Heathkit HW 8 Manual

Page 1

HEATHKIT
MANUAL

Page 57

HEATHKIT)

Page 55

VERNIER
DRIVE

Detail 4-5B

( ) Temporarily remove the two brass screws from the
front of the vernier drive:

( ) Place the dial on the vernier drive so the scale of the
dial is toward the right as shown in the Pictorial. Then
secure the dial to the vernier drive with the previously
removed brass screws. CAUTION: Do not scratch the
face of the dial.

( ) Place the front panel on the chassis. Then secure it
with control nuts at AE and AF. Be careful you do
not scratch the panel when you tighten the control
nuts.

INSTALLING KNOBS

Place the split bushing on the inner shaft of control
AF; then press a small knob on the bushing. Turn the
knob until its color dot is lined up with the word OFF
on the panel and securely tighten the knob setscrew.

Turn the shaft of capacitor AA fully counterclockwise
and place a small knob on its shaft. Line up the color
dot on the knob with the left scale-mark on the panel;
then tighten the setscrew.

Turn the shaft of switch AE fully clockwise and place
a small knob on its shaft. Line up the color dot with
the NARROW line on the panel and tighten the
setscrew,

Tum the shaft of capacitor AJ until the capacitor
plates are fully meshed; then place a small knob on the
shaft. Line up the color dot on the knob with the left
scale»mark on the panel and tighten the setscrew

Place the large knob on the shaft of vernier drive AH
and tighten the setscrew. NOTE: Be sure the knob
turns freely and does not rub against the panel.

NOTE: When you perform the next step, be very careful
you do not bend the plates of the capacitor.

Carefully turn the rotor (movable plates) of the
capacitor at AH fully clockwise (unmeshed).

Turn the large knob CLOCKWISE until the mark to
the left of the zero on the dial scale is lined up with
the black line of the window.

Refer to Detail 4-58 and securely tighten the two
setscrews in the vernier drive,

NOTE: Do not forcefully rotate the tuning capacitor to its
extreme and stops. This could damage the tuning
capacitor plates.

( l Start 6-32 x 1/8" satscrews in the four small knobs.

( ) Start an 8-32 x 3/8 setscrew into the large knob.

Turn the outer and inner shafts of control AF
counterclockwise as far as they will go. NOTE: Be sure
you turn the inner shaft until the switch clicks off.

With the tab of the silver knob in the MIN position,
press the knob onto the slotted outer shaft of control
AF.

( l Rotate the large knob and turn capacitor AH to its full
open or closed position; then continue to turn the
large knob. The left or right end of the dial scale
should stay lined up with the reference line of the
window. NOTE: If the dial does not stay lined up, the
capacitor shaft is slipping in the vernier drive. If this
occurs, perform the previous two steps over again and
make sure the set screws in the vernier drive are tight.