# Z-2300 Generic Logitech Control Pod Help

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#### Jaco2017

##### New Member
Please consider reviewing my Interpretation of this generic control pod diagram, to help me out in understanding the workings of this circuits.

I'm new to these electronic circuits, and this might be my first time trying to understand an electronics curcuit diagram.

I have broken the working circuit into three stages and sections, to help break up this information up for reading comprehension, and handling.

Anything italicized Im not sure about and would like confirmation of
and if there is any part i am mistaken in, please explain the difference to me.

I would like to make a tutorial or thread, explaining to other people like myself, how these things work, so that contemporaries in this matter will have more resources to help repair our units, for replacing components or controllers, and this thread might help other owners and perspective owners out.

Also, I'm working on developing a solution myself to share with people, but at this stage i could use help of the community.

here is a sister thread for reference

So, return of the Z' electro tech online!

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#### Jaco2017

##### New Member
Stage 1

Section 1: Power Management Stage

power negative comes into control pod from pin 4

power positive comes into control pod from pin 5

power negative is ground to pcb/chassis

power negative runs to a 10.2k resistor

power negative set to led negative terminal

power positive is split
• to run to the led
and
• to the on and off switch

negative connects back to power ground pin 4 I assume

power positive is run from the switch to pin 15

Section 1 Questions

1.
Are the capitators, labled as optional, actually required for safety?
and are these components used for "capacitative coupling"?
https://en.wikipedia.org/wiki/Capacitive_coupling

2.
what do they mean by pot sw?
switch?
if so, I thought the switch was before this point, in order to turn off the led?

3.
is the power split/divided between led and and power switch?

4.
shouldn't the ground be connected to the on and off switch?
and if so
• why is ground not shown as connected to the on and off switch,
• is it simply not connected to the on/off switch?

#### Jaco2017

##### New Member
Stage 2

Path 1 section 2 Solution: Audio signals line in, channel volume control, amplifier accommodation, and line out

left and right audio signals, negative and positive, line into control pod
• from the 3.5mm plug connection

negative is ground to chassis and/or pcb and shield?

negative signal is split to left and right

left negative signal goes to 0.01uf capacitor (104k)
right negative signal goes to 0.01uf capacitor (104k)
• these might not be the correct figures.. but should be good enough?
• This is consistent with a third party replacement control pod i have disassembled.

left negative signal is connected the negative post of a dual-unit logarithmic potentiometer's negative left channel
∘ Alps 688-RK09712200MC
right negative signal is connected to the negative post of the dual unit logarithmic potentiometer's negative right channel

left positive signal is connected to the positive post of the dual unit logarithmic potentiometer' positive left channel
right positive signal is connected to the positive post of the dual unit logarithmic potentiometer' positive right channel

negative signal is tied back to common/ground

common negative signal is then sent to pin 3 of the control pod line-out

left positive signal is connected to pin 12 of the control pod line-out

right positive signal is connected to pin 6 of the control pod line-out

lines from the control pod line-out are sent to the active-preamplifier section

Section 2: Questions

1.
why does it look like negative signals are connected from ground to the positive signals after exiting the capacitator?
• is this the case?
• or what does the diagram properly read as?

2.
is the dual unit potentiometer ALPS 10k(total) (5k per channel?) or (10k per channel?) potentiometer?
is total resisitence declaration meaning total resistence per channel?
http://www.mouser.com/ProductDetail/ALPS/RK09712200MC/?qs=fQ8kcZGzY5Wzud3OJDlECg==

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#### Jaco2017

##### New Member
Stage 3

Section 3: back to control pod, for headphone or subwoofer functionality

a common negative signal comes back out of pin 3

common negative is again grounded to pcb/chassis

common negative signal is connected to a 3.5mm plug-switch's common negative in-post
• STX3100-334726
left positive signal is sent to the headphone switch's positive left positive in-post
right positive signal is sent to the headphone switch's positive right positive in-post

Path 1 section 3A: If the switch is set to headphone, the headphone story

from the 3.5mm audio switch

the common(shared) negative signal is tied to a shared common negative post of the jack's headphone section

left positive signal is run to a 33ohm resistor
right positive signal is run to a 33ohm resistor

left postive signal is set to the left positive terminal of the jack's headphone section
right postive signal is set to the right positive terminal of the jack's headphone section

this is the end of the headphone story

Section 3A Questions

1.
Why is negative signal not also run to 33ohm resistors, to mirror positive signal handling?

Section 3B: if the switch is not set to headphones, subwoofer attenuation story

The common negative signal is sent to a 4k resistor

left positive signal is sent to a 2.85k resistor
right positive signal is sent to a 2.85k resistor

negative signal is tied to the negative post(s) of a dual unit linear 10k potentiometer
• Alps RK09712200MC

positive signals are joined together to common-common positive

common positive signals are split

positive common signal is connected to positive post of dual unit left linear

a negative signale is tied from potentiometer negative line out to the pcb ground

a positive common signal enters a 3.62kohm resistor

negative signal set to a 591ohm resistor

positive and negative are joined together before exiting to pin 1 to amp power amp section??

negative is connected back to pin 3 signal negative

Section 3B Questions

1.
does negative connect to positive, or how is the diagram correctly read?

2.
is the ALPS 10k(total) potentiometer 5k total per channel?) or 10k total per per channel
i dont understand their meaning of total.
http://www.alps.com/prod/info/E/HTML/Potentiometer/RotaryPotentiometers/RK097/RK0971221Z05.htm
∘ RK09712200MC

3.
is positive common mode made before entering the dual gang potentiometer, or by way of the potentiometer (in it)?

4.
is this dual-unit a 6 pin, two channel potentiometer, or a single channel potentiometer?
http://www.alps.com/prod/info/E/HTML/Potentiometer/RotaryPotentiometers/RK097/RK09712200MC.html
for example if this is a 6 pin potentiometer, then the comon positive is split before connecting to the left and right channels of the potentiometer
and then common positive is rejoined afterÉ
or by the unit itself

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