
400 Series
2-15
Procedure 5
Replacement Check
The system board or the sound board may be damaged. Disassemble the 400 series following
the steps described in chapter 4,
Replacement Procedures,
and perform the following checks:
Check 1.
Replace the system board with a new one. Refer to chapter 4 for instructions on
how to remove and replace the system board.
Check 2.
Replace the sound board with a new one. Refer to chapter 4 for instructions on
how to remove and replace the sound board.