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Scope display malfunction. (See figures for scope traces for properly tuned associated radio receivers)
Up
TM-11-5805-387-20-2 Modem Radion Teletypewriter MD-522A/RC (NSN
Next
Section V. MAINTENANCE PROCEDURES
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

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