Bell & Howell - Projector - Filmosound 641 - 642 ... - Cine Information

16. DISASSEMBLING SOUND HEAD 18. DISASSEMBLING FIGURE 11 PARTS
Remove Figure 9 parts, as necessary,
in their indexed order of disassembly,
noting the following special precautions.
a. Do not remove the optical slit
assembly (6) unless in need of replacement
or cleaning.
b. The sound drum shaft (22) must be
handled carefully to avoid damage to the
drum. To remove, loosen the clamping
screw (18) in the holder (19). Loosen the
set screws (20) and (21) and press the
shaft from the sound head housing. As the
shaft is withdrawn, note the manner in
which the light pipe (24) and retainer (23)
are installed in the slot of the sound drum
shaft.
c. Note the manner in which the
springs (30) and (36) are engaged before
removing the related parts.
17. DISASSEMBLING FIGURE 10 PARTS
Remove Figure 10 mechanism assembly
parts, as necessary, in their indexed
order of disassembly, noting the following
special precautions.
a. Prise out the hinge pins (1) with a
wire cutter or similar implement to free
the lens carrier.
b. When removing the speed change
knob parts (5 to 10 inclusive) note the
manner in which the spring (9) is installed.
c. Remove the three screws (16) and
washer8 (17), two retaining rings (18) and
the clutch lever shaft (19) to free the outboard
bearing assembly (20) and rewind
clutch lever (21). As the clutch lever is
removed, the rewind button (22) and spring
(23) will be released.
d. When the sprocket assemblies (37)
and (38) are removed, be careful not to
damage the sprocket teeth.
16
Remove Figure 11 mechanism assembly
parts, as necessary, in their indexed
order of disassembly, noting the following
special precautions.
a. Note carefully the manner in which
the overcentre springs (7) are installed
before removing related parts.
b. When the screw (8) is loosened, the
assembled cam follower support (9 to 12
inclusive) can be withdrawn from the
restoring arm (13). Do not disassemble
the cam follower support assembly unless
the parts are in need of replacement.
19. DISASSEMBLING FIGURE 12 PARTS
Remove Figure 12 mechanism assem*
bly parts, as necessary, in their indexed
order of disassembly, noting the following
special precautions.
a. Be careful not to bend the blades
of the shutter (10) during disassembly.
b. The shuttle link bearings (14) are
secured in place within the notches of the
shuttle arms (15) and should not be pressed
out* Also, do not remove the ball and stud
assemblies (18) from the shuttle arms (15).
c. Inspect the pull-down cam followers
(16) for wear. These followers, or shoes,
can be turned end for end or reversed if
they appear badly worn.
d. The felt wicks (20) should be pressed
from the pull-down cam (19) and
replaced with new wicks if they appear
unusually dirty. New wicks should be
lubricated as instructed in paragraph 2*
e. Note that the upper forked end of
the shuttle arm plate (33) engages the
framer knob shaft (35). The framer knob
and shaft unscrews from the casting.
f. Items 36 to 45 inclusive are used