Control relays K1 and K2.

TM 11-6760-238-34

A10 consists of three phototransistor and amplifier

plied through diode CR24 to the DATA lamp thus lighting

assemblies A1 through A3 mounted m a column Two

the lamp

(5) Control relays K1 and K2. Control relays

razor blades, positioned in close proximity to each

phototransistor assembly, establish the aperture (0.0115

K1, K2 and diodes CR16 and CR17 in conjunction with

+ 0.001 inch) which admits light onto the phototransistor

lay K1 and diode CR1 (located on the chassis), function,

Bridge assembly photosensitive transistor output signals

to control application of the + 28-volt dc pulse power to

are processed by the FWD, CTR, and AFT variable

the shutter mechanism assembly for tripping the shutter

resistor controls R1, R2 and R3 and applied through

curtain mechanism When depressed, SHUTTER TRIP

FOCAL PLANE SHUTTER switch S8 to shutter

switch S5 applies + 28 volts dc to pin D of SHUTTER

assembly test board and components assembly A8.

connector J5, through pins A2 and A3 relay K2 to pin X1

Here, the signals are amplified and then applied through

of relay K1 causing it to energize When relay K1 is

SHUTTER ASSY TEST switch S7 to SCOPE + B,

energized +28 volts dc is applied pins C and L of

SCOPE + A, COUNTER START and COUNTER STOP

SHUTTER MECHANISM connect J3.

d. Bridge Assembly A10 (fig 2-2) Bridge assembly

binding posts J12, J10, J8 and J9 respectively.

2-5