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TM 11-5820-890-30-5
CHAPTER 6
CONTROL-MONITOR C-11291/VRC
MAINTENANCE INSTRUCTIONS
Subject
Section
Page
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
6-1
Repair Parts, Special Tools, TMDE, and Support Equipment . . . . . . . . . . . . . . . . . . . . . . . II
6-10
Troubleshooting Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ill
6-10
Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV
6-45
Preparation for Storage or Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
6-49
Section I. PRINCIPLES OF OPERATION
Subject
Para
Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Control-Monitor Chassis (7A1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Microcontroller (7A2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Decoder/Timer (7A3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
Analog Module (7A4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Power Supply (7A5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
interface Faults and Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
6-1
6-3
6-3
6-5
6-6
6-8
6-8
6-10
6-1.
INTRODUCTION.
The control-monitor receives status signals and transmits control signals to one, two, or three RTs. It can also
operate in tandem with another control-monitor. ln the MAIN mode, it can monitor and change the RF, RT mode,
and CHAN of the Reselected. ln the STANDBY mode, it can monitor the RF, RT mode, and CHAN of the RT
selected. A control-monitor in STANDBY can request a change to MAIN,
Figure 6-1 is a block diagram of the control-monitor. It is made up of four modules and the chassis. They are:
Control-Monitor Panel - Case 7A1 (control-monitor chassis).
Circuit Card Assembly, Microcontroller 7A2 (microcontroller).
Circuit Card Assembly, Decoder/Timer 7A3 (decoder/timer).
Circuit Card Assembly, Analog 7A4 (analog module).
Circuit Card Assembly, Power Supply 7A5 (power supply).
The control-monitor has three connectors. Two are for the RT status and control signals. A 2880-Hz FSK carrier is
used with ones and zeros at 2560 and 3200 Hz. Normal output level is 600 mV p-p. Primary power is also supplied
from the radio to connector J1.
The third connector is for the tandem control-monitor. A 640-Hz serial digital data format is used between
control-monitors. The tandem control-monitor receives primary power at connector J3.
6-1
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