Sanyo GCD 2000 Service Manual page 6

CD MECHANISM DESCRIPTION
2. Drive Control of DISC TABLE & PICKUP Mechanism
I
SW2 ON I
CCW: Counter Clock Wise CW : Clock
INPUT+
%"0
.FNO
b
1
2==
No. DETECT
NO
YES
PAST AT 70mSEC
NO
YES
*
+
YES
MOTOR CCW
-0
RETURN
}
MOVEMENT DIRECTION
OF SENSOR
1.
2.
3.
4.
5.
Unless 10 msec. < tl, the microprocessor is not able to detect it.
(a). If the turntable is rotating too slowly (t2 >70 msec.), or
(b). if the turntable is rotating too quickly (tl < 10 msec., the turntable will continue to turn (it will not stop rotating).
If, after the slit for the last
disc number (@ in illustration) has passed, the next slit is not encountered for more than
70 msec., the next slit is detected and used as the stop position.
If the turntable is rotating too slowly (t2 > 70 msec.), the slits between @– and @ ~~ ~e-mistaken for stop positions.
,...
The base mechanism will rise at these positions and bump into the turntable.
When the base mechanism is rising or lowering, the motor stops when switch 3 is not on if 16 sec.. have passed.
Malfunction.
When the base mechanism is rising or lowering, the next disc is selected or switch 3 turns on 4 times when switch
is not on if 16 sec.. have not passed.
The control keys have no effect when the base mechanism is rising or lowering.
Action of CD Mechanism
1 ) DISC SKIP
-._.
.. .-
37
21
-5-
Figure 1
2
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