Heathkit SB-10 Series Troubleshooting Manual page 6

x.1.4.AGC Figure of Merit...................................................................................................................................... 60
x.2.Summation...................................................................................................................... 60
y)Heathkit "S" Meter Circuit.........................................................................................61
y.1."S" Meter vs. AVC Voltage.............................................................................................62
y.2.AVC and "S" Meter Calibration......................................................................................63
z)Servicing Procedures.................................................................................................64
z.1.Front Panel Remove and Replace.................................................................................64
z.1.1.Front Panel Removal.................................................................................................................................... 64
z.1.2.Front Panel Installation................................................................................................................................. 65
a)Make sure that the preselector shaft has these items installed in the following
order facing back from the panel: a flat washer, a lock washer, the nut and two
rubber "O" rings. The bushing for the Preselector shaft is installed from the front
after the panel is installed.............................................................................................65
b) Make sure that the PA Tune shaft has these items installed in the following
order facing back from the panel: a flat washer, a lock washer, the shaft bushing
and a large "O" ring. The front flat washer and nut are installed from the front
after the panel is in place..............................................................................................65
a)During this procedure, be especially careful not to place too much pressure on
the main tuning dial.......................................................................................................66
b)During this procedure, be especially careful not to place too much pressure on
the zero set shaft...........................................................................................................66
z.2.Front Panel Escutcheon Mounting................................................................................67
z.3.SB Series Dial Mechanism.............................................................................................69
z.3.1.Installation of the Spiral Groove Follower Mechanism..................................................................................69
z.3.2.Installation of Circular Dial on LMO Shaft.....................................................................................................69
a)If the dial pointer is to the right of the zero marking, loosen the dial pointer drive
arm mounting screws, and move the dial pointer drive arm base to the right until
the dial pointer is at zero. Do not move the dial pointer drive arm base up or
down. Retighten the screws.........................................................................................70
aa)If the dial pointer is to the left of the zero marking, loosen 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....................................................70
a)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
pointer is at the "5" marking. Retighten the screws..................................................71
HW & SB Series Manual Page 6