Change Of Pcb U81 (Cpu2 Main Board) - Yamaha SIGMA-G5SII Service Information

(2) Control Board Attachment

4.2.4. Change of PCB U81 (CPU2 Main Board)

The PCB removal/attachment procedure and precautions are the same as those in item
4.2.2. For the CPU2 Main Board (U81), confirm the following items.
(1) Confirm that the following flash memory has been attached to the prepared board.
Service Information
①
Push the PCB
gently into the slot.
When the lever is
closed, the correct
insertion is not
available.
Fig.D20
The data required for the control has been written in this
memory. Therefore, the commercial memory product without
such control data can not be used.
Fig.D21
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For Service Engineer
②
When the upper
and lower levers
are both pressed
each in the central
direction, the PCB
is fixed.
③
Tighten the setscrews on the
upper and lower sections of
the PCB.
④
Plug the disconnected
connectors.
The main board can be replaced in the
machine with a different type or option
from that of the machine in this series.
However, there might be compatibility
issues because they are different
versions.