Sansui XR Q11 Service Manual

Page 1

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Page 2

XR-QII

1. OPERATION

The XR-Qii is a computerized full automatic music selection turn-
table In which a mechanism that can automatically select any music
on a record disc at random is newly assembled into the XR-Q9.
Refer to FR-D4/D4K SERVICE MANUAL, Description of Opera-
tion", Section 2-2, for operations of the automatic mechanism
assembly and descriptions of the arm position sensor and lifter posi-
tion sensor.

The control circuits for XR-QII can mainly be divided into a servo
circuit to control a DD motor and a microcomputer and its peri-
pheral circuit to mainly control a tonearm.

Refer to XR-Q9 SERVICE MANUAL, Page 4, for operation of the
servo circuit, since the operation is entirely the same as in the
XR-Q9.

1-1. Basic circuit configuration for full automatic
operation (See Block Diagram on Page 2.)

A. Microcomputer

The microcomputer uPD-S46-150 controls the operations of the
tone arm, lifter, and DD motor in such a way that every control sig-
nal is output to the corresponding output port after each of signals
applied to the input ports has been executed in accordance with a
program stored in the microcomputer memory.

The microcomputer becomes enable only when the output ports are
at H level in potential; in other words, every circuit connected to
pins (at H level) of the microcomputer operates.

B. Input peripheral circuits for the microcomputer

1. Control switches

These are manual operation switches to perform the full automatic
operation. Since the control switches are dynamic-connected to the
ports of the microcomputer, if a control switch is pushed, two
input/output pins are connected to each other in the microcomputer
and thereby the microcomputer begins to operate. (See Block Dia-
gram.)

2. A sensor and the sensor circuit

In operation with the B sensor, the A sensor detects the tonearm
positions necessary for automatic operation. In other words, the A
sensor detects the lead-in position of a 30 cm-or i7 cm-size record
disc and also detects whether the tonearm rests on the arm rest (A
xB=i)ornot(AxBf1).

The tonearm positions (A x B = 1 and A x B # 1) have the following
relations to the start/stop switch:

0 If start/stop switch is set to start (The turntable is at a
stop)

. . Litter Operation of Antoni-tie
An" posmo" Position Turntable Oporltion
0n the rest Up (D = 1) Rotates after In-operation
(A x B = 1) 200m:

Same as above Down (C =8 1) ln-operation after

D:1inCW

0n the record disc Up ID = 1)
(A x B n I)

lmmly rotates To C = 1 in CW

Same as above Down (C '= 1)

o If start/stop switch is set to stop (The turntable is in
motion and also in automatic operation.)

, , Lifter Operation of Automltic
A" P°""° Position Turntable ommion
0n the rest Up (D =1) lmm'ly stops
(A x E = 1)
Same as above Down (C s 1)

On the record disc Up (0 =1)

Stops at point Arm return
(A x B h 1) AB

Same as above Down (C = 1) Arm return

o If start/stop switch is set to stop (The turntable is in
motion and also in automatic operation.)

Operation of

Arm Motlon Status Turntable

Automatic Operation

During up motion Out of automatic operation Imm'ly stops
(A x B = 1) at D = 1

During up motion Arm return after D = 1 Imm'ly stops at
(Axarzl) pointAB

During horizontal Imm'ly out of automatic

Imm'ly stops
motion (A x B = 1) operation

During horizontal Arm return in CCW -> CW Stops at point
motion (A x E f 1) or in CCW AB

During down motion Arm return after D = 1 Same as above

(AxBfi)

During return motion Disable

Note: in the above lists, A x B = 1, D = 1, and C :1 mean the
states in which the sensors 5, C, and D are detecting the
corresponding signals, respectively, on the timing chart. CW
means that the micromotor rotates clockwise; CCW means
that the micromotor rotates counterclockwise. Refer to the
respective sections for operations of the sensors A, B, C, and
D and the micromotor.

The signal detected by A sensor is applied to the input terminal 33
of the microcomputer through lCma and Icon,

3. 8 sensor and the sensor circuit

In cooperation with the A sensor, the B sensor detects the tonearm
position and the end detection signal in the record lead-out groove
after finishing over play.

The signal detected by the B sensor is applied to the input terminal
34 of the microcomputer through transistor 01 , and mm.

4. C sensor, D sensor and the sensor circuits

The C and D sensors comprise a lifter cam and a microswitches,
respectively. The C sensor detects the down-position of the lifter;
the D sensor detects the up-position of the lifter.

In both the sensors, the terminals 1 and 2 of the micro-switches are
shorted to each other whenever the lifter states are detected.

5. E sensor and F sensor

The E and F sensors mounted within the head shell feed Into the
microcomputer the signals necessary for automatic disc size selec-
tion and automatic music selection. In other words, in order to
Implement complex full automatic operations, both the sensor sig-
nals are fed into the computer after being discri hated into E2, E3,
F1, and F2, respectively, through appropriate circuits.

The arrangement of the D and F sensors is shown in Fig. 1-1, and E
sensor is called a leading sensor because E sensor first detects the
signal.