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Section III. LENSES

MALFUNCTION

PROBABLE CAUSE

REMEDY

Fits too loosely in camera

35mm Lens (fig. 42)

Damaged bayonet mounting lugs Locking slot damaged

Replace helical focusing assembly (25) Replace helical focusing assembly (25)

Fits too tightly in camera

Damaged bayonet mounting lugs

Burrs on base of lens or bayonet mounting lugs

Replace helical focusing assembly (25) Remove burrs by honing

Positions other than 35mm bright-line frame

Bayonet lug engaging frame selector damaged

Locking slot damaged

Replace helical focusing assembly (25) Replace helical focusing assembly (25)

Rangefinder image jumps when focusing lens

Burrs on rangefinder cam of helical focusing assembly (25)

Remove burrs by honing

Rangefinder images do not coincide at infinity

Damaged bayonet mounting lugs

Burrs on base of lens

Replace helical focusing assembly (25) Remove burrs by honing

Focusing ring can be rotated without focusing lens

Loose retaining ring (19)

Tighten retaining ring

Incorrect f/stop indexing

Loose retaining ring (5) Loose retaining ring (10)

Tighten retaining ring Tighten retaining ring

Buckled diaphragm blades

Dirty diaphragm blades Damaged diaphragm blade

Clean diaphragm blades

Replace damaged diaphragm blade

Fits too loosely in camera

50mm Lens (fig. 43, 44) Damaged bayonet mounting lugs

Locking slot damaged

Replace helical focusing assembly (6). fig. 44

Replace helical focusing assembly (6)

The photographic effects of lens malfunctions are listed in TM 11-6720-244-12, paragraph 4-8. Mechanical malfunctions are detailed in paragraph b below.

a. Malfunctions. Mechanical malfunctions are generally obvious. Poor optical performance may require photographic testing to establish the cause. All lenses should be checked photographically after being repaired.

b. Troubleshooting Chart.



MALFUNCTION

Fits too tightly in camera

PROBABLE CAUSE

Damaged bayonet mounting lugs

Burrs on base of lens or bayonet mounting lugs

REMEDY

Replace helical focusing assembly (6) Remove burrs by honing

Positions other than 50mm bright-line frame

Bayonet lug engaging frame selector damaged

Locking slot damaged

Replace helical focusing assembly (6) Replace helical focusing assembly (6)

Rangefinder image jumps when focusing lens

Burrs on rangefinder cam of helical focusing assembly (6)

Remove burrs by honing

Rangefinder images do not coincide at infinity

Damaged bayonet mounting lugs Burrs on base of lens

Replace helical focusing assembly (6) Replace burrs by honing

Focusing ring can be rotated without focusing lens

Loose retaining ring (16), fig. 43

Tighten retaining ring

Incorrect f/stop indexing

Loose set screw (4) Loose set screws (6)

Tighten set screw Tighten set screws

Buckled diaphragm blades

Dirty diaphragm blades (12) Damaged diaphragm blade (12)

Clean diaphragm blades

Replace damaged diaphragm blade

Fits too loosely in camera

135mm Lens (fig. 46, 47, 48)

Damaged bayonet mounting lugs Locking slot damaged

Replace bayonet ring (3). fig. 47 Replace bayonet ring (3)

Fits too tightly in camera

Damaged bayonet mounting lugs

Burrs on base of bayonet ring or mounting lugs

Replace bayonet ring (3) Remove burrs by honing

Positions other than 90mm bright-line frame

Bayonet lug engaging frame selector damaged

Locking slot damaged

Replace bayonet ring (3) Replace bayonet ring (3)

Rangefinder images do not coincide at infinity

Damaged bayonet mounting lugs

Burrs on base of bayonet ring

Loose screws (2)

Bent coupling in differential cam assembly (8)

Viewing unit incorrectly collimated (fig. 48)

Replace bayonet ring (3) Remove burrs by honing Tighten screws

Straighten to 6.5mm from base of bayonet ring (3)

Collimate viewing unit

Incorrect f/stop indexing

Loose set screws (9), fig. 46 Loose set screw (13)

Tighten screws Tighten screw

Buckled diaphragm blades

Dirty diaphragm blades (20) Damaged diaphragm blade (20)

Clean diaphragm blades

Replace damaged diaphragm blade



Section IV. FLASH UNIT

Reflector wont open

Defective segment cleat

Replace cleat

Reflector wont close

Segments damaged or bent cleat

Replace damaged segment or cleat

Reflector will not lock in open position

Upper segment damaged Lower segment damaged

Replace segment Replace segment

Reflector handle loose or tight in mounting bracket

Mounting bracket damaged Pressure spring damaged

Repair or replace bracket Replace pressure spring

Bayonet-base bulb will not

stay in socket

Spring broken or weak

Replace spring

Bayonet-base flash bulbs will not eject

Release spring too tight Contact spring broken

Adjust spring Replace spring

Mounting foot loose

Loose or missing screws Bottom block broken

Tighten or replace screws Replace bottom block

Flash bulb fires when inserted in socket

Connecting cord shorted Shorted resistor

Replace connecting cord Replace resistor

Flash bulb will not fire

Battery reversed Battery exhausted Connecting cord open Capacitor defective Rectifier defective

Reverse polarity Replace battery Replace connecting cord Replace capacitor Replace rectifier

Capacitor will not charge

Defective capacitor Defective resistor Battery exhausted

Replace capacitor Replace resistor Replace battery

The photographic effects of flash unit malfunctions are listed in the troubleshooting chart (par. 4-8) of the KS-15(4) Operators Manual TM 11-6720-244-12.

a. Mechanical malfunctions are generally obvious and their remedy self-evident.

b. Electrical malfunctions usually require checking with a multimeter. The procedures are outlined in paragraph 5-3c of TM 11-6720-244-12.

c. Troubleshooting Chart. MALFUNCTION PROBABLE CAUSE REMEDY




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