Released/Cocked Position - Minolta XD-11 Repair Manual

TENSION-
SETTING
RATCHETS
C A M
SPRING
s
FLYWHEEL
Figure 89 Released position
Be careful as you lift off the bridge
plate — several shutter parts are loose,
Fig. 89. In early shutters, you can lift out
the loose flywheel which engages the tim ­
ing cam. Later models changed the fly­
wheel design; you can't take out the later-
style flywheel until you remove the timing
cam.
Also lift out the timing-cam spring and
the spring for the shutter-release lever,
Fig. 89. Notice that the lower end of the
timing-cam spring sits w ithin a slot in the
timing cam. The straight end of the spring
for the shutter-release lever sits against a
pin on the magnet bridge, the plastic sup­
port for the electromagnet.
Next lift out the tw o tension-setting
ratchets. The slots in the ratchets fit over
the upper ends of the blade-drive springs.
In early shutters, the
through the centers of the blade-drive
springs are also loose, Fig. 90. In later
shutters, the posts are formed on the rat­
chet gears.
W ith the loose parts removed, you can
safely operate the shutter. Note the posi­
tion of the trigger-switch blade in Fig. 89.
A washer holds the trigger-switch blade
on the magnet bridge. The upper end of
the trigger-switch blade connects to the
shutter-terminal board; the lower end
rests against the cam ridge of the timing
cam.
Remember, the timing cam rotates
clockwise during the cocking cycle. The
cam ridge then allows the trigger-switch
blade to move from left to right, Fig. 90.
So, w ith the shutter cocked, the trigger-
switch blade moves against the eccentric
pin on the bridge plate. The trigger switch
now connects the orange-wire terminal of
the shutter-terminal board to ground.
In Fig. 90, you can also see how the
timing cam drives the armature against
the electromagnet. A roller on the ar­
mature rides against the outer edge of the
timing cam. As long as the timing cam re­
mains latched
lever, it holds the armature against the
electromagnet.
Disengaging the shutter-release lever
allows the spring-loaded timing cam to
rotate counterclockwise. A cutout in the
outer edge of the timing cam then frees
the armature, Fig. 89. It's now up to the
electromagnet, the bulb lever, or the
mechanical-speed latch to hold the ar­
mature and prevent the closing blade
from releasing.
Also, the ridge on the timing cam
drives the trigger-switch blade away from
the eccentric
trigger-switch blade from ground opens
posts passing
the trigger switch. Toward the end of the
rotation,
opening-blade latch to release the open­
ing blade.
On reassembly, rotate the timing cam
to the released position. Fig. 81, before
you replace the bridge plate. The trigger-
switch blade then clears the eccentric pin.
But rotate the timing cam to the
cocked position, Fig. 90, to remove or to
replace the trigger-switch blade. Remove
the trigger-switch blade by lifting o ff the
insulating washer. Notice that each end
of the
through a slot in the plastic magnet
bridge.
Take out the bulb lever by first discon­
necting its spring, Fig. 90. Then lift the
bulb lever up and o ff the magnet-bridge
post. If you just w ant to lift off the
magnet bridge, you can leave the bulb
lever and the remaining parts in place.
However, if you're replacing the elec­
tromagnet, also remove the timing cam,
the armature, and the mechanical-speed
Figure 90 Cocked position
by the shutter-release
pin. Disconnecting
the timing cam strikes the
trigger-sw itch blade passes
latch. The replacement electromagnet
and the magnet bridge come as one
assembly.
Before you remove the magnet bridge,
though, you might note one more timing
point — that of the timing cam. Even if
you leave the timing cam in place, it's
possible to lose the timing. The timing
cam may lift up slightly, thereby allowing
its pinion to disengage from the set gear,
Fig. 91.
The set gear is the gear segment under
the timing cam. As you cock the shutter,
a pin on the shutter-cocking lever comes
against the right-hand edge of the set
TIMING
the
Figure 91
gear. The shutter-cocking
drives the set gear in a counterclockwise
direction. In turn, the set gear rotates the
timing cam clockwise.
If you hold the shutter-cocking lever
fully advanced, the left-hand edge of the
set gear comes against a stop pin on the
magnet bridge, Fig. 91. The timing cam
should now be in the position shown in
Fig. 91; notice that the first tooth of the
timing cam points to the pivot post for
the inertia flywheel. If the timing isn't
right, lift the timing cam far enough to
disengage the set gear. Then, w ith the set
gear against the stop pin, position the
lever then