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Canon A-1, Repair Manual

The Canon A-1, a highly regarded SLR camera from the 1980s, comes with an exceptional Instruction Manual. This comprehensive manual is a valuable resource for photography enthusiasts, providing detailed insights into the camera's features and functions. Download this user manual for free from manualshive.com, and master the art of photography with the Canon A-1.

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Summary of Contents for A-1

Page 1: ...Canon A l Repair Guide ...

Page 2: ...c exposure SLR in the world The major goals which guided the design of the A l were Incorporation of advanced digital technology Compact easy to handle body Compatability with AE l system components Interchangeability of parts with AE l Improved durability 2 Features 2 1 Five difference automatic exposure modes o Full Aperture TTL Metering Shutter speed priority AE Aperture priority AE Programmed ...

Page 3: ...in whichever mode it is in Details are given later 2 4 Expanded Range and Versitility Expanded metering film speed and shutter speed and ex posure compensation ranges EV memory and multiple exposure increase the A l s versitility 2 5 Essential Controls and Displays Grouped for Easy Reach and Rapid Operations 1 AE mode 2 AT dial 3 Shutter button lock self timer lever 4 Viewfinder information displa...

Page 4: ...e Field of view Magnification Viewfinder Power Focusing Screens Fixed eye level pentaprism 93 4 vertical and 95 3 horizontal 0 S3X at infinity with 50 rom lens 1 0 dpt same as the AE l Standard screen is center split image 2 5 rom di ameter with So prism angle rangefinder surrounded by microprism with So prism and ground glass fresnel field for the remaining portion The six focusing screens for re...

Page 5: ...D lens at the A mark and selecting the AE mode with the AT dial to relay the input of exposure control information Three LSI with 12L one linear LSI and one Bi Hos IC the latter for metering the light are used 2 Automatic exposure modes AE Hode Metering Shutter speed Full aperture priority Aperture stop Full aperture pri ority Prograaaed Full aperture AE flash Full aperture Stopped down Stopped do...

Page 6: ...er reading the same as the AE l by a silicon photocell placed above the eyepiece and fresnel lens to concentrate the incoming light 4 Meter Coupling Range EV 2 f l 4 lens to EV 18 with ASA 100 film The programmed AE program is shown by the dotted line 5 ...

Page 7: ...30 15 8 4 2 AE coupling Range for ASA Film Speeds with f l 4 Lens F NO la II 5 6 4 2 8 2 1 4 112 114 1 8 III 1130 1160 VI25 11250 II IOO 1 1000 m ...

Page 8: ...ck button located where the exposure compensation button is ON the AE l While this button is pressed the exposure reading is locked and you are at your liberty to vary the com bination of shutter speed and f stop 8 Stopped Down Metering Lever The lever is of folding type and by lifting the end and pushing against the t ension of the spring it is locked in place 9 Other Operations The AT dial has t...

Page 9: ...cy the weaker the battery 5 Cancellation of the circuit 1 Set the shutter button lock lever to L or 2 Press the battery check button and take your finger off the button The AE l s circuit is cancelled the moment the battery check button is pressed while the A l s circuit is cancelled the moment the finger is taken off the button To be more precise the A l s circuit is cancelled when the battery ch...

Page 10: ...he top of the pentaprism has a direct flash contact On the front of the camera body is a PC flash terminal JIS B type With built in electric shock preventive rim o The accessory shoe has an automatic flash control contacts for automatically switching shutter speed and aperture o When using ordinary flash units other than Speedlite 155A and 199A set the AE mode selector to Tv and set the shutter sp...

Page 11: ...elf timer is in operation When the self timer lever ia set to 10 the flashing frequency is 2 Hz until two aeconds befor e shutter release and increases to 8 Hz after that time When the self timer lever i aet to 2 the LED flashes at 8 Hz frequency This flashing helps the user to know approximately when the ahutter will be released 5 Self timer operation with the shutter button at B If the self time...

Page 12: ... o When the shutter is open the film cannot be advanced o The film can be wound with the shutter button held in the depressed position These are the same with the AE l 4 Frame counter Additive type Automatically resets when the back cover is opened While rewinding film it counts backword The frame counter does not advance during multiple exposures 5 2 4 18 20 22 34 36 38 0 20 and 36 are orange oth...

Page 13: ...o reset the mechanism when the error mark EEEE EE is displayed in the viewfinder The camera will not f unction even if the shutter button is pressed until the multiple exposure lever is pressed 3 Other points in multiple exposures 1 Multiple exposures cannot be performed when the Motor Dr ive MA or Power Winder A is in use on the A l 2 Once the multiple exposure lever is set the camera will not fu...

Page 14: ...5 D mm rJ D I I 141 144 including hinges 3 13 Related Accessories 1 Standard Accessory shoe cover Silver oxide battery Body cap R F Eyecup 4S 620g body only including a battery Neckstrap with a shoulder pad Adapter for tripod Action grip Semi Hard Case S or L 2 Main system accessories FD lenses Motor Drive MA new Power Winder A Speedlite 199A new Speedl1te 155A Data Back A 13 ...

Page 15: ...tter button is pressed the exposure information appears in neat digital form of red seven segment LEDs below the field of view if you wish to view it 1 Viewfinder Optical Design A special optical plastic is used to make the prism which reflects the image of the LED s thru the penta prism into the eyepiece The LED s are located below the prism well away from the SPC so they do not affect its readin...

Page 16: ...ightly sealed against the ingress of dust 4 2 Viewfi nder Information character display viewfinder The viewfinder information bf the A l includes the AE mode selected pre programmed and compated exposure values warn ings of incorrect exposures and improper settings for AE photography These pieces of viewfinder information play a vital role in taking pictures This viewfinder is one of the main feat...

Page 17: ...Aperture f l 2 to f 32 in 1 2 step increments two digit display c The F letter display lights up when the f l ash unit 155A or 199A is used and ready d The MOO letter lights to warn when the camera is not set for AE operation e When the tension of the aperture signal coupl ing lever of the camera is cancelled the error mark lights up six LEDs light up as EEEE EE If after stopping down the lens by ...

Page 18: ...step increments However it would be trouble some to have these values display in the viewfinder as they would change so quickly depending on light ing conditions Because it would be hardly possible to see a continuously changing shutter speed and aperture readout which are unfamiliar to users we have done much testings about viewfinder infor mation After considering the physiological characteristi...

Page 19: ...18 Tv Indication 180 10 250 350 SOD 00 150 250 500 5 6 a Av Indication 1 5 10 56 10 6 1 80 10 9 S Fig 3 Display Indication in 1 2 Step Incrementa ...

Page 20: ... 0 5 0 4 5 3 0 2 0 I 5 I 0 B 5 4 3 2 o 7 I I 5 2 I 3 I 4 I 5 I 8 I I 0 I 5 I 2 a 30 b u L b F b u F E E E E 3 2 2 IJ 2 2 I 9 I 5 I 3 I I 9 5 8 0 5 7 5 5 4 5 4 0 3 5 2 8 2 5 2 0 I 8 I 4 I 2 E E M 4 Numerals and Characters to be Displayed 19 ...

Page 21: ... lighting conditions But since the signal is transmitted to the display at every 0 6 sec the data is displayed after a time lag of 0 5 sec e I 4 1 z I I I Zr c I r c B D 8 D 5 1 3 5 25 2D i D Fig 5 Change in the Brightness of the Subject and Display o Flashing is at 2 Hz ...

Page 22: ...e flash 301t or 1000 If brightness is too low less than EV 2 ASA 100 both shutter speed and aperture flash AV 16 19 22 27 32 TV 1000 1High Jbrightness TV AV One step 10werlLOW than X brLghtness AVO Both values flash together A shutter speed which falls outside the meter coupling range below EV 2 ASAlOO FD lens AVO or 19 22 27 32 Other 5 6 pr 19 22 21 32 TVS appears when a slow shutter speed is use...

Page 23: ...conditions 3 Point to remember For shutter priority AE mode there is a click stop for each shut ter speed on the dial If a shutter speed i s se t t o an int ermediate position between two adjacent s hutt e r speeds either of the two click stop ping shutter s peeds is indicated and the shutter is actually relea sed at that indicated shutter speed Example If a shutter speed i s set to an intermediat...

Page 24: ...stop Both the scales of the f ilm speed setting dial and those of the exposure compensation dial are calibrated for every 1 3 step increment while the display is calibrated in 1 2 step increments If either dial is changed by 1 3 step it occurs that the display re mains the same or is changed by half a step Actual exposure is correct since actual exposure control is in 1 8 increments M appears in t...

Page 25: ...AE and aperture priority AE mode while in the programmed AE mode both shutter speed and aperture value are both variable so the changeovers do not occure at exactly the same point There is no difference in the actual exposure If AE photography mode is changed from one to another while metering the same subject flashing warning may take place in the AE mode changed to Example If an exact calculated...

Page 26: ...8 1 8 1 1000 1 8 16 1000 16 18 2 8 1 1000 1 8 16 1 8 aooo 16 n H 18 3 8 1 1000 2 8 16 1 8 1000 16 IV I I I 18 4 8 1 1000 2 8 16 2 8 1000 16 1 Accordingly notice that when you are in programmed AE mode the viewfinder display flashing means that the camera is outside the exposure coupling range of EV 18 While the self timer is in operation or the shutter is open the display goes out When an FD lens ...

Page 27: ... as that for AE photography With the Speedlite 199A if the shutter button is held in the depressed position the F indication will not be displayed at flash charge completion be cause the camera ignores that signal and remains in AE mode rather than switching to Flash AE Among the lenses which were manufactured before January 1977 there are lenses with maximum apertures of f l 8 f 2 f 2 5 f 3 5 and...

Page 28: ...he viewfinder dis play may indicate f 3 5 when the aperture is preset to f 2 8 old lens c When you are in programmed AE mode at maximum aperture AVO t he aperture is fixed and the shutter speed becomes variable But in this case the aperture value shifts a little bit also Combination use with the Motor Drive MA With the high mode setting the viewfinder display is not visable With the low mode setti...

Page 29: ...ti ons for the operational sequence and performs the function of procedure and control of the exposure mode selector such as shutter speed priority AE aperture priority AE and programmed AE The existence of the program unit with the program mable logic array makes possible the input of infor mation in the fashion of a single lever and dial move ment The capability of this data loading program is e...

Page 30: ...UNCTIONAL BLOC DIACRAM nnnl au T SPUD UD 11Il10 tsV VT A IO om I l CPU IC t o aus AUTIN TIC UIIIT elK ALU 1 1 f r saY StQUL ICI SOIC I LOGIC f SIoIG J IfTI s f SAV P tt I A CO Y1EW IICDU D1SPU f LED TUQ U I LED I I osm 1 O COOE OliVER IC CLK OSC IJrfI U IQ IC l 1 S SIW U f l l PI ILSt C11CVIT I LED Ol iVER g MGI u MGZ _ MO l SELF Jt I 1G 2 1 1 1 ...

Page 31: ...AL UA CALINA 00 AT DlAL COD F1g 2 8LOCK GRAH Ot ltI UTf R INTEGRATED tNTO lTROL SYSTEM AI ItOOE SElZCTOl DI n u CALClJUTOI 1tOT0I DllV HA OR POWtk ll lrotl A BBBB DECOI P DliVU DUnAT wn ACtIVAYlC 0 CAHtU on ATIc A UTCMAYlC Uf OStIlt utD lIST CURTAI TlAVEL SECOKD CURTAIM TlAVEL ...

Page 32: ... of information that can be displayed and information that can be read with far greater accuracy Reduction in the total number of parts and component parts requiring adjustments Quite a few parts can be put into the form of monolithic IC chip and this means lesser need to as additional process solder parts such as resistors and capacitors Credibility in performance and cost reduction are thus real...

Page 33: ...2L and including the CPU As this LSI is composed of digital circuits only greater circuit density is achieved As in ula tion between analog and digital circuits is not neces sary density can be increased proportionally In the LSI built in 12L of the A l an a bit micro computer is Fig a shows the construction of the pure OSC INTERFACE This is a bi polar Ie consisting of oscillator and interface cir...

Page 34: ...E B GND Ep B CI n n Analog circuit Digital circuit isolated I L B CI Cz Fig 8 pure II L E Ep Emitter B Base C Cl C2 Collector GND Ground Earth Comparison between the Isolated I 2L and Pure I2L 35 ...

Page 35: ...cuit to enable better signal response are assimilated into the IC and the SPC and IC are sealed into a single package immune to humidity and thermal changes The SPC is positioned above the eyepiece as in the case of the AS I The employment of a fresnel lens to concentrate the light means mounting the A l with different lenses affects consistency in center weighted average meter reading very little...

Page 36: ...he switch 51 When the switch 52 starting at the time TO tl is turned off Ex is introduced into the integration circuit which consists of the registor RII the capaCitor C and the amplifier A and is integrated for a fixed time TIll The output voltage EO at this time can be obtained as follows E f2 Exd t CRt T Ex CR The timer generates the voltage which is proportionate to the input voltage Ex and th...

Page 37: ... in exact proportion to the metered amount of light After going through this cycle the switch 51 again returns to a turning on the switches 52 on both sides of the condenser in order to reset the cycle and start metering the voltage This system has the following advantages A There is no need to take into account variations in capacitors and registors The amount once stored into the capacitor is di...

Page 38: ...ormation switch has an int erval of 0 15 mm between conductors and a conductor width of 0 15 Mm This is the limit of present technology Erroneous information must not be input when the wire brush moves somewhere between click stops Otherwise the preciSion of the camera will be jeopardized The A I employs a Gray code or a cyclic binary code instead of a natural binary code Let us mention the differ...

Page 39: ...adjoining code is only one and therefore even when the wire brush moves on the boundary of code only either one of code will be inputted the effective one will appear in the viewfinder display Please notice that signals inputted by the Gray code will be decoded into the natural binary code in the CPU circuit Therefore the Gray code assure error proof function Natural Binary Code Gray Code 0 000 00...

Page 40: ...e are introducing The 8 bits enable you to make Notice that these data are means of natural binary code ASA 100 ASA 400 Shutter Shutter Aperture Aperture EV value EV value speed speed f 4 f 5 6 EV 10 EV 11 1 250 1 500 MSD LSD 00100000 00110000 10001000 10010000 00101000 00110000 10100000 10101000 Code tables in the Repair Guide are written with the least significant digit LSD at the left for ease ...

Page 41: ...he figure 13 a describes the static display method b shows the principles of the dynamic display method and c shows the timing chart In the static display method the counter output is input into the decoder driver by means of four lines After being decoded for a seven segment LED display signals are transmitted into the seven segment LED display by means of seven lines This means that the static d...

Page 42: ...ity is very good due to the higher power of illumination The flashing power and cycle were determined after making many lots of monitoring experiments In this fashion the wire of the display will do with the number of digits multiplied by seven and with only one decoder driver This contributes to the cost effective reliability and power saving while taking into consideration the characteristics of...

Page 43: ...eDent information a circuit which decodes the BCD code into seven segments and makes the LED flash is required This is the main role of the decoder driver and the relation between the BCD code and seven segments is shown in the chart to facilitate your understanding ...

Page 44: ...r Driver Decoder Driver c 8 c 0 u c 0 u r I Clock pulse r I I I I I I I I n 0 0 LI 0 U 1 1 I _ _ _ L____ ___ _____________ _ a Static lighting system r f 0 8 II I i 5 D 1 u 0 I I ioO lll i A f U 4 1 t T Ir T I Clock Pulse L___ ________________J b Dynamic lighting system c Timing chart 45 ...

Page 45: ...3 0100 01 1001 I Y 0101 I a I I a I I S o I I 0 I a I I I I I 5 o I I I I I I a a I a r J 1000 I I I r I I I B 1001 I I I I 0 I I g 1010 001 I I I I b I o I I 001 I 100 u I 100 0001 I 10 I L I I 0 I 10001 I I F Seven Segmented Code Codes have been rewritten here for easier understanding in this chart and they do not correspond to the codes actually used in the A i ...

Page 46: ... are 1 1000 30 sec 32 sec Self timer 2 and 10 seconds The LED flashes on and off in 2 Hz for the first 8 seconds and in 8 Hz for the last 2 seconds prior to the shutter release Viewfinder Displays Flashing LED for warnings 2 Hz Entry of new information at every 0 5 second Controlled time during which the electric current is applied to various magQets Anticipated time within which the mirror comple...

Page 47: ...e A l As explained above the A l enables the photographer to use it in many ways owing t o the built in PLA which 1s capable of detecting which AE photography mode has been chosen and controlling the camera operation by means of the program designated Figure 10 tering th the na Fully en 9 Bus Line System The A I has employed the bus line system for its data transmission To put it simply the bus li...

Page 48: ...I BBV Eight lines are necessary to get eight bit signals transmitted at the same time to the micro computer for computation In other words each bit of the eight bits is ranked in the order of I BBV 1 4BV 1 2BV IBV 2BV 4BV BBV and 16BV Taking the case of the signal 01001100 for example the resulting digital information of the subject bright ness becomes 6 25BV 1 4 2 4 6 25BV This information is inp...

Page 49: ...g 16 Word 1 carries signals of various input digital information and Word 2 carries brightness value BV digital i n formation which has been converted from analog inf ormation Word 1 is being transmitted most of the time but the Wor d 2 is sent in turn immediately after the interruption by t he signal of ADCE AD ConverteI End takes place at the end of transmission of the Word 1 every 20 millisecon...

Page 50: ...ter speed for the 199A CD Manual 0 Model 1 G Mode 2 0 Start of the display Checking of the voltage Analog to digital converted data In thisway it is possible to transmit many signals through one signal line Fig 16 Bus Line 10 Battery Check 1 Automatic Check The A l has built in safety mechanism in which automatic battery check function prevents the camera from working mistakenly when the battery h...

Page 51: ...d to the MG1 MG2 and a registor of some load and the degree of the remaining power is known according to the way the LED blinks on and off Though the flashi ng cycle of the LED varies ac cordi ng to the voltage for example in the case of the voltage proportion of 6V to 3V the LED flashes in the proportion of 4 to 1 times if the LED flashes two or three times without much time lag the battery is co...

Page 52: ...ible board is of multilayer construction with patterns on both sides What s more the minimum distance between lines and the minimum line width are 0 2 mm This is a figure close to the limit obtainable by present techniques 2 Circuit Board Layout and interconnection Figure 18 shows the block diagram of the circuit boards and figure 19 shows a pictorial view On the top deck are positioned the main f...

Page 53: ...is a two sided flush plate to be explained later These flexible boards and various other boards are connected by rubber connectors and soldering ...

Page 54: ...lexible Plate E CPU INPtrr CSC Light F t Measurement i i II i II II UlL 1111 Decoder Driver AVO Flexibl Flexible Plate Plate 11111111 III 111111 III E E SAVE Display Flush flat on both sides Decoder E E plate Driver E t Unit 1 1 Fig 18 Block Diagram of Circuit Boards Connection by using connector Connection by soldering ...

Page 55: ...56 _ Main Flexible Circuit Board SV Base AT Flexible Board AT Base Circuit Board Driver Flexible Board AVo Flexible Circuit Board Flush Pattern Circuit Boards Fig 19 Layout of Circuit Boards ...

Page 56: ...he one used in A l and is simplified for the purpose of explanation Digital switches Sl and S2 in Figure 20 are connected in parallel In the figure the condition of Sl is 010 and S2 is 110 When signals are taken out in time series the outputs for 51 and S2 are 010 and 110 respectively NOW if we think of the Tl signal then Sl and S2 should become 0 and 1 respectively In this case the signals are tr...

Page 57: ... t SWI r b l p a b c a c SW 2 p 0 010 110 a Prevention of reverse flow with the us e of diodes R s T b SW 2 c a c J 0 110 110 b Signal from Tl flows reverse to Sl as shown by the arrows and overlaps with the signal from T2 Reverse flow of signals ...

Page 58: ...trode plate pattern is formed on a 23 m microns copper foil plated TETORON reinforced epoxy board This board is then heated and pressed Thus we succeeded in bri nging the degree of smoothness of the board to within 5 m microns With the incorporation of this new technique macro chattering no longer aris es and micro level chattering is eliminated y newly designed circuitry This smoothing process is...

Page 59: ...60 Top View Precious Metal Wire Brush Embeded Front View Fig 21 Segmented Aperture Value Electrode Plate ...

Page 60: ...le The following points are connected by mini connectors Wiring 12 conductors connecting the display decoder driver flex to the main flexible circuit board Wiring 5 conductors connecting the lens maximum aperture correction information input switch to the main body The wiring from the AV TV and self timer information input switches 10 lines on the right side of the top deck 1s connected to the mai...

Page 61: ...62 Rubber Piece for pressure appl1ca 1on Circuit Fig 22 Mini COnnector Connector Plate Compressed High 0 9SH Rubber Positioning Pin Insulated Copper Layer Fig 23 Mini Connector cross section ...

Page 62: ...re designed to withstand harder conditions such as the use of the five frames per second Motor Drive MA 1 New HD Coupler Figure 24 shows the shape of the Me Couplers for the AE l and A l When continuous shooting is performed with a conventional coupler and Motor Drive MA the coupler collides into the winding stopper of t he camera when winding 1s completed As a reaction the couplers on the camera ...

Page 63: ...64 This prevents the MD Coupler from being moved again by the Motor Drive MA Coupler Camera o t Driver Conventional System Camera Driver A I System Fig 24 MD Coupler ...

Page 64: ... second shutter curtain signal releases the wind stopper it prevents accidental winding while the shutter is functioning even during long exposure times 4 The many steel ball bearings used on the top and bottom of the winder shaft increase reliability and durability 3 Multiexposure Mechanism Set HE lever HE shaft turn The compound gears CW CCW are disengaged from each other Winding the winding Spr...

Page 65: ...66 Lever ME Plate ME Shaft Compound Gear Fi g 25 Multip le Exposure Mechanism ...

Page 66: ...clutch is constructed before the sprocket and spool drive gear it is not necessary to fix the spool when multiexposure has been set Contributes to decreasing the number of parts 3 The automatic reset mechanism eliminates worries about forgetting to reset the camera after multiexposure 4 By setting the multiexposure the wind stopper is released Therefore even in AE discharge condition after windup ...

Page 67: ...W Ft OII CII UT L 6 j_ l r o I t 9 2 OFf 011 5115 SC en I he Oi P hf sm 1 I r h i L Kirror un r r StAtr 0 9 Mel orr Af Utun OP NS STARTS 0 7 CAYS 7 58 l c START Ol IKi tror Up t I b po uu ill Pro r L Shutter Cou lllt lQ Prol r 16 He on e tai D lAtch 0 L Zlld c rr 18 t ST _ J 19 5115 Olf Not 1Iound I c osto f f t _ Si 1 ...

Page 68: ...1C It aDd llAS ItIPllt IIU pov r 1 lp c l ar Until lhr AD co p riloll ar tOllplll A OCE all aCtionl arl held fur 3ADCt incorrect cond itionl EEl LV Ire checked leforl lit rd If 01 follo i occun U SWI only cloud dlphy procallilll uaru Mil dhphy lipal II fill i hld 0 1_1 u nal IIU for t ran i nion of TV A Itc d nall tbru tM 0 IUS to tbe Decod r DTiver At oth r ti _ inulldti 11 10 1 fl hinl i on atio...

Page 69: ...IbIS tilt period tbe co putlr d tlrelne lhat thl blt tlry povlr i i frtcllnt the LY I1IMI ta IMraud 1M unt tbl1 l tb I IUS lb i cancel n ctioell and Iwitchl tbl EILI to Y to the Ihultlr cannot be rilla ed 12 5 Ittar tiLl lOll 1 SHe lOla t and SK I ia L Thta condition 1 lt s s cau lna 17 OSC ItrrtlFACl EIU lOll wittbe to 1 Thi 10ck 1 tbe pavlr pply tr cllliitor ON own loclr in eo iIinltioo of SHe H...

Page 70: ...n aoe orr II lock io i canulhd INPUT cru SAVE pul input i ca p red to A r li r AVS Vl lu 9 WheD SAVE pul AVS SHeI 101 K 1S Wh n CYST 10 L thl hutt r d count I tlrt 16 It n hut r pltd count is fini h d SttGl lOll loti u Wh o VS 101 Off L power up cl r Inal 10 H OSC I NTElFACE 10 Who SHeI 101 It CI i tu rMd off 14 CT r t ch rllnl and t 0 62S EI V 62 S of 1 CTST 101 L o cordtr Ddv r 11 WIl n stC3 101...

Page 71: ...IIf o SUS DI SPlAY orr I s I I I l me I I I I I I I I 0a5 fWC 4 I 1 s s S 1 c l Dcpol Cdc w t1on XI CAt Sf I I I I I I _ loS II I XP t _ U lst Cllrtdn STARTn lHSH _ rtlUSH 7nd CUl teln STAAT I ON for I I One t 1 ud u no s ...

Page 72: ... fluh no E I H D l V A Aootur IoIr prolr_d AV eo p td A St p h_ tf 0 ...

Page 73: ...M n S 1011 MIl row CoU ACltoa VOLt I CE ru sa POssnu j SlGIW ON PU DISCHilCE f I r L J V n n L I r g SWl g r n M tlU t UP J I 0 omr llOaS 120 s r u g j i CC IU Jr r h c r c c _cd _ I t DISPU lJ J on 10lIl IOn 10 otS 2 8 0 f 5 6 8 8 t D15I LA OM t r L r Jr a ION ron1011 0 IIOUMD _ on 011 Et VlIIDINCd I ON Oft ON lid IDII I r ll laS C I t k UOH _ ...

Page 74: ...to thoroughly understand the operation and interaction between the IC s to successfully repair the camera Understanding of Internal operation of individual IC s is not necessary 6 4 If the digital inputs for shutter speed aperture ASA maximum aperture self timer etc are not correctly adjust ed there will be a direct affect on the viewfinder informa tion and exposure accuracy Each input has a check...

Page 75: ...Shutter Speed Tester is necessary 2 Flange Focal Distance is adjusted to 42 14 mm using the Glass gage and measuring at the four corners 3 The finder back is adjusted to 42 03 mm using the standard lens 4 Exposure accuracy is adjusted by the SPC output using the Bus Checker tool to check the I Bus It is then confirmed using the EE Camera Tester If exposure accuracy is not wit h i n the proper limi...

Page 76: ... interchangeable Special attention should be paid to parts control to insure that the cor rect parts are used 2 The A l shutte r is controlled in 1 8 step intervals For this reason the 2nd curta in latch adjustment has been changed Rather than having a space between the latch and latch cam they press against each other in this design 3 Because of the digital control the positioning of the informat...

Page 77: ...k pulse SYNC 07 the synchronization trigger I BUS input busline and O BUS output busline 9 In order to understand the A I circuit it is necessary to study the detail operation of each IC as outlined in section 3 o f this repair guide 10 The A I is a s ystem camera It uses the following major accessories POWER WINDER A MOTOR DRIVE MA SPEEDLITES l55A and 199A DATA BACK A and WIRELESS CONTROLLED LC l...

Page 78: ... l AE l A l Completion SW SW5 L H H L SWS H H L L SW511 ME SW5 Disable SW In series with SW5 f this switch prevents me tor drive operation if the multiple exposure lever has been pressed SW6 AE Lock SW Records and holds measured EV when pressed Exposure memory switch SW7 Power Main Switch A L switch SW8 Battery Checker Battery Check 4 5H flashing LED Clears SW Clear SW all circuits in mid operatio...

Page 79: ... u e i rr J___ __JJUSYNCID7 II CCCIt21 181 9 TPII8 0 0 i i d SVNaon 1 BiJS 16 t N N 0 u u e 0 uW L 5iP IIi tSN2117ZOI SUOC2 SMGlI is z S iii g N 8 8 aS 0 is 0 u u f IOiL OlI E LI 71 LI I II OSCIINTERFACE SLEDI8 It SMG I ISt 8722 MG211 BlAS SMG 05C19 ISETIII l 0 I 1 3 1 DISPLAY LEO D D ID GITS D D SE M NTS oD e i 0 z rlill f 0 I E LEO MG OMG2 R G l C47 NG E VOT ...

Page 80: ...ot e 2 Mark Initi l operation _rk par_t era 1 SW2 ON 2 SM S 01 1 W volt age OK no e ro l S Self timer not et elf t iaer 11 et SBLP UO END elf t i r t ime i e aplet eed Not e J 1 2 s delay ia for axpo ure calculat ion and l ov vol tage det ermination NOt e I Hark secondary Operat ion rk par_ter l 1 SAVE SIGNAL pre ent 2 CTST Shut ter count not t arted 3 Len a t A rk Note S T2 depend o n the tran po...

Page 81: ...I 6 I I 5 I I 3 I 0 7 I 03 077 I I I 3 4 13 2 130 126 1 25 I 23 I I I 7 I I 3 I 0 7 I I I 144 142 I 40 I 3 6 I 3 5 133 127 I 2 3 I I 7 I I I I i I 54 I 52 I I 5 0 I 4 6 I 4 5 I 4 3 I 3 7 I 3 3 I 2 7 I 164 162 I 160 156 I 5 5 I 53 I 4 7 14 3 1 3 i I I I 74 I 7 2 170 I 6 6 i 165 I 163 I 5 7 I 53 I 4 7 I I I 204 202 200 176 I 7 5 I 7 3 I 6 7 163 I 5 7 I I 2 I 4 2 I 2 2 I 0 206 205 203 I 77 I 73 I 6 i...

Page 82: ... 0 1 0 I 1 1 1 4 4 1 0 0 1 1 0 1 5 0 0 1 0 1 I U 30 0 1 0 I0 1 154 1 I I 0 1 1 0 1 6 0 o i 0 1 1 1 0 60 0 1 0 I 0 I 0 1 6 4 I 0 I I I 0 I I 70 0 I 1 1 1 1 2 5 1 o 0 0 1 7 4 J 1 1 I I J 1 200 0 0 0 0 I 250 1 0 0 1 204 1 0 0 0 0 I 1 2 1 0 0 1 0 0 0 I I 14 5 00 I I 0 1 I 2 I 4 I 220 224 1000 1 i 1 0 1 0 I 230 1 1 1 1 i 0 P I I I 2 3 4 5 i 6 T B TB 7 55LC 0 Lower octal code in each box is code for pre...

Page 83: ...I 0 1 0 0 1 1 o I I I 4 5 0 1 1 l 0 o54 0 1 I 1 0 1 0 0 5 6 I 0 0 1 0 1 0 o60 0 I 0 0 I I 1 1 0 0 6 7 0 1 0 1 1 o64 0 0 1 0 1 1 0 0 I 8 0 0 I o i 0 1 070 o i 0 0 1 1 1 0 0 o I I I 9 5 0 1 o 0 0 o74 0 I 1 1 0 0 1 1 1 1 o i 0 0 1 0 0 0 0 0 0 0 0 1 0 1 3 I I 1 0 0 0 0 0 0 0 I 1 0 4 0 1 1 I _ 1 6 1 i 1 0 1 I I I I 0 0 0 0 I 0 0 1 0 I 1 9 1 i 1 0 1 0 1 1 4 0 0 I I 0 0 I 0 I 2 2 I I 1 I I 0 I 2 0 0 i 0 ...

Page 84: ...1 2 0 0 I 0 014 013 I i 1 4 0 1 1 0 o20 o 1 1 1 8 0 1 i 1 I o 2 4 0 0 7 2 0 0 1 0 1 o 3 0 o 0 5 2 5 0 1 0 0 034 o 02 I 2 8 I 1 I 0 0 040 0 I 3 5 1 1 0 1 o 4 4 0 4 0 1 i I I 1 1 o 5 0 0 I o 5 4 4 5 1 1 1 0 0 I 5 6 I 0 1 0 060 0 r 1 _ I I I 5 6 3 I 4 T B 16 ...

Page 85: ...I 0 o 4 3 0 1 1 0 i 0 o 4 5 i 1 200 0 I I 1 1 i 1 0 o 5 0 0 1 1 I 1 I 1 o5 3 0 1 1 1 0 1 o 5 5 400 0 1 0 0 1 o 6 0 I 1 0 1 0 1 0 0 063 0 1 I 0 1 1 0 065 800 0 I 1 0 0 1 0 070 i 0 I 1 i 0 0 I 1 1 o 7 3 0 I 1 0 I 0 0 1 o 7 5 1600 1 1 I 0 o I 0 1 1 0 0 i 1 1 0 0 0 0 1 0 3 i 1 1 0 0 1 0 1 0 5 I 3 20 0 1 1 0 I 1 1 0 1 1 0 I 1 1 I 0 1 1 1 1 1 3 1 1 0 I 1 I 0 1 1 1 5 6 4 00 1 2 0 1 I 1 1 0 1 1 I 1 I 1 0 ...

Page 86: ...NTL C N T L Grey Code I A Main SW 0 0 I I I 0 I Self Timer 2 I I Self Timer 10 I I I I Manual I I I I Auto 0 I I I Stopped I I I down Open I I 0 ADerture I I I 3 4 5 6 T B priority SSLC A T Dial __ t 18 ...

Page 87: ...pring Washer CSl 7078 6 Winding Lever Seat CFl 0250 S Washer N ea 2 Washer X9S 0604 190 200 4 Washer CAl 0966 7 C Ring CAl 0935 5 Winding Lever CFl 0269 X9S 0604 lS0 thru 170 9 CNTS Lever CAI 0932 10 ME Lever CAI 0930 1 3 Shutter Button 1 Shutter Button Assy 2 Washer X9S 090l BIO B20 CG9 0062 3 Washer CA1 IU6 1 4 Rewind Crank 4 Washer N ea X9B 0903 Sl0 820 5 A T Change Lever CAl 0960 1 Rewind Cran...

Page 88: ...rew X9l 1430 070 4 Screw 4 ea X91 l7J6 360 6 Turn the viewfinder information switch ON The switch should be on when removing or attaching the top cover to prevent bending the switch contacts 7 Screw 6 ea X91 1736 360 8 Top Cover Unit CG9 0048 1 6 Base Cover 20 1 Screw 2 ea x94 l701 110 2 Base Cover W Coupling Cover CAI 0905 CAl 4707 ...

Page 89: ...Front Panel Unit 1 Lead Disconnection Disconnect the leads shown above The origin of each lead is shown here for reference l Red Mgl 2 Black Mgl 3 Blue LM SW 4 White AELK 5 Sky Blue AECG 6 Red SAVE 7 Red SPDW 8 Blue SPDW 9 White A M Change Switch 10 Green A M Change Switch 21 ...

Page 90: ...nel unit can be removed with the pentaprism and DI D flexible circuit board atta c hed 2 When removing the front panel unit the SAVE flex i s pulled out from under the main flex 3 When the front panel unit is reinstalled the DI D flex connector may hit a capacitor on the bottom of the D I A board Insure that the DID fle x connector passes under the capacitor 4 When installing the front panel unit ...

Page 91: ...rque may be checked by wrapping a string around the spool and checking the tension required to turn the spool Spool Tensi on 254 292 g Spool Dia 13 mm Note Take care to use the correct tolerance for the t ype of test used Spool Gear CG9 0056 000 Fig 2 1 2 2 Shutter Unit Installation Adjustment 1 Count Switch SW 4 OFF position Adjustment The count switch should go OFF at L 0 1 0 3 mm from its posit...

Page 92: ...he spring just starts to move Fig 2 3 3 2nd Curtain Latch Lever Release Torque The force required to s e parate the armature from the yoke by pushing at F2 should be 60 t 5 g Measure where they just separate Adjustment Change spring CS2 6084 000 Fr F2 Fig 2 3 4 2nd Curtain Latch Set Position 1 Wind the shutter 2 Lt 0 3 0 5 mm When the armature is against the yoke Ad j ustment Instalation position ...

Page 93: ...slight clearance between them in the shutter wound position 2 If this adjustment is not correct the middle shutter speeds will not be correct 2 3 Shutter Speed Adjustment 1 The shutter speeds of this camera are all automatically controlled by the computer using the clock pulse as the standard The shutter speed adjustment is made by adjusting the count start CTST signal timing Section 3 3 2 2 Set t...

Page 94: ... 0 5 DIS or over Line B 2 0 ms or over Contact Efficiency at l 60 sec 70 1 ms contact Adjustment Bend X contact X Contact Safety Contact Timing During winding the x contact should never make and the safety contact should be on before winding is complete X contact ON OFF Safety contact ON OFF 1 Re Winding lease Fig 2 7 ...

Page 95: ...00 1 60 1 60 sec With dial set between 1 30 30 Selected speed With dial at B Bulb 3 Programmed Mode 1 60 sec 4 If the speedlites are not available the kludge hand made test device shown here may be used to simulate them Closing the switch simulated the 199A s manual shutter setting mode The 199A has a switch located on the top of the main body under the flash head This switch is marked AUTO MANU 1...

Page 96: ... Overcharge Adjustment 1 Install the front panel unit on the universal 900 c o limator 2 Push the lever as far as possible in the P direction and hold it 3 The mirror angle should change 16 to 48 from the normal position Fig 2 8 Adjustment Eccentric Screw A Mirror bounce prevention lever spring Mirror bounce prevention level Fig 2 8 Eccentric Screw A Note Improper adjustment may cause instability ...

Page 97: ...tment c 1 Set the AVO brush at Pl Pl Fig 2 9 2 Check between all points a thru e detail A There should be continuity between all pOints a thru e Adjustment Flush pattern position A Detail Brush B Detail C Detail PI Stopper P3 Fig 2 9 ...

Page 98: ...n is to be adjusted with this procedure the flange focal distance FFD should be adjusted before the front panel is removed Two ohmmeters are necessary for both be set on low OHM scales of meter A on fll and the minus this test They should Place the plus lead on a Fig 2 9 2 Place the lead of meter B on g and the lead on all also Fig 2 9 3 Using a depth gage slowly depress the maximum aper ture corr...

Page 99: ...rface 2 10 Maximum Aperture Signal Pin Code AVO The code output from the max aperture signal pin should be as shown in the table below Fig 2 10 5 6 4 5 4 0 3 5 2 B 2 5 2 0 loB 1 4 1 2 Pin height 5 70 6 00 6 30 6 57 6 90 7 15 7 46 7 72 B 10 8 3B to 05 a e a d a c a b mm 4 1 1 1 1 1 0 0 0 0 0 2 0 1 1 1 1 1 1 1 1 0 1 1 1 1 0 0 0 0 1 1 1 1 2 0 0 1 1 0 0 1 1 0 0 Note 1 indicates continuity near On a in...

Page 100: ...ns 2 Charge the mechanism so the AE c harge latch rest on the first upper step of t he AE charge lever Fig 2 11 AE Charge Latch r Fig 2 11 3 Put an ohmmeter from screw A to the Test Point Fig 2 12 Screw A Lead Red Lead Sky Blue __ Pattern 3 Pattern 2 Pattern 1 Test Point Fig 2 12 4 In this condition step 1 2 check that the AV brush 1s on the check bit position In this case the check 32 point 1s a ...

Page 101: ...on Adjustment AV Brush mounting position Check Bit Fig 2 13 2 12 Compound Gears Installation 1 Lube shaft and gears as shown in the lubrication chart Lube Lozoid 72090 2 Mesh the pawl of Compound Gear II CF1 0230 000 in the notch of Compound Gear I 3 Install as indicated in figure 2 14 Screw X9l l436 l50 Compound Gear II V CF1 0230 CF1 0230 A l otch Compound Gear I I CS1 0152 CS1 0152 Fig 2 U 33 ...

Page 102: ...meter Riveted Dowel o Scribed Line Winding Fig 2 15 Line Riveted Dowel 2 To adjust change the mesh of the sprocket gear with relation to the compound gear II Change the sprocket gear not the compound gear Notes 1 To move the perforations toward the speol end change the mesh one or two teeth in the spool direction For a slight change change the mesh by four teeth 2 To move in the cartridge end dire...

Page 103: ...14 4498 000 which make up the bearing 4 Mesh one of the wide teeth on the winding shaft with the plain area on the intermediate Idler Gear CS2 0364 000 as shown in figure 2 17 A Winding Shaft Intermediat r Idler Gea t B II _ C Fig 2 17 Wide Tooth Plain Section 5 The mesh should be so that the flat section of the end of the winding shaft is perpendicular to the centerline of the camera body Fig 2 1...

Page 104: ... Charge Gear Installation 36 1 Install the parts as shown in figure 2 19 Charge Gear Unit t l CG9 0068 Steel Balls I 14 4498 xiS a Fig 2 19 e Screw 1I X91 203S 360 eMO Coupler I CA1 0917 LJ Alignment Scribed line and dowel Fig 2 20 ...

Page 105: ...out 200g to pull the film taunt 3 The perforation position should be as shown in figure 2 16 Readjust if necessary as stated in section 2 13 2 Note If this adjustment is not correct the multiple exposure ME lever will not engage 2 17 Sws SWs Adjustment Caution If this ad j ustment is not correct there is a possibility that the camera will not function 1 Wind the camera 2 Set the brush so that it F...

Page 106: ... Note Align 1000 on the A T Indicator CSl 8154 000 with the mark on t he A T Dial CFl 0245 000 Fig 2 23 Install the LED figure 2 24 Nut I CAI 094S icator I CSI SI54 CJ IA T Dial CF I 0245 with the leads placed as shown in A LED 7f X65 5279 Screw XAI 1l70 357 Screw J CAl 0950 XAI 317 I I i 3 Q JDial Base Fig 2 22 ...

Page 107: ...m set as described in step 3 it should be possible to push the winding reset lever in the A direct on as shown in figure 2 26 5 Wind the camera halfway and stop 6 In this condition it should be possible to move the ME coupler a considerable amount in the setting direction but not enough to set the detent 7 Adjust step 4 and step 6 with the eccentric screw shown in figure 2 26 iPl E Ring I Spri ng ...

Page 108: ...e open position Adjust with Eccentric Screw A Fig 2 27 3 Close the eyepiece shutter 4 There should be no lay in the blades in the closed position Adjust with Eccentric Screw B Fig 2 27 Eccentric Screw Fig 2 27 ME Shaft 2 21 SPC Output Adjustment 40 1 Mount a FO SOmm 1 1 4 Lens 2 Attach test leads to the I BUS CLK and SYNC 07 test pads on the ridge of the main flex over the pentaprism Fig 2 28 ...

Page 109: ...ctal code See the EV Bva code Table K 125 SPC aUTPUT BVa Code Adjustment Brigh ness cd m or nt Center Limits Adjustment Interaction 64 142 136 146 VRG Ql 512 172 166 176 VRG VRL 4096 222 216 226 VRL Fig 2 29 Notes 1 The SPC output BVa is independent of the settings of the ASA or A T dials 2 Sh ield the SPC from extraneous light Any light other than that coming thru the lens will change the adjustm...

Page 110: ... should indicate an open circuit at both ends and continuity in the center 4 Adjust with the eccentric screw so the OFF ON 00 OFF condition is met Note This adjustment affects exposure accuracy Readjust if the top cover or the ASA Contact is changed Refer to the tools instructions for the SV Check Bit 1S 2 23 Diaphragm Accuracy Check 42 This adjustment checks the accuracy of the programmed control...

Page 111: ...ovided Note This adjustment is necessary if electrical components are changed Poor operation of Mg l may cause large variations in this test Viewfinder Indications should be disregarded 2 24 Viewfinder Display Adjustment Adjustment of individual digits within the display is not possible Limited adjustment of the display unit is possible to correct positioning or tilt within the mask Adjustment is ...

Page 112: ...e of the focusing screen This surface has ridges on the front and rear edges The rear r idge is the longer of the two 2 When the focusing screen is changed check the focus and exposure 2 26 Pentaprism 1 Install the pentaprism with the parts shown below Fig 2 32 Front Spacer CAl 1l36 CAl S019 pacer t O 2 13 8488 Fig 2 32 ...

Page 113: ...s completely to block light leaks Apply on all sides except the rear eyepiece side Fig 2 33 Liquid Light Shield Frame Spacer Fig 2 33 2 27 Viewfinder Mask Installation 1 Install the mask so that the narrow side is to the right winding side 2 Press the mask toward the standard surfaces Fig 2 34 Wide Side Fig 2 34 Marks Indicate Standard Surfaces Narrow Side 45 ...

Page 114: ... 01S 46 2 Spool Mechanism Spool CFl 1411 Photo lub PL 01S 3 Wind Rewind Mechanism Winding Base CF1 0231 Sprocket Shaft CAl 472S LT SH Idler Spring CSl 6113 Lozoid 72090 ir Compount Gears CFl 0230 Lozoid I 72090 CS1 01S2 I Lozoid __ 72090 _ Idler Gear CS1 01S4 clEf I Lozoid i 72090 t 1 Body bearinq Winding Unit Shaft CG9 0063 GE 7 LoZOid 72090 ...

Page 115: ...2090 Charge Gear Cam CG9 006B LoZ01 d 0 1l6 72090 Tripod Socket CAl 470B GE 7 Winding Lever CFl 0269 Winding Shaft CFl 0236 oto lub PL OIS Rewind Shaft CAI 09Bl Rewind Crank NS Photo lub PL OIS Connecting Lever Unit CG9 0094 47 ...

Page 116: ...48 4 Miscelleanous CNTL Coupler CFI 0239 Photo Iub PL 015 d Steel Balls Lozoid 172090 ME Coupler CFI 0240 Photo Iub _ PL 015 ...

Page 117: ... 1 Master Shaft Gear Astro oil Bushinqs 1st Curtain Astro oil 1st Curtain Astro oil 2nd Curtain Astro oil 2nd Curtain Latch Astro oil Cam 1st 2nd Curtain Low temp EP Brakes Windinq JL Low temp EP Stopper Shaft Drum Collars Shaft Bushinq I a a Astro oil Pinion Shaft Bushinq 1 0 9 00 I Release Lever J Low temp EP 49 ...

Page 118: ...TY VSA Aperture Si9n 1 Lever rear eurface OTY IliA irror UTUI I0 wet 85 of aurface Mirror pivot UTLM I0 Wet aSH of au rface H var M irror Return SpO lc rear r V7 _ UTLM IO OTY VSA NO LOBI M 1 rror up Pin Lo i d 1120 0 M i rror Cl p Levere Lolold 1 J2090 OTY 2 0 eadh part NOTES Ouantitie are coded A nu ber uch a 2 or 2 S indicat aa a droplet of that dhmeter lSA very s aU AlIIOunt SPA S lle t Poa ib...

Page 119: ...cant digit MSO at the right The time base TB position numbers indicate the power to which the radix 2 is raised For this reason the binary code is converted to octal code as illustrated in the example below Sample All measurable data is presented 1n active low configuration In other words the ground or lower level 1s a lit and the higher level 1s a 0 It is necessary to remember this when reading w...

Page 120: ...er speed manual mode Ivl EF Ve 5 4 AV 16 VI ve Ve 16 V2 ve V3 ve Ve 16 2 eee 12p f 2 8 f O f 5 6 Fig 3 1 Identical in principle to eee and ve in AE l this signal automatically switchs the shutter speed to 1 60 when the flash is ready The A I ve is 1 2l9V 35mV In addition the A l has a slow shutter mode when used with the SPEEDLITE 199A for automatic and manual shutte r speeds speed manual The curr...

Page 121: ... 8 bits Word 1 1s brightness code and Word 2 is mode information T B O T B I DV V BV Yo EF M AE BCK EF I EF 2 1 U Fig 3 3 T B 2 T B T B e T B T B T B 1 BV On BV I BV 2 BV BV 8 BV 16 MODE I MODE 2 DISP LV AOCE 00 MODE I MODE 2 0 0 0 I I 0 I I Fig 3 2 5 o j l o l 2 V O O I V Use Bus Checker Wave form BUS Checker Trigger Fig 3 3 and Fig 3 4 are I Bus samples Word 1 BV is identical in eachsample but W...

Page 122: ...0100001 MSD Binary to OCtal Conversion Octa l Code 204 From EV avo Table 204 AVO 1 2 EV 13 Fi 3 5 is the same I Bus output but expanded to show only Word 1 BV Binary code 10101110 MSD or 1 0 1 011 1 0 Binary to Octal Conversion 101 5 011 6 10 1 Octal code 165 From EV BVO Table 165 AVO 2 5 EV12 As noted before Bus Checke r reads with the least signifi cant digit at t he l eft ...

Page 123: ...Checker Circuit and Clear circuit During normal operation El is present at pin 17 When the battery check switch is closed it is grounded Note Circuit clear takes place when button is pressed but since battery check actually energizes Mgl and Mg3 the outward signs of clear are not apparent until the button is released 8 TP 18P Temperature compensation circuit Output approx O 6V 9 EV 18 19P Normally...

Page 124: ...t adjus tment AR OU1 Vc W r JL1 I 2 AR3 Fig 3 8 12 CAD 3P 20 V io S _ Brightness Analog to digital convertor amplifier output to AID capacitor CAD 1 AD Time T After metering is started a delay of 3 AD time units takes place before digitally converted BV information is sent from the Input Ie thru the I BUS to the CPU Ie This is to provide stabilization time for the SPC See also 17 AR5 OUT 68 ig 3 9...

Page 125: ... ARa AR ART High BV Small H Short t2 lARa Low BV Large H Long t2 0 T is fixed Fig 3 10 See also Fig 3 15 Fig 3 16 13 CAD 4P BV AID convertor capaCitor CAD input to amplifier 14 El 5P Main supply voltage for all circuits Approx Battery voltage 0 3V 15 KVC Standard control voltage for most circuits 16 AR5I 7P KVC 1 625 i 5 See also Fig 3 17 Note KVC rather than Vc used in the AE l is the standard vo...

Page 126: ... AR5 operational amplifier which is MOS OUT from OPT Ie See also 17 OUt of AR5 operational amplifier which is amplified MOS OUT H T I t ti I ft f I ARII AR2 ARI Fig 3 13 AR o H varies with brightness High BV H is small Low BV H is large o t l is fixed at 10 mS ...

Page 127: ...n the AID conversion whose waveforms are shown in Fig 3 10 and 3 13 The following is true T T tl t1 and t2 t2 ARe CAo r NULL I _ __4 1 NULL2 Ve AR3 Fig 3 14 5 50 mV 5 I I W w J 2c j mV Fig 3 15 Pig 3 16 11 Fig 3 15 and 3 16 show the ARS output and CAD waveforms superinposed for easy understanding Fig_ 3 15 High BV Fig 3 16 Low BV 61 ...

Page 128: ...r supply EL latch in circuit It l oc ks the El supply on for long enough to cover the shutter operation time plus the cycle time before and after the actual shutter operation This provides a power sup ply even if the shutter button is not pressed thro ghout the operation Ex For 1 2 sec shutter the El LK gate is approx 600 mS long I I _ _ J I 2 2 V D D IV ...

Page 129: ...s This allows CT to charge When it reaches O 62SEl the count start comparator changes states and shutter tlmm 1ng starts S 14 OFF CT Charge Curve 0 625El 1 0 1 2V 1 O O lV The count start CTST timing is adjusted by VRT This adjust the slope of the CT charge curve so the start of the shutter timing to coincide with the time when the leading edge of the slit just enters the aperture See also Fig 3 5...

Page 130: ...Interface IC for IGl operation See notes 2 and 3 on the Exposure Timing Chart I 2 2 V T l O O IV Fig 3 21 4 Bias 4P Gate length T varies with the aperture being set Smaller apertures require a longer gate This is a bias voltage originating in the eSC Interface IC which is used in the CPU IC to raise the base reference voltage waveforms to an approiate level for operation The bias voltage is normal...

Page 131: ... signal for opera tion There is no separate SMG211 The combination of SMGl low and a 5 InS SMG3 high after 12 InS of SrlG3 low provides the acitvatlon signal for MG2 See also Fig 3 43 Trigger 07 This is the film speed ASA gray code input to the Cpu I y l Fig 3 23 Gray code LSD 000011001 I 12V I I I r 2 3V O 4 0 SV Fig 3 23 SV code is from TB2 thru TB7 SV 011001 ASA 100 65 ...

Page 132: ...A T dial It is in Gray code Gray Code LSD 00110100 t o T B 7 is 0 Shutter Speed Priority Mode SSLC 12V I I Fig 3 24 12V Xii r 12 1 Fig 3 25 r 2 3 0V O 4 0 6V T B 2 thru T B 6 indicate shutter speed selected 11010 1 1000 sec I l In Fig 2 35 Gray Code T B 7 is 1 indication that the camera is set to the AV Aperture priority mode T B 2 thru T B 6 Gray Code 11010 From the AV Code Table this is f 19 ...

Page 133: ...rture metering manual and the self timer set to 2 seconds The T B 7 code 0 also indicates shutter speed priority Trigger 07 This is the code for the maximum aperture of the lens mounted on the camera If no lens 1s mounted the code 1s the code for f 5 6 This code actual ly serves the dual purpose of AVO maximum aperture information input and AVe maximum aperture correction The AVC signal actually o...

Page 134: ...Fig 3 29 uS J L I 1 4 1 6V o O IV Tool and Trigger Bus Checker Camera TV 1 1000 The visable 0 Bus output 1s binary code of the TV and AV signals Fig 3 28 Figure 3 29 shows the oscilloscope waveform of the TV signal first word and AV signal second word Fig 3 i9 Word 1 Binary Code 01011001 TV Signal Code T B 2 7 011001 converts to Octal Code From the TV Code Table 230 z 1 1000 sec shutter speed The ...

Page 135: ... the camera is in AV pri ori ty mode T B 0 and T B 1 do carry shutter speed information although it is modified for rounding off the display information to the nearest 1 2 step shutter speed IV For example in figure 3 30 word 2 is 00110010 which converts to octal code 114 or f 19 Fig 3 30 Word 1 indicates the shutter speed calculated by the camera Using the entire binary 10010001 converts to octal...

Page 136: ... l ectrode plate SAVE to the CPU IC It consist of an ON OFF seri es as the brush passes over the plate Trigger SMGl leading edge negative going Note This waveform is included for informa tion only It is not normally possible to simultaneously dis play three waveforms This waveform shows the relatiopship between the SAVE signal SMGl s ignal and the release of MG1 I ...

Page 137: ...ver the pentaprism Figure 3 34 is the 07 wave form There are 8 bits 1n one cycle of the 07 wave form numbered from the left T B 0 thru T B 7 The last bit 07 is a low and the others are all highs Since this unit uses eight bit words T B 0 thru T B 7 define one word When 1 looking at wordforms it is convenient to take the oscilloscope time base off the calibrated position and adjust the sweep length...

Page 138: ... 35 16 I Bus 16P This t s the input for the I Bus information See also 3 2 3 17 KVC 17P This is t he standard r eference voltage input KVC 1 625 5 lS DISP lSP Input signal from viewfinder display switch SW3 When the switch is on the display is off and pin lS is at ground When the switch is off the display is on and the voltage at pin lS is approximately 1 to 1 2V I Fig 3 36 1 0 12V OV ...

Page 139: ...WS winding completion signal input 1 0 1 2V When winding is complete this pin is at ground This signal releases the 0 El latch EILK Fig 3 38 2l AE LK This signal retains the BV signal present at the I O I 2V time the AE LK is actuated The exposure value will 0 remain the same even if the A T dial is changed The calculated value will Fig 3 39 change to maintain the same EV for the value which has b...

Page 140: ...ether 12 mS later SMG3 goes hiqh for 5 MS This release MG2 It also electrically releases SMG3 but it is still latched mechanical ly When viewing the MG2 waveform the C47 charging curve is noticable 2 MG3 2P This is the operation signal for the 2nd curtain magnet MG3 As menti oned above MG3 is turned off once but it does not rel ease because it 1s held mechanically Fig 3 42 shows the release curves...

Page 141: ...re actually release 3 SMG3 3P tv SMG3 is the MG3 operation signal from the CPU Ie The following three waveforms Fig 3 43 44 45 illustrate the signal f 1 tFlg 3 4 1 j l nL JIr SMG3 C 1o 3 43Y 10 3 44 Fig 3 43 Trigger SMGl negative going This shows the 5 to release MG2 12 mS after SMGl go low together mS gate used It occures and SMG3 75 ...

Page 142: ...ithout the reverse current s pike This waveform shows both the false release and true release The reverse cur r e nt spike can be seen in the true release at the right edge 4 Bias 4P Bias voltage output for the CPU operation Bias 3 5 4 0V 5 SMGl 5P MMl operational signal gate See also 3 3 3 6 CTST 6P Count Start signal for shutter timing See also 3 3 2 ...

Page 143: ...et coils Coil current S rnA With SWl on approx 0 3 V 12 vco 12P Input to voltage controlled oscillator for the battery checker Frequency is adjusted by changing capacitor CVCO With SWl on V about 1 volt when the Battery Check is pushed the voltage is about 1 5 V pulse height With 6 V input frequency should be 6 2 Hz At 3 5 V frequency should be 2 Ie 1 Hz 13 PNP 13P When E1Lk signal is applied to p...

Page 144: ...ed Uneven release of MGl the AE mechanism and shutter can be GND seen When the currnet is terminated a very high voltage spike occures To control this a zener diode 1s incorporated into the IC which limits the spike to the Pl level shown in Fig 3 47 When the yoke and armature actually separate another spike occures The timing and size of the spike are affected by condition of the magnet Contaminat...

Page 145: ... 3 48 thru 3 50 are examples of incorrect performance Figure 3 48 shows a normal condition left and an oily armature condition right Figure 3 49 illustrates noise Figure 3 50 illustrates no regulation of first spike due to breakdown of the ZO Voltage V Notes 6 V 6 V Tie point for SW4 and the CNST signal timing R C circuit 79 ...

Page 146: ...a connector the easiest method of troubleshootinq is by replacement 1 I ADJ lP Input to current adjustment circuit for seqment drive 2 Diqits and Seqments Each diqit is made of seven seqments D2 thru D7 are normal alphametric 7 seqment diqits Dl is a special digit Six segments form the letter M for manual The seventh seqment is the decimal point between D6 and D7 1 Diqits BBBBBBf 1 02 03 04 05 06 ...

Page 147: ...to the 06 The result will be better separation Wave A In Fig 3 54 06 is low 1 so the gate is open for a lighting command from any of the segments Now that we know that the digit 6 gate 1s open we can check Segments a thru 9 to see which segments of digit 6 are lit From Fig 3 55 we can see that segments a of digits 0 2 3 4 and 7 are lit Segment a of 06 1s not lit Segments are active high i e a posi...

Page 148: ...ddle Trace Bottom Trace SW4 CTST MGJ 11 5 S Shutter Speed Fig 3 56 1 1000 sec Fig 3 57 1 500 sec 5V 0 1 I U 82 Fig 3 58 SHGl Trigger Top Trace Middle Trace Bottom Trace MG2 SAVE MGl Fig 3 59 Aperture Fig 3 58 Fig 3 59 f 2 8 f 5 6 f Note These triple waveforms cannot be displayed simultane ously on most oscilloscopes 1 t ...

Page 149: ...nd flash synchronization They should be checked well whenever an IC 1s changed IC Removal and Replacement Tool This soldering aid is simple to build and use It greatly reduces repair caused failures We recommend that each shop make at least one of each emoval End IC Installation End Copper Plate Note The taper makes the tool easier J L to insert under the flex Fig 4 1 Copper Plate Dimensions 14 0 ...

Page 150: ...he voltage from pin 8 MOS OUT to ground V2 5 If V2 is within 0 2 mV of Vl no adjustment is necessary Pig 2 2 Offset Adjustment If V2 is not within 0 2 mV of Vl adjust in the follow ing manner Fig 4 3 1 Remove resi stor R NULL ADJ and replace it temporarily with an approximately 30Rn variable resistor 2 Adjust the variable resistor until Vl and V2 are within 2 mV of each other ...

Page 151: ...prefered but a shutter tester can be used in a frequency counter is not available Frequency Counter Method 1 Attach the frequency counter between the camera ground body earth and the CLK Pad Fig 2 28 and read the oscillator frequency 2 The limits are 30 117 to 34 134 Hz If it is within the limits no adjustment is necessary Shutter Tester Method 1 Set the camera to TV Priority and 1 60 sec shutter ...

Page 152: ... 3 RISET Check and Adjustment This adjustment adjust the constant current supply for magnets Kgl and Kg3 to 8 rnA 1 Remove the black lead from the 2nd curtain magnet Kg3 and install a milliammeter in the line 2 Release the shutter at bulb B and read the ammeter The curren should be 8 rnA lOt 3 If the current is not within the limit replace the RISET resistor which is normally about 4 5 KO with one...

Page 153: ...Vl and V2 should be within 0 1 mV of each other If they are not the NULL adjustment must be made Adjustment Method Note ADNUL ADJ Resistor Normally approx 20KQ Identical to the OPT IC OFFSET adjustment If the following are correct the AID NULL is normally correct i If the SPC output is correctly adjusted by VRG and VRL Section 2 21 or ii If the camera stops down to the correct flash commanded aper...

Page 154: ...r It affects the the The factory adjustment requires too l s test equipment and IR soldering techniques not available to service facilities The criteria for service will be the brightness as visually determined by the repair person If the display is too bright or dark replace RIADJ Fig 4 6 A higher resistance wil l reduce the brightness DECODER DRIVER IC RX DI n Fig 4 6 ...

Page 155: ...er Degital Tester VOAC707 50 004 2 or Aoouraoy Voltage Measuring Unit 1 mV 2 3 Standard Brightness Checker SU 003 2 or Luminance Meter 2 4 Ohm Meter 2 5 EE Camera Tester Mode14P 27C 2 55 003 4 CEE IAC or Equivalent 2 6 Bus Checker SE 164 2 7 SV Check Bit Tool 1S SE 165 2 8 Oscilloscope 3 1 Universal Range Viewfinder Collimator SU 006 2 or Universal Range finder Collimator 4 1 Universal Type 900 Co...

Page 156: ... Aperture Correction Pin 7 3 Torque Gague Head ST42 C12 l40l IS SE 138 7 4 Retaining Ring Plier AOG SE 142 7 5 AE Evaluation Standard Lens SE 153 7 6 160 Winding Lever Tightening Tool 1S SE 166 7 7 Rewind Fork Knob 1S SE 167 7 8 C12 l40l Test Battery Adapter SE 143 7 9 Regulated D C Power Supply Model 532C SD 001 LOCAL PURCHASE BTll CAl 0948 1E BZ99 l3 4611 1T Common to New Canonet QL ...

Page 157: ...ing Spaner Tightening Sprocket Shaft BZ99 l9 9509 lS Common to EF TBll CAl 4918 lS Common to AE l TB39 CSl 1768 lS Common to AE l Tightening Winding Lever TB39 CAl 4977 1S Common to AE l Tightening Sprocket Gear TB39 CS2 0356 1S Common to AE l 91 ...

Page 158: ... o u ooo e oo I OOO e oo ooo ClUS I OlIo IIOC I n I I OIlOU IIOC u I I ell OIIO IOC SU I IIHCII OIlOUIH in I I I I I OICOI 0 110 11 In I I I I I 1 Olloto I I I 0 Ollotl sn I eu uo ooo cu un_ooo 10101 0 cu U ooo C I II00_HI 111 0 1 IUO oIO _1 0 UI ll O 0 01 1 0 0 0 140 1U O 01 IJO U 0401 0 U 0401 200 O Ol lOO IU 0I0l JlO It 0I02 no 0 0 110 o o no I I OUUI fIO U U U CHll ell levu NCr Sell lI N riC S...

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