Roland Cube 30x, 2008

[N_Cook]

Phones/rec out socket. It is implied in the user manual but can anyone
verify from experience, more exact details.
1/4 inch socket with 2 isolated switch actions (Jalco). For phones, ie
stereo plug, the speaker is fully muted, via control logic , not carrying
speaker
current.
For rec out , mono plug (explicitly stated in the user manual), then speaker
is attenuated, by a fixed amount ?, but not muted like the stereo plug
situation.

 

[N_Cook]

The innermost "phones" switch does pass the speaker current, the outer one
goes via 1K to somewhere. So the mystery deepens.
Previous cube, different model "30 bass", triggering the outermost switch
only , by plastic rod inserted thru the sw , dropped the speaker volume to
10 percent or so of whatever the volume was set at.

 

[N_Cook]

Service manual on elektrotanya just describes the test function. Triggering
one phones socket sw, triggered in isolation, cuts the speaker ; the other
,triggered in isolation, attenuates marginally from eg 1.58V ac over speaker
to 1.2 V . But in normal use , the speaker cut sw takes precedence and both
stereo and mono jacks cut the speaker.
Now I've replaced the socket, foreign object landed insid and then rear of
the Jalco got mangled and pushed out

 

[Meat Plow]

On Tue, 05 Jul 2011 11:35:30 +0100, N_Cook wrote:

Service manual on elektrotanya just describes the test function.
Triggering one phones socket sw, triggered in isolation, cuts the
speaker ; the other ,triggered in isolation, attenuates marginally from
eg 1.58V ac over speaker to 1.2 V . But in normal use , the speaker cut
sw takes precedence and both stereo and mono jacks cut the speaker. Now
I've replaced the socket, foreign object landed insid and then rear of
the Jalco got mangled and pushed out

I've seen that several times. (broken jalco backside)



--
Live Fast Die Young, Leave A Pretty Corpse

 

[N_Cook]

Meat Plow <mhywattt@yahoo.com> wrote in message
news:4qvd6k.csp.19.5@news.alt.net...

On Tue, 05 Jul 2011 11:35:30 +0100, N_Cook wrote:

Service manual on elektrotanya just describes the test function.
Triggering one phones socket sw, triggered in isolation, cuts the
speaker ; the other ,triggered in isolation, attenuates marginally from
eg 1.58V ac over speaker to 1.2 V . But in normal use , the speaker cut
sw takes precedence and both stereo and mono jacks cut the speaker. Now
I've replaced the socket, foreign object landed insid and then rear of
the Jalco got mangled and pushed out

I've seen that several times. (broken jalco backside)



--
Live Fast Die Young, Leave A Pretty Corpse

Just 2x mm-size plastic pawls hold the white rear in the black body. Maplin
and RS no longer stock them , I wonder why - I gave up hunting for uk
supplier. Standard 1/4 in stereo socket melded to 2 ultra-miniature spdt
microswitches is now in there, far more robust.