Hitachi DA-5000 - Page 9

(3)
(1]
Precaution in replacing parts.
Protective sheets are stuck to the service parts of the
unit mechanism. Never remove these sheets prior to
the completion of assembly.
If the lead terminals of the slide motor are overheated
due to soldering etc., it may cause a fault in the slide
motor. Therefore, be sure to unsolder the leads on the
P.W.B. side during replacement.
When installing the unit mechanism, apply one drop of
alcohole to the grommets to facilitate unit mechanism
installation.
Fully tighten the screws. If the screws are loose, the
disc tracking performance may be degraded. (Fig. 13)
When installing the DC motor assembly, take care not
to damage the worm gear.
After installation, check the play between the worm
gear and feed gear. If there is no play move the DC mo-
tor assembly outward. (Fig. 14)
When replacing the DC motor (disc motor), turntable,
coil spring, taper ring or TR stopper, proceed as follows.
1) Remove the turntable fixing screw (hex. hole set
screw). Apply the soldering iron to the turntable fix-
ing screw hole for about 1 minute and pull out the
coil spring and tapering tray stopper in the direction
of arrow A (vertical to the unit plate).
2) When installing the turntable, adjust its height with
the height adjusting jig. At this time, take care not to
apply excessive force to the DC motor shaft.
HITACHI DA-5000
3} When replacing the DC motor, take care not to ap-
ply excessive force in the direction of arrow B.
Doing so may deform unit palte C, resulting in deter-
iorated eye pattern. (Fig. 16)
A) Press in the TR stopper into the DC motor shaft so
that the shaft tip is aligned with the TR stopper tip.
(Fig. 17)
Note:
Once the TR stopper is removed, do not reuse it.
[6] How to check the feed bar (Fig. 18)
When the feed bar is loose, the disc tracking perfor-
mance may be degraded. Check that the feed bar does
not move in the direction of arrow D.
If the feed bar moves in the direction of arrow D, bend
the bar plate B in the direction of arrow E with pliers.
As the flexible P.W.B. is liable to be damaged, take care
not to apply excessive force when replacing the unit
mechanism.
[7]
12. Checking the actuator
Check the resistance values of the actuator coils.
They are normal if the resistance values meet the follow-
ing values.
Focus coil: 30 ohms
Tracking coil: 10 ohms
If any coil is open or short circuited, the actuator may be
defective. Check that the lens moves with 15V battery.
(Fig. 19)
Loading
mechanism
Lademechanismus
Mécanisme de
chargement
Connector @)
Stecker @
Connecteur ©
Connectors
Stecker
Cormnecteurs
Claw of tray
Klaue der Schublade
Cliquet du plateau
Glissiére
Tray
Schublade
Plateau
OQ)
em
Fig. 4
Abb. 4