TM-9-2350-273-BD
M48/M60 SERIES TANK, COMBAT FULL-TRACKED 105-MM GUN
TECHNICAL MANUAL; OPERATORS, ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; BATTLEFIELD DAMAGE ASSESSMENT AND REPAIR
TM-9-2350-273-BD - Page 163 of 288
TM 9-2350-273-BD
COMMUNICATIONS SYSTEM
Detailed Assessment Steps (Cont'd)
a.
If the problem no longer exists,
replace the defective CVC helmet or
connecting cable.
b.
If the problem has not been corrected, go to step 3.
3.
Disconnect CX-4723 cable leading to the non-operational control box at the AM-
1780, and switch it with another CX-4723 cable at the AM-1780 receptacles.
If the same problem occurs in the control box now connected to that
receptacle, repair or replace the AM-1780.
b.
If the problem stays with the same control box, go to step 4.
4.
Switch the CX-4723 cables back to their original positions on the AM-1780, and
replace the non-operational control box with a known operational control box.
a.
If the problem no longer exists, replace or repair the control box.
b.
If the problem still exists, replace or repair the CX-4723 cable between the
control box and the AM- 1780.
5.
If the cable and/or the control box cannot be repaired or replaced, install the field
expedient intercom described in para. 11-22.
11-8.
OBSERVABLE SYMPTOM: RADIO AND/OR INTERCOM ARE NOT WORKING
PROPERLY
Detailed Assessment Steps:
1. If the radio is working properly but the intercom is not working properly, refer to
para. 11-6 and/or 11-8.
2.
Make sure the control settings on the AM- 1780 are correct.
3.
Make sure the switches on all control boxes are set to ALL.
4.
Set all switches on all CVC helmets to the LISTEN or center position.
5*
Check CVC helmets and connecting cables in turn by substituting a known
operational CVC helmet and connecting cable at each control box.
a.
If the problem no longer exists,
replace or repair the CVC helmet or
connecting cable using standard maintenance procedures.
b.
If the problem still exists, go to step 6.
11-8
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