Control Logic CCA A3. - TM-32-5865-216-24-P0030

TM 32-5865-216-24&P

Data parity in the previous command is correct.

Tuning operation is correct.

Tunable coupler temperature is within limits.

The frequency band requested is valid.

The antenna is fully deployed.

3-6.1.3 Overtemperature. The parity line state alternates between a

logic high and a logic low at a l-MHz rate when an internal overtem-

perature condition is detected.

The control logic

3-6.2 Control Logic CCA A3. Refer to figure 3-3.

CCA status circuit consists of RF detector AR1B and invalid address

detector U9. As shown in figure FO-3, detector AR1B receives RF DET

inputs from RF monitor CCA A6 and provides an RF SENSE output to the

control logic CCA A3 logic circuit (U11C) and to decoder CCA A4. The

RF SENSE signal is low (logic O) when the RF monitor CCA detects an RF

Test point TP18 allows verification

input to RF switch assembly S2.

Invalid address decoder U9 receives a

of the RF SENSE signal.

seven-bit input from the control circuit (U16 through U19, U21B, and

U22B). When all the bits are high, the output of U9 indicates the

If any bit is low, the U9-8 out-

requested frequency band is valid.

The

put indicates the requested frequency band is out of range.

output of U9 passes to the decoder CCA status circuit.

3-6.3 RF Switch Assembly S2. Refer to figure FO-1. The RF switch

assembly status circuit consists of RF thermostat switch S3, RF

monitor CCA A6, and RFI filters FL1 through FL4. An overtemperature

circuit connects motor temperature thermostat switch S1 and RF

Filters FL1 and FL2 reduce

thermostat switch S3 to decoder CCA A4.

fluctuations in the TEMP DET input from switch S1 and the TEMP DET

output to the decoder CCA, respectively. As shown in figure FO-5,

filters FL3 and FL4 reduce fluctuation in the RF DET outputs from the

RF monitor CCA sensing network to detector AR1B in control logic CCA

A3.

3-7.

POWER DISTRIBUTION CIRCUIT.

Refer to figure 3-6. Power supply CCA Al converts the +28 V dc

input into outputs of filtered +28 and regulated +15, +5, and -5 V dc.

Table 3-5 lists the voltages accessed from the power supply CCA

test points. As shown in figure FO-6, filter L1, L2, C1, C2, C13,

and C14 provides a filtered +28 V dc output to RF relays K1 and K2,

motor control CCA A2, extender CCA A5, and stepper motor Ml. Voltage

regulator AR3 and transistor Q6 convert the filter output into +15 V

outputs to extender CCA A5 and motor control CCA A2. Chopper Q1 and

Q5 and pulse transformer T1 comprise a dc-to-dc converter that

provides +5 V outputs. Comparator AR1 monitors the voltage drop

across resistor R1 and adjusts the chopper Q1 and Q2 duty cycle to

maintain current.

Filter C9 through C11 and C15 passes the +5 V

Diode CR4 and

output to decoder CCA A4 and control logic CCA A3.

filter C6 through C8 pass the -5 V output to decoder CCA A4 and

control logic CCA A3. Voltage divider network R21 and R22 divides

the VREF output of AR3 and provides a precision reference to crowbar

circuit Q2 through Q4 and AR2.

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