Hitachi SK-HD1500-S2 Operating Instructions Manual page 87

Application note: Intercom setting for carbon type
2．Setting procedure
2.1 Loosen four screws of a left side panel, and a
side panel is removed.
2.2 Take out an AUDIO unit.
2.3 Set up the switch in a unit according to the
headset to be used.
screw
4 pcs
AUDIO Unit
2.4 Insert AUDIO unit, and attach a left side panel.
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INCOM1 : SW101
INCOM2 : SW102
DYNAMIC CARBON
DYNAMIC CARBON
INCOM1
SW101
INCOM2
SW102