CD ADJUSTMENT
Electrical Adjustment
Preparations for Adjustments
So far we have presented explanations regarding compact disc
Measuring instruments and tools
player handling, notes prior to repair, handling the pickup and
(l) Test disc.: YEDS18 (Sony)
disassembly of the unit. Be
instructions before making any
sure to carefully read these
(2) Oscilloscope : SS5711 (1OMHZ or dual phenomenon)
adjustments.
or Memory scope : DSS6521 (Storage scope)
(3) Dlgltal voltmeter (Input Impedance IM ohm or more)
(4) Screw drivers (no metallic) for adjustments
Notes : a.
b.
c.
The adjustments can be using the equipment produced by other manufactures provided that the performance of that
equipment corresponds to that of the above listed models.
Use a 10:1 probe for observing signals on the oscilloscope and storage scope
Test disc is subject change without notice.
1. Initial set
Set the SVR11 at its initial position of adjustment controls as shown in figure below.
PICKUP
SVRI 1
FFC 13P
INITIAL SET
(–L—’)
(MECHANICAL CENTER)
r-
RESET SWITCH
%i+~
,Pl ,F,y CNI13L
/!!
S1301
TRACKING
TP2 FE-J,’,
o
BALANCE ADJ
TP3 TEJ/
TP4 VC—
@l
1C101
SVR1l
0
1C103
FROM AMP
I
— ~N,07
LJ
FROM POWER I
—~CN105
‘Upp”<
E
CN102 C
CN103 C=
[7?
TO FRONT PCB
2. Tracking Balance Adjustment (SVRI 1)
1. Connect the oscilloscope to TP3(TE), TP4(VC).
2. Turn on the power of the unit.
3. Load the test disc.And set the function toCD position.
4. Press the BAND (Tuner) button and CD MEMORY button at
the same time. Soon after, press the PLAY / PAUSE button
within a second. (See service mode)
*Service mode (Tracking balance adjustment mode) entry
5. Press the PLAY/PAUSE button.
6. Adjust SVRI 1 so that the TE (Tracking Error) signal wave-
form of TP3 on the oscilloscope is vertically symmetrical
relative to OV. (See figure right side )
* If this adjustment is imperfect, become run away the sled
motor (pickup sending motor), Inferior playabilky
MECHA
MOTOR
MECHA
SWITCH
I I I
i 500PS
I I I
L4——L—4=—— L-4––!-–-.4–-J
TP1
(RF)
Ov
TP3
(TE)
-9-
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