TM 5-6665-202-13
NOTE: TAG AND DISCONNECT ELECTRICAL LEADS AS NECESSARY.
NOTE: REMOVE WASHER AND PREFORMED PACKING FROM HEADER AFTER REMOVAL OF BUSHING.
Figure 5-1. Headset, removal and installation.
Table 5-1. Modules Point-to-Point Test- Continued
Table 5-1. Modules Point-to-Point Test
At Input Error Amplifier Module (White)
Terminal No.
5
AC signal going to receiver coil.
Terminal No.
AC ground.
6
AC signal connects input amplifier.
9
3
Output of X control DC voltage (variable-1.25 to 0
Ground.
8
volts depending on position of X control.
11 & 12
Output of input amplifier and is AC and DC
1&2
Output ofinput amplifier,two voltages AC and DC-
component.
DC voltage, same as that at pin no. 3
11
Ground
5
Input to the A1 amplifier AC signal.
A3 Output Amplifier Module (Yellow with Black Stripe)
AC Ground.
7
R Control feedback voltage AC signal.
10
DC end AC voltages.
6
-6.3 Volts regulated DC.
AC Feed back loop. It determines gain of output
3
4
10 Volts unregulated DC or whatever battery
amplifier.
voltage is.
Input voltage from battery.
9
12
Output to output amplifier. The signel will be lower
Output to earphone AC signal.
5
than that at pins 1 and 2 AC signal.
4
Ground
7
Regulated 6.2 volts DC.
NOTE
2
Unregulated 10 volts DC same as battery voltage
safety diode which preventa damage in case
Pins 1 and 2 have an AC and DC voltage. DC
batteries are installed improperly.
voltage should be equal to that of DC voltage at
DC output to X control -1.26 volts approximately.
8
pin 3. Pin 5 and 10 is where phase detecting is
A4 Oscillator Module (Red)
accomplished.
7
Regulatad -6.3 volts DC.
At Variometer Module (Black)
5
Ground
10 volts unregulated DC actual 9.6 (You have a loss
6
because voltage has passed thru the protective
2
Approximately AC ground (.25 OHMS) one side of
diode).
driving voltage for oscillator.
2 & 10
One of the outputs from oscillator (in phase) 250 to
1
90 degrees Out of phase signal used for phase
360 millivolts.
detection.
12
Output (90 degrees out of phase) AC signal 126 to
7
6.2 volts DC regulated.
3
175 millivolts (voltages taken at a null
One side of phase adjusting resistor in variometer.
condition).
4
Other side of phase adjusting resistor in variometer
end return path to ground.
Change 2 5-3
