No voice reception

TM 11-5805-387-20-2

Table 2-2 TROUBLESHOOTING - Continued

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

7. No voice reception

Step 1. Be sure receiver module A4 is securely seated in a corrosion-free socket.

See malfunction 4.

Step 2. Check for loose or damaged SPEAKER + REMOTE or MICROPHONE cables.

Be sure that associated connectors are clean and fit tightly. If cables are shorted

or have open conductors, replace them.

Step 3. Use Multimeter AN/URM-105 to check switch S4E for bad contacts. (See

malfunction 2 for location of S4.)

If contacts are bad, higher category of maintenance required.

8. No voice transmission; teletypewriter (tty) normal

Step 1. Check for loose or damaged AUXILIARY, SPEAKER + REMOTE or MICROPHONE

cables.

Be sure that associated connectors are clean and fit tightly. If cables are shorted

or have open conductors, replace them.

Step 2. Use Muitimeter AN/URM-105 to check switch S4B or S4C for bad contacts. (See

malfunction 2 for location of S4.)

If contacts are bad, higher category of maintenance required.

9. No tty transmission; voice normal

Use Multimeter AN/URM-105 to check switch S4D for bad contacts. (See malfunction 2

for location of S4.)

If contacts are bad, higher category of maintenance required.

10. No tty or voice transmission

Be sure transistor module A3 is securely seated in a corrosion-free socket.

CHASSIS INTERIOR, TOP VIEW

Remove module A3 from its socket and visually check for any rust or corrosion.

Remove corrosion by lightly sanding with fine sandpaper. Securely seat module

A3 back in its socket.

2-19