Sony D-555 - Focus;Tracking Gain Adjustment

Focus/Tracking Gain Adjustment
A frequency responce analyzer or CD jig is necessary
in order to perform this adjustment exactly.
However, this gain has a margin, so even if it is slight-
ly off, there is no problem. Therefore, do not per-
from this adjustment.
Focus/tracking gain determines the pick-up followup
(vertical and horizontal) relative to mechanical noise
and metchnical shock when the 2-axis device operate.
However, as these reciprocate, the adjustment is at
the point where both are satisfied.
@ When gain is high, the noise when the 2-axis device
operates increases.
@ When gain is low, it is more susceptible to mecha-
nical shock and skipping occurs more easily.
This adjustment is to be performed when replacing
the following parts:
® optical pick-up block
® RV505 (focus gain VR)
® RVS5O1 (tracking gain VR)
Be careful not to move RV505 (focus gain volume)
and RVS5O01 (tracking gain volume) ordinarily.
BRN
)
Ger
ie
Pt
19S) @
oo, (RS
S30 .022725 (8, *
ol
i
RSso-
ae
a?
ror
i Bares ¥ Pe
o*
C232
Gres
+P
ws
@
10502
Eeery
ape
p05
CES
o
172516)
@
ee
ae
pore
*
22
se
->8
(4700
(3)®
xe
Ye
ES
RV504. 15 i ~
@
Bee.
idete>
pe
2eGy
© 5340047716 FI
On this set, it is very difficult to simplify this
adjustment. For those sets on which symptoms
such as ‘‘occasional skipping” are hard to discover,
or it is hard to tell if the set has been repaired,
use the CD jig and perform this adjustment. Refer
to the diagram below for connection of the CD jig.
The adjustment procedure is described in the sepa-
rate CD Jig Instruction Manual.
CD Jig Connecting Procedure:
Remove the solder jumpers at the TE and FE loca-
tions and connect the DC jig.
(Connect the points on both TE and FE located on
the side of IC501 to the output to the CD jig, and
points located on the side of volumes to the input
from the CD jig.)
— servo board -
Qs e | ie
0 :-01-725\(B)| 5 |=
2@OP/50 (SL
payee EA
R503
r <i
e
ee
C533“ @pszg . “6
° it
EA eat, 88
FY PGiess 3S
D
2
RVSOS RVS5O!I
|