Teac TN-400 - Operation; Electro-Touch Control Center; Adjusting the Speed

Stroboscopie indicator
Four bands of marks are imprinted around
the platter. These are illuminated by two
neon lamps and the image is reflected to the
viewing window by a mirror system. The
upper two trains are for 45 rpm, with the
lower two for 33 1/3 rpm. Each speed
group has a thicker band for 50 Hz and a
thinner band for 60 Hz. Only the trains that
correspond with your AC power line
frequency should be used,
Note: Speed adjustment is not always
essential for general operation; this feature
is provided for the critical listener to assure
the highest cossible accuracy.
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Notice: In dry climates or when the relative
Operation
Connect the AC power cord to the mains
outlet.
Depress the POWER switch to ON,
Stroboscope lamps and the STOP lamp will
illuminate.
‘Lightly touch the 33 or 45 Selector
Control as appropriate. Lamp for the con-
trol selected will illuminate and the platter
will begin rotation.
Check the stroboscopic Speed Indicator.
If the band of marks for the established
speed does not seem to be moving the
turntable speed is accurate. If it is moving or
drifting, adjust for accuracy as explained
below.
ELECTRO-TOUCH CONTROL CENTER
Start/Speed and STOP switches.
Lightly touching the “33” or “45” control
Starts rotation at the selected speed. The
ball of the finger must bridge both anodes
of a control. These “‘switches’’ will not
move. Lamps indicate the selected speed.
Note: The high inertial mass of the platter
prevents it from quickly slowing down to
stop. Upon touching the STOP control, the
lamp will illuminate, but the platter will
normally take several moments to slow to a
stop.
humidity is very low, one might experience
a moderate static-electricity discharge when
touching the switches or other metal parts
of the turntable. This results from the
grounded condition of the chassis and is
quite normal, not a fault in the TN-400.
Adjusting the speed
While the turntable is rotating, check the
train for the speed selected. At the exact
rotation speed, the marks in the band will
appear to be stationary. If they are moving
or drifting, the rotation speed can be cor-
rected as follows:
Using the speed control knob for the
selected speed (33 or 45), turn the knob
clockwise (towards the -) if the strobe train
is moving forward; counterclockwise (to-
wards the +) if the marks are moving back-
wards. Move the knob slowly to allow time
for the turntable to correct its speed.
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Note: The reference used for reading the
Stroboscope is the 50 or 60 Hz power line
frequency. While usually extremely stable,
that reference has been known to vary up’
to 0.2%. Such variations will not effect the
speed of the motor, but they might cause
the Stroboscopic Indicator to deviate
slightly. Such periodic deviations should be
assumed to be from the power line varia-
tions, causing changes in the lighting.