Heathkit SB-1000 - Page 28

Page 29
STEP-BY-STEP ASSEMBLY
Refer to Pictorial 5-1 while you perform the
following steps.
f
Position the input chassis as shown in the
Pictorial.
( Installa rubber grommet in chassis hole FA.
NOTE: You may wish to use tape (not supplied) to
temporarily secure the screws that you will install
in ne next two steps.
Y Slide a #4 split lockwasher onto a 440 x 15/16"
screw. Then, from outside the chassis, push the
screw into hole FB.
o/ Similarly slide a #4 lockwasher onto a 4-40 x
15/16" screw and push the screw into hole FC.
VW Temporarily remove the control nut and control
lockwasher from the rotary switch. NOTE: Be
sure the switch detent rings stay on the switch
and remain in position while you perform the
next step.
yf SW2C, SW2D, & SW2E: Line up the locating
tab on the rotary switch with its corresponding
hole in the chassis. Then use the control nut
and control lockwasher (removed earlier) to
mount the switch on the outside of the chassis.
WwW Rotate the shaft of the rotary switch fully
counterclockwise (as viewed from the shaft
side of the switch). Now compare the rear
switch wafer with the one shown in Detail 5-
1A Part A. The wiper should make contact
with the indicated switch contacts. Rotate the
shaft of the switch clockwise and make sure
the switch has six positions (five clicks).
NOTE: Perform steps 1 through 7 only if the
wiper does not make contact with the correct
contacts, or if the switch has more or less than
six positions:
1. Turn the shaft of the switch fully
counterclockwise.
2. Temporarily remove the rotary switch
from the chassis.
3. Temporarily remove the two detent rings
from the switch.
4, Check the rear switch wafer against the
one shown in Detail 5-1A Part A. If the
wiper does not make contact with the
indicated contacts, rotate the shaft of the
switch until it does. NOTE: Do not change
the position of the shaft until you
complete step #7 below.
5. Position the rotary switch as shown so the
locating tab is on the right as shown in
Detail 5-1A Part B. Then reinstall the
detent rings so they are in slots 6 and 12.
NOTE: Make sure the rings stay in these
positions while you perform step 6.
6. Remount the rotary switch to the chassis
and recheck it for six positions.
7. Recheck the switch as you were directed
at the beginning of this step.
Slide #4 solder lugs onto the screws at FB and
FC. Then slide a 3/8" spacer onto cach of the
screws.
NOTE: Use the plastic nut starter to hold and start 4-
40 and 6-32 nuts on screws.
raf Carefully slide the rotary switch wafer onto
the shaft of the rotary switch and screws FB
and FC as shown (the switch can be installed
either way, as long as the side with twelve
lugs is away from the chassis). Then use #4
split lockwashers and 4-40 nuts to secure the
switch at FB and FC. NOTE: Be sure to position
the solder lugs at FB and FC as shown in the
Pictorial before you tighten the hardware.
A Use a 6-32 x 3/8" screw and a 6-32 nut to mounta
#6 solder lug on the inside of the chassis at FD.
Be sure to position the solder lug as shown in
the Pictorial before you tighten the hardware.
Refer to Pictorial 5-2 while you perform the
following steps.
UY Refer to Detail 5-2A and prepare a 20" small
coaxial cable. Use this cable in the next step.