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removing_rf_mod_cap

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removing_rf_mod_cap [2019/07/09 18:31]
vik created
removing_rf_mod_cap [2019/07/09 19:22]
vik
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-====== Removing the RF modification ======+====== Removing the RF(capacitor) ​modification ======
  
 From Mid 2018 to Mid 2019 a small capacitor was added to MS2000, RM2000 controllers to reduce RF emissions. When this capacitor fails it grounds the oscillator preventing the microcontroller from running. When this happens controller doesn'​t respond to serial/usb input, joystick, knob and the LCD is blank or full of bars.  From Mid 2018 to Mid 2019 a small capacitor was added to MS2000, RM2000 controllers to reduce RF emissions. When this capacitor fails it grounds the oscillator preventing the microcontroller from running. When this happens controller doesn'​t respond to serial/usb input, joystick, knob and the LCD is blank or full of bars. 
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 === Tools Needed === === Tools Needed ===
 You will need the following tools to complete the repair: ​ You will need the following tools to complete the repair: ​
-* a medium Phillips/​star screwdriver  +  ​* a medium Phillips/​star screwdriver  
-soldering ​iron+  Soldering ​iron 
 + 
 +==== Opening the controller ==== 
 + 
 +First, locate the tools needed to remove the board and a place where electrostatic danger is minimized, either an anti-static mat or a wood surface. 
 + 
 +Second, using the Phillips screwdriver,​ remove the three upper screws that attach the top of the lid, see picture. Then turn the controller over on a small box or a piece of foam to protect the joystick and remove the three lower screws, see picture. Save the screws for reassembly.  
 + 
 +[{{ adept_swap2.png?​direct&​600 |Click to Enlarge}}] 
 + 
 +Some controllers might have an add-on card like the autofocus or crisp system blocking access to the capacitor. Unmount it by unscrewing the four screws holding it in place.  
 + 
 +{{ ::​removing_autofocus.jpg?​direct&​600 |Remove add-on card}} 
 + 
 +Then look for the oscillator Y1, next to it are two capacitors, one white and another mustard color. Remove the white capacitor (refer to the attached picture), you may have to remove the mustard one as well.  
 + 
 +{{ ::​ms2000_fixing_the_cap_mod.jpg?​direct&​600 |Remove the white capacitor}} 
 + 
 +Then power the controller and test it, if it doesn'​t work, put the mustard one back in and test it again.  
 + 
 +If that didn't work either the board might be more damaged.  
 + 
 +They are bypass caps, the system can work without them. But if they are broken, they short the voltage rails and prevent the system from booting. Hopefully, the power regulators onboard haven'​t failed.  
 + 
 + 
 +{{tag>​tech_note ms2000}} 
Address: 29391 W Enid Rd. Eugene, OR 97402, USA | Phone: +1 (541) 461-8181
removing_rf_mod_cap.txt · Last modified: 2019/07/09 19:25 by vik