cec DD-8200 - 4 Troubleshooting

TROUBLESHOOTING
1. The tone arm will not automatically return.
Remove the turntable platter and check to see that the return arm lies on the ratchet BL.
pa ei Place the return arm to the correct position as shown in Fig. 12.
No: — Check to see the clearance between gear of motor shaft and ratchet is reasonable (Fig. 8).
aves:
No:
2. The tone arm returns some seconds after the end of the performance.
Loosen three screws (Fig. 3) which fasten the motor shaft, and adjust.
Rotate adjusting hexagon boit (Fig. 9) of tone arm fixing plate counter-clockwise.
Rotate adjusting hexagon bolt (Fig. 9) of tone arm fixing plate counter-clockwise.
3. The tone arm returns before the end of the performance.
Rotate adjusting hexagon bolt (Fig. 9) of tone arm fixing plate clockwise.
4. The turntable platter will not rotate even though the tone arm is above the record.
Check to see that the strobo light is ON.
Yes: Check to see that 244+2V is
available from the secondary
of the transformer.
Yes:
Check to see that 18V is eee eves
available at DC output (+) in
power printed circuit boord.
Ok: Check the microswitch.
No: Check to see that the power |
P Yes: Check the fuse.
plug is securely connected. No: Replace the fuse.
No: Connect the plug. No:
No:
Yes:
No:
5. The turntable platter will not stop rotating.
Check to see if the turntable will stop rotating when knob of microswitch is sufficiently pushed.
mt ea Adjust the clearance between the knob of microswitch and tip of tone arm fixing plate to 1 mm.
No: | Check the wiring.
No: Replace wiring according to the circuit diagram.
Yes: Check the microswitch.
No: Microswitch defective.
Yes: Capacitor defective.
6. Adjustment of turntable speed cannot be made.
* Strobo indexes appear not to stand still.
Readjust semi-fixed variable resistors referring to
TURNTABLE SPEED of ADJUSTMENTS.
+ No speed adjustments with variable resistor knob.
—~Check the wirings including the motor servo controller circuit,
: No: ‘Replace wiring according to the wiring diagrams.
Yes: Check the variable resister.
No: Variable resister defective.
Yes: Check the push switch.
[ae Push switch defective.
Yes: Motor defective.
@5
Motor defective.
Check the fuses of secondary.
OK: Power printed circuit board
defective.
No: Replace the fuse.
Check to see that proper voltage
is available at the primary of the
transformer.
Replace the microswitch,
Transformer defective.
Check the leads from the AC
circuit board to the primary
of the transformer.
(Fig. 9)