Elecraft KBT2 - Manual (Page 5)

5
Refer to Figure 2 for the following steps.
Lay the top cover upside down with the rear panel facing away from you.
Install the battery cutoff switch in the top cover. The switch terminals should be oriented to the right
as shown in Figure 2, corresponding to the “INT. BATTERY ON” label on the rear panel.
Secure the switch with two 4-40 x 3/8” (9.5 mm) pan-head Phillips machine screws (black), #4 lock
washers, and 4-40 nuts. Before tightening the hardware, align the switch slide with its hole in the panel.
Remove the two rear-most 3/8" (9.5 mm) screws, lock washers, and 4-40 nuts from the speaker. (The
lock washers and nuts will be used in a later step.) Insert 1/4" (6 mm) screws into the two holes and through
the fibre washers.
Two hex male/female standoffs are used to secure the front edge of the battery bracket (Figure 2,
Detail A). Install the hex standoffs onto the two 1/4" (6 mm) speaker screws installed in the previous step
Place the battery in the position shown inside the top cover. The (-) terminal must be to the left.
Lay the 2” x 6” (5x15 cm) foam pad on top of the battery.
Install the battery bracket over the battery and foam pad, securing it with the two 4-40 screws, four 4-
40 nuts and #4 lock washers removed in a previous step. Do not over-tighten the hardware since this may
warp the top cover or strip the threads of the standoffs. The battery bracket should be seated flat on the
cover at all four points.
Cut the following lengths of insulated wire:
__ BLACK, 7” (18 cm) __ RED, 3” (7.5 cm)
__ RED, 7.5” (19 cm) __ RED, 12” (30.5 cm)
Strip 1/2” (12 mm) of insulation from each end of the above wires.
Refer to Figure 3 for the following steps.
Wrap the leads of the 6.2 ohm resistor around the leads of the SB530 diode as shown in Figure 3,
Detail B. The resistor should be positioned as close to the diode as possible to insure that the heatshrink
tubing will fit over the assembly in a later step. The resistor’s leads should be just long enough to wrap
around the diode leads.
Verify that the banded end of the diode is positioned away from the resistor before proceeding.