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Repair Manual
Americas Business Center
Technical Services
201 Burlington Road
Bedford MA 01730
TEL: 1.781.386.5309
FAX: 1.781.386.5988
Miniportrait 455
September 1996
2
Table of Contents
Page
Section 1 — General Description..................................................................... 6
Specifications ................................................................................................ 8
Serial and Model Number Location ............................................................... 11
Section 2 — Operation...................................................................................... 12
Shutter Charging (Cocking) ........................................................................... 12
Shutter Release............................................................................................. 14
Exposure Counting Mechanism..................................................................... 15
Exposure Mode Selection.............................................................................. 16
Single-Frame Exposure Action...................................................................... 18
Dual-Frame Exposure Action......................................................................... 20
Electronic Circuit Functions........................................................................... 21
Main PC Board ......................................................................................... 21
Electronic Flash PC Boards ..................................................................... 23
Sonar PC Board ....................................................................................... 23
Camera Wiring Diagram................................................................................ 27
Section 3 — Disassemblly And Reassembly .................................................. 28
General Guidelines, Tools and Cautions ....................................................... 28
Guidelines ................................................................................................ 28
Tools Required ......................................................................................... 29
Cautions ................................................................................................... 29
Camera Body Disassembly and Reassembly................................................ 30
Hand Grip Disassembly and Reassembly ..................................................... 33
Disassembly ............................................................................................. 33
Reasembly................................................................................................ 33
Viewfinder Disassembly and Reassembly..................................................... 35
Disassembly ............................................................................................. 35
Reassembly.............................................................................................. 36
Removing the Electronic Flash Assembly ..................................................... 38
Replacing the Electronic Flash Assembly ..................................................... 40
Electronic Flash Disassembly........................................................................ 41
Replacing the Motor....................................................................................... 43
Removing the Shutter Assembly.................................................................... 44
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Shutter Disassembly...................................................................................... 46
Removing the M. Blade Assembly as a Unit ............................................ 46
Removing the Diaphragm Blade Assembly .............................................. 49
Removing the Light Interception and Shutter Blades ............................... 51
Reassembling the Shutter ............................................................................. 52
Replacing the Light Interception and Shutter Blades ............................... 52
Replacing M. Blade/M.S. Disk and Motor Disk Assemblies ..................... 54
Mode Select Gear Reassembly................................................................ 56
Replacing the Shutter Assembly in the Camera ............................................ 57
4
List of Illustrations
Figure Page
1-1 Model 455 Miniportrait Camera............................................................... 7
1-2 Model 455 Camera Dimensions.............................................................. 10
2-1 Motor-Driven Shutter Charging............................................................... 12
2-2 Main Lever Latching Action..................................................................... 13
2-3 Shutter Release Actions ......................................................................... 14
2-4 Indexing Exposure Counter after Shutter Release.................................. 15
2-5 M & MS Blade Rotation during Mode Selection...................................... 16
2-6 Motor Rapid Stop Circuit during Mode Selection.................................... 17
2-7 Rotational Control of M & MS Blades...................................................... 18
2-8 Shutter Blade Action in Single-Frame Exposure..................................... 19
2-9 Shutter Blade Action in Dual-Frame Exposure ....................................... 20
2-10 Main PC Board Schematic ...................................................................... 22
2-11 Electronic Flash PC Boards Schematic .................................................. 25
2-12 Sonar PC Board Schematic .................................................................... 26
2-13 Camera Wiring Diagram ......................................................................... 27
3-1 Camera Body Components Disassembly................................................ 32
3-2 Hand Grip Disassembly ......................................................................... 34
3-3 Viewfinder Disassembly ......................................................................... 35
3-4 Removing Viewfinder Front Cover .......................................................... 35
3-5 Unsoldering PC Plate leads (Viewfinder)................................................ 36
3-6 Shutter Button Reassembly .................................................................... 36
3-7 Bright Frame Reassembly....................................................................... 37
3-8 Eye Cup, Front Glass and Front Cover Reassembly .............................. 37
3-9 Removing Electronic Flash Assembly..................................................... 38
3-10 Left Hub Pin Position (Electronic Flash) ................................................. 40
3-11 Electronic Flash Unit Disassembly.......................................................... 42
3-12 Removing the Motor Disk and Motor....................................................... 43
3-13 Removing the Shutter Assembly from Camera Body............................. 45
3-14 Disassembling Exposure Counter Components...................................... 46
3-15 Disassembling M. Switch, S. Set Cam, Lever Components.................... 47
3-16 Removing the M. Blade Assembly from Shutter..................................... 48
3-17 M. Blade Assyembly Component Parts................................................... 48
3-18Aperture Link Lever Pin Connection to Aperture Control Lever..............49
3-19 Removing the Diaphragm Blade Assembly............................................. 49
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3-20 Diaphragm Blade Disassembly............................................................... 50
3-21 Removing Light Interception and Shutter blades.................................... 51
3-22 Shutter and Light Interception Blade Reassembly.................................. 52
3-23 Replacing the Diaphragm Blade Assembly............................................. 53
3-24Reconnecting the Aperture Link Lever and Aperture Control Lever.......53
3-25 M. Blade Assembly Replacement ........................................................... 54
3-26 M. Blade Assembly Components ............................................................ 55
3-27 Reassembling Mode Select Gears.......................................................... 56
3-28 Replacing Shutter Assembly in the Camera Body .................................. 57
3-29 Correct Mounting of Bottom Frame......................................................... 58
3-30 Front Panel Replacement ...................................................................... 59
3-31 Wiring Placement................................................................................... 59
List of Tables
Table Page
3 -1 Removing Individual Components from Camera Body ........................... 30
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Section I - General Description
The Miniportrait Camera is a hand-held or tripod-mounted photo camera designed to
meet a variety of photo identification needs. The 455 permits:
• Three portrait print combinations: four identical portraits, two pair of identical
portraits, or four different portraits on each sheet of Polaroid 4 x 5" (9 X 12 cm) instant
pack film.
• Color or Black and White Prints using any of four Polaroid film types (See
Specifications). Polacolor prints made by the Model 455 meet the requirements for
U.S. Passports.
• Subject lighting by direct or reflected flash, using built-in electronic flash;
supplementary, synchronized electronic flash; or tungsten illumination with
high-speed black-and-white films.
• Sharp focus and correct image size with built-in sonar rangefinder.
• Film processing timing with an adjustable countdown timer on the side of the Camera.
• Remote shutter release with 39" (1M) accessory cable.
• Choice of nine apertures and two shutter speeds for optimum exposure quality.
• Operation on four internal AA batteries, or external AC for high-volume
applications.
• Accessories available include supplementary lenses to allow more than one person
in each portrait; remote shutter release cable; extra film holders for easy
interchangeability between different films; an adapter for AC operation; and a cord for
syncing an auxiliary camera. See Specifications in the following paragraph for more
detail.
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Figure 1-1. Model 455 miniportrait camera
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Specifications
Film Types*:
559 Polacolor ER (80/20) - ideal for color portraits
552 PolaPan (400/27) - fine grain B&W positive prints
553 B& W (800/30) - similar to 552 but coaterless
554 B&W (100/21) - similar to 553 but lower speed
Film Holder*: Model 550 (PID 604030) - sold separately
Controls and Connectors and Indicators (Figure 1-1)
Camera ON/OFF Switch
Distance Selector: 1.5 or 1.9m (59 or 74")
Apertures: f/8 to f/32
Flash Brightness Switch for 80/100 & 400/800 speed films
Shutter Speeds: 1/60th & 1/125th sec.
Portrait Selector: 4 identical, 2 pairs of identical, or 4 different images.
Shutter Button
Portrait Counter
Flash Tilt Knob
Auxiliary Camera X-Sync Socket
Remote Shutter Release Socket
AC Adapter Socket
Flash Ready LED
Correct Focus LEDs (in Viewfinder)
Film Development Timer: Countdown type, time selectable, beeps at interval end.
Power: Four AA batteries in Hand Grip or AC with Adapter (See Accessories)
Camera Size: See Figure 1-2
Accessories: Remote Shutter Release Cable PID 612412 1m (39") long.
Supplementary Lenses 78A PID 603864: produce a smaller subject size, allowing more
than one person in each portrait.
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AC Adapters: For 100V supply - PID 612559
For 120V supply - PID 612411
For 220V supply - PID 612427
For 240V supply - PID 612698
Caution
USE OF OTHER ADAPTERS MAY DAMAGE CAMERA
* Polaroid 4 x 5" sheet films can also be used with the Model 455, in a Model 545 Film
Holder, but image area will be off center (See Note at bottom of page 4 of Instruction
Booklet).
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Figure 1-2. Model 455 camera dimensions
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Serial and Model Number Identification
The Model 455 Miniportrait Camera has a decal on the back of the body, below the Pack
Film Holder, showing the following information:
Polaroid Miniportrait Camera Model 455
Serial Number
J 0 0050 B
B = configuration code
0050 = 50th unit manufactured
0 = Year produced (1990)
J = Month produced (Sept., since J is
the ninth letter of alphabet; letter I not used).
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Section 2 - Operation
Shutter Charging (Cocking) (Figures 2-1 and 2-2)
1. As the motor runs, gear (a) rotates cam (b).
2. Cam (b) deflects the pin at the end of lever (c), moving lever (c) and turning gear
segment As the segment pivots, it turns the cocking lever (e) counter-clockwise. The
main lever (f) is also turned counter-clockwise, in its charging direction.
3. Pin (e’), attached to the underside of cocking lever (e), now moves the light interception
blade (g) back and forth as indicated in the drawing.
4. As main lever (f) turns, the pin on its nearer end rotates the shutter blade (h).
Figure 2-1. Motor-driven shutter charging
Motor
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5. No exposure of the film occurs during this shutter charging process, since the ears on
the light interception blade (g) cover the exposure holes in the shutter blade (h), and
both blades turn together in this shutter charging process.
6. The main lever (f), shown in a top view in Figure 2-2 continues to rotate and turns the
magnet set lever (i) clockwise. Hook (j) linked to the magnet set lever is attracted to
the magnet.
7. Main lever (f) now reverses its direction (U-shaped arrow, Figure 2-2), because of the
action of cam (b) (Figure 2-1). The tooth at the end of the main lever latches to the
hook (j). Shutter blade (h) is now charged (cocked); the cocking lever (e) and light
interception blade (g) return to their original positions.
Figure 2-2. Main lever latching action
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Shutter Release (Figure 2-3)
1. As the shutter is released, the magnet set lever is pulled away, hook (j) is unlatched
from main lever (f), and charge spring “C” actuates the shutter.
2. In a 1/60th-sec. exposure, shutter speed is reduced by pin “B” on the main lever (f)
striking the shock-absorbing cam “A” midway in its rotation.
3. In a 1/125th-sec. exposure, the shock-absorbing cam “A” is moved out of the path of
pin “B” by the speed selector lever, allowing spring “C” to drive the shutter blade with
maximum speed.
4. Just before shutter release is completed, the main lever (f) closes the shutter switch
(S4 in Figure. 2-5) to start the motor.
Figure 2-3. Shutter release actions
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Exposure Counting Mechanism (Figure 2-4)
1. As the motor runs and turns gear (a), an eccentric crank pin on the gear causes
lever (b) to move back and forth.
2. As lever (b) moves laterally back toward the motor, its hook end engages a tooth of
gear (c) and indexes it one notch. The exposure counter dial correspondingly rotates
one count.
3. To prevent lever (b) during its opposite travel from rotating gear (c) backwards,
pawl (d) pulls in and locks the gear against backward rotation.
Figure 2-4. Indexing exposure counter after shutter release
Eccentric Cam
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Exposure Mode Selection (Figures 2-5 through 2-7)
1. As the motor runs, cam (B) at the end of the gear train (bottom of Figure. 2-5) rotates
disc (A) counterclockwise one-quarter of a turn. The mode blade (a) also rotates
counterclockwise.
2. Spring (a’) links the M blade (a) to disk (A), and spring (b’) links the MS blade (b) to
disc (A), turning these blades in the direction shown by the arrows. The M blade (a)
and MS blade (b) cover the exposure windows in the shutter blade, according to their
respective exposure modes.
Figure 2-5. M & MS blade rotation during mode selection
S4 Switch
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3. As cam (B) turns through the action of the gear train, an arm of the S4 switch (C) drops
into a valley on the cam, opening S4 (turning it OFF).
4. When S4 is driven to an OFF position, gate G of Q8 (Figure 2-6) goes high, activating
Q8 to short the motor input power and bring it to a rapid stop.
Figure 2-6. Motor rapid stop circuit during mode selection
5. To achieve the correct exposure action, the rotation of the M blade (a) and MS
blade (b) is controlled by pins (d’) and (d). These pins are moved up or down by the
cam “steps” on the ends of the mode select lever “A” shown in the circled areas of the
illustration. The pins are thus in or out of the rotational paths of the blades, preventing
or allowing blade rotation (see the three circled areas at right in illustration).
The M and MS blades, therefore, rotate or remain fixed, according to the exposure
mode selected (single-, dual-, or 4-frame. The operation of each of these modes will
now be explained in more detail.
SR Switch
Motor
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Figure 2-7. Rotational control of M & MS blades
Single-Frame Exposure Action (Figure 2-8)
1. As described previously, when disk (A) rotates, the M blade (a) and MS blade (b),
coupled to the disk by springs, also rotate. But their degree of rotation is controlled by
the mode select pins (d) and (d’), resulting in the disk positions shown, Windows “A”,
“B” and “D” are blocked and only a single exposure window (“C”) remains open.
2. When the shutter is released, disk (A) begins turning again, driven by the motor.
The rotational forces applied to the M blade (a) and MS blade (B) by springs (a’)
and (b”), however, momentarily overpower the motor force. This causes the mode
select pins (d) and (d’) to momentarily deflect out of the way of (a’) and (b’) (dotted
paths), permitting the blades to turn freely.
MS Blade
M Blade
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Figure 2-8. Shutter blade action in single-frame exposure
3. As disk (A) rotates further (as in 1. above), (a2) and (b2) are controlled by pin (d),
and (b3) is controlled by (d’). The three exposure windows “A”, “B” and “D” are again
blocked.
4. When the foregoing process has been repeated three more times, the single film
frame in the film holder will have four separate portrait exposures on it.
S4 Switch
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Dual-Frame Exposure Action (Figure 2-9)
1. In this mode, disk (A), the M and MS blades and other components behave in a similar
fashion to the single frame mode, except for the following:
2. As shown in the lower half of Figure 2-9, the step cams at the ends of the mode select
lever move pins (d) and (d’) out of the way of the MS blade (b), permitting it to rotate
freely with disc (A). Thus the MS blade (b) stops at the position shown, resulting in
exposure windows “A” and “C” being blocked, and “B” and “D” open for a dual-frame
exposure.
Figure 2-9. Shutter blade action in dual-frame exposure
MS Blade
M Blade
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