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100 microfarads Flash bulb 22-1/2 volts Rectifier 10K ohms To synchronizing contacts Figure 1-17. Flash Unit Circuit, Schematic. (2) Circuit (fig. 1-17). The capacitor charging circuit is closed by inserting a bulb in the flash unit socket. Current flows from the battery through the filament, the capacitor and resistor. The resistor limits the current to a value lower than that necessary to fire the bulb. When the synchronizing contacts of the camera are closed, the capacitor discharges. The flow of current (which bypasses the resistor) is through the filament of the bulb, connecting cord, camera synchronizing contacts, and the rectifier. Ignition of the lamp destroys its filament and opens the circuit.
CHAPTER 2 TROUBLESHOOTING Section 1. CAMERA BODY 2-1. General The photographic effects of equipment malfunctions are detailed in paragraph 4-8 of the KS-15{4) Operators Manual TM 11-6720-244-12. Mechanical and optical malfunctions of the camera body are listed in the following troubleshooting chart. NOTE: Gauges and test equipment should be used at all times; not only to pinpoint the malfunction, but to make certain the equipment is properly adjusted. The camera body should be completely checked, and all malfunctions located, before repair is started. a. Most malfunctions will become obvious to the experienced repairman by a careful examination of the camera. Other malfunctions may require partial disassembly of the equipment. b. After the camera has been repaired and adjusted, it should be tested photographically. The final test of any photographic system is its ability to accurately and clearly record information. The processed film should be examined for frame position, evenness of exposure and exposure density, image sharpness and scratches. c. Troubleshooting Chart. MALFUNCTION | PROBABLE CAUSE | REMEDY | Shutter release knob cannot be depressed. | Release disc (14) fig. 35 loose Release sleeve (32) fig. 21. has shifted | Tighten disc Reposition sleeve slot in pin | Shutter does not release when release knob is depressed. | Foreign matter or rust in shutter mechanism | Remove foreign matter | Shutter curtains do not open when release knob is depressed. | Flat spring (20) fig. 35 incorrectly adjusted Arresting lever B (34) fig. 31. incorrectly adjusted Foreign matter between bottom cover plate (5) fig. 25. and flat spring (20) fig. 35 | Adjust flat spring Adjust arresting lever B Remove foreign matter | Winding lever loose, no friction. | Loose screw ring (6) fig. 21 Defective spring washer (7) fig. 21 | Tighten ring Replace washer |
MALFUNCTION | PROBABLE CAUSE | REMEDY | Winding lever cannot be advanced. | Foreign matter in winding, shutter or release mechanism Loose sprocket wheel shaft bearing (47) fig. 35 Two-part intermediate gear (25) fig. 35. incorrectly positioned | Remove foreign matter Tighten bearing Re-align gear | Winding lever will not fully wind shutter. | Defective ratchet plate (7) fig. 34 Broken or misaligned gear in winding or shutter mechanism | Replace ratchet plate Replace or re-align gear causing the malfunction | Frame counter rotates to freely. | Defective spring washer (30) fig. 21 | Replace washer | Rewind knob pulls up with difficulty, or will not stay up. | Defective slotted friction sleeve (23) fig. 21 | Replace sleeve or clean and lubricate | Rewind knob turns with difficulty. | Dry rewind assembly bearings | Clean and relubricate | Rewind knob will not rotate. | Damaged rewind assembly gears | Replace damaged gears | Rewind knob rotates without rewinding film. | Sheared rewind knob shaft key. Defective forked carrier (24) fig. 21 | Replace rewind knob Replace carrier | Frame selector lever will not position bright-line frames. | Defective range-viewfinder mask adjusting mechanism Spring (33) fig. 39, disconnected from frame selector bars, or defective | Repair or replace mechanism Reconnect spring, or replace | Reverse lever remains in R position when winding shutter. | Defective coupling disc, fig. 1-2 Defective camshaft (17) fig. 36 | Replace coupling disc Replace camshaft. | Delayed action lever will not fully wind clockwork. | Loose screw (1) fig. 39 Broken main spring (1) fig. 29 in clockwork | Reset winding mechanism and tighten screw Replace spring | Delayed action release button will not activate clockwork. | Foreign matter in delayed action release clockwork | Remove foreign matter | Lens lock release remains in depressed position. | Foreign matter under C clip (18) fig. 39 | Remove foreign matter |
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