Polaroid Joshua Vision, Joshua JoyCam, Joshua Captiva Service Manual
Repair Manual
Americas Business Center
Technical Services
201 Burlington Road
Bedford MA 01730
TEL: 1.781.386.5309
FAX: 1.781.386.5988
Joshua
(Vision/JoyCam/Captiva)
April 1993
Polaroid Josh ua Camera
Service Manual
T able of Contents
1. Description ............................................................................................................... 1-1
Introduction ............................................................................................................... 1-3
Unique Joshua Differences........................................................................................ 1-2
In-Camera Picture Storage .................................................................................. 1-4
Compact Camera Size ......................................................................................... 1-5
Uniqu e M icroprocess o r Con trolled E xpo sur e Syst em.......................................... 1-7
Key Joshua Features ................................................................................................. 1-8
Us ing th e C amera ...................................................................................................... 1-10
Loading Fi lm....................................................................................................... 1-10
Erecting C amera.................................................................................................. 1-10
Taking Pi cture ..................................................................................................... 1-11
Brigh tness Adj ustment and Self- Timer ................................................................ 1-12
Major Functional Sub-Systems of the JoshuaCamera................................................ 1-13
Erecting, Viewfin der an d C amera Opt ical S yst em ............................................... 1-13
Drive an d Switc hin g S ystem................................................................................ 1-16
Shutt er S yst em .................................................................................................... 1-18
Film Frame Transp ort and Spre ading .................................................................. 1-21
Specific ation Su mmary ............................................................................................. 1-23
Camera C ompone nts , Cov ers and P ane ls ................................................................... 1-24
2. Theor y o f Operati on................................................................................................ 2-1
Seque nce o f Oper ation .............................................................................................. 2-3
Stages o f Oper ation ................................................................................................... 2-3
Loading Fil mpack into E rected or Fo lded C amera............................................... 2-3
Power ing Folde d C amera for Da rk -Sl ide when Fil mpack is Ins erted................... 2-6
Power ing Camera w hen Film Do o r is Closed , L atched and then Erected............. 2-8
Maintain ing Po wer fo r Proc ess ing after Camera is F olded................................... 2-9
Darks lide Transpo rt and Count er Wheel Indexing ............................................... 2-11
TC - 2
Expos ing the Pi cture............................................................................................ 2-12
Blocking th e Vi ewf inder ..................................................................................... 2-13
Releasin g the Taking Mirror................................................................................ 2-14
Proce ssi ng the Ex pos ed Fra me ............................................................................ 2-16
Reseatin g the Taking Mi rro r and Op eni ng the Vi ewf ind er Blind ......................... 2-19
Special Cases............................................................................................................. 2-23
Darkslide when Film Door is Opened and Closed ............................................... 2-23
Fo lding the Camer a durin g a Proce ssi ng Cyc le.................................................... 2-24
Safety C lut ch on Feed Ro ll .................................................................................. 2-24
Syste m S chematic...................................................................................................... 2-24
3. Testing and Adjus tments ........................................................................................ 3-1
General...................................................................................................................... 3-3
Required Equipme nt ............................................................................................ 3-3
Descr iption o f E qui pment.................................................................................... 3-3
Tes ting ...................................................................................................................... 3-5
Ambient Ex posure Test ....................................................................................... 3-5
Strob e Exposure Test........................................................................................... 3-8
Adju stm ents .............................................................................................................. 3-10
Ambient Exposure Calibration ............................................................................ 3-10
Strob e Exposu re Calibr ation ................................................................................ 3-12
4. Disassembly and Reassembly.................................................................................. 4-1
Introduc ti on............................................................................................................... 4-4
Special Tools and Eq uipment Needed ....................................................................... 4-4
Disas sem bly and Assem bly Pr ocedur es ..................................................................... 4-5
Rear Panel ................................................................................................................. 4-5
Remov al .............................................................................................................. 4-5
Disa ssemb ly ........................................................................................................ 4-5
Reas sembl y ......................................................................................................... 4-7
TC - 3
Front Panel ................................................................................................................ 4-8
Removal .............................................................................................................. 4-8
Reassembly ......................................................................................................... 4-8
Left Hand G rip and Bottom Chu te Cover .................................................................. 4-9
Remov al.............................................................................................................. 4-9
Reas s embl y ......................................................................................................... 4-9
Bottom C hu te Cov er.................................................................................................. 4-10
Disa sse mb ly ........................................................................................................ 4-10
Reas s embl y ......................................................................................................... 4-10
Right Hand Grip ........................................................................................................ 4-11
Disasse mbly ........................................................................................................ 4-11
Reassembly ......................................................................................................... 4-11
Bottom D oor A ss emb ly ............................................................................................. 4-12
Remov al.............................................................................................................. 4-12
Disa sse mb ly ........................................................................................................ 4-12
Reas s embl y ......................................................................................................... 4-15
Top Cov er ................................................................................................................. 4-16
Remov al.............................................................................................................. 4-16
Reas s embl y ......................................................................................................... 4-17
Shutt er Assemb ly ...................................................................................................... 4-18
Remov al .............................................................................................................. 4-18
Disa ssemb ly ........................................................................................................ 4-22
Reas sembl y ......................................................................................................... 4-27
Erect Syste m (V MC /Bello ws and T aking Mir ror Ca rrier A ss emblies )....................... 4-28
Disa sse mb ly ........................................................................................................ 4-28
Reas s embl y ......................................................................................................... 4-30
Main Fra me (Non -Ge ar Sid e) .................................................................................... 4-31
Disa sse mb ly ........................................................................................................ 4-31
Reas s embl y ......................................................................................................... 4-32
TC - 4
Main Frame (Gear Side - Outer) ............................................................................... 4-33
Disassembly ........................................................................................................ 4-33
Reassembly ......................................................................................................... 4-34
Main Fra me (Gear Side - Inner) ................................................................................ 4-35
Disa sse mb ly ........................................................................................................ 4-35
Reas s embl y ......................................................................................................... 4-35
5. Troubleshooting ..................................................................................................... 5-3
Introduct ion .............................................................................................................. 5-3
Functional Test of a Joshua Camera .......................................................................... 5-5
Tools and Parts Needed for Troubleshooting ............................................................ 5-7
Common Camera Failure Modes and Corrective Procedures.................................... 5-8
Isola ting t he Pro blem ( Camera Mainf rame o r Shut ter A s sem bly?) ............................ 5-12
Appendix ................................................................................................................. A-1
Glossary of Terms to Describe the Joshua Cameras ................................................. A-2
TC - 5
[This p age inte ntionally blank]
1. Description
1 - 1
1. Description
T able of Contents
Intr od uc tion........................................................................................................................... 1-3
Unique Joshua Differences.................................................................................................... 1-4
In- C amera Pict ure St orage.............................................................................................. 1-4
Compact Camera Size ..................................................................................................... 1-5
Uniqu e M icroprocess o r Con trolled E xpo sur e Syst em...................................................... 1-7
Key Joshua Features ............................................................................................................. 1-8
Us ing th e C amera .................................................................................................................. 1-10
Loading Fi lm................................................................................................................... 1-10
Erecting C amera.............................................................................................................. 1-10
Taking Pi cture ................................................................................................................. 1-11
Brigh tness Adj ustment and Self- Timer ............................................................................ 1-12
Major Function al Sub -Sy ste ms of the Jos hu a Camera ........................................................... 1-13
Erecting, Viewfin der an d C amera Opt ical S yst em ........................................................... 1-13
Drive an d Switc hin g S ystem............................................................................................ 1-16
Shutt er S yst em ................................................................................................................ 1-18
Film Frame Transp ort and Spre ading .............................................................................. 1-21
Specific ation Su mmary ......................................................................................................... 1-23
Camera C ompone nts , Cov ers and P ane ls ............................................................................... 1-24
1 - 2
1 . Descri pti on
Introduction
The Polar oid Joshua is a com pact, fol din g, s in gle -le ns reflex c ame ra whi ch s to res it s o wn fin ish ed pic tur e s
and the darkslide. Camera operation is fully automatic and produces 10 full-color, instant Polaroid pictures
from one Joshua film pack. Picture format can be either vertical or horizontal.
The Joshua camera has an integral, fully automatic electronic flash; through-the-lens reflex viewing; and a
unique microprocessor- controlled exposure process.
Joshua Instant Color Film has an image area of 7.29 x 5.46 cm (2.87 x 2.15 inches). Each 10-exposure film
pack contains an integral, mercury-free battery for powering the Camera electronics and motor drive
systems.
Fi gure 1 -1 . J os h ua Single -Len s R eflex In s tan t Came ra
1 - 3
Unique Joshua Differences
Three major, unique design goals have been successfully achieved in the Joshua Camera:
• Storage of finished pictures within the Camera
• Co mpa ct size with extre mely r u gged con s truction
• Improved exposure control and picture sharpness under vi r tually all lighting conditions
Each of these Joshua d ifferences will now be briefly describ ed.
In-Camera Picture Sto r age
Each film frame after exposure is picked and driven by feed rollers into a semi-circular chute chamber . . .
makes a U-turn . . . is fed into the processing rollers (spread system) . . . and picked a second time into a
storage chamber (Figure 1-2). The process is repeated for all subsequent exposures, placing all frames
(including the initial darkslide) in the camera storage chamber. The picture counter decrements one count
each time another frame is processed.
The last picture taken is visible through the storage chamber window. Finished pic tures may be removed/
replaced from the cha mber at a n y tim e.
Figure 1-2. Film frame moved through chute by feed rollers, into spread system
and finally i nto st orage cham ber on undersi d e of C ame ra
1 - 4
Compact Camera Size
When folded, the Joshua Camera measures about 57 x 96 x 180 mm (2.25 x 3.79 x 7.1") and weighs 760
gm ( 2 7 o z) w it h a full fi lm pack.
The C ame ra is erected b y h old ing th e c amera as sh o wn an d depress ing th e R ele ase Button L atc h o n t he
Strob e Tower w ith your right thu mb (Figur e 1-3). Erecting the Camera automatically charges the Strob e,
wh en a f ilm pa ck i s i n p lac e.
F igu re 1-3. Erect ing an d C oll apsing th e C ame ra
1 - 5
Film Loading and Picture Removal Doors provide access to the film pack compartment and the picture
chamber, respectively (Figure 1-4). Loading a film pack into the Camera and closing the Film Door brings
the pack to the image plane and automati cally transports the darkslide into the storage chamber, unless this
chamber is full. If it is, a warning LED will light and an audio signal wi ll sound, and darkslide will occur
after the picture storage chamber has been emptied.
Up to ten finished (processed) pictures may be removed and also re-inserted, if desired, in the picture
chamber, by opening the Picture Removal Door.
Figure 1-4. Access to the Film Pack and Picture Storage Areas
1 - 6
Unique Microprocessor-Controlled Exposure System (Figure 1-5)
Si gnificant im pr o vem ent in e xposur e a ccu racy and picture sharpness, under virtual ly every conceivab le
picture-taking condition, has been achieved in the Joshua. The Camera uses entirely new methods of
measuring and control ling the ambient and strobe contributions to exposure, and optimizing the shutter
aperture at which the exposure is made. Advances in integrated circuit technology permit measuring and
combining, in microseconds, the IR and visible ambient photometer readings. Ambient brightness is also
measured prior to exposure.
To predict the optimum aperture at which to fire the strobe, and secondarily to determine whether the
subject is near or far from the Cam era, Joshua employs a strobe wink system. This involves firing
approximately one-tenth of the strobe energy prior to exposure and measuring its reflected IR value.
Using these ambient (visible) and IR measurements, a micro- processor then selects th e optimum strobe fire
aperture and total exposure value from a lookup table. This table contains stored values for the best
aperture, percent strobe and percent ambient to use, for thousands of photo situations.
In a ddition, a highly-developed encoder system prov ides precise shutter bl ade position information,
allowing the strobe to be fired at the correct aperture. T h is system is not dependent on bl a de speed, as in
the past; consequently, the Camera n e eds no proJoshua for adjusting shutt er blade speed.
Figure 1-5. Microprocessor Control of Exposure
1 - 7
Key Joshua System Features (Figure 1-6)
• Automat ic focus, automatic exposure, automati c flash with rapid recharge (less than 5.3 seconds
bet we en sh o ts ) , a utomatic fi lm ad v anc e.
• High-quality multi-element optics: Three-element, 107mm lens (front element is coated glass).
Aperture range f/12 to f/72. Use of accessory close-up lens adds another lens element.
• Picture storage compartment with viewing window.
• SLR viewfinder presents bright image identical to image which will appear on photo (you get
exactly what you see).
• Use of small apertures and two focus zones provides close-distance sharpness.
• Flash Range 0.6 - 3m (2 - 10 ft.). SPAR (Strobe Preferred Automatic Recharge) strobe charging,
energ y- s avi ng hyb rid que nch s y ste m.
• Picture counter counts down (sh ows exposures remaining).
• Brightn ess Override switch adjusts exposure +3/4 s top ; auto matically re sets when camera is fo lded.
• Built-in Self-Timer: blinking LED and beep with increasing rapidity during 12-sec. countdown
interval.
• Steady red LED signals flash charging or filmpack battery is low.
• Flash ing red LED signals empty f ilmpack, sto rage compartment full or pi cture sto pped.
• Audible signals for empty film pack, picture storage compartment full, picture stopped, self-ti m er.
• Integral sn ap- on mount wit h a ccesso ry close-up lens.
• Lens pro tected by to p c over when cam era is closed.
• Camera automati c ally adjusts for manufacturing variations in film pack speed.
• Attac hed neck st rap wi th measur ement lin k.
• Tripod mount.
• Weighs 760 grams (27 oz.) with full filmpack.
• Film speed ISO 600/29.
• Film frame size: 11.1 x 6.4 cm (4.4 x 2.5 inches).
Picture area: 7.3 x 5.5 cm (2.9 x 2.15 inches).
1 - 8
Figure 1-6. Joshua System Features
1 - 9
Using the Camera
Note: See the Operator’s Instruction booklet for more information.
Loading Film
Use only Polaroid Joshua instant film. Film may be loaded (Figure 1-7) with Camera erected or collapsed:
Camera is easier to handle when collapsed. Open film door by sliding the door latch; lift the door up and
slide film pack in. When door is closed and latched, you will hear the film cover (darkslide) transported into
the picture storage compartment and see it in the window; counter will advance to 10.
Fi gur e 1 -7. Loadi n g the Fi lm
Erecting C am e ra
Hold Camera with left hand grasping rubber grip (Figure 1-8). Press button on top of Strobe tower with
right thumb and raise the flash until the Camera clicks into its open position. (The erect linkage on lef t side
of bellows will be firmly l ocked in position and Viewfinder image will not be blocked). Red LED on rear
of strobe will light indicating strobe is charging, followed by green strobe-ready LED. (Strobe shuts off
automatically a f ter 30 seconds to save energy, but will turn on as soon as your finger lightly touches the
sh utter but ton.)
Figure 1-8. Erecting the Camera
1 - 10
Taking Picture
Hold Camera horizontally or vertically (keep flash on top), frame your picture and press shutter button
(Figure 1-9). (If Viewfinder is black, Ca mera is not fully erected — push flash tower forward until it
clicks.) If green LED is not lighted, touch shutter button l ightly to charge flash. The picture adva n ces
autom atical ly int o the st orage compar tme nt, ov er the p revious p ict ure s.
Figure 1-9. Fram ing and Formatting the Picture
Pictures can be removed immedi ately, by opening the picture removal door, or left in the storage
compartment (Figure 1-10). When the compartment contains 10 pictures plus the dark slide, the camera
beeps and operation is inhibited until the pictures are removed.
Figure 1-10. Viewing and Removing Pictures
1 - 11
Brightness Adjustment and Self-Timer
To reshoot a picture that is too dark, move the Brightness Override Switch toward the white-dot arrow
(Figure 1-11). To take a darker picture, move the Switch to the left, toward the black-dot arrow. (Camera
must be erected; Switch will reset to normal when Camera is collapsed.)
To operate Self-Ti mer, set Camera on tripod, frame picture and slide switch toward clock symbol (it will
spring back). Camera will beep and red LED will flash at increasing rate during the next 12 seconds, then
strob e w ill fi re. May be cancelled by pu shi ng swi tch t o r igh t again, or collapsin g C amera, or li ghtly tou ching
the shutter button.
Figure 1-11. Bri g htness (Lighten/Darke n) and Self-Timer Controls
1 - 12
Major Functional Subsystems of the Joshua Camera
Note: The following descriptions and illustrations are
intended to famil iar ize y o u with what th e C ame ra
subsystems are. How these subsystems work is
covered in the Theory of Operation section.
Erecting, Viewfinder and Camera Optical System
Figure 1-12 shows in simplified form the linkage which erects the Camera and accurately positions the
optical elements for viewing the scene and exposing the picture. When the release button latch on the top of
the strobe tower is depressed, a latch at the base of the strobe unlatches the top cover. Further rotation of
the strobe tower swings the shut t er assemb ly up to a vertic a l position, where the erecting linkage latches all
pivoted assemblies in place and in proper optical alignment.
Figure 1-12. Erecting Sequence of the Joshua Camera
1 - 13
The image path through the single-lens reflex viewfinder, from the scene to the camera user’s eye, is shown
in Figure 1-13. From the taking lens, the im a ge is directed onto a fixed viewing mirror at 45 degrees . . .
then to a textured fresnel focusing screen . . . back to the viewing mirror . . . and then to a concave
mirror, which directs the image of the object through an eyelens to the user’s eye. The visual framing field
equal s the ph otog rap hic field at all di sta nce s.
Figur e 1-13 . Image Pat h through Sin gle -Lens Ref lex Viewf ind er
1 - 14
As shown in Figure 1-14, a second mirror — the taking mirror — is mounted on the underside of the fresnel
screen. When the shutter button is fully depressed, the pivoted fresnel screen/taking mirror assembly is
unlatched and driven upward into the optical path to the 45-degree angle position shown. A fraction of a
second earlie r, a blind was moved into place within the viewfinder window to prevent stray light from
reach ing t he fil m.
If the subject is 2.7 m (9 ft.) or more from the Camera (determined automatically from strobe wink
reflectance data), an internal far focus lens is automatically rotated into the optical path, for proper focusing.
Film exposure o c curs as the shutter blades are opened and closed. Then the taking mirror is driven back
down to its original position and the viewfinder blind is opened.
Figure 1-14. Movement of Taking Mirror into Optical Path during Exposure
1 - 15
Drive and Switching Systems
Yo u w ill n o te similarit ies between some o f the components of the J o s hua driv e s y s tem s h o wn in Fi g ur e s 115 and 1-16, and comparable parts of Spectra/Image, 640, Impulse and SX-70 drives — for example,
motor-drive n reducti on gea r trai n, sin gle-re voluti on tim ing ge ar with camm ed sur faces, co unter wheel, pick
as sem bly an d w irefo rm s wit che s.
However, many Joshua drive system parts are new and unique. These include:
• Recock Link, one-way wrap-spring Clut ch Gear and Re c ock Latch system for positioning and
returning the Taking Mirror.
• Viewfinder Blind system which prev ents stray light from striking the film during exposure.
• Motor operation in both forward and reverse directions.
• Film frame transport via two pick systems and two sets of rollers. One pick pulls the frame into the
feed rolls which drive it through the “chute”, and a second pick moves the frame into the storage
chamber as it exi ts the s p rea d s ystem rol ler s .
• Separate wireform switchblocks for logic functions and powering the camera:
- A 5-wire “Logic” switch (Figure 1-15) on the gear train side of the drive assembly controls
Electronic Trim, Chamber Full, Self-Timer, End of Pack, Darkslide/ End of Cycle, Shutter
Release and Film Speed functions.
- A separate 3-wire “Erect” (Power) switch (Figure 1-20) l o cated on the opposite side of the
mainframe controls B+, VER and GND lines, and opera tes in conjunction with the Door Latch
Sensor, Erect Sensor, Power Actuator and Film Shade.
Logic Switch (See Switch Block Assembly in Figure 1-16) Power On at Start of Processing (Camera Erect)
Figur e 1 -15 . Log ic Swi tch and Power O n s wit ch
1 - 16
Figure 1-16. Principal Parts of the Joshua Drive System
1 - 17
Shutter System (Figures 1-17, 1-18 and 1-19)
Key components of the Joshua shutter system, shown in Figure 1-17, include the Front Lens, Far Focus
Len s an d it s S olenoid 2, Walk ing Beam, I n ert ia S y s tem , the two Blade s a nd their Solenoid 1 a nd Ambient/
IR Lens. The Blade Position En coder system (Figure 1-18) i n cludes the band of vertical slots n e ar the
bottom o f t he Blades , a ph oto diode and ph oto-tr ans ist or (Figure 1 -18 ) o n t he PC board, an d c ircuits in t he
Exposure IC. Because the Joshua is a single-lens reflex (SLR) camera in which the image is viewed through
the t aking len s, the shutt er mus t n ormally b e open for s ubject viewi ng. The Blade Ope nin g Spri ng attach ed to
the W alk ing Beam hol ds the Blade s i n this no rma lly- open po sit ion , unti l they ar e clo sed pri or to exp osu re by
ro tation of th e Walk ing Beam, when Sole noi d 1 is ener gize d.
Figure 1-17. Key Components of the Joshua Shutter System
1 - 18
Fi gur e 1-18. J o s hua Bl ade P o s iti on Enc oder Sys t em
Ambient Visible and IR levels are measured by a dual- photocell Photometer on the PC board, through
green and black lenses on the lens mounting plate and corresponding apertures in the shutter blades. Each of
the se expos ure components — ambient an d IR — is in dividual l y int egrated ( ele ctronical ly s um med) by i t s
own integrator.
The Two-Zone Focus System uses, under microprocessor control, the main three-element Taking L ens
only, for ne ar zone (0.6 to 2.7 m or 2 to 9 ft.) exposures — or the main Lens plus the automaticallypositioned Far Focus Lens for exposures between 2.7 m (9 ft.) and infinity (Figure 1-19).
1 - 19
The microprocessor determines which zone to use, based on IR reflectance data resulting from the strobe
wink. (Although the electronics uses the wink mode to d etermine whether the subject is near or far from
the camera, the primary purpose of the wink mode is to predict the strobe fire aperture.)
When th e Far Focus Lens is needed, it is pivoted into the opti cal path by Solenoid 2 and latched by the Lens
Latch and Latch Actuator (Figure 1-19).
Figure 1-19. Two-Zone Focus System Components
As exposure begins, the two blades are opened r e latively slowly (about 40 ms from closed to fully open), t o
maximize the amount of ambient light used in the exposure, and the time the blades are at smaller apertures,
to enhance depth of field. The rack and pinion (inertia link and inertia gear, respectively) of t h e inertia
system act as an effective mult iplier of inertial forces, to allow the blades to begin opening slowly. (The
blades are coupled to the Inertia Link and Gear through the Walking Beam and Inertia Spring.)
Blade position is very accurately monitored and controlled by the Blad e Encoder system. The photodiode
encoder pair (on the PC board) and horizontal rows of nine slits in the blades together act as a pulse
generat or, as the slits successiv e ly overlap during blade opening. Because of the accuracy of the Encoder in
supplying blade position/aperture information, no proJoshua for blade speed adjustment is needed in the
Joshua shutter.
The strobe is fired at an aperture selected by the microprocessor from a lookup table, and quenched 2.5 ms
later or when the IR integrator reaches the strobe contribution value selected by the microprocessor.
1 - 20
Exposure ends and the blades are closed when the sum of the visible and IR integrator values equals the
selected total. (If this selected total has not been reached when the strobe is quenched, the blades stay open
and the ambient integrator is turned back on (enabled) until additional ambient completes the exposure or a
40 ms Timeout is reached.
To end the exposure and close the bl ades as rapidly as possible, Solenoid 1 is energized and the Inertia is
left behind. A weak Inertia Coupling Spring then resets the inertia to its original position, after the shutter
has c lose d.
N ot e: F o r a si mpl ifi ed pic torial pr es e nta tion of th es e steps ,
see the Exposure section of the Polaroid Joshua
Sequence of Operations chart at the beginning of the
Theory o f Operatio n section . (Se e P age 2- 4)
Film Frame Transport and Spreading (Figures 1-20 and 1-21)
When exposure of a film frame has been completed, the drive motor starts in the forward direction, turning
the Timing Gear. Th is causes: the Darkslide/End of Cycle switch (DKEC) to close; the picture Counter
Wheel to index one count; and the exposed frame to be pulled into a set of two Feed Rolls by a Pick
Assembly.
These rolls have rubber tires (O rings) which contact the fram e along its edges, drive it through the chute
and into the Spread System Rolls (Figure 1-20). Just before the fram e enters the Spread Rolls, it passes
over opposing, slightly projecting molded surfaces on the bottom of the Film Box and part of the Spread
Ro ll A ss embly (Fi gur e 1 -21 ). Thes e mold ed fe atu res help po sit ion the r eag ent mo re evenl y in th e p icture ar ea
bef or e actu al sp read ing oc curs .
At the same time the fra me enters the Feed Rolls, a mechani cal Film Shade (similar in function to the frog’s
tongue in other Polaroid cameras) is automatically positioned over the first 1.9 cm (.75") of the picture
Viewing Window. The Film Shade prevents light-piping fogging of undeveloped film through its
tra ns parent myl ar coa tin g.
The frame now enters the Spread Rolls which break open the reagent pod and spread the reagent. A second
chamber P ick (S ee Figure 2- 27 on Pag e 2 -21 ) i n the Doo r catche s t he end of th e proc ess ed frame fro m the
matin g poi nt ( nip ) of t he Sp rea d Roll s. This is to en sure th at the pr oces se d fram e is p ulled cl ear of the S pread
Ro lls and i s po sitiv ely carr ied int o the pi ctu re S tor age C ham ber , w here i t w ill no t int erf ere w ith the ne xt frame
to be spread.
The film Chute, Chamber and associated transport mechanisms are designed to permit trouble-free insertion
of additional film frames, either from the Chute or through the storage chamber Door, until 10 frames and a
darkslide are in the storage chamber. At that point, a Full-Chamber Switch is closed, inhibiting further
pictu re taki ng.
1 - 21
Figure 1-20. Film Frame Transport, Spreading and Storage
Figure 1-21. Features for Even Reagent Distribution in Pod
1 - 22
Specification Summary — Joshua Camera
Camera Type Folding, single-lens reflex with integral strobe and picture storage/viewing in
camera.
Film Type Polaroid Joshua instant color print film; 10 exposures per pack with integral
mercu ry- free bat tery.
Frame Si ze 11.1 x 6.4 cm (4-3/8" x 2-1/2").
Image Size 7.3 x 5.5 cm (2-7/8" x 2-1/8").
Focusing System Automatic, two-zone:
• 0.6 m - 2.7 m (2 - 9 ft.).
• 2.7 m - infinity (9 ft. -infinity).
Acces sor y c los e-up lens pe rmits f ixed f ocu s a t 0 .3 m ( 1.0 ft ).
Strobe Range 0.6 m - 3.0 m (2 ft. - 10 ft.).
Strobe Operation SPAR system, hybrid quench, typical recharge time less than 5.3 sec.
Exposure System Strobe-always, fill flash, W ink Aperture Priority (flash fire aperture based on
IR r eflectance and value s e lected from lookup table by microprocessor).
Ov era ll Dimen sio ns • Folded: 57 x 96 x 180 mm (2.25 x 3.79 x 7.1").
• Erected: 114high x 109 deep x 180 wide (mm) (4.48high x 4.29 deep x
7.1" wide ).
Weights • 634 g (22 oz) empty.
• 758 g (27 oz) with film pack.
In dica tors • Empty Film Pack - Red LED flashes eight times,
four beeps sound.
• Strobe Charging or Battery Low - Steady red LED.
• Str obe Rea dy - Stead y green LED .
• Chamber Full or Picture Jam - Red LED flashes eight times,
two-tone beep sounds four
times.
• Self-Timer On - Front red LED flashes
Controls Sh utt er but ton , c ame ra erect, b r igh tne ss adj ust men t, sel f-timer .
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Components, Covers and Panels
Figure 1-22 on the following foldout page is an exploded view showing principally the removable parts,
panels and covers of the Joshua Camera.
Please note that this illustration is for general informa tion only and NOT i ntended as a disassembly guide or
representation of major sub-assemblies of the camera. (That infor m ation is presented in other sections of
this Ser vice Manual.)
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