Table 12-4. Power Supply Output Destinations

Figure 12-7. Power Supply Functional Block Diagram

Figure 12-8. Front Panel/Chassis External Connectors

TM-11-5820-890-30-4 Ground ICOM Radio Sets: Receiver-Transmitter Radio RT-1523(C)/U (NSN 5895-01-234-8093) Manual
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TM 11-5820-890-30-4 12-5. POWER SUPPLY (19A1). Continued The power supply outputs are over-current protected. If an output is shorted to ground, the power supply will shut down. CAUTION The power supply will not be damaged if an output is shorted. However, other modules in the RCU may be damaged if this occurs. Exercise caution when troubleshooting the RCU. The power supply will also shut down if 6 V dc is applied to pin E. The other modules in the RCU use the output voltages as listed in table 12-4. Table 12-4. Power Supply Output Destinations Voltage (V dc) Destinations (module-pin) 6.75 19A2-35, 19A3-M, 19A3-X, 19A3-b, 19A6-L, 19A13J2-E 10.0 19A3-T, 19A5-P, 19A7-41 , 19A13J2-D, 19A6-W 3.0 Not Used 60.0 Not Used -10.0 19A3-Z, 19A5-V, 19A7-57, 19A13J2-A 12-6. FRONT PANEL CHASSIS (19A13). The front panel/chassis includes the front panel, backplane assembly (parent board), and frame. The controls and connectors on the front panel are used to direct the operation of the RCU. The keyboard and SIG displays provide feedback to the operator. The parent board has 12 sockets for the plug-in modules (19A1 through 19A12). it also has three connectors that mate with the front panel connectors. It provides most of the module interconnections. The terminals (E fields) are used as solder points for wires and the flexible circuits that inter- connect it to the system and chassis mounted connectors. Figure 12-8 identifies the external connectors. The frame provides physical support for the modules. The covers must be properly installed and the screws torqued to provide the required environmental protection. There is an interlock switch present on the front panel/chassis. it protects the COMSEC variables. it is connected to the COMSEC module at pin 31 through E28. if an RCU cover is removed, the switch grounds E28. This will cause the COMSEC module to zeroize the COMSEC variables. When troubleshooting an RCU with its cover removed; the interlock switch levers must be fully extended, and the COMSEC variables reloaded, to use the CT mode. 12-13

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