Nikon SMZ25 Instruction Manual page 45

(2) Clamp the relay box cable using the arm clamps.
(3) Place the relay box arms over the focus unit as
shown in the figure, align the screw holes of the arm
with the two screw holes at the back of the focus
unit, and attach it by tightening the M5 hexagon
socket head bolts supplied with the relay box using
the hex driver (nominal designation: 4).
(4) Connect the cable of the relay box main body to
STAND of the P2-CTLA Control Box or RELAY of the
P2-CTLB Control Box.
 Connecting the relay cable (when not using a relay box)
Use the P2-RLYC Relay Cable to output the zoom
magnification information of the SMZ18 to the P2-CTLB
Control Box without using a relay box.
Connect the relay cable to the round connector on the left
side of the SMZ18, route the wire along the notch of the
focus unit cover and connect to the RELAY connector of
the P2-CTLB Control Box.
Chapter 3
Assembling
31
Clamping a cable
Attaching the relay box
Tightening the bolts for the relay box
Connecting the relay cable
Clamps