Replacing The Shutter; Adjusting The Blade-Travel Times - Minolta XD-11 Repair Manual

Figure 85
Now a spring drives the opening blade to
the top of the aperture — back to the
"ready" position. W ith the shutter re­
leased, both blades cover the aperture.
Since only one blade moves during the
cocking cycle, the Seiko has a smooth
Figure 86
wind stroke which adapts well for use
w ith a power winder. You can get a better
idea of the operation if you try pulling
down the arm on the opening-blade driv­
ing lever. Fig. 84, with the shutter in the
released position. Pulling down the arm
should move the opening blade to the
bottom of the aperture. When you let go
of the arm, the return spring drives the
opening blade to the raised position.
Also try operating the shutter while
you're holding the bulb
clockwise. Fig. 85. You should then get
the fast mechanical speed — somewhere
between 1/1000 and 1/2000 second.
Here, the bulb lever can't engage the
armature. And, since there's no current
through the electromagnet, the armature
releases the closing blade immediately.
To set the 1/100-second mechanical
speed, hold the bulb lever in its center
position, Fig. 85. The bulb lever still can't
engage the armature. But another lever
— the mechanical-speed latch — holds
the armature to provide the full-aperture
speed.
The mechanical-speed latch sits just
under the bulb lever, Fig. 86. W hen the
opening blade crosses the aperture, it
disengages the mechanical-speed latch.
Now the armature frees the closing blade.
Figure 87
When the bulb lever moves to the
electronic-speeds
clockwise,
mechanical-speed latch away from the
armature. Neither the mechanical-speed
latch nor the bulb lever then has any ef­
fect on the operation.

REPLACING THE SHUTTER

In normal operation, the mechanical-
speed lever. Fig. 87, controls the bulb
lever fully
lever. A cam under the shutter-speed
resistor positions the mechanical-speed
lever. Also note the tab on the release
slide in Fig. 87. The tab pulls the bulb
lever out of engagement to end the bulb
exposure.
On reassembly, first cock the shutter.
Then position the wires through the wire
clamp, Fig. 80, as you seat the shutter on
the mirror cage. Make sure that the bulb
lever passes
mechanical-speed lever, Fig. 87, and that
the bulb-lever pin sits above the release-
slide tab.
ADJUSTING THE BLADE-
TRAVEL TIMES
Both blades should cross a 20mm
distance in 6ms. To increase the tensions,
rotate the blade ratchets, Fig. 84, in a
position — fu lly
Fig. 85 — it pulls the
to the inside of the