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TM 11-6760-238-34
CHAPTER 2
PRINCIPLES OF OPERATIONS
MECHANISM connector J3 and connector J4, are
2-1. Shutter Test Block Diagram Analysis
applied to SHUTTER ASSY TEST switch S7. Control,
(fig.* FO-1)
power, and signal voltages selected by the SHUTTER
a. Control, power, and signal voltages, from the
ASSY TEST switch S7 are processed by shutter
relay assembly under test and present at the relay as
assembly test board and components assembly A8 for
sembly connector J1, are applied to relay assembly test
controlling operation of the following lamps: Forward,
board and components assembly Al.  Control signals
center, and aft lamps, DS3 through DS5, SENSOR CAL
from assembly Al are applied to the A, B, C and D lamp
lamp DS2; 1/3000 lamp DS1; and OPER, DATA, RECY,
assembly A2. When set to the RELAY TEST position, +
and ELECT FLASH indicator lamp assembly A9.
28-volt dc power is applied to the relay assembly test
f. Bridge assembly photosensitive transistor output
board and components assembly A1.
signals are processed by the FWD, CTR, and AFT
b. Primary +28 volts dc and 115 volts ac, 400 Hz
variable resistor controls R1, R2, and R3 and applied
power are applied through power connector J2, fuses Fl
through FOCAL PLANE SHUTTER switch S8 to shutter
and F2 to POWER switch S1. 115-volt ac power from
assembly test board and components assembly A8.
switch S1 is applied to power transformer T1 and control
Here, the signals are amplified and then applied through
panel test board and components assembly A4 Positive
SHUTTER ASSY TEST switch S7 to SCOPE + B,
28 volts dc power from switch S1, is applied to the DC
SCOPE + A, COUNTER START and COUNTER STOP
POWER lamp and also throughout the test panel as
binding posts J12, J10, J8 and J9 respectively.
needed. Power transformer T1 supplies ac power to the
g. When depressed, SHUTTER TRIP switch S5
AC POWER lamp, throughout the test panel as needed,
apphes + 28 volts dc power to SHUTTER connector J5
and also panel illuminating 5 volts ac power to the
and also to the shutter assembly test board and
externally connected aircraft camera control system
components assembly A8.
(ACCS) master control under test.
h.  When depressed, SLIT WIDTH switch S6
c.  Control panel test board and components
applies + 28 volts dc and ground to SHUTTER
assembly A4 accepts control and signal voltages from
MECHANISM connector J3 and connector J4.
the ACCS master control under test through CONTROL
i.
Shutter assembly variable resistors  are
PANEL connector J6.  In addition, it produced output
connected through SHUTTER MECHANISM connector
control signals required to illuminate various lamps
J3 and connector J4 to RC BRIDGE + and - binding
located within indicator lamp assemblies A6 and A7.
posts J16, J17 to permit resistance readings with an
Output signals from assembly A4 also control operation
externally connected bridge.
of the 900 indicator lamp assembly A5, and indicator
lamp assembly A7, as well as provide 115 volts 400 Hz
2-2. Shutter Test Set Circuit Analysis
power, converter E V/H (+28 volts dc and ready indicate
The shutter test set tests all cycling functions and shutter
+ 28 volts dc power through CONTROL PANEL
speeds of Camera, Still Picture KA-76A. It also isolates
connector J6 to the ACCS master control.  When
malfunctions and provides calibration capabilities for
OPERATE switch S2 is depressed, operate fail + 28
Control, Master, Aircraft Camera LA-405A. The shutter
volts dc is applied through CONTROL PANEL connector
test set consists of: (a) Relay assembly test board and
J6 to the ACCS master control under test.
component assembly A1; (b) Control panel test board
d. Various dc voltages, E V/H to system analog
and components assembly A4; (c) Shutter assembly test
volt age and E input voltage are applied through
board and components assembly A8; (d) Bridge
CONTROL PANEL connector J6 to CONTROL PANEL
assembly A10; (e) Indicator lamps DS1 through DS5,
TEST switch S4.
Selected output voltage from
indicator lamp assemblies A2, A3, A5, A6, A7, and A9,
CONTROL PANEL TEST switch S4 is then applied
and (f) Associated switches and controls.
through MASTER switch S3 to VOLTMETER + and -
NOTE
binding posts J14 and J15, respectively for monitoring
Only major subassemblies of the shutter test set such
purposes.
as: Shutter assembly test board and components
e.  Control, power, and signal voltages in the
assembly A8, control panel test.
shutter assembly under test, present at SHUTTER
2-1

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