Yamaha GX-900 Service Manual page 14

GX-900
Disassembly of MD Mechanism Unit
Remove the MD mechanical unit according to Steps 1 ~ 6 of the disassembly procedure (page 7).
Removal of MD Main P.C.B. (Fig. 16)
1. Remove 4 screws (Q1).
2. Remove 6 connectors (Q2).
(*1) After pulling off the flexible P.C.B.
for the optical pickup from the
connector, cover its end with
aluminum foil or the like which is
electrically conductive so as to prevent
the optical pickup from being
damaged by static electricity.
Removal of MD Mechanism (Fig.17)
1. Remove 4 screws (R1).
Almost the entire surface of the cartridge holder is
coated with oil. When removing the mechanism, hold it
at the rear end (where marked with arrows in the figure)
and avoid touching the oiled surface.
Cartridge Holder
Gray
(R1)x4
ø1.7x8.9mm
13
( Q1 ) x 4
1.7 x 3mm
Flexible P.C.B. for
optical pickup (*1)
(Q2)x1
Caution
MD Mechanism
Black
Gray
Fig. 17
( Q2 ) x 1
MD Main P.C.B.
( Q2 ) x 1
( Q2 ) x 3
Frame
Fig. 16
Removal of Magnetic Head (Fig.18)
1. Remove a screw (A1).
Caution
a. When removing the magnetic head, hold its base and
do not touch the magnetic head itself or the leaf
spring.
b. Place the magnetic head upside down.
c. Use special care so as not to cause any damage to
the magnetic head when installing it.
Leaf Spring
MD Mechanism
(A1)x1
ø1.7x5mm
Magnetic Head
Sheet, Head
Fig. 18