Sony DFS-900M Operating Instructions Manual page 26

7 POWER switches A and B
6 -AC IN connectors A and B
5 Ground terminal
4 DEVICE connector
3 MAINTENANCE connector
2 PROCESSOR connector
1 EXT DISPLAY connector
On how to use each connectors and switches, see
descriptions in "BKDF-901 Rear Panel" (page 18).
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BKDF-902 1.5M/E Control Panel