Figure 46. Motor amplifier outstage, Facsimile Transceivers TT-1D/TXC-1, TT-1E/TXC-1, and TT-1F/TXC-1.
until the drum speed rises above 60 rpm (3 to 5
ac. Operation of the motors is similar in all
models of the equipment.
revolutions of the drum should be sufficient);
The motor contains a
b. Stating Circuit.
then the switch is released. Note that the ca-
pacitor winding of the start motor is in the circuit
separate starting coil in Facsimile Transceivers
T T - 1 / T X C - 1 through TT-1C/TXC-1 and a
at all times. This winding also furnishes part of
the power for the motor while it is running at
synchronous coil. The start section of the motor
is a capacitor-start induction type which operates
synchronous speed, but the major part of the
on 115-volt, 60-cps, ac. Pressing the START
power is developed by the synchronous motor,
button (START-PHASE switch S3 on Facsimile
which also controls the speed.
Because this
Transceivers TT-1D/TXC-1, TT-1E/TXC-1,
capacitor winding is in the circuit at all times,
and TT-1F/TXC-1) disconnects the synchronous
it is possible for this motor to run at a nonsyn-
motor winding and applies 115-volt ac to the
chronous speed. The operator must guard against
operating the transceiver with the motor running
start winding. This voltage is brought up from
at a nonsynchronous speed. An 1,800- or 900-
the primary terminals of power transformer T11
in the power unit through terminals 2 and 4 of
cycle tone from the motor laminations is the best
assurance that the motor is running at synchronous
the Jones plug and the contacts of the, starting
switch. The switch is held in the START position
speed.
