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Testers and jigs for adjustments
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enue
2. Ordinary disc and test disc (SZZP1014F)
3. Hexagonal wrenches .(1.27mm and 2 mm)
Top view of feeler blade gauge
(SZZP1020F)
Caution
It is very dangerous to look at or touch the laser beam.
(Laser radiation is invisible.)
REST position gauge (SZZP1019F)
With the unit turned
''on"', laser radiation
is emitted from the
pick-up lens.
Be careful during adjustments in particular.
Grating adjustment too!
(SZZP1018F)
Adjustment Procedure
(H.H.S./D.H.W./etc., regulation).
*
These steps must be followed in order.
1. Rest position adjustment
. Assure
that leaf switches
$101
(Rest detection) and
$102
(End detection)
have
not been mashed
during
reassembly and therefore set to "ON".
If they are, carefully separate the contacts about 2 mm.
2. Apply power to the unit.
This will cause the traverse
motor to wind the optical pick-up to the REST position.
. Turn the power switch "OFF".
. Place the REST position gauge on the turntable.
5. Assure that the lens is concentric within the hole of the
REST position gauge as shown in Fig. B.
Lock screw
REST switch
Pw
Optical pick-up is too close to the
turntable.
(Fig. B)
To adjust:
1. Loosen the lock screw and turn
the REST switch adjustor clock-
Focus lens
wise.
2. Note that if the Rest detection
switch
($101)
is
too
much
REST position
toward $102, then the pick-up
nase
will Rest too far away from the
Fig.B
"NG" (too close)
turntable at Rest position.
If so, apply power and repeat step 1 above until
Rest detection is detected when the lens is connectric with the hole of the REST
position gauge.
Fig. A
No adjustment required (Fig. C)
Optical pick-up is too far from the
turntable.
(Fig. D)
To adjust:
Loosen
the
lock
screw
and
turn
the
Rest switch adjustor counter-
REST position
=
gauge
REST position
6. To verify correct adjustment, place the disc on the turntable and apply power to the unit. This will auto cycle the
optical pick-up.
Re-check alignment with the REST position gauge as shown in Fig. C.
Focus lens
Focus lens
2. Turntable height adjustment
Note:
Necessary
after
Direct
Drive
spindle
motor
is
replaced or RF signal is not obtained.
1. Disable focus search by pull out the shorting pins of
CN103 on 03 P.C.B.
2. Insert the thin end of Feeler blade gauge between the
turntable and the shaft bearing.
3. Slide
the
Feeler
blade
gauge
toward
the thick
end
and
mark
the gauge with a pencil, where
it and the
turntable
touch
and until
the blade
can
not be fed
anymore than remove the gauge.
4. Connect
the
oscilloscope
to
TJ402
pin 01
(Main)
P.C.B.
5. Place a disc on the turntable and clamp
it with the
magnet.
6. Apply power to the unit.
7. Press eject 'out' and eject "IN".
8. Confirm
if RF signal is present.
!f not, proceed to the
next step.
9. To confirm:
Gently tap the disc at point 'A'.
If RF signal appears,
the turntable is too low.
If RF signal does not appear,
tap the disc at point ""B"'.
RF signal should appear
indicating that the turntable
is too high.
10. To adjust:
(1) Insert the
Feeler
blade gauge
between
the turntable
and the shaft bearing to the previously marked point.
(2) Loosen
the hexagonal
screw
of turntable
set screw.
(Use a hexagonal wrench 1.27 mm)
(3) If the turntable is too low, slide the Feeler blade gauge
about 4 mm (5/32'') towards the thick end and remove
felier blade gauge.
Reapply power and check for RF signal.
(This is a ''trial and error'' adjustment, several attempts
may be required to obtain RF signal).
(4) If the turntable
is too
high, insert the Feeler blade
gauge and move about 4 mm (5/32'') towards the thin
end, using the same method as in step 3.
(5) Reconnect shorting pins to enable focus search.
2a
Turntable
Optical pick-up
Top view of disc set up
Hexagonal screw
Turntable
———
Insert the feeler
blade gauge
Shaft bearing
CLidlleLili
Lidia
Lecieid
Front view of traverse unit
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