TM 11-338 Telephone Central Office Set TC-10, 1944-07-28 TABLE OF CONTENTS Paragraph Page SECTION I. Description. General 1 1 Component parts 2 1 Switchboard BD-110-( ) 3 7 Frame FM-19 4 10 Power equipment 5 11 Test and power distribution equipment 6 15 II. Installation and operation. General 7 17 Setting up equipment 8 17 Connecting equipment 9 23 Preparation for use 10 28 Operation of power equipment 11 29 Switchboard operation 12 29 III. Functioning of parts. General 13 33 Tracing line and trunk circuits 14 40 Line protection and cross-connection circuit 15 42 Line circuit, common battery 16 47 Line circuit, magneto 17 63 Trunk circuit, universal two-way to dial or manual offices 18 63 Universal cord circuit 19 66 Ringing circuit 20 69 Operator's telephone circuit 21 70 Auxiliary operator's telephone circuit 22 71 Conference circuit 23 75 Dial cord circuit 24 76 Cabinet BE-72 test circuits 25 76 Night alarm circuit 26 77 Fuse alarm circuit 27 79 No-voltage alarm circuit 28 79 Panel BD-90 power and ringing circuits 29 79 IV. Maintenance. General 30 82 Testing with Cabinet BE-72 31 83 Moistureproofing and fungiproofing 32 92 Wiring diagrams 33 98 Storage batteries 34 98 Switchboard plugs, cleaning 35 99 Switchboard cord repairs 36 99 Cleaning contacts 37 100 Cleaning relay parts 38 101 Drop and relay adjustments 39 101 Circuit requirements of relays 40 105 Telering 20-cycle power ringer 41 111 Battery-driven ringing interrupter 42 111 V. Supplementary data. Packing for transportation 43 112 Maintenance parts lists 44 116 LIST OF ILLUSTRATIONS Fig. No. Title Page 1 Telephone Central Office Set TC-10, assembled x 2 Switchboard BD-110-( ), front view 4 3 Switchboard BD-110-( ), rear view, terminal panel raised 5 4 Switchboard BD-110-( ), packed for transportation 6 5 Line side of main distributing frame consisting of three Frames FM-19 bolted together 8 6 Switchboard side of main distributing frame consisting of three Frames FM-19 bolted together 9 7 Rectifier RA-36-J mounted on Rack FM-30, front view 10 8 Panel BD-90, front view 11 9 Panel BD-90, rear view 12 10 Cabinet BE-75 mounted on Rack FM-30 13 11 Cabinet BE-72, front view 14 12 Test Cabinet BE-70-( ), front view 16 13 Cording diagram for Telephone Central Office Set TC-10 18 14 Suggested floor plan for Telephone Central Office Set TC-10 in one room 19 15 Suggested floor plan for Telephone Central Office Set TC-10 in two rooms 20 16 Distributing frame, assembly diagram 21 17 Switchboard BD-110-( ), rear view 22 18 Cabinet BE-72, showing method of connecting spade terminals to binding posts 24 19 Three-conductor plug and jack 33 20 Switchboard BD- 110-( ), front equipment 34 21 Switchboard BD-110-( ), keyshelf equipment 35 22 Multiple scheme, one- and two-position installations, Switchboard BD-110-( ) 37 23 Multiple scheme, three-position installations, Switchboard BD-110— ( ) 38 24 Switchboard BD-110-( ), cabling scheme for one- and two-position installations 39 25 Switchboard BD-110-( ), cabling scheme for three-position installations 41 26 Switchboard BD-110-( ), cabling scheme for four-, five-, and six-position installations 42 27 Switchboard BD-110-( ), answering jack and multiple umbering; one-, two-, and three-position installations 43 28 Switchboard BD-110-( ), answering jack and multiple numbering; four-, five-, and six-position installations 44 29 Switchboard BD-110-( ), binding posts on terminal panel 45 30 Multiple cable terminal strips at top of Switchboard BD-110-( ) 46 31 Switchboard BD-110-( ), spade terminal strip desig- nations 47 32 Frame FM-19, line circuit, wiring diagram 48 33 Common-battery line circuit, wiring diagram, Switchboard BD-110-( ) 49 34 Magneto line circuit, wiring diagram, Switchboard BD-110-( ) 62 35 Universal trunk circuit, schematic diagram, Switchboard BD-110-( ) 64 36 Universal cord circuit, schematic diagram, Switchboard BD-110-( ) 67 37 Ringing circuit, schematic diagram, Switchboard BD-110-( ) 70 38 Operator's telephone circuit, schematic diagram, Switch- board BD-110-( ) 72 39 Grouping circuit, functional diagram, Switchboard BD-110-( ) 73 40 Auxiliary operator's telephone circuit, wiring diagram, Switchboard BD-110-( ) 74 41 Conference circuit, wiring diagram, Switchboard BD-110-( ) 75 42 Switchboard BD-110-( ), dial cord circuit, schematic diagram 76 43 Night alarm circuit, schematic diagram, Panel BD-90 78 44 Fuse alarm circuit, schematic diagram, Panel BD-90 79 45 No- voltage alarm circuit, schematic diagram, Panel BD-90. 79 46 Panel BD-90, power and ringing supply circuits, schematic diagram 80 47 Cabinet BE-72, voltmeter test circuit, schematic diagram 83 48 Cabinet BE-72, switchboard test circuit, schematic diagram 86 49 Test of contacts of common-battery line jacks, Switchboard BD-110-( ), functional diagram 88 50 Test of magneto line circuit drops, Switchboard BD-110-( ), functional diagram 88 51 Test of supervisory relay, Switchboard BD-110-( ), functional diagram 89 52 Test of sleeve and supervisory relays, Switchboard BD-110-( ), functional diagram 90 53 Operate test of sleeve relay, Switchboard BD-110-( ), functional diagram 90 54 Ringing key test, Switchboard BD-110-( ), functional diagram 91 55 Nonclick test of TALK-RING key, Switchboard BD-110-( ), functional diagram 91 56 Method of adjusting spring tang of an E- or R-type relay 102 57 Front contact make adjustment of a G-type relay 103 58 Racks FM-34, FM-35, FM-36, and FM-37 in Case CS-61 112 59 Frames FM-19 in Cases CS-59, covers removed, showing two stages of packing 113 60 Cabinet BE-72 in Case CS-66, cover removed 114 61 Switchboard BD-110-( ), front panel removed, showing cords secured for transportation 115 62 Power distribution circuits, wiring diagram, Cabinet BE-72 138 63 Voltmeter test circuit, wiring diagram, Cabinet BE-72 139 64 Switchboard test circuit, wiring diagram, Cabinet BE-72 140 65 Cabinet BE-75, wiring diagram 141 66 No-voltage alarm circuit, wiring diagram, Panel BD-90 142 67 Power and ringing circuits and interrupter contact protection circuit, wiring diagram, Panel BD-90 143 68 Night alarm and fuse alarm circuits, wiring diagram, Panel BD-90 144 69 Power cable connector circuit, wiring diagram, Switchboard BD-110-( ) 145 70 Dial cord circuit, wiring diagram, Switchboard BD-110-( ) 146 71 Power and heating circuit, wiring diagram, Switchboard BD-110-( ) 146 72 Universal cord circuit and ringing circuit, wiring diagram, Switchboard BD-110-( ) 147 73 Operator's telephone circuit, wiring diagram, Switchboard BD-110-( ) 148 74 Universal two-way trunk circuit, wiring diagram, Switchboard BD-110-( ) 149 DESTRUCTION NOTICE WHY — To prevent the enemy from using or salvaging this equipment for his benefit. WHEN — When ordered by your commander. HOW — 1 Smash — Use sledges, axes, handaxes, pickaxes, hammers, crowbars, heavy tools. 2. Cut — Use axes, handaxes, machetes. 3. Burn — Use gasoline, kerosene, oil, flame throwers, incendiary grenades. 4. Explosives — Use firearms, grenades, TNT. 5. Disposal — Bury in slit trenches, fox holes, other holes. Throw in streams. Scatter. USE ANYTHING IMMEDIATELY AVAILABLE FOR DESTRUCTION OF THIS EQUIPMENT. WHAT — 1 Smash — Jack field, switchboard plugs, storage battery, battery charger, power generator, ringing generators, keys, relays, meters, receptacles, dial, etc. 2. Cut — All cables and wires. 3. Burn — Wood cases and cabinets, cables, wire, technical manual, blueprints. 4. Bury or scatter — Any or all of the above pieces after breaking.

"TM 11-338."

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