Marantz PMD670/W1B Service Manual page 7

7) Remove 5 connectors as shown in Fig.8. And remove the
top case.
<Fig.8 Position of connectors>
8) Remove 4 connectors as shown in Fig.9.
<Fig.9 Position of 4 connectors>
9) Remove 5 screws.
Then remove side panel of Audio I/O side.
<Fig.10 Position of 5 screws>
5