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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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