Tektronix 3 - Page 6

Operating Instructions—No. 3 Electric Shutter
and down. Release the knob and allow the Speedcomputer
to rotate into its down position. After the camera back is
closed again, the Speedcomputer is rotated back to normal
position by pushing it up and in toward the camera. The
Speedcomputer locks into position automatically.
Operating Controls and Connectors
POWER Indicator lamp lights when line-voltage
is applied to the Speedcomputer and
the ON-OFF switch is in ON position.
ON-OFF Turns the line voltage to the Speedcom-
puter on or off.
SHUTTER Indicator lamp lights when the shutter
blades are open. The lamp will stay lit as
long as the shutter blades are open.
NOTE
If Electric Shutter fails to operate and POWER indi-
cator lamp will not light, check fuse. The fuse is
located inside the Speedcomputer case. Instruc-
tions for disassembly of the Speedcomputer will
be found in Section 6.
ACTUATE
(Pushbutton)
Causes the solenoid in the Electric Shut-
ter to be energized, thereby opening
the shutter blades. In any speed setting
except (T) the solenoid will automatic-
ally de-energize (shutter blades close)
when the indicated (speed setting) time
has passed. In the (T) position the
ACTUATE pushbutton must be pushed
twice, once to open the shutter blades
and once to close the shutter blades.
Knob that determines the time the shut-
ter blades will remain open. In (T) the
shutter blades can remain open for an
indefinite time without any damage to
the Electric Shutter or Speedcomputer.
Speed
Remote (3 pin
connector on side
of actuator)
The action of pressing the ACTUATE
pushbutton may be done remotely by
either shorting pins A and C of the con-
nector together momentarily, or by con-
necting +27 VDC to pin A of the con-
nector using pin B as ground. Accepts
male connector (Tektronix Part No. 131-
0423-00).
Receptacle into which connector from the
(6 pin connector Electric Shutter connects to obtain power
on side of actua- (J10, pins F and B) for the solenoid and
tor) to supply (via J10, pins D and E) shutter-
blade position information open or
closed) to the Speedcomputer. It also
supplies the switch connections (J10, pins
A and C) to the X Sync Posts from the
Electric Shutter.
Electric Shutter
Power Cord
X Sync Posts (2
pin connector on
side of actuator)
The power cord is permanently attached.
An extension of normally open switch
contacts in the shutter assembly. Contacts
are open (off) when shutter blades are
closed and closed (on) when shutter
blades are opened.
2-2
Raise lever to open shutter blades for
focusing purposes. Close shutter blades
by lowering lever or actuating Electric
Shutter normally.
Press Focus (Lever
located on side of
shutter assembly)
Power Transformer Line-Voltage Conversion
The Speedcomputer as shipped from Tektronix, Inc., unless
otherwise ordered, will be wired for 105-130 volt AC opera-
tion. To change the Speedcomputer so it will operate on a
210-260 volt AC line voltage, refer to Fig. 2-2B. Fig. 2-2A
illustrates how to convert the Speedcomputer back to 105-
130-volt AC line voltage. Whenever the line voltage is
changed, the fuse must also be changed, see electrical parts
list for correct value.
Fig. 2-2. Transformer primary connections for: (A) 105-130 VAC
operation. (B) 210-260 VAC operation.
Disassembly instructions for the Speedcomputer will be
found in Section 6.
Operating Electric Shutter and Speedcomputer
NOTE
To prevent a misleading display on the oscillo-
scope, the leads of the Electric Shutter/Speed-
@i