Luxman PD-375 - Transistor Explanations and Muting Circuit; Explanation of Transistors; Muting Circuit and Timing

PD-375
EXPLANATION ABOUT TRANSISTOR’S
Q 10 280945
When the rotation started by depressing the "Start/Cut" button after the suction
by V.D.S. button, this transistor works to cancel the set signal to FLIP-FLOP
circuit of " V.D.S. on ".
---This prevents the mis-suction when the suction operates again once already
sucked.
Q 171 280945
When the mode is set at " REPEAT ", the reset signal comes into the V.D.S. off
FLIP-FLOP circuit. While the V.D.S. motor is rotating, this transistor operates
to cancel this very reset signal until the motor stops rotating by the reset
Signal coming from SW-07 at the main cam.
---When the mode is set at " REPEAT " while V.D.S. motor is rotating, no problem
to activate "V.D.S. on ". But when the "V.D.S. off " is depressed, V.D.S.
motor stops rotating on the way, and the platter is locked. This transistor was
adopted to avoid this trouble.
While the reset signal of V.D.S. off FLIP-FLOP circuit is to delete memory of V.D.S.
off.
Q 12 250945
This works to cancel DC 12V fed into V.D.S. switch at the "REPEAT" mode.
---This transistor is used so that the V.D.S. on/off switch should not operate at
" REPEAT " mode.
Q 13-1 28C945
This operates to cancel not the set signal to be fed to V.D.S. off FLIP-FLOP
circuit but the set signal to V.D.S. on FLIP-FLOP circuit except in the case that
the tonearm is put on the arm rest position by the tonearm position detecting
switch 09.
Q 13-2 280945
This operate to cancel the output coming from " V.D.S. on/off " FLIP-FLOP circuit
so that the V.D.S. motor should not rotate except when the tonearm is at the arm
rest by the tonearm detector switch 09.
While when the " V.D.S. off " FLIP-FLOP circuit is set on, the V.D.S. operation
starts after the tonearm get back to arm rest position.
---This transistor is adopted so that the platter should not be mechanically locked
even if "V.D.S. on/off " button is switched on while playing.
Q 14 280945
When the tonearm left from the arm rest, the output of V.D.S. on/off FLIP/FLOP
circuit is cancelled by Q 13-2. While the tonearm is placed at the arm rest, V.D.S.
operation starts, and even if the tonearm left the arm rest before the V.D.S.
operation completes, this transistor works to cancel this blocking signal until the
V.D.S. operation is achived.
MUTING
CIRCUIT
(CANCEL
CIRCUIT)
MUTING
CIRCUIT
TIMING
CHART
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