Test
Requirement
Requirement
Test
Set power line voltage at
6. Motor action:
Voltages measured from
6. LINE binding post balance:
100 volts ac. Depress
RECORD PHOTO posi-
each binding post to
TRANSMIT position.
S T A R T button until
tion.
g r o u n d differ by no
DB METER at +2 db.
motor speed is slightly
Drum-engaging lever dis-
more than 1 db.
600-ohm load resistor
engaged from lead
above synchronous
across binding posts.
screw.
speed, then release but-
Voltage measured across
7. RADIO XMTR jack out-
ton. Motor should lock
Note. I n F a c s i m i l e T r a n s -
100-ohm load resistor:
into 100-ohm load:
into synchronous speed
ceivers
TT-1D/TXC-1,
TT-1E/
maximum, .44 volt ac;
TRANSMIT position.
TXC-1, and TT-1F/TXC-1, the
an average of four times
minimum, .36 volt ac.
DB METER at +2 db.
rector action requirement should
out of five. After several
be performed at 30 rpm as well as
trials, depress PHASE
at 60 rpm.
button while motor is
b. Receiving. Make the following tests with
running.
Primary
the transceiver operating as a receiver:
clutch should stop with-
out stopping motor. If
Requirement
Test
primary clutch does not
rotate when PHASE
DB METER gives no in-
1. Fork beat:
button is released and
dication of signal.
FORK PHOTO position.
motor is running, rotate
GAIN at 100.
top of drum manually
No connections to input
toward front panel about
circuits.
one-half inch, and re-
DB METER reading:
2. LINE JACK input .0035
lease. If clutch tension
maximum, +4 db; min-
volt ac, 1,800 cycles:
is too tight or motor
imum, +1 db.
current is too low, motor
Recorder lamp current
RECORD PHOTO posi-
will stall. Repeat above
measured on dc milli-
tion.
tests with power-line
ammeter in series with
GAIN at 100.
voltage at 115 to 130
lamp: maximum, 33 ma;
volts ac.
minimum, 28 ma.
Stylus
should
contact
7. RECORD DIRECT:
DB METER readings:
3. LINE binding post input
drum and continuously
RECORD PHOTO posi-
maximum, +1 db; min-
.0035 volt ac, 1,800 cycles:
record at least a dark
tion.
imum, -1 db.
gray.
DB METER at +2 db.
RECORD PHOTO posi-
LINE JACK input ap-
tion.
proximately .005 volt
GAIN at 100.
ac, 1,800 cycles.
Connect ground lead of
4. LINE binding post input
Fasten sheet of Tele-
signal generator to REC.
balance to REC. C. T.,
deltos paper to drum.
C. T. post and hot side
.0035 volt ac, 1,800 cycles:
Start motor.
each
a l t e r n a t e l y to
RECORD PHOTO posi-
Engage drum to lead
LINE binding post.
tion.
screw.
Difference in two read-
GAIN at 100.
Turn selector switch to
i n g s on DB METER
R E C O R D DIRECT.
should not exceed 1 db.
DB METER reading:
5. RADIO RCVR jack input
maximum, +5 db; min-
.14 volt ac, 1,800 cycles:
imum, +2 db.
RECORD PHOTO posi-
tion.
GAIN at 100.
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