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Record drop
According to centre hole diameter (7 or 38 mm) either inter-
changeable spindle AW 3 or automatic spindle AS 12 are intended
for stacking and dropping records.
The record drop is initiated by the cam wheel 145 whose drop
cam surface (AK) controls the release rocker (AW) and the changer
actuator rod. (Fig. 18).
The resultant downward movement initiates record drop via the
changing spindle or automatic spindles.
Muting switch
To prevent disturbing noises during automatic operation of the
tonearm the unit is fitted with a muting switch. Control of the
switch springs for both channels is effected by the cam wheel.
With the unit in neutral state, the muting of the pick-up leads is
eliminated (Fig. 14)
Adjustment
In zero position of 'the cam there should be a clearance of ap-
proximately 0.5 mm between the contact springs (F) and the
shorting strips (L). If necessary the shorting strips should be bent
The contacts should be sprayed with a suitable cleaning agent.
Shut-off and change cycle
The dog (M) on the turntable platter gear (PR) and the shut-off
lever (A) actuate both the change cycle at the end of the record
as well as the shut-off after the last record in a stack is played.
At the end of a record, the tonearm moves towards the centre at
an accelerated rate dueto the increased pitch of the grooves. This
motion carries the shut-off lever (A) towards the dog by means
of the shut-off slide 161. The eccentric dog pushes the shut-off
lever (A) back at each revolution as long as the tonearm advance
is only one normal record groove (Fig. 19 a). The run-out groove
with its steeper pitch moves the shut-off lever (A) against the
dog with greater force, engaging the shut-off lever (A) and causing
the main cam wheel 145 to be driven out of its neutral position
by the turntable platter gear (Fig. 19 b).
Shut-off mechanism
Shut-off and change functions are determined by the position of
the cam follower lever (U). After every start or record drop the
cam follower lever is brought to its stop position by the main
lever 198. ( Longer end towards the centre of the main cam). As
the record is dropped the cam follower lever (U) is turned to its
Defect
Cause
After operating the
lever the tonearm
does not set down
or sets down too fast.
Rated speed is at
the limit of pitch
adjustment.
•
Damping is too great
or too slight due to
dirt in the silicon oil
of the lift tube
inexact positioning
of the belt pulley.
start position by the cam rocker, so that the tonearm can swing
in towards the record and be lowered onto it. If there are no
more records on the spindle, the cam rocker remains locked in
its lower position and cannot turn the cam follower lever so that
the lever remains in its stop position and allows the tonearm to
swing to its rest position (Fig. 15).
When the main cam wheel 145 returns to its neutral position,
the pulley 150 of the switch arm 176 drops into a cutout in
the main cam, opening the power switch.
Adjustment
Tonearm set-down point
After removing the notched plate 69 (by pressing lt forward and
lifting the rear edge first) the adjustment screw (A) is accessible.
The stylus set-down point can be varied towards the centre or
the outside by turning the adjustment screw to the right or left
respectively (Fig. 16).
Svvitch oft position
With the tonearm on the tonearm rest, the eccentric (B) can be
adjusted to alter the switch-off position (shut-off range record
116 to 122 mm). The eccentric is accessible through the hole in
the supporting back plate. If the unit switches off too early or
not at all, then the eccentric (B) should be turned to the right or
left respectively (Fig. 17).
Release rocker
The lift of the change actuator rod may be changed by bending
the release rocker. The change actuator rod is correctly adjusted
if, with the cam 145 in zero position, and the change spindle
locked in position, the three supports of the change spindle per-
mit a longitudinal movement of 0.2 mm when the change
actuator rod is pressed upwards (Fig. 18).
Tonearm vertical lift
The adjustable sleeve 192 is used to adjust the tonearm vertical
lift (for automatic operation). Pull out the mains plug, unlock
the tonearm, turn the cam wheel 145 from its zero position
until the tonearm reaches its highest point of travel. The tone-
arm should now be approximately 5 mm above the tonearm rest
stop (see Fig. 19). Adjust by means of sleeve 192.
Repair
Remove the lift plate assembly 190. Remove the control stud
191. Remove the lock washer 87. Unscrew the adjustment
sleeve 192. Remove the locking washer 87. Remove the lifting
bolt 194 and the pressure spring 193. Clean the lift tube and
lifting bolt. Coat the lifting bolt at the same time with "Wacker
Siliconöl AK 300 000".
Reassemble the parts.
By rotating the regulating button 25 bring the belt pulley 112
into its central position. (The lug of the belt pulley should be
visible in the centre of the drive pulley). Adjust the rated speed
with the hexagonal screw 111. Turning the hexagonal screw 111
clockwise increases the rated speed. Turning the hexagonal screw
anti-clockwise reduces the rated speed.
11
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