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Главная страница » Camera repair manual
MALFUNCTION | PROBABLE CAUSE | REMEDY | Electronic flash fires when connecting cord is inserted in electronic flash socket and shutter is released. | Grounded short contact spring (9) fig. 30 | Remove ground. Replace insulation plates (7), (8) and (10) fig. 30 if required | | Helical spring (28) fig. 35, disengaged from insulated stop and touching short contact spring (9) fig. 30 | Relocate spring against stop | | Foreign matter between contacts of precontact switch (3) fig. 4-15 | Remove foreign matter | Electronic flash fires erratically. | Intermittent open in electronic flash socket | Repair or replace socket | | Intermittent open in electronic flash socket lead (16) fig. 30 | Resolder or replace lead | | Intermittent contact of precontact switch (3) fig. 4-15 due to foreign matter | Remove foreign matter | | Dirty, pitted or burned contacts or precontact switch (3) or main contact switch (4) fig. 4-15 | Clean switch contacts. Replace switch components if required | | Broken or disconnected ground wire (11) fig. 30 | Resolder or replace wire | | Loose guide spring retaining nut (12) fig. 30 | Tighten nut | | Insufficient tension of short or long contact springs (9) & (3) fig. 30 in main contact switch | Adjust tension of springs | | Short contact spring (9) fig. 30 too far fiom long contact spring (3) | Reset adjusting eccentric | | Lower actuating plate of shutter brake does not close contacts of main contact switch (4) fig. 4-15 | Readjust, clean and lubricate brake assembly | Scratches on emulsion side | Film tracks rough | Hone tracks | of film. | Curved bracket (38) fig. 35 too high | Readjust or replace bracket | | Insufficient tension of compensating friction clutch, fig. 1-2 | Adjust tension |
MALFUNCTION | PROBABLE CAUSE | REMEDY | Scratches on back of film. | Foreign matter on pressure plate (3) fig. 23 Damaged or scratched pressure plate | Clean pressure plate Replace pressure plate | Image on film unsharp. | Rangefinder out of adjustment Lens flange-to-focal plane distance incorrect Lens flange not parallel with film tracks | Readjust rangefinder Adjust distance Adjust lens flange or film tracks | Rangefinder does not indicate correct distance. | Note: Lens flange-to-focal plane distance and par parallity must be correctly adjusted before troubleshooting range-finder. Roller arm, fig. 4-27, out of adjustment Roller arm, fig. 4-27, bent | Adjust eccentric cam A and eccentric shaft Straighten roller arm | Rangefinder roller arm does not follow lens focusing cam. | Objective lever tension spring (7) fig. 26 disengaged Objective lever (13) fig. 26. ballbearing pivots too tight | Re-engage spring Readjust bearing tension or relubricate | Rangefinder movable image only visible in viewfinder. | Beam splitting prism separated | Replace range-viewfinder assembly | Viewfinder field dark. | Beam-splitting prism, separated | Replace range-viewfinder assembly | Bright-line frames have hair lines. | Glass plates (6) fig. 27, decemented | Replace frame assembly | Bright-line frame does not move or position correctly when lens is mounted on camera or when roller arm or frame selector is actuated. | Glass plate mount spring (3) fig. 27 disengaged Metal mask spring (1) fig. 27 disengaged Foreign matter between bright-line frame carrier and glass plate mount (4) fig. 27 Foreign matter between metal mask (7) and glass plate (6) fig. 27 | Reengage spring Reengage spring Remove foreign matter Remove foreign matter |
Section II. EXPOSURE METER MALFUNCTION | PROBABLE CAUSE | REMEDY | Needle does not reach test dot | Battery voltage too low | Replace battery | Needle goes beyond test dot | Wrong battery (Voltage too high) Test resistors have open circuit or changed value | Replace battery Replace test resistors | Sluggish reading | Pivots of movement defective Foreign matter | Replace meter circuit insert Clean | Coupling wheel does not turn | Broken gear | Replace gear | Coupling wheel does not turn speed dial of camera | Broken coupling pin | Replace pin | No reading | Exhausted battery Open circuit in coil assembly Short in coil assembly Bad switch contact | Replace battery Replace meter circuit insert Removing short Clean and repair switch | Erratic reading | Bad contact of release button Bad contact of battery test switch Tension of contact spring too soft | Clean and repair release button contact Clean and repair test switch contact Tension springs | Needle does not reach zero or calibration point | Maladjusted | Readjust with adjusting screw If adjustment not possible replace CdS cell |
Malfunctioning of a photo-resistor exposure meter may be divided into three categories; mechanical, electrical, or fatigue of the CdS cell. a. Mechanical malfunctions are generally obvious, and a careful examination of the meter will usually reveal the cause. b. Electrical malfunctions require tracing the circuit with a multi-meter, checking resistors, and contacts. c. The cadmium sulphide photo-resistor is adversely affected by prolonged exposure to an intense source of light. Its memory may result in incorrect or erratic meter readings. If the CdS cell is a suspected source of trouble, the meter should be protected from light for a period of 12-hours before checking the circuit electrically. d. Troubleshooting Chart.
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