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 TM 55-1905-219-14-9
4-64.1. TANK LEVEL INDICATION-RECEIVER-MAINTENANCE INSTRUCTIONS
(Continued).
(7) When relay K1 is energized, the K1D contacts close connecting +17-volts dc across a charging
network made up of resistors R11, R12, and R13 and capacitor C3. When the +17-volt dc is initially applied,
the voltage at the intersection of resistors R12 and R13 rises sufficiently to bring a relay driver on the power
supply and master alarm module into conduction. A capacitor C3 charges, the voltage at the intersection of
resistors R12 and R13 drips below the cut-off level of the external relay driver. Diode CR6 steers the voltage at
the intersection of resistors R12 and R13 to the external relay driver.
(8) With relay K1 energized and the normally open K1B contacts closed, the flashing voltage at pin 17
is switched to pin 16 for connection to the HIGH LEVEL alarm lamp outside the module. When the alarm is
acknowledged by pressing the ALARM SILENCE switch on the receiver front panel, the flashing voltage at pin
17 switches to a steady state voltage that maintains the HIGH LEVEL lamp steadily lighted until relay K1 is
deenergized (the alarm condition is removed).
This task covers:
a. Inspection
c. Repair
b. Test
d. Adjustment and Alignments
INITIAL SETUP:
Test Equipment
References
NONE
Para 4-64.2 Transmitter
Equipment
Special Tools
Condition Condition Description
Para
Sound Powered Phone System
Soldering iron 25W maximum
NONE
Material/Parts
Special Environmental Conditions
NONE
NONE
Personnel Required
General Safety Instructions
2
Observe WARNINGS in procedure.
4-1336
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