Dual 601 - Stroboscope

•
•
8. Setting
of nominal speed
To bring stop disk into center
position
turn adjustment knob correspondingly.
(The nose of the stop disk should show
to the motor pulley center).
Adjust nominal speed by turning adjusting
nut (108) counterclockwise the speed is
reduced. When turning lt clockwise the
speed
is increased.
St roboscope
Accurate setting of the platter speed
33 1/3 rpm can
be checked during play
with
the aid of the
stroboscope device.
When the
platter (4) is rotating at exactly
33 1/3 rpm the lines of the stroboscope ap—
pear to stand still. If the lines of the
stroboscope move in the direction of rota—
tion of the platter, the platter speed is
too high. If the lines move backwards,
the
platter is rotating more slowly than the no—
minal
speed.
Adjustment is carried out with
the "pitch"
knob
(10).
To change the stroboscope slacken machine
screws (241), move stroboscope housing
(243)
to "50" or
"60" (Hz) and retighten screws.
After removing the housing top (238) the
glow lamp (239) can be
changed. In the case
of glowlamps with red spot ensure that the
red spot
(anode)
faces the C 1 capacitor.
tor.
Defeet
After switching the unit on
the glow lamp
(239) of the stroboscope does not come on.
•
Cause
a) Clou
lamp (239) defective
b) Power supply
interrupted
Remedy
a) Renew glow
lamp (239). In the case of
glow lamps with red spot,
ensure that
the red
spot (anode) faces the C 1
capacitor.
b) Check connections at power pack, check
components.
Fig. 7
Motor
field
connections
(with
voltage
selector)
110-125V
220-240V
Fig.
5
Fig. 6
Fig.
8
Stroboscope
(wiring
diagram)
Circuit
board
(output
stages)
5