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Chapter 3
INSTALLATION AND SETTING PROCEDURES (HARDWARE)
6.11. Microphone Fault Detection Function Setting (RM-300X Only)
This work should only be performed by a qualified professional
electrician. If users open the unit case or modify the unit, this may
cause fire or electric shock.
WARNING
The RM-300X is equipped with the microphone fault detection function, which can be set to OFF . (Factory-
preset to ON)
Notes
• Turn off the power before starting this work.
• To avoid damage from static electricity, never touch the parts on the circuit board.
Step 1. Unscrew 8 screws indicated by arrows in the gure at
right, then detach the RM-300X's upper case.
Note
Note the types of screws.
A: 3 x 8 tapping screw (white silver) ........... 6 pieces
B: 3 x 10 tapping screw (black) .................. 2 pieces
RM-300X bottom
A
A
B
B
A
A
A
A
Step 2. Set the jumper's position (SW303) on the circuit board attached to the bottom plate as shown below.
SW303
RM-300X inner circuit board
Front side
SW303
When setting the
microphone fault
detection function
to ON.
(Factory-preset)
When setting the
microphone fault
detection function
to OFF.
SW303
Step 3. Replace the RM-300X's upper case.
Note: Note the types of screws when replacing the upper case (See Step 1.)
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