Panasonic SC-AK48, Service Manual

Page: 31 / 104

9 Checking Procedure for Self-operation of Cassette
Mechanism Ass’y
•
This procedure describes simple methods independent of mechanism controller or governor circuit.
9.1. Operation Check Providing with Cassette Tape
1. Push up the EJECT lever with rubber band.(Refer to Fig. 2)
2. Apply DC 5V to the MOTOR. (MOTOR will be rotated) (Refer to Fig. 1)
3. Provide the cassette tape with mechanism ass’y.
4. Apply DC 9V to the plunger, and then operate it by switching power ON/OFF. (Power: +PL, -PL) (Refer to Fig. 1)
a. FWD PLAY : Supply power to the plunger momentary. (Duration: approx. 50msec.)
b. FWD FF : At FWD PLAY mode, supply power to the plunger momentary. (Duration: approx. 50msec.)
c.
STOP : At FWD FF mode, supply power to the plunger momentary. (Duration: approx. 50msec.)
d. REV PLAY : At STOP mode, supply power to the plunger for ordinary duration. (Duration: approx. 200msec.)
e. REV REW : At REV PLAY mode, supply power to the plunger momentary. (Duration: approx. 50msec.)
f. STOP : At REV REW mode, supply power to the plunger momentary. (Duration: approx. 50msec.)
Repeat the above operation to FWD PLAY mode.
Note: Incorrect duration for power supply may be operated to other mode.
9.1.1. Connection Diagram Between the Mechanism Ass’y and Power Supply
(MOTOR and Plunger)
Fig. 1
9.1.2. Detail View of EJECT Lever
(EJECT lever fixed by rubber band, Plunger rib operation)
Fig. 2
9.2. Operation Check Not Provided with Cassette Tape
1. Push up the EJECT lever with rubber band. (Refer to Fig. 2)
2. Apply DC 5V to the MOTOR. (MOTOR will be rotated)
3. Lift up the plunger rib of mechanism ass’y with the tip of minus screwdriver, and then operate it same as power supply duration.
(Refer to Fig. 3)
Note: Operation order is same as the “Operation Check Providing with Cassette Tape” item 4. above.
Fig. 3
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SA-AK48