Pc Board Replacement; Main Pc Board; Output Pc Board - Mitsubishi Electric DD-8020 Service Manual

1-2. PC Board Replacement

1-2-1. Main PC Board

Note:
• Before removing the main PC board (4), be sure to
short-circuit the laser diode output land.
After replacing, open the land as it was after inserting
the flexible cables (1).
1. Remove the top cover. (Refer to item 1-1-1.)
2. Remove six flexible cables (1) and remove one
connector (2).
3. Remove four screws (3).
4. Remove the main PC board (4).
Note:
• When mounting, be sure to twist the wire for the
connector (2) several times.
Twist more than 7 times.
Flexible cables (1)
Main
PC board (4)
Pickup head
Laser diode
output lands
Type A
Fig. 2-1-9
Connector (2)
Flexible
cables (1)
Screws (3)
Flexible
cables (1)
Pickup head
Laser diode
output lands
Type B
2-4

1-2-2. Output PC board

1. Peel off the tape (1).
2. Remove the connector (2).
3. Disconnect two flexible cables (3).
4. Remove three screws (4).
5. Remove five screws (5) and remove the output PC
board (6).
Note:
• When mounting, be sure to twist the wire for the
connectors (2) several times.
Twist more than 9 times.
Tape (1)
Connector (2)
Fig. 2-1-10
Screws (4)
Output
PC board (6)
Screws (5)
Flexible cables (3)