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<CD SECTION>
Caution:
lt 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 pickup lens.
Avoid exposure to the laser beam, especially when performing adjustments.
@ PREPARATION
1. Remove the CD UNIT by following the disassembly instructions in Ref. No. 6 in REMOVAL OF THE CD UNIT.
2. Remove the disc holder by following the disassembly instructions in Ref. No. 18 in REMOVAL OF THE DISC HOLDER.
Test disk
Disk holder
3. Connect the extension cable for the
4. Temporarily engage the CD UNIT
6. Insert the test disk in the disk holder.
CD UNIT.
with the two claws on the chassis.
5. Bend the extension cable so that
excessive pressure is not exerted to
the CD P.C.B. connector.
@ SETTING THE VR TEMPORARILY
FOCUS
iarea
Be
1c
BES
TRACKING
EYE
BALANCE
VR701
[vR702 |
paroa) ares) = Tracking FOCUS
Rotating VR704 more than necessary stops the rotation of the turntable
during focus gain adjustment. In this case, set the VR to its initial position and
then resume the adjustment procedure. If you cannot determine the initial
position, search for the position where the VR starts rotating by turning the VR
slowly clockwise or counterclockwise from the mechanical center (arrows in
the left figure) and then resume the adjustment procedure.
elf the VRs are fully rotated or replaced, set them to their initial position. If you
do not know their initial position, set them to their center position and then
OFFSET
GAIN
GAIN
;
resume the adjustment procedure.
™@ CONNECTING THE SERVO GAIN ADJUSTER
.
:
@ CONNECTING THE
(Tracking focus gain and tracking balance adjustment)
Audio-frequency Oscillator
OSCILLOSCOPE
Power Supp!
©0000
(Mechanical adjustment and adjustment
($zzP1 seit
@ Voltage Selector
zs
of the best eye, focus offset and tracking
offset)
aC/0C POWER,
SUPPLY 15,
POWER
O
Cy)
Servo Gain Adjuster
(SZZP1017F)
GNO OSC
@---4\@-;
Ht
Oscillator Connection
Conversion
Oscilloscope
Terminals
Connector
(SZZP1032F)
E39 °
° ©,
a
Not Connect
TP701 TP703 TP705
(V-REF) (+)
(+)
GND
|
CD P.C.B.
(Rear Side)
Se,
Do not connect to the ground on
&: CD P.C.B. Otherwise, the
)
Power
Switch
Oscilloscope
Connection
Terminals
P.C.B. Otherwise, the V-REF and chassis will
oe
not connect to the ground on the CD
be short-circuited.
V-REF and chassis will be
short-circuited.
|
CP705
;
1. Short circuit the test points with lead wires.
2. Use V-REF (TP701) only for grounding for the adjustment of the CD.
-55-
Measuring Instruments and Special Tools
Servo gain adjuster (SZZP1017F or SZZP1094C)
eTest discs
1. Playability test disc (SZZP1054C
or SZZP1014F)
2. Uneven test disc (SZZP1056C)
3. Black band test disc (SZZP1057C)
@Normal disc
eDual-beam oscilloscope with bandwidth of 30 MHz or better
(with EXT trigger and 1:1 probe).
eAudio frequency (AF) osillator
eConversion connector (SZZP1032F)
eAllen wrench
(M2.0)
(1) vg iaiealecihs ADJUSTMENT
Oscilloscope setting:
VOLT
SWEEP
Input coupling
. Leave the player in Play mode and place it as shown
in the figure on the right.
. Alternately
adjust
the
two
mechanical
adjusting
screws with the 2.0 mm allen wrench until the RF
signal amplitude
variation
on the oscilloscope
is
minimized.
. After completing the adjustment, lock the mechanical
adjustments with lock paint (RZZOLO01).
(2) BEST EYE (PD BALANCE) ADJUSTMENT
1. are
the
oe
CH. 1 probe
across
Ud) (+)and GZ
(—) on the Servo P.C.B.
rola
setting:
VOLT
Input coupling
2. Switch the player power ON, and play the test disc
(SZZP1014F or SZZP1054C).
3. Adjust VR701 until the RF signal eye pattern ampii-
tude is maximized.
—56-—
7 A\\WOAAANAAKARAK
\QQOOO DONO
(SZ SASTSIISSSZSZ
SZC
SZIZSZSISZS
| WASACAASAOAIRY
*Minimize the variation of amplitude.
ASKER ORIG
YI
SISAAMARERY
LY
SZ SASS SISSIES SCSI
SISZ
*Maximize the amplitude.
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