Troubleshooting 4
S-Series Oscilloscopes Service Guide 67
 
Keyboard Troubleshooting
If some of the knobs fail the keyboard self test but some work properly, replace the 
rear board of the keyboard assembly.
If none of the knobs work properly, replace the front board of the keyboard 
assembly.
If any of the keys do not work properly but the LEDs light up, replace the front 
board of the keyboard assembly.
If the keys still do not work properly, check the incoming cables.