Polaroid Miniportrait 455 Repair Manual
Polaroid Miniportrait 455 Repair Manual

Polaroid Miniportrait 455 Repair Manual

Miniportrait camera
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Repair Manual
Miniportrait 455
September 1996
Americas Business Center
Technical Services
201 Burlington Road
Bedford MA 01730
TEL: 1.781.386.5309
FAX: 1.781.386.5988

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Summary of Contents for Polaroid Miniportrait 455

  • Page 1 Repair Manual Miniportrait 455 September 1996 Americas Business Center Technical Services 201 Burlington Road Bedford MA 01730 TEL: 1.781.386.5309 FAX: 1.781.386.5988...
  • Page 2: Table Of Contents

    Table of Contents Page Section 1 — General Description..............Specifications ....................Serial and Model Number Location ............... Section 2 — Operation ..................Shutter Charging (Cocking) ................Shutter Release ..................... Exposure Counting Mechanism ..............Exposure Mode Selection ................Single-Frame Exposure Action ..............Dual-Frame Exposure Action .................
  • Page 3 Shutter Disassembly ..................Removing the M. Blade Assembly as a Unit ..........Removing the Diaphragm Blade Assembly ..........Removing the Light Interception and Shutter Blades ....... Reassembling the Shutter ................Replacing the Light Interception and Shutter Blades ....... Replacing M. Blade/M.S. Disk and Motor Disk Assemblies ..... Mode Select Gear Reassembly ..............
  • Page 4 List of Illustrations Figure Page Model 455 Miniportrait Camera ............... Model 455 Camera Dimensions .............. Motor-Driven Shutter Charging ............... Main Lever Latching Action ..............Shutter Release Actions ................. Indexing Exposure Counter after Shutter Release ........M & MS Blade Rotation during Mode Selection ........Motor Rapid Stop Circuit during Mode Selection ........
  • Page 5 3-20 Diaphragm Blade Disassembly ............... 3-21 Removing Light Interception and Shutter blades ........3-22 Shutter and Light Interception Blade Reassembly ........3-23 Replacing the Diaphragm Blade Assembly ..........3-24 Reconnecting the Aperture Link Lever and Aperture Control Lever ..3-25 M. Blade Assembly Replacement ............3-26 M.
  • Page 6: Section 1 - General Description

    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. •...
  • Page 7: Model 455 Miniportrait Camera

    Figure 1-1. Model 455 miniportrait camera...
  • Page 8: Specifications

    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...
  • Page 9 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...
  • Page 10: Model 455 Camera Dimensions

    Figure 1-2. Model 455 camera dimensions...
  • Page 11: Serial And Model Number Location

    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...
  • Page 12: Section 2 - Operation

    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.
  • Page 13: Main Lever Latching Action

    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.
  • Page 14: Shutter Release

    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”...
  • Page 15: Exposure Counting Mechanism

    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.
  • Page 16: Exposure Mode Selection

    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.
  • Page 17: Motor Rapid Stop Circuit During Mode Selection

    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.
  • Page 18: Single-Frame Exposure Action

    MS Blade M Blade 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”...
  • Page 19: Shutter Blade Action In Single-Frame Exposure

    S4 Switch 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.
  • Page 20: Dual-Frame Exposure Action

    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).
  • Page 21: Electronic Circuit Functions

    Electronic Circuit Functions The electronic circuits of the Model 455 Miniportrait Camera are contained on four PC Boards: • Main PC Board (“Body Circuit”), inside the Camera Body; • Two Electronic Flash PC Boards, inside the Flash unit; • Sonar PC Board, on the underside of the Camera Body, inside the Bottom Cover. Although the Model 455 circuits employ the same operating principles as Model 403/203 circuits, there are some unique component/operating differences in the 455.
  • Page 22: Main Pc Board Schematic

    5. Once the Flash is charged, the green READY LED lights and the Flash Unit delivers a READY signal. Q7’s base is cut off, energizing the release magnet circuit. 6. During the motor run and shutter charging, the OSC STOP terminal (CN4-4) is grounded, stopping flash oscillation and interrupting capacitor charging to avoid the effects of voltage drop.
  • Page 23: Electronic Flash Pc Boards

    Electronic Flash PC Boards (Figure 2-10 and 2-11) Note: Text in boldface type denotes a difference between Model 455 & 403. 1. With the Power Switch ON, the Flash Unit set and its Power Switch ON, flash circuit oscillation is started by push-pull oscillators Q7 through Q10 and step-up Transformer T1.
  • Page 24 5. After IC2 radiates ultrasound burst signals, it supplies 93 kHz divided-frequency pulses from its OSC pin. Q4 level-shifts the pulses & inputs to IC4. 6. IC4 checks the distance parameters of 1.2m/1.92m. If the subject is closer than 1.2m, left-hand LED2 lights.
  • Page 25: Electronic Flash Pc Boards Schematic

    Figure 2-11. Electronic flash PC board schematic...
  • Page 26: Sonar Pc Board Schematic

    Figure 2-12. Sonar PC board schematic...
  • Page 27: Camera Wiring Diagram

    Camera Wiring Diagram Figure 2-13. Camera Wiring Diagram...
  • Page 28: Section 3 - Disassemblly And Reassembly

    Section 3 - Disassembly and Reassembly General Guidelines, Tools and Cautions Guidelines These instructions describe disassembly and reassembly of the 455’s main components: Camera Body, Handgrip, Viewfinder, Electronic Flash and Shutter. Follow the order of the circled numbers ( 1 3 ) on the accompanying drawings for the disassembly sequence and reassemble in the reverse order unless stated otherwise.
  • Page 29: Tools Required

    455 - 403 Similarities Although the Model 455 is very similar to the 403 Miniportrait in design and operation, the only identical assemblies are the hand grip assembly and sonar PC board assembly. Numerous other components are also shared between the two models, as shown in the “common use”...
  • Page 30: Camera Body Disassembly And Reassembly

    Camera Body Disassembly and Reassembly (Figures 3-1 through 3-3) This procedure describes removing and replacing components and assemblies from the front, back, bottom, and interior of the camera body. Other assemblies such as the flash unit, viewfinder and handgrip are covered later in separate procedures.) If all camera body components are to be removed, the removal sequence shown below can be followed.
  • Page 31 Recommended sequence if ALL components are removed (same as circled numbers on Figure 3-1): 1 Holder frame assembly 6 Front Panel Assembly 2 Light Baffle Frame 7 Bottom Cover 3 Main PC Board 8 Sonar 4 Lenses Shafts (Camera interior) 5 Decoration Cover 10 Shutter Mechanism Additional notes for specific parts...
  • Page 32: Camera Body Components Disassembly

    wheel (Figure 3-29). Then engage the hold in the Mode Select slide with the pin on the Mode Select lever. In the same way, engage the holes in the Aperture slide and Shutter Speed slide with their corresponding lever pins. •...
  • Page 33: Hand Grip Disassembly And Reassembly

    Hand Grip Disassembly and Reassembly Note: The 455 Hand Grip Assembly is identical to the one used in later (after #1854) 403’s. Disassembly • Disassemble in the sequence shown by the circled numbers 1 on Figure 3-2. As screws are removed, set them aside grouped according to the steps performed.
  • Page 34: Hand Grip Disassembly

    Figure 3-2. Hand grip disassembly...
  • Page 35: Viewfinder Disassembly And Reassembly

    Viewfinder Disassembly and Reassembly Disassembly • Disassemble in the sequence shown by the circled numbers ( 1 3 ) on Figure 3-3. As screws are removed, set them aside in separate groups, according to the steps performed (three different screw sizes are used in the Viewfinder). Figure 3-3.
  • Page 36: Reassembly

    • If access to the interior of the Viewfinder is needed, do only 1 through 5 . If the Viewfinder must be removed from the Camera Body, continue with • 6 , the six wires from the Main PC Board which are fed through the Camera Body must be unsoldered from the PC Plate, before the Viewfinder inner housing can be removed from the Camera Body (Figure 3-5).
  • Page 37: Bright Frame Reassembly

    • When replacing the Outer Housing, be sure the Bright Frame “b” (Figure 3-7) is in front of the molded support “c” on the inside of the Outer Housing, and that support “c” does not bind the Bright Frame after assembly. Note: The Eye Cup is mounted with its thicker vertical edge “d”...
  • Page 38: Removing The Electronic Flash Assembly

    Removing the Electronic Flash Assembly Note: Flash Unit can be removed as an entire assembly, if desired. Disconnect wiring ( ) and remove nuts from Holder bolts. • Remove parts in the order of the circled numbers on Figure 3-9. Keep the screws in groups according to locations and removal order.
  • Page 39 • Stock spare Decoration Plates in case of damage during disassembly. • when removing the Click Plate, use care to prevent losing the two small steel ball bearings located in recesses on the underside of the Click Plate. • 6 , & Unplug connector from CN4 on the Main PC Board.
  • Page 40: Replacing The Electronic Flash Assembly

    Replacing the Electronic Flash Assembly • Do 1 through 13 on Figure 3-9 in reverse order. • If the Left Holder 11 was removed from the Flash Assembly, on reassembly be sure the molded pin on the Left Hub is positioned as shown in Figure 3-10; at approximately 8 o’clock, above the arm of the Flash Switch.
  • Page 41: Electronic Flash Disassembly

    Electronic Flash Disassembly Note: (With Flash Unit removed from Camera — see removal procedure in this Section. • Remove parts in the sequence shown by the circled numbers on Figure 3-11. • In 3 , pry off the Diffuser by inserting a thin blade in the slot between the Diffuser and the Front Case.
  • Page 42: Electronic Flash Unit Disassembly

    Figure 3-11. Electronic flash unit disassembly...
  • Page 43: Replacing The Motor

    Replacing the Motor Note: The Shutter Assembly can remain in the Camera. • Remove the Pack Film Holder Frame and Light Baffle (See Camera “Body Disassembly”). • Unsolder the orange (+) and black (-) leads from Motor. • To remove the Motor Disk with Motor on it, remove the six mounting screws (Figure 3-12).
  • Page 44: Removing The Shutter Assembly

    Removing the Shutter Assembly • Remove the Pack Film Holder Frame, Light Baffle, Bottom Cover, Lenses and Front Panel (See Camera Body Disassembly). • Unplug connectors from CN1 and CN3 on the Main PC Board (Figure 3-13A). • Disconnect the brown and white wires from CN1 (press on terminal catch, through opening in side of connector (Figure 3-13B).
  • Page 45 Main PC Board X-Sync Connections Removing Leads Figure 3-13. Removing Shutter Assembly from Camera Body...
  • Page 46: Shutter Disassembly

    Shutter Disassembly This section explains how to remove the M. Blade and Diaphragm Blade Assemblies from the back of the Shutter, after the Shutter Assembly has been removed from the Camera. If further disassembly is required, or components on the front of the Shutter require servicing, see Plates 8 - 13 in the 455 Parts Catalog.
  • Page 47 • Remove the Exposure Counter Lever. • Remove the E-Ring “d” from the Exposure Counter Ratchet Gear “e”. Now remove the Gear and the E-Ring and Washer beneath it. • Remove the screw securing the M. Switch “f”, then remove the M. Switch and Washer (Figure 3-15).
  • Page 48 Figure 3-16. Removing M. blade assembly from shutter Figure 3-17. M. blade assembly component parts...
  • Page 49: Removing The Diaphragm Blade Assembly

    Removing the Diaphragm Blade Assembly • From the front side of the Shutter Assembly, remove the two E-rings from the pin at the end of the Aperture Link Lever. (One E-ring secures the Aperture Control Lever link to the pin, the other E-ring is on the pin below the link (Figure 3-18. Figure 3-18.
  • Page 50: Diaphragm Blade Disassembly

    • If the Diaphragm Blade Assembly itself must be disassembled, refer to the exploded view, Figure 3-20. Figure 3-20. Diaphragm blade disassembly...
  • Page 51: Removing The Light Interception And Shutter Blades

    Removing the Light Interception and Shutter Blades • Remove the Fixing Disk from the Base Ring (Figure 3-21) by removing the four mounting screws. • Remove the Shoulder Screw from the center of the Light Interception Blade. Note: The positions of the Light Interception and Shutter Blades relative to their actuating pins, as the Blades are removed.
  • Page 52: Reassembling The Shutter

    Reassembling the Shutter Replacing the Light Interception and Shutter Blades • Replace the Shutter Blade in the Base Plate/Base Ring, with pins “a” and “b” located as shown in Figure 3-22A. • Place the Light Interception Blade on top of the Shutter Blade, with pins “a” and “b” located as in Figure 3-22B.
  • Page 53: Replacing The Diaphragm Blade Assembly

    Replacing the Diaphragm Blade Assembly • Secure the Diaphragm Blade Assembly to the Base Ring with four screws (Figure 3-23). Figure 3-23. Replacing the diaphragm blade assembly • From the front of the Shutter, replace the lower E-Ring “a” on the Aperture Link Lever pin (Figure 3-24).
  • Page 54: Replacing M. Blade/M.s. Disk And Motor Disk Assemblies

    Replacing the M. Blade/M.S. Disk and Motor Disk Assemblies • Replace the M.S. Disk, attached to the M. Blade Assembly, in the Base Ring. Be sure the pins of the Mode Select Levers are correctly inserted in their holes and that the S.
  • Page 55: M. Blade Assembly Components

    • Replace the Mode Switch on the M.S. Disk. • On the Exposure Counter Indicator shaft, replace the Washer, E-Ring, Ratchet Wheel and final E-Ring. • Replace the Exposure Counter Lever on its pivot pin, then reconnect the Spring between the Lever and the Pawl. Note: BEFORE REPLACING THE MOTOR DISK, PERFORM THE MODE SELECT GEAR REASSEMBLY PROCEDURE.
  • Page 56: Mode Select Gear Reassembly

    Mode Select Gear Reassembly • Set Portrait Selector for four identical pictures. • Remove E-ring from gear A ; lift off gears A and B . • Turn gear C until all four exposure windows are open. Screw heads on gear will be positioned as shown ( 2 , o’clock).
  • Page 57: Replacing The Shutter Assembly In The Camera

    Replacing the Shutter Assembly in the Camera • Insert the reassembled Shutter Assembly into the Camera Body from the front. Secure it with four screws at the corners of the Base Plate. Caution Don’t let wires become pinched between Base Plate and Camera Body! Refer to Figure 3-31 for wiring placement.
  • Page 58: Correct Mounting Of Bottom Frame

    Figure 3-29. Correct mounting of bottom frame • Install the four brass Shafts, using four screws, as shown in Figure 3-28. Be sure Shaft seats fully into the hole on the inside of the Camera Body. • Replace the Light Baffle, Bottom Cover, Pack Film Holder Frame, Front Panel Assembly, Decoration Cover, Lenses and Lens Caps (see “Camera Body Disassembly and Reassembly”...
  • Page 59: Front Panel Replacement

    Figure 3-30. Front panel replacement Figure 3-31. Wiring placement...

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