Introduction
The RM-MZR30MP remote control is a cable remote control for Sony MiniDisc portables. It connects to the portable unit, such as the MZ-R30, using a plug that both connects with the mini-jack stereo connector, as well as Sony's proprietary 4-pin remote control connector. The remote control has a coaxial output for Sony proprietary coaxial headphone plugs.There are several reasons why you would want to make changes to this remote control thing, but mostly just because Sony has made a very clumsy design:
- You cannot plug a normal mini-jack into the remote.
- You cannot plig a normal mini-jack into the MZ-R30, when you are using the remote.
- You cannot clip the remote on your belt, or shorts, because the accompanying headphone cable with coaxial plug is too short to reach. The remote seems to be designed to be clipped on your blouse pocket. What if I'm wearing a pocketless T-shirt??
- You would like to use headphones other than the Sony ones, and those usually don't come with that coaxial plug. I still have to find a miniature mini-jack that I can replace the coaxial connector with. Note that there's a short cable available, that converts coaxial to mini-jack. Sony's model number is PC-MP1HG.
- You would like to enhance the remote control to add extra features, such as a record button.
- You would like to design your own remote control.
When no button is pressed, the resistance is
unlimited (i.e. open switch). The hold button is merely an extra switch
(S101) that ensures the other switches have no effect.
The rest of the remote controls buttons is connected in a resistor
network (R101-R111), providing a relatively large number of functions with a
relatively low number of resistors.
Here are some quick schematics I drew. Hope my scribbling is somewhat
readable; I will eventually draw it with some decent software.
Other res mistor values, as found by Andy James <[email protected]>.
These are not present in the RM-MZR30MP remote control, but which are
understood by the MZ-R30. WARNING: Use on your own risk!
Details to come later. Please see the
MiniDisc Community Page for more info on remotes.
If you have any further questions or suggestions, ask me. I'll also be
following the MiniDisc Mailing List.
Minidisc® is a registered trademark of Sony Corporation.
Schematics
Remote control commands are issued by switching a resistance between
two of the remote control pins (pin 2 and 4). The value of the resistance determines
what function is issued.
Resistor Table
This table shows each of the resistor values, which resistors are used by
which functions, and the resulting total resistance for each function.
function R total R101 R102 R103 R104 R105 R106 R107 R108 R109 R110 R111
[Ohms] 1000 1300 1300 27 1500 56 1800 150 1500 1500 2000
Prev/Back 1000 1000
Next/Forward 3627 1000 1300 1300 27
Pause 5156 1000 1300 1300 1500 56
Stop 7050 1000 1300 1300 1500 1800 150
Volume - 8400 1000 1300 1300 1500 1800 1500
Volume + 9900 1000 1300 1300 1500 1800 1500 1500
Track Mark 11900 1000 1300 1300 1500 1800 1500 1500 2000
function R total
[Ohms]
Mode 14000
Display 17000
Record 19500
Test Mode 24000
Questions
Regards,
Leon Woestenberg <[email protected]>.