Panasonic JU-475-4, Service Manual

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(1) Remove the shield plate as described in section
12.1 step (1).
(2) Disconnect the J3 connector from PCB.
(3) Draw o u t the pins the track 0 sensor assembly
from the fo llo w in g locations on the J3
c o n n e cto r: N o2,4, 6.
A t th a t tim e, draw out the pins w ith liftin g the
stopper on the connector.
(4) Remove the track 0 sensor assembly m ounting
screw and take o ut the track 0 sensor assembly.
(5) Reverse the above procedure to reinstall.
(6) A fte r reinstallation, adjust the track 0 sensor as
described in section 9.9.
12.3 Track 0 Sensor Assembly Removal and
Installation
Fig. 12-3 Track 0 Sensor Assembly Removal
12.4 Collet Assembly Removal, Installation and
A djustm ent
(1) Remove the cartridge guide assembly as
described in section 12.7.
(2) Remove the lifte r u n it as described in section
12.12
(3) Remove the collet assembly from the guide
shaft.
(4) Reverse the above procedure to reinstall.
(5) A fte r reinstallation, perform collet assembly
center adjustment.
(6) Collet assembly center adjustment.
a) Temporarily fasten the cartridge guide
assembly.
b) Insert a diskette or dummy diskette and
clamp it.
c) Clamp repeatedly a fe w times to find a
good f it between the collet and the inside
diam eter o f the drive motor.
d) Bind the screws o f the cartridge guide.
e) Check step c) again, if not good repeat step
a) through d) until the correct center
adjustm ent is achieved.
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