Dual 1010 - Operating the switch button (78 b) to Start actuates the Stop cycle; No playback. Muting switch fails to open; Stop switching; Muting switch

On reaching the shut-off groove, the tonearm automatically
returns to its rest position and the unit shuts off (see shut-off
mechanism). However, should the tonearm be lifted off
manually and returned to the tonearm rest, the tabs (LS) of
the arm segment (170) release the latch (179). The tension
spring (181) then returns the switch arm (125) to its initial
position, opening the line switch and disengaging the drive
wheel.
Stop switching
Placing the switch button in “Stop” position moves the switch
lever (212) and switch spring (UF) towards the main cam,
as in the start cycle, but only half as far. This causes the
main cam to push the cam follower lever (143) to the side,
into its stop position.
Muting switch
A muting switch (163) is provided to prevent change cycle
noises from being picked up by the tonearm cartridge. The
switch springs (S) for both channels are actuated by the
main cam (140). In rest position, the muting switch opens.
Trouble shooting:
Symptom Cause
Fig. 11
Operating controls
78b
Remedy
Operating the switch button (78 b)
to “Start” actuates the “Stop“
cycle
Operating the switch button (78 b)
to “Stop” actuates the “Start“
cycle
Placing the switch button in
“Manual" causes turntable to stop
Noises picked up by phono
cartridge during the change cycle
No playback. Muting switch fails
to open
Tension on switch spring (UF)
too low, so that cam follower
lever (143) is not guided into
its change position
Tension on switch spring (UF)
too high, so that cam follower
lever (143) is guided back to
the start position after the stop
switching
Switch lever assembly out of
adjustment
Muting switch out of
adjustment. The space
between the switch springs (S)
and muting contacts is too
large
Muting switch contacts
touching
Bend switch spring (UF).
Check spring position by placing the switch button
in “Stop” and rotation main cam back. The rear
stud of the cam follower lever (143) should only
just touch the switch spring.
Bend switch spring (UF).
Check spring position by placing the switch button
in “Stop“ and rotating the main cam back. The
rear stud of the cam follower lever (143) should
only just touch the switch spring.
Re-adjust set screw (208) so that the latch (179)
overtravels the support (BG) by about 1/44" in
“Manual” position. Lock the set screw (208) in
position with lock nut.
Bend the switch springs (S) so that in the null
position of the main cam (140) the distance between
the switch spring (S) and the contact (K) is
about VWe4".
Bend switcn springs (S) so that in the null position
of the main cam (140) the distance between the
spring (S) and contact (K) is about 1/44".