Heathkit SB-401 Assembly Manual page 93

The preceding adjustment
may
affect the dial
pointer setting at the zero marking. Repeat the
entire procedure as many times as necessary to
obtain proper dial and pointer calibration. Be- ,
cause the dial pointer is only a turns counter, it
need not be exactly at a number when the cir-
cular dial is at one of its five possible zero
settings; however, the preceding steps should
permit fairly close calibration. Rotating the cir-
cular dial from the fully counterclockwise posi-
tion to the fully clockwise position will cause the
dial pointer to go to the left of the zero marking
and to the right of the "5" marking on the plastic
dial window. These adjustments in no way affect
frequency calibration, which depends only onthe
circular dial reading.
Refer to Detail 5-2D for the following steps.
( ) Rotating the circular dial in a clockwise
direction one revolution (zero to zero)
should move the dial pointer to the "1"
marking on the plastic dial window. Each
time the circular dial is rotated one revolu-
tion, clockwise, the dial pointer should ad-
vance one more number on the plastic dial
window. After five complete revolutions the
dial pointer should be very close to the "5"
marking on the plastic dial window.
If
not,
perform one of the following two steps.
( ) 2.
If
the dial painter is to the right of the
"5" marking, loosen the dial pointer
drive arm mounting screws and move
the dial pointer drive arm base down
until the pointer is at the "5" marking.
Do not move the dial pointer drive arm
base left or right. Retighten the screws.
( ) 2.
If
the dial pointer is to the left of the
zero marking, loosen the dial painter
drive arm mounting screws, and move
the dial pointer drive arm base to the
left until the dial pointer is at zero.
Do not move the dial pointer drive
arm base up or down. Retighten the
screws,
( ) 1.
If
the dial pointer is to the left of the
"5" marking, loosen the dial pointer
drive arm mounting screws and move
the dial pointer drive arm base up until
the dial painter is at the "5" marking.
Do not move the dial pointer drive arm
base left or right. Retighten the screws.
( ) 1.
If
the dial pointer is to the ~~gh~of the'
zero marking, loosen the dial painter
drive arm mounting screws and move
the dial pointer drive arm base to the
righ~ until the dial pointer is at zero.
Do not move the dial painter drive arm
base up or down. Retighten the screws.
Detail 5-20
Detail 5-2C
DIAL DRIVE ARM
"----MOUNTING SCREWS-------
DIAL DRIVE ARM
c....--MOUNTING SCREWS~
DIAL POINTER
DRIVE ARM BASE
o
o
DIAL POINTER
RIVE ARM BASE
-:
3 4 2 1
o NOTE: TO ADJUST THE
SCREWS OF THE DIAL
POINTER DRIVE ARM,
LOOSEN AND TIGHTEN
THE NUT S WIT H' THE
1/4" OPEN END
W R E NC H.
I I I
Is
II
//
~
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