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Adjustment Manual
@ MEASUREMENT AND ADJUSTMENTS
Caution
English Eee
It is very dangerous to look at or touch the laser beam.
(Laser radiation is invisible.) With the unit turned "on",
laser radiation is emitted from the pick-up lens. Be careful during adjustments in particular.
*
Perform these adjustments by use of a traverse unit base in accordnace with the traverse unit servicing method to
improve the workability.
*
In case the optical pick-up is individually replaced, it is necessary to perform mechanism adjustment before these
adjustment, refer to pages 19 ~ 32.
Traverse unit servicing method
|
*
For removal
of each part, refer to disassembly instructions.
1. Remove the cabinet and front panel.
;
2. Disconnect
connectors
(CN405
~
CN409,
CN411,
CN412
and CN501) of main P.C.B.
3. Remove
the traverse unit. The entire traverse unit can then
be removed from the unit.
,
4. Turn over the traverse unit and remove
the nuts. The tray
and the traverse unit can then be separated.
5. Remove
the disc clamper magnet from the disc clamper.
6. Temporarily
fasten
the tray and front
panel. After that,
connect only connectors (CN405, CN406, CN408)
removed
in step 2,
7. Remove
the
insulator
rubber
and optical
servo
P.C.B. of
traverse unit.
8. Mount the traverse unit on the traverse unit base.
9. Connect
connectors
(CN407,
CN409,
CN411
and CN501)
removed in step 2.
Optical servo P.C.B.
Travers
(03 P.C.B.)
unit base
Testers and Jigs for Adjustments
Testers:
.
1. Two-channel oscilloscope (with trigger) of 30 MHz or over.
2. Low frequency oscillator.
3. Digital! voltmeter.
Jigs:
1. Traverse unit base (SZZP1016F)
Ii!
4. Short leads with clip.
5. Ordinary disc.
2. Servo gain adjuster (SZZP1017F)
3. Test disc (SZZP1014F)
£
Adjustment points
® Servo gain adjuster
e 03 (Optical servo) P.C.B.
@© @osc in
GND
Focus gain adj.
Focus batance
adj.
Tracking
balance adj.
Tracking offset adj.
e 01 (Main) P.C.B.
CN804
CN803
PCK
TJ301
S 4
LSI Module
L301
d
ory
(VCO Adj.)
CLOCK
RF GND
CN5O1
CN102
ro) |
vaio] | > Sey
Focus offset
adj.
nP
VR104
Tracking
gain adj.
CN701
CN103 [|
BT101
er
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