and link
both 'load side' points of the cuts to F

If any one would like the 260K pdf, i'll send it

cheers

 

[vern]

Archived from groups: rec.audio.tech (More info?)

solidac Wrote:
> "stek" wrote..
>
> [...]
> -
> could someone please help with mod instructions along these
> lines? Alternatively, a cct. would probably do it. This would
> save a lot of time and mucking about (pulling the board out etc..).
> -
>
>
> Took a bit of hunting around but there is a little mod sheet released
> by
> Mackie for this mod. Those other designations on the pcb underside are
> for
> modifying in exactly the way required.
>
>
> Pre Eq ----[F]------[x][C]---- Aux 1+2
>
> Post Eq --------- Fader
>
> Fader ------[D][x]----- Aux 3/5
>
> Fader ------[E][x]----- Aux 4/6
>
> Fader ------[A][x]----- Direct Out
>
>
> So.. to obtain pre-Eq to all Aux's, cut the link at D and E and link
> both 'load side' points of the cuts to F
>
> If any one would like the 260K pdf, i'll send it
>
> cheers



Just wondering if You could send me the pdf?

Thanks,
Joel


--
vern