The MS200 Remote Control

Duncan Chisholm (y6jb8@unb.ca)

MS200 Remote Control    After a few weeks of owning my new MS200 I was very tired of titling my music using the little volume up/down buttons, and actually a little concerned that these buttons might wear out with the heavy use I was making of them.  I figured that if the Sharp portables used a remote control scheme similar to the Sony units (i.e. switching different resistances for each function) and if the recorder had support for buttons on the remote control that weren't present on my particular remote (especially ENTER and CHARACTER/TIME), then it wouldn't be too difficult to build a computer titling system similar to the infrared ones made for minidisk decks.  After doing a little investigating, I had to conclude that this wouldn't really be a practical way of titling minidisks after all, mostly because Sharp portables don't seem to have as many functions available (or potentially available) as the Sony portables do.  So, presented here is the information I collected before giving up on the project.  I hope someone can make use of it.

    Although I don't think a computer titler would be very useful, especially because of the lack of a remote ENTER button, I'm considering building an enhanced remote control with a jog dial to make manually titling minidisks a little less painful and time consuming.  If anyone has any suggestions for this, please let me know!
 
 

Sharp Remote Control Plug
MS200 Remote Control Connections
Contact Number
Wire Colour
Plug Position
Function
1
White
Inside Ex. Ring
Switch Control
2
Black
Ring 1
GND
3
Yellow
Ring 2
Audio GND
4
Red
Ring 3
Right Channel
5
Green
Tip
Left Channel
6
(unused)
Outside Ex. Ring
LCD Display
The "Contact Number" used here is the number silk-screened on the MS200's circuit board.

 

 
MS200 Remote Control Schematic (AD-MS20RM)

White ---/\/\/---/\/\/--/\/\/---/\/\/---/\/\/---/\/\/---/\/\/---/\/\/---/\/\/--- 
         1.8K  | 2.2K   2.7K  | 3.3K  | 3.9K  | 4.7K  | 6.8K  | 10.0K | 180K    | 
               |              |       |       |       |       |       |         | 
             Play           Stop   Forward  Back   Vol.Up  Vol.Dwn  Bass        | 
               |              |       |       |       |       |       |         | 
Black -------------------------------------------------------------------------- 
MS200 Remote Control Resistor Values
Function
Remote Resistance
Total Resistance
Play
1.8K
1.8K
Stop
4.9K
6.7K
Forward
3.3K
10K
Back
3.9K
13.9K
Volume Up
4.7K
18.6K
Volume Down
6.8K
25.4K
Bass/Track Mark
10K
35.4K
Display*
~15K
~50K
Mode*
~20K
~70K
(More functions?)
?
?
None (standby)
180K
215.4K+
*These functions aren't present on the standard MS200 remote control; I managed to discover them with a little experimentation. 
Remote Resistance is the resistor value found in the remote control.  Total Resistance is the resistance as "seen" by the MS200. 
 
Page created and maintained by duncan.chisholm@unb.ca

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