Dual CS 650 RC Service Manual

mputer board
(equipment side)
2
e microcomputer boards have been fitted into
h serial numbers up to 16 000. If servicing is
the microcomputer board COP 420
Art.-No.
)r these
units.
K
0— i 1 -0 0 73
3 OH HO
0 I>
Fig.
7
Silent
circuit
(equipment
side)
Kurzschließer
Short Circuiter
Court.circuiteur
, nei5f
c
.12V ,
Fig.
8 Solenoid Connection
plate
(equipment
side)
e h
LED- Stroboscop
9
cl
D 9100
D 9102
=1
2
3
4
9104
1
7
I
V
/
Solenoid
Solenoid Solenoid
Start
Stop
Lift
Fig.
5 Fuse plate
(equipment
side)
CS 650
RC Discription of
Functions
The automatic HiFi record
player CS 650 RC is a remote con-
trollable turntable with front controls.
The power is supplied by means of a mains transformer and a
power supply board. The turntable is switched to "stand-by"
mode by operating the
"power" switch.
D 900 and C
9402 on the
power
supply board provide a DC
voltage of 30 V for the infrared receiver.
The 21 V DC voltage isgenerated by means of thediodes D 9401-
9402 and C 9403. The direct drive motor, the stand-by LED, the
selenoids, the
stroboscope LEDs and IC 9400 are supplied with
this voltage.
The IC operating voltage of 5 V is stabilized by
means of IC 9400. In addition to the
voltage supplies, the sole-
noid driver transistors T 9400—T 9405 are accommodated on
the
power supply
board.
The
microcomputer board is linked to the power supply board
by means of a
connector strip.
Operation of the touch buttons
for the functions "start, I ift and
stop" acts upon the inputs of the
microprocessor. Via resistors,
/hese three inputs
become active "H". The corresponding input
is set to "L" by
operating a button. The microprocessor sets the
corresponding
output to "H".
The transistors T 9400, 9401 and 9402 are blocked via the in-
verter, the transistor T 9403, 9404 or 9405 becomes
conductive
and the command is executed by means of
the solenoid.
The infrared signal
is fed in via the capacitor C 9305. The
operating voltage for the infrared
receiver is stabilized to 18 V
with
the Zener diode D
9302.
The active duration of the commands start,
lift and stop is fixed
in the microprocessor and
amounts to approximately 1.3 sec.
During this time, the
"muting" output of the processor
receives
active "L"; via the inverter, signal
"H" reaches the base of T
9151
which
activates the relay and thus shorts the
two audio channels.
The stand-by LED is
activated via the resistor R
9408.
If the
motor is switched on, signal "H"
reaches the base of tran-
sistor T
9408,
via R
9419 and R 9420, which becomes conductive
and which switches
off the LED. The same
signal reaches the
microprocessor
via the voltage
divider R 9421 and R
9422. This
signal
controls the
microprocessor in such a way that
the "stop"
function is only performed
when the motor is
running.
9
4
6
3
5
10
18
3
ly
it
is
he
th
th
•so ,
6

Dual CS 650 RC Specifications

General

Brand	Dual
Model	CS 650 RC
Category	Turntable
Language	English