TM 11-6720-242-35
d. Troubleshooting Magazine.
Item
Malfunction
Probable Cause
Corrective Action
1
Film does not take up
a. Broken belt
a. Replace belt (para4-49).
b. Film guides bent, binding
b. Replace bent film guide on
film against pressure
pressure roller assembly
plate.
2
Film frame is short, less than
a. Improper timing
a. Check alinement of camera
11.4 inches
body assemblies
b. Improper film threading .
b. Thread magazine properly
c. Defective magazine brake
Check brake and replace, if
necessary
d. Defective magazine clutch
d. Check clutch and replace, if
necessary
e. Magazine pressure roller
e. Check pressure roller assembly
assembly
and replace, if necessary
f. Adas pressure plate set
f. Check and reset adjustment of
out of tolerance.
pressure roller, if necessary
3
Film resolution is less than
a. Magazine keeper block
a. Check installation of keeper
25 lines
assembly
block assembly and replace if
necessary
(para 341).
b. Leaf spring exhausted
b. Replace leaf spring.
c. Magazine improperly
c. Check for foreign matter, burs,
seated on
or
camera body.
damage to mating surfaces.
4
Banding within negative
a. Magazine pressure roller
a. Check installation and smooth
frame.
assembly
frame.
operation of pressure roller
assembly (para 3-42) and re-
place, if necessary.
b. Magazine keeper
b. Check installation of keeper
assembly
block assembly (para 341) and
replace if necessary
c. Improper threading
c.. Thread magazine properly.
(TM 11-6720-242-12).
d. Defective magazine brake
d. Check brake and replace, if
necessary (para 4-50).
e. Defective magazine clutch
e. Check clutch and replace, if
necessary (para 4-52).
5
Scratches on film
Surfaces of magazine film
Replace defective film guide
guides that touch film) are
(para 4-80).
not smooth
4-5. Signal Substitution Tests
a. Testing + 22 Volts Dc Regulated and
IMC Circuits.
Use of the fabricated test fixtures described in
(1) Insert the interface board assembly into the
connector of the special test fixture shown in figure 4-1,
signal substitution tests contained in paragraphs 4-6
set test switch S1 to on to connect + 28 volts de to the +
22 volts dc regulator circuit.
4-1 through 4-5.
(2) Connect the voltmeter across pin 1 and pin 5
4-6. Testing Interface Board Assembly Circuits
and check for a reading of 21.52.0 volts dc. Then set
test switch S3 to on and again check for a reading of
NOTE
21.5+2.0 volts de.
(3) Reconnect the voltmeter to pin 15 and pin 5.
When the designated value or
With switch S3 on, check for a reading that is less than
condition of a test is not obtained,
1.5 volts. Set test switch S8 to off.
remove the interface board from the
(4) With the voltmeter still connected to pin 15
test
fixture,
then
check
the
and pin 56, check for a reading of 21.52.5 volts de.
malfunctioning circuit with the help
(5) Set test switch S1 to off.
of figure 2-12, to isolate the faulty
part or assembly for replacement.
Change 1 4-5
TM 11-6720-242-35
