Panasonic PV-M1348, Service Manual

Page: 17 / 130

1-15
+
P2552
Unsolder
Chassis
Motor P.C.B. of
Motor Block Ass'y
Rear Side View
-
P2551
DC Power Supply
(+10VDC)
"a"
"c"
"b"
"a" "b"
DC Power Supply
(+10.0VDC)
J6005
J6004
-
+ a
b
Main C.B.A.
Motor P.C.B.
TV Main C.B.A.
Main C.B.A.
J6004
J6005
-
+
Method -2:
1. Locate the Jumper (J6004) on the Audio Amp Section of
the Main C.B.A. and cut it near the center.
Fig. 7-2
2. Apply +10.0VDC Power Supply to the jumpers. When the
Loading Posts reach the fully unloaded position, remove
the Power Supply.
Note:
Be careful not to let the DC Power Supply Unit GND contact
the chassis GND. This may damage the Loading Motor
Drive IC (IC 2501).
Be sure to apply DC + to Portion "a" of J6004.
If DC + is applied to Portion "b" of J6004, the Loading Motor
Drive IC (IC2501) may be damaged.
Fig. 7-3
3. Rewind the tape into the cassette by turning the Center
Clutch Unit counterclockwise.
4. Eject the cassette by ap10.0VDC Power Supply
again.
5. After completing the removal procedure, resolder Jumper
(J6004).
Electrical Method
Electrical method can only be performed when the mechanism
is moved by rotating the Main Cam Gear.
CAUTION:
If loading does not start in approx. 2 seconds after DC
Power Supply is applied, DO NOT continue to apply DC
Power Supply. Instead, perform "Manual Method."
Method -1:
1. Remove the solder as shown and apply +10.0 VDC Power
Supply (DC + to Portion "a," DC - to Portion "c").
2. When the Loading Posts reach the fully unloaded position,
remove the Power Supply.
Fig. 7-1
Note:
Be careful not to let the DC Power Supply Unit GND contact
the chassis GND. This may damage the Loading Motor
Drive IC (IC 2501).
Be sure to apply DC + to Portion "a" of Motor P.C.B.
If DC + is applied to Portion "b", the Loading Motor Drive IC
(IC2501) may be damaged.
3. Rewind the tape into the cassette by turning the Center
Clutch Unit counterclockwise.
4. Eject the cassette by ap10.0VDC Power Supply
again.
5. After completing the removal procedure, solder Portion "a"
and Portion "b."