TM 11-6720-239-35
Symptom
Corrections
Probable trouble
Incorrect focusing ____________________
Lens not properly focused _____________ Collimate lens (para 4-7).
Defective rangefinder mechanism in
Refer to finder assembly troubleshooting
finder assembly.
chart (para 2-7).
c. Flashgun Troubleshooting Chart.
Symptom
Probable trouble
Corrections
Open flash circuit . . . ------------------
Dirty or corroded battery contacts ______
Clean battery contacts (para 3-10).
Resolder defective connection.
Broken or cold-soldered connection -----
Defective or broken flash connector plug. Replace flash connector plug.
Defective flashbulb socket . . . . . . . . . . . . . Replace flashbulb socket.
after the visual inspection and preliminary
corrective measures have been completed, perform
a. General. If the shutter is performing errati-
the complete operational test given in paragraph
tally, make a complete visual inspection (para.
and to correct minor faults. If the trouble persists
after performing the operation test.
b. Shutter Assembly Troubleshooting Chart.
Symptom
Probable trouble
Corrections
Both blades close together on all
a. Rust or foreign matter on magnet,
a. Clean or replace dirty or rusted com-
FILM SPEED dial settings.
ponents (para 3-10).
keeper or blades.
b. Magnet and keeper misaligned ------
b. Adjust magnet to realign it with the
keeper (para 3-19).
c. Bent cocking latch pin _____________
c. Straighten pin or replace cocking latch
d. Switch S1 or S2 out of adjustment---
e. Photocell V1 shorted. -.. ___________
3-20).
f. Open switch S1 ____________________
g, Open circuit between white battery
g. String a jumper wire between the affected
contact and S1 contact or between
contacts.
S1 contact and magnet coil.
h. Open or defective magnet coil -------
i. Open circuit between bottom magnet
i. String jumper wires between affected
contacts.
contact and Q2 collector or
between top magnet contact and
positive (+) photocell contact.
j. Open circuit between screw side of
j. String jumper wire between affected con-
switch S2 and common contact of
tacts.
switch S6 or between S2 breaker
and R6-R2 common point.
k. Defective transistor Q1 or Q2 -------
k. Replace Q2.
l. Defective variable resistor R1
l. Replace R1 or R3.
potentiometer R3.
Closing blade stays open on all speeds--- a. Timing switch S2 out of adjust-
ment.
b. Second blade spring disengaged ------
b. Reattach spring to blade.
c. Defective transistor Q1 or shorted
c. Replace transistor Q1 or capacitor C1
capacitor C1.
d. Open or cold-soldered Resistor R6
d. Resolder or replace resistor R6 or R2.
or R2.
e. Defective potentiometer R3 ---------
e. Replace potentiometer R3.
f. Open circuit between Q1 emitter
f. String jumper wire between affected con-
and R3 wiper or Q1 collector and
tacts.
resistor R1 or between resistor
R1 and photocell V1.
