Heathkit IG-18 User Manual

Page 36
I NNER SHAFT
KNOB BUSHING
I
NNER SHAFT
KNOB
Detail 19B
Dual Knob Installation
In the following steps, the pointer on each knob
will be
lined up with a specific mark on the front
panel. Whenever yOll remove any knob, be sure
you replace it on the control shaft from which it
was removed,
CAUTION: Look very carefully at each outer
shaft knob bushing (#455-52) before you per-
form the following steps. Note that the bushing
has a round hole at one end and a "keyed hole"
at the other end. Be sure you place the bushing
on
the outer shafts of the switches so the round
hole is toward the panel.
( ) Refer to Detail 19B and place an outer
shaft knob bushing (round hole toward the
panel) on the outer shafts of the Sine Wave
Amplitude and
Square Wave Amplitude
switches. Then turn both switch shafts to
their full counterclockwise pOSitions.
( ) Line up the pointer of an outer shaft knob
with
the -50 .003 pOSition of the Sine wave
Amplitude switch, and
press the knob part
way onto the bushing.
Carefully remove the knob and bushing
assembly and press the bushing all the way
into the
knob,
( ) Replace the knob-bushing assembly on the
switch shaft,
( ) Repeat the last three steps for the Square
Wave Amplitude switch. Align the knob
pointer with the .1 volt switch pOSition.
( ) Refer to Detail 19B and push an inner shaft
knob bushing (#455- 51) onto each ofthe small
control shafts of the Sine Wave Amplitude
and
Square Wave Amplitude controls. Then
turn the control shafts to their full counter-
clockwise positions.
( ) Line up the pointer mark of an inner shaft
knob at the 7 a' clock position; then press
the knob part way onto the bushing.
( )
Carefully remove the knob and bushing as-
sembly and press the bushing all the way
into
the knob.
( )
Before replaCing the knob bushing assembly,
place a felt washer on the inner shaft in front
of the outer shaft knob.
( ) Replace
the knob-bushing assembly onto the
inner shaft as far as it will go.
( ) Repeat
the above five steps for the other
inner shaft knob and bushing.
This completes the Knob Installation.

Heathkit IG-18 Specifications

General

Brand	Heathkit
Model	IG-18
Category	Test Equipment
Language	English