Read Sharp LC-22DV240K Parts Guide online
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LC-22DV240
LC-22DS240
LC-22DS240
21.5. Keypad Touchpad Problems
Problem: Keypad or Touchpad is not working
Check keypad supply and KEYBOARD pin on MB62.
21.6. USB Problems
Problem: USB is not working or no USB Detection.
Check USB Supply, It should be nearly 5V.
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