Motor Power and Protective Ground Connections

TM 11-5815-206-12/ TO 31W4-2PGC1-61

f. Keyboard Lock. If messages

are to be

transmitted from the teletypewriter,

loosen the

locknut (fig. 2-5), slide the keyboard

lock toward

the front of the teletypewriter, and

tighten the

locknut.

2-7. Motor Power and Protective Ground

Connections

a. Motor Power Connection. Connect the TT-

4(*)TG motor power cord {fig. 1-10) to a source of

1 0 5 - to 125-volt dc or ac (50- to 60-Hz single-

phase) power Connect the motor power cord of the

TT-335T/TG to a source of 108- to 132-volt, 396- to

404 cps. single phase, ac power Connect the motor

1-7) of the TT-537/G to the

p o w e r cable fig.

mating connector on the computer source of 105-

to 125-volt, 396- to 404-cps. single-phase,

(para 2-3c). Connect the power cord of the TT-

698(*)/TG

(fig. 1-10) to a source of 105- to 125-

volt ac (50- to 60Hz, single-phase) power.

Figure 2-3. Platen lock (TT-537/G).

b. Protective Ground Connection. Connect the

braided metal pigtail on the plug of the motor

d. Carriage Lock, (TT-4(*)/TG, TT-335/TG and

power cord to a suitable ground connection point

TT-698(*)/TG (fig. 1-9). The carriage lock is used

( (1) and (2) below).

to lock the type-bar carriage in the extreme left-

(1) When installing the teletypewriter in an

hand position during transporation. To unfasten

aircraft or on a vessel, connect the pigtail to a

the carriage lock, loosen the wingnut on the left-

metal structural member of the aircraft or vessel.

hand end of the carriage rail, turn the lock until it

(2) If the teletypewriter is to be installed at a

hangs downward from the rail, and tighten the

ground communication site, connect the pigtail to

wingnut.

a water pipe or other similar low-resistance ground

e. Carriage Lock

(TT-537/G)

(fig. 2-4). The

(5 or 6 feet ground rod). Use a length of field wire

carriage lock is used to lock the type bar carriage

or any available wire of equal or heavier gage. If a

in the extreme left-hand position during trans-

suitable ground connection point is not available,

portation. To unfasten the carriage lock, open the

u s e one or more ground rods to obtain a low-

access window and reach under the left side of

resistance ground connection point, The ground

the access opening to disengage the carriage lock.

rod (or rods) may be located as far as 1,000 yards

Push the carriage lock lever of the rear to unlock

from the teletypewriter. Select a low. damp site,

the carriage. Close the access window.

preferably a spot where the soil is clay or loamy.

Figure 2-4. Carriage lock (TT-537/G)

2-5