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Maintenance Turn On Procedure
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TM-11-5825-270-23 Monitor Radio Frequency R-2176/FRN (NSN
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Table 4-3. Monitor Receiver Troubleshooting


TM 11-5825-270-23
Table 4-2 Maintenance Turn-On Procedure-Continued
Step
Procedure
Observation
Corrective Action
9
During the keying sequence turn
After the delay set by TIME DE-
a.
If the delay is wrong refer to
SENSITIVITY control A3R7 (fig. 2-1)
LAY control A2R32 the NORM
counterclockwise to reduce the
indicator will be off, the ALARM
b.
If the receiver does not alarm
CARRIER LEVEL meter reading
indicator will be on, the aural
to the setting of CARRIER control
alarm will sound, and the remote
c.
If there is no aural alarm refer
A2R22 (fig. 2-1) plus 1 dB.
alarm will be on.
d.
If there is no remote alarm refer
e.
If the NORM and ALARM in-
dicators are both off refer to
10
During the keying sequence turn
a. CARRIER LEVEL meter will
a.
SENSITIVITY control A3R7
read 0 dB 1 dB.
clockwise until the receiver reverts
b. NORM indicator will be on and
b. If both indicators are off refer
back to normal operation.
ALARM indicator will be off.
NORM indicator is off and
ALARM indicator is on refer to
c. Aural alarm will be off.
d. Remote alarm will be off
11
Adjust SENSITIVITY control
None.
None.
A3R7 for a CARRIER LEVEL
meter reading of 0 dB.
Table 4-3. Monitor Receiver Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
INDICATING FUSE LIGHTED
Step 1. Replace the fuse.
a. If the indicating fuse is off go to table 4-2 and complete the maintenance turn on procedure.
b. If indicating fuse is on go to step 2.
Step 2. Disconnect the ac input at J2. Visually inspect the wiring at TB1 of the power supply, at transformer T3 and at fuse F1.
Replace the fuse and go to step 3.
Step 3. Disconnect the leads at TB1 of the power supply. Use the multimeter to check for de isolation from ground for the leads
from TB1-1, TB-3, TB-4, TB1-5, and TB-6.
a. If there is dc isolation go to step 4.
b. If there is no dc isolation for the leads from TB1-1 and TB1-3 check the wiring associated with TB 1-1 and TB 1-3
(fig. FO-3). Disconnect the if. amplifier PCB, rf PCB and audio amplifier PCB from their connectors to isolate the
short to either the wiring harness or a PCB (fig. FO-3).
c. If there is no dc isolation for the lead from TB-4 replace capacitor C2.
d. If there is no dc isolation for the leads from TB1-5 and TB1-6 replace transformer T3. This procedure requires
direct support maintenance personnel (refer to chapter 5).
Step 4. Check for a short between TB1-2 and TB1-5 and between TB1-2 and TB1-6 of the power supply.
a. If there is no short go to step 5.
b. If there is a short replace power supply assembly A4 para 4-17).
Step 5. Check for dc isolation from ground for terminals 1, 2, 3, and 4 of transformer T3.
a. If there is dc isolation go to step 6.
b. If there is no dc isolation replace transformer T3. This procedure requires direct support maintenance personnel
(refer to chapter 5).
Step 6. Check the resistance of the primary windings of transformer T3; between terminals 1 and 2 and between terminals 3 and
4. The resistance will be about 25 ohms.
a. If resistance is correct go to step 7.
b. If resistance is zero replace transformer T3. This procedure requires direct support maintenance personnel (refer
Step 7. Check for dc isolation between primary and secondary windings of transformer T3 (between terminals 1 and 5).
a. If there is isolation go to step 8.
b. If there is no dc isolation replace transformer T3. This procedure requires direct support maintenance personnel
(refer to chapter 5).
4-3


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