TM-5-5420-202-10

LAUNCHER, M48A5 TANK CHASSIS

OPERATOR'S MANUAL

DECEMBER 2009

TM-5-5420-202-10 - Page 161 of 535

0022

TM 5-5420-202-10

Communication System

NOTE

• Operation of amplif er AM-1780/VRC and operation of intercom sets are contained in

these work packages.

• Refer to TM 11-5820-498-12 for operation of radio sets AN/VRC-53 and AN/VRC-64.

• Refer to TM 11-5820-401-10-2 for operation of radio set AN/VRC-46.

• Refer to TM 11-5915-224-14 for operation of transient suppressor MX-7778A/GRC.

• Notify f eld maintenance for removal and installation of radio sets.

Amplif er AM-1780/VRC

1. Set MASTER BATTERY switch (Figure 1, Item 1) to ON.

Figure 1.

Master Battery Switch.

2. Set MAIN PWR switch (Figure 2, Item 1) to NORM.

3. Set POWER CKT BKR (Figure 2, Item 4) to ON. POWER indicator (Figure 2, Item 5) will light.

CAUTION

If POWER CKT BKR (Figure 2, Item 4) trips to OFF after reset, move MAIN PWR switch

(Figure 2, Item 1) to OFF to prevent damage to amplif er. Notify f eld maintenance.

4. If POWER CKT BKR (Figure 2, Item 4) trips to OFF, reset to ON.

5. Move INT ACCENT switch (Figure 2, Item 2) to ON or OFF.

NOTE

INT ACCENT (Figure 2, Item 2) OFF: Intercom and radio sound levels are equal. INT

ACCENT ON: Radio sound level is lower than intercom.

6. Set RADIO TRANS switch (Figure 2, Item 3) to CDR + CREW, CDR ONLY, or LISTENING SILENCE.

7. Turn off amplif er by moving MAIN PWR switch (Figure 2, Item 1) to OFF.

0022-2

AUXILIARY EQUIPMENT