TM 11-5840-281-12-1
4-40.
RECEIVER-TRANSMITTER LOW VOLTAGE POWER SUPPLY REPLACEMENT. (CONT)
REMOVAL
1.
Open transmitter door.
2.
Loosen eight spring-loaded screws (1) on transmitter control panel (2) and open panel.
3.
Loosen four spring-loaded screws (3) on remote switching control (4) and open control.
4.
Remove four screws (5), lockwashers (6), and flat washers (7) on designation plate (8).
5.
Remove spacer (9) and designation plate (8) from terminal board TB 1 (10).
6.
Tag and remove all wires on left side of terminal board TB 1 (10).
7.
Remove four bolts (11) and flat washers (12) from low-voltage power supply (13).
8.
Remove low-voltage power supply (13).
REPLACEMENT
1.
Place low-voltage power supply (13) into mounting position.
2.
Install four bolts (11) and flat washers (12) to secure low-voltage power supply (13).
3.
Connect the corresponding wires on left side of terminal board TB 1 (10).
4.
Place spacer (9) between designation plate (8) and terminal board TB 1 (10).
5.
Using four screws (5), lockwashers (6), and flat washers (7), secure designation plate (8).
6.
Close remote switching control (4) and, using four spring-loaded screws (3), secure.
7.
Close transmitter control panel (2) and, using eight spring-loaded screws (1), secure.
8.
Close transmitter door and lock.
9.
Turn on power.
4-41.
RECEIVER-TRANSMITTER POWER SUPPLY ADJUSTMENT.
Set up multimeter to measure voltages specified in the following table. Adjust voltage level as necessary by adjusting
indicated control. If adjustments cannot be accomplished, or if unadjustable voltages are not within tolerances indicated,
refer to a higher category of maintenance.
PRELIMINARY PROCEDURE: Place SCAN switch on receiver-transmitter main power panel to OFF position.
MULTIMETER TEST LEAD CONNECTION
POSITIVE LEAD
NEGATIVE LEAD
LOCATION
CONTROL
INDICATION
+ 28 V J141
LVPS COM
Transmitter Control
Not Adjustable
+28 + 4 V
Panel
+ 12 V J140
LVPS COM
Transmitter Control
Not Adjustable
+12 + 0.6 V
Panel
LVPS COM
- 19 V J137
Transmitter Control
Not Adjustable
-19 + 1.5 V
Panel
LVPS COM
- 6 V J138
Transmitter Control
Not Adjustable
-6 + 0.3V
Panel
GND 5304
VOLTAGE MON
Local Control
R3427-35 ADJ on
- 35 V
J5303
Monitor and Place
35V Voltage
MONITOR Switch to
Regulator Card
- 35V Position
4-139
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