Seiko #0 shutter Service Manuals

Anatomy of Seiko #0 shutter used on Zenzanon lenses

B

B

A

C

D

E

F

F

G

H

By M.Vettore (V.1.3)

Seiko shutter #0 could be analyzed in two views: functional and physical. In the functional view it
consists of two subsystems:

• A subsystem controls all happens before shooting phase.

• A subsystem controls all happens in the shooting phase.

The two subsystems are strongly coupled by the disk marked A on the picture PIC 1 and weakly
coupled by the disks marked M and N on picture PIC 11.
In the physical view Seiko shutter #0 is like a sandwich, 2 slices with filler.

• The bottom slice is the rear side of the shutter, faced to the lens back.

The rear side contains the mechanical interface between the camera body and the shutter,
indeed through the lens. This side controls the cocking and shooting actions and the DOF
preview command although the command lever is on the other side of the lens.

• The upper slice is the front side of the shutter faced to the lens front; it is associated with the

lens controls, like aperture (diaphragm) ring and A/T lever.

• The filler is the shutter body; it consists of two sections, one with the shutter and diaphragm

blades, and the other with the mechanisms to control the first.

Rear side

PIC 1: Rear view of Seiko #0 shutter (old style) uncocked

1

G

I

Slotted disk

A

Slots for the lever arms driven by the pins in the back of lens

B

Shutter drive roller, this roller is spring loaded, the arrow shows the direction the spring

C

heads
DOF preview lever, the arrow shows the pushing direction to close the diaphragm

D

Diaphragm drive roller

E

Cocking direction of the lever arms

F

Lever drives shutter mechanism

G

Lever drives shutter trigger

H
Table 1

PIC 2: Side view, the lever G and the lever I load the shutter mechanism. Shutter is uncocked. The

arrows shows the direction of lever G and I when shutter cocks.
The lever, after the cocking phase, remains at the end of its span because an escapement inside the
shutter
In the next photo the lever G has been retracted but lever I remains loaded.

PIC 3: The shutter is ready to fire.

2

H

1

1

2

3

4

J

4B

4B

P

Q

PIC 4: Side view. The lever H, this lever driven by the cam cut on the disk A is the shutter trigger.

Lever H must hit lever J to fire the shutter. Q is the A/T selector latch; P is the A/T selector
extending lever.

Sequence of operations

PIC 5: Lens pins drive shutter roller (uncocked).

Shutter cocking engagement area

1

When shutter roller lies on this orbit the shutter is full close

2

When shutter roller lies on this orbit the shutter is full open

3

Rotating the pin counterclockwise/clockwise also rotates the disk

4

A little gap exists into pin movement, the pins don’t rest at the very beginning of their slots

4B

Table 2

3

5

6

7

PIC 6: Diaphragm pin (lens uncocked)

Diaphragm roller spans from the higher to the lower F setting

5

Diaphragm roller orbit at lower F setting (full open)

6

Diaphragm roller orbit at choused F setting

7

Table 3

PIC 7: Diaphragm roller (lens cocked)

Cocking

1. To cock the shutter the lens pins are rotated counterclockwise (#4 on PIC 5), the pins move

two arms inside the lens (see PIC 12 on this page) the arms are engaged through the slots B
(PIC 1) on the disk A (PIC 1) and rotate the disk.

2. The disk rotating pushes the lever G (PIC 2) against lever I (PIC 2) loading shutter springs,

somewhere in the cocking shutter engagement area; an escapement inside the shutter lock
the lever I (PIC 2), see PIC 3.

3. During the disk rotation the shutter roller is released from orbit 2 (PIC 5) to orbit 3 (PIC 5)

or from full shutter close to full shutter open.

4. At the same time the diaphragm roller is moved from the preset position determined by the

aperture ring (orbit 7 on PIC 6) to full open position (orbit 6 in PIC 6) of course it is still
possible to momentary move the diaphragm aperture back to preset position using the DOF
preview lever (D on PIC 1).

4

Shooting

H

K

D

L

1. When camera shots the lens pins are rotated clockwise till the end of their slots overcoming

the gap 4B (PIC 5) this causes the rotation of the slotted disk.

2. Shutter roller returns back to uncocked position full closing the shutter, diaphragm roller

also returns back to uncocked position opening the diaphragm at the preset position.

3. The overcoming of the gap 4B (PIC 5) kicks the H lever (PIC 1) till the trigger J (PIC 4)

this will open the shutter till the magnet keeps it open. (or for the default time 1/500 of
second when the camera doesn’t control the lens). The disk A will rotate back a while to

reach the uncocked position just around the gap 4B (PIC 5).
Behind disk A there is another disk, the function of this disk is to control the diaphragm aperture,
the curve cut on the disk moves the roller L inside out, and the roller rotates a lever acting on the
diaphragm spindle. The lever K is actuated by the aperture disk on the other side of the shutter.

PIC 8: Diaphragm aperture disk located behind disk A.

5

Inside shutter body

chamber

cup

cover ring

O

H

The shutter body consists of three chambers::

• One contains the diaphragm.

• One contains the shutter.

• One contains the shutter firing mechanisms.

Rear side of the

Shutter

PIC 9: Shutter body section sketch

Diaphragm chamber

Front

Diaphragm cover

Diaphragm chamber

Shutter chamber

Shutter rings cover

Shutter firing

Shutter base plate

PIC 10: Diaphragm chamber with diaphragm cover

6

The diaphragm operates in a classical way: the blades pivot on a ring (O on PIC 10) rotated by a pin

M

N

9 10

C

applied on the spindle of lever H.

Shutter chamber

PIC 11: Shutter rings with a single blade (shutter rings cover removed)

Shutter external ring

M

Shutter internal ring

N

Flash contact actuating pin

9

Ring N actuating pin

10

The roller C acts on a lever rotating a spindle connected to lever AE (see PIC 13)

C

Table 4

The PIC 11 shows the shutter chamber with the rings cover removed; one blade has been put in
place even without the rings cover.
The blades double pivot on the two disks, the disks act independently but only one at time.
The external disk M is driven by lever AE as show on PIC 13 it determines the blades position
when the lens is uncocked (full close), cocked (full open) or ready to shoot (full close).
The internal disk N is driven by the shutter firing mechanism, the disk in its turn drives the flash X
synch contact.

7

X

Y Z

DD

AE

M

PAD

PIC 12: The three slots on the base of shutter chamber: Z is the flash X synch slot, note the contact

behind, Y is the slot through the external disk M is driven, X is the slot through the internal disk N
is driven; note the slotted fork behind (disk DD) which engages the disk pin.

PIC 13: Lever AE pushes the disk M pin through the slot Y; note the spring forces the lever AE
outward and the pad limiting the span of disk M actuating pin. The pad position is fine adjusted by
a factory sealed screw. The pad also holds the spring V (see PIC 18).

8

PIC 14: Normal blade (upper left), reversed blade (upper right), special blade (bottom)

The shutter is made of five blades plus a special blade, every blade but the special blade consists of
two welded petals: the full petal and the reinforcement petal; the special blade is only a loose
reinforcement blade. Four of five blades have the reinforcement faces the front of shutter (lens) but
one has the reinforcement on the other side.
The flower is arranged starting with the special blade then proceeding counter clockwise with
normal blades till the fifth blade that is the reversed one lies over the special blade. With this
arrangement isn’t necessary to overlap the first blade to the last one.

PIC 15: Side view of the shutter disks

9

M

Shutter open

A2

B2

N

M

Shutter cocked

M

A2

B1

A1

N

Shutter uncocked

B1

N

PIC 16: Sketch of M and N disk positions.

10

The positions of disk M and N are summarized in the following table:

M position N position Status
A2 B1 Shutter uncocked (close)
A1 B1 Shutter cocked (open)
A2 B2 Shutter open
A1 B2 Not available

Table 5

Shutter firing chamber

PIC 17: Shutter firing chamber, cogged ring and shutter open trigger removed.

The shutter firing chamber contains the following subsystems:

• Shutter charge and trigger subsystem: this subsystem loads and releases the shutter

open/close subsystem.

• Shutter open/close subsystem: it controls the shutter open/close operations.

• Shutter time subsystem: it controls how much time the shutter remains open.

• Electric control subsystem: this subsystem includes the shutter electric devices.

• A small assembly controls the movement of disk M (see PIC 12)

Shutter charge and trigger subsystem

11

R

S

T

J

R

V

Stopper

Pin

Pad

Cogged sector

PIC 18: Shutter charge and trigger subsystem in rest position

The cogged ring (R on PIC 18) when the shutter is cocking, is turned clockwise (front side view) by
lever I (PIC 2), loading the spring (V on PIC 18) till the stopper blocks its rotation reaching the left
end of the slot, the hook lever (T on PIC 18) is spring loaded to push leftward and when it reachs
the slot (S on PIC 18) it engages it preventing R to turn back (see PIC 19). If the shutter opening
trigger (J on PIC 4 and PIC 18) rotates counter clockwise, when the shutter is cocked, it forces T to
rotate rightward releasing R which in turn will rotate back to its rest position.

PIC 19: Hook lever T engages cogged ring R.

Shutter open/close subsystem

12

AA

AA

BB

CC

BB

Pin

PIC 20: Highlighted: the shutter open/close subsystem.

PIC 21: Highlighted: the shutter open/close subsystem, cogged sector AA taken apart.

13

PIC 22: Highlighted: parts of the shutter open/close subsystem.

FF

DD

BB

FF

PIC 23: Left spring assembly.

.

14

DD

CC

Cog

FF

Pin Fork

PIC 24: Right spring assembly (Rear view).

Cog of DD

PIC 25: Spring assemblies.

Shutter open/close subsystem description

There are two spring assemblies:
The left element has a spring grounded at low end to the shutter housing and at top end to a cogged
sector BB (See PIC 21 and 23).
Over the cogged sector BB there is another cogged sector AA (PIC 20 and 21) turning on the same
spindle of BB but independent from the underlying one.
The top cogged sector AA has a pin (PIC 20) dragging the underlying cogged sector BB when AA
rotates counter clockwise; this rotation loads the left element spring.
The right element (PIC 24) has a spring grounded at low end to a disk DD; this disk has a fork
driving the pin of internal shutter ring N. Disk DD also has a cog and a pin prolonging from it (PIC
24 and 25). The right element spring top end is grounded to a cogged sector CC turning on the same
spindle of disk DD but independent from it.
The cogged sector CC has a vertical cog facing the pin of disk DD (see PIC 24).

15

The cogged sector CC is geared on the cogged sector BB so when BB rotates counter clockwise
CC rotates clockwise and vice versa.
At the same level of disk DD there is a “L” shaped lever FF (PIC 22) pivoting on its knee and
spring loaded to stay leftward; this lever at one end engages the cog on disk DD (see PIC 25), on
the other end the lever FF is dragged by the pin on cogged sector AA.
Cogged sector CC also has a cam which engages the trigger lever W (see above).
The pin on disk DD is engaged by lever EE (see above).
The mechanism at rest position is showed on sketch 1 of PIC 26, to cock it the ring R rotates
clockwise turning the cogged sector AA counter clockwise. The pins on cogged sector AA drags
counter clockwise the cogged sector BB, which loads the left element spring.
Rotating the pin of cogged sector AA counter clockwise also permits that the lever FF pushes by its
spring will go leftward engaging the cog on disk DD and preventing the clockwise rotation of disk
DD.
On rotation of cogged sector BB, also cogged sector CC could rotate on its turn clockwise, but due
to disk DD it cannot rotates clockwise, the right element spring will be loaded.
At the same time the trigger lever W traps the cam end of cogged sector BB preventing BB to rotate
counter clockwise and locking the mechanism on cocked state (see sketch 2 on PIC 26).
When the system is fired, on clockwise rotation of ring R, the cogged sector AA rotates clockwise
and its pin forces the lever FF to go rightward freeing the disk DD which will be rotate clockwise
by the right element spring. The rotation of disk DD moves the fork at open shutter position and
pushes its pin against lever EE which preloads the release of trigger lever W. The mechanism will
be in open state as showed on sketch 3 of PIC 26.
When the trigger lever G will pull out, freeing the cogged sector CC, it will rotate counter
clockwise because the discharging of left element spring through cogged sector BB, this rotation
causes the vertical cog of cogged sector CC drags the disk DD pin to the shutter close position.
The mechanism returns back to its rest (uncocked) position.

16

Cogged sector AA

2

3

Cogged sector BB

Pin

Lever FF

Trigger lever W

Lever EE

Spring loading
direction

Pin

Cogged sector CC

Shutter open

Vertical cog

Shutter close

Cam

Cogged ring R

Disk DD

1

Fork

Shutter uncocked

Shutter cocked

Pin

Cog

PIC 26: shutter open/close subsystem.

17

Shutter time subsystem

U

GG

PIC 27: Highlighted: parts of the shutter time subsystem.

Spring assembly

PIC 29: Shutter time subsystem

18

II

JJ

HH

EE

W W

U

W

T

PIC 28: Highlighted: parts of the shutter time subsystem

A

PIC 30: A/T selector latch

19

A/T Selector position

The time control subsystem includes:
Spring assemblies (see PIC 29) where a top device (HH on PIC 28) is free to rotate on its spindle
but limited on a side by a cog engaged by the pin of a lever (EE on PIC 28) which could rotate HH
counter clockwise. Tied back to HH there is a plate with a pin keeping HH away from a magnetic
anchor (II on PIC 28) and preventing HH to turn clockwise.
The plate is fixed to HH by a screw which permits to adjust the pin extension. This screw is factory
sealed. The pin extension adjustment allows fine-tuning of the system inertia to get the right delay
to obtain the minimum (default) shutter shoot time of 1/500 sec.
At the bottom of spring assembly there is a device (GG on PIC 29) turning on the same spindle as
HH, but independent from it, and constrained by a spring grounded on the shutter housing to
proceed counter clockwise. The device GG has a cog engaged by a lever (W on PIC 28) and holds
the magnetic anchor II.
The lever EE has a pin pushing the device HH clockwise and a spring driving EE to turn
clockwise.
The trigger lever W has an extension that hooks the cog on GG and when GG turns clockwise the
other sides of W turns counter clockwise freeing the shutter close mechanism.
In rest condition lever EE by means of its pin pushes HH clockwise, HH rotation is blocked by
anchor II. Due to its spring, GG is pressed counter clockwise and stopped by anchor II which
closes the electromagnet joke. The lever W freed from GG pressure is turned clockwise (see sketch
1 on PIC 31).
When EE turns counter clockwise because rotation of disk DD, EE releases HH which in turn
releases the anchor II which if not attracted by electromagnet (JJ on PIC 28), leaves device GG
free to turn clockwise. Device GG, rotating, pushes lever W counter clockwise unblocking its
trigger hook (see sketch 2 on PIC 31).
In opposition, if the electromagnet is energized anchor II doesn’t move locking GG until the
electromagnet is de-energized. (See sketch 3 on PIC 31)
Summarizing: in shutter shot phase at the end of shutter open action the rotation of disk DD triggers
lever HH which in turn starts the delay mechanism to determine the shutter open time. There are
three cases causing the release of the trigger W and starting the shutter close phase:

1. Default or minimum time (1/500 of sec): in this case W is triggered after the intrinsic delay

of the system without any external action.

2. Controlled mode: in this case the energized electromagnet freezes the rotation of device

GG and W will not be triggered until the electromagnet will be de-energized, The shutter
open time is determined by the electromagnet energized time period.

3. Manual mode: That mode is the same as case 1 but at the end of the chain W is framed by

A/T selector latch (U on PIC 27 and 30), which determines when trigger W will start the
shutter close phase.

20

Pin

Lever EE

Device HH

Device GG
Anchor II

Spring load

Lever W

Screw

Electromagnet JJ

1 System rest

3 System half fired

PIC 31: Time control elements sketch

21

2 System fired

KK

SW1

LL

MM

R1

Electric control subsystem

PIC 32: Highlighted: parts of the electric control subsystem

Foot

Flap

PIC 33: Parts of the electric control subsystem

22

SW2

R

Pin

PIC 34: Parts of the electric control subsystem

Foot

PIC 35: Parts of the electric control subsystem

PIC 36: Part of SW2

23

Blue

Blue

White

To diaphragm value

B

Red

Red

Shutter

Frame

A

D C C

SW1

Shutter

A

wires

1 Black

SW2

2 Green

3 Yellow

4 Blue

5 Orange

6 White

PIC 37: Schematic diagram electric control subsystem

1/500 1/250

Blue

to

Black

wire

R1

D1

Solenoid of the

electromagnet

TP1

High

Voltage

Low

A

Orange

to

Black

wire

High

Voltage

Low

Time

1 mS 15 mS 4 mS 12 mS

B

PIC 38: Electric timing diagram.

The electric control subsystem contains the shutter electric parts; which schematic diagram is
sketched on PIC 37.
A toggle switch (SW1 on PIC 37 and 33) is controlled by a set of levers turning on the same spindle
(MM and LL on PIC 33).

24

MM has a spring grounded to shutter cup loading it counter clockwise, it also has another spring
connects it to LL and a flap facing a cog on cogged sector BB.
LL has a plastic bean pushing SW1 contacts and a foot facing the orbit of the pin of cogged ring R.
When the shutter is at rest position (uncocked) the levers are both rightward thus the SW1 is on
position B (see PIC 37). When the shutter is cocked the cogged sector BB rotating counter
clockwise pushes the flap of MM resulting on clockwise rotation of MM but at the same time the
pin on cogged sector BB closed to the foot of LL doesn’t permit the rotation of LL, thus SW1
remains on position B and the spring connecting MM to LL will be loaded. When shutter opens,
BB rotates back to its rest position taking off the pin from the foot and permitting LL to rotate
clockwise because its spring, thus moving SW1 to A position. When the shutter closes SW1 returns
back to B position. Definitely SW1 stays on A position while shutter is open.

SW2 (see PIC 35, 36 and 37) is the flash X synch contact, it is operated by a pin on the internal disk
N, and it will be closed when shutter is full open and opened when shutter is full close.

The diode D1 and trimmer resistor R1 are provided to cut-off the self inducted electromotive force
generated by the electromagnet solenoid, the cut-off is fine adjusted by trimmer R1 which is
accessible, through a hole, from the front side of the shutter (see PIC 41) but it is factory adjusted.
The electromagnet will be activated applying a voltage between its leads; the positive pole is
connected to the orange wire while the negative pole must be connected to the black wire to operate
that happens in this way:

• When the camera release button is half pressed the orange wire will be energized (time A

on PIC 38) (camera release button is double action, when half pressed it closes an electric
contact but you haven’t any feeling of that because notoriously any camera produced by
Bronica has the autofocus feature defective). When the button is full pressed it
mechanically starts the shot action.

• If the A/T selector is at A position the switch on the diaphragm value PCB AB (see PIC 44)

is closed so when SW1 achieves its A position the electromagnet is energized.

• At the same time the camera is sensing the blue wire, and when the voltage drops from

positive to zero, it starts a timer supplying power to the orange wire for the shutter open
time interval. (I.e. time B on PIC 38); note: at 1/500 of sec the electromagnet will be not
energized at all but the intrinsic delay of circuits (time D on PIC 38).

• When the shutter time has expired the orange wire will de-energized for a time, permitting

the shutter closing phase (time C on PIC 38).

• The camera senses the A/T selector using the yellow wire, in order to avoid energizing the

electromagnet if A/T selector is at T position.

25

Front side

PIC 39: Old and new style of Seiko shutter.

There are 2 types of Seiko shutters:

Old type used on Zenzanon S, M, MC lens, it has 7 aperture stops although mechanically it is

possible to hold the half position and the diaphragm acts according, the half position isn’t
notified to the metered prism. It is identifiable by the reddish printed circuit board with seven
resistors shaped like pillows on the upper side.

New type used on Zenzanon PS, PE lens, it has 13 aperture stops including the half positions

and it fully notifies that to the metered prism. The circuit board is green without any component
on the upper side.

TP1

HH

R1

PIC 40: Front cover ring: note the holes to access the trimmer R1 and test point TP1 (see PIC 37).

Note also the access to the screw to adjust the device HH (see PIC 28 and 31).

26

AB

AC

AD

AC

Contacts

Contacts

Trimmer R1

Springs

PIC 41: Shutter front with printed circuit board AB detached.

Contacts

A/T lever

connector

Connects

to U lever

Spring

PIC 42: A/T slide AC

27

Last

stop

ohms

ohms

ohms

ohms

ohms

ohms

ohms

Blue

Blue

White

Shutter

Frame

Contacts

Stop holes

Diaphragm ring

PIC 43: Inner ring

100

P13 P12 P11 P10 P3 P2 P1

A/T contact – Closed on A

100

100

Contact cursor

100

To Shutter PCB

100

100

Offset resistor
120 ohms

100

R1 R2 R3 R9 R10 R11 R12

Full open

PIC 44: Schematic diagram of the diaphragm value printed circuit board AB. (new style)

28

2 3 4 5 6 7 8 9 10 11 12 13

4

4

4

4

4

The shutter front side includes:
A front ring (AD on PIC 41) holding a printed circuit board (AB on PIC 41) and a slide (AC on PIC

41). There are a hole on AD permitting the access to the trimmer R1 (see PIC 37 and 33) and a slot
permitting the contacts of the inner ring to pass through.
The slide AC (see PIC 42) can stay on 2 positions depending on the A/T lever on the lens
(remember that on A position the shutter operates by the speed selected on the camera while on T
position the shutter is opened pushing the shutter release button and closed when the lever is moved
back to A position). When the slide AC is full leftward a slide contact closes a circuit on PCB AB,
and an extension on AC push the A/T selector latch U (see PIC 30) to A position. When AC is at
right position the contact is retracted from AB thus the circuit is open and the extension releases
A/T selector latch U to T position. AC has a spring grounded to AD pushing a ball to AC which has
two holes determining the two operative positions.
An inner ring (see PIC 43), which is driven by the diaphragm ring on the lens through 2
connectors, it is rotated by the front ring AD but only on 13 positions (7 on the old style shutter)
determined by a ball inserted between a spring on AD and 13 (7) holes drilled on it. The inner ring
also has the contacts pass through AD determining the resistance value used by metered prisms to
get the aperture value.
The diaphragm value printed circuit board AB acts like a discrete potentiometer: turning the
diaphragm ring the resistance between white wires and shutter frame (black wire) will change; the
resistance value is read by metered prisms to determine the present diaphragm aperture. The
metered prism always meters with full open diaphragm and must compensate for the current
diaphragm aperture using the resistance values. On the new style shutter there are 12 resistors and
an offset resistor while on the old style only 7 without offset resistor. The relation between F and
resistance in ohm should be:

F

2.8 3.5 4 5.6 8 11 16 22 32 45 64

ohms

1400 1300 1200 1000 800 600 400 200 100 ? ?

Table 6

I cannot get the last two values and by the way some lenses don’t show very precise values, that
because the way the system has been adapted to them. I.e. Zenzanon PS50 /3.5 at F22 reports 300
ohms but this value means an aperture between F16 and F22, that happens because the lens has only
12 stops instead of 13 and on the new style shutter PCB it isn’t possible to change the single
resistor.

Position 1
PS 35/3.5 3.5 22 X 3.5
PS 40/4 4 22 X X 4 5.6 8 11 16 22
PS 50/3.5 3.5 22 X 3.5
PS 65/4 4 22 X X 4 5.6 8 11 16 22
PS 80/2.8 2.8 22 2.8 4 5.6 8 11 16 22
PS 110/4 4 32
PS 135/4 4 32
PS 150/4 4 32
PS 180/4.5 4.5 32 X 4.5 5.6 8 11 16 22 32
PS 200/4.5 4.5 32 X 4.5 5.6 8 11 16 22 32
PS 250/5.5 5.6 45 5.6 8 11 16 22 32 45

5.6 8 11 16 22 32

5.6 8 11 16 22 32

5.6 8 11 16 22 32

5.6 8 11 16 22

5.6 8 11 16 22

Table 7 X means this position doesn’t exist.

On the table 7 is summarized the possible aperture values for the usual new style Zenzanon PS
lenses, to be noticed only 5 of them have the whole 13 positions.

29

Final notes

Seiko #0 shutter is a valuable piece of clockwork engineering although it has its own quirks:
It was projected in order to last in the time, less to be serviceable. For example, on excellence side,
every lever is bush mounted, and the slotted disk (A on PIC 1) turns on a special bearing done by
balls and cuprum segments in order to get lightness and elasticity (see PIC 45). On the other hand,
the cover of shutter chamber (see PIC 9) is hold by the four screws fixing the shutter body cup to
the base plate, causing the shutter blades falls all around when the shutter cup is removed,
furthermore there are some springs grounded to the internal side of shutter cup, that doesn’t help the
reassembly.

PIC 45: Balls-segments bearing.

Zenza Bronica, Zenzanon is a trademark of Tamron Industries; Seiko is a trademark of Seiko
Corporation

Disclaimer

I’m not responsible for any error, omission and/or inaccuracy in this document. I’m not associated
with any company or site mentioned on this document. I’m not associated with any service center.
I’ve not access to any official technical literature, every information on this document has been
collected examining the equipment or from the Internet when mentioned. I’m not a service
professional nor perform any service activity so please don’t ask me to do any kind of service.

Afterwords

You’re welcome to submit comments or information if you’d like to share ideas with other people.
This document could be copied and published but citing the source. Feel free to link this document.
My email address is [e-mail]

30

Appendix A

Lens pins

Disk A

Slot C

Roller C

Shutter

Lever G

Lever I

Slot E

Roller E

Diaphrag

Lever H

Displacement

from starting

position

Displacement

from starting

position

Displacement

from starting

position

Vertical

Position

Full

close

Displacement

from starting

position

Lock

Displacement

from starting

position

Displacement

from starting

position

Preset

position

Vertical

Position

No

activity

Lens pins

Disk A

Slot C

Roller C

Shutter

Lever G

Lever I

Slot E

Roller E

Diaphrag

Lever H

Displacement

from starting

position

Displacement

from starting

position

Displacement

from starting

position

Vertical

Position

Displacement

from starting

position

Shot

Displacement

from starting

position

Displacement

from starting

position

Preset

position

Vertical

Position

F Max

Displacement

from starting

position

TIME

Rear side mechanisms time diagrams

Cocking phase time diagram

Full open

F Min – Full open
F Max

Shooting phase time diagram

TIME

Full open
Full close

F Min – Full open

31

Appendix B

Lens pin diagram

Pin Shutter wire color Use

1 Black Ground, common lead
2 Green Flash contact
3 Yellow A/T Switch sense
4 Blue Electromagnet sense
5 Orange Magnet (Electromagnet) solenoid
6 White Diaphragm value

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