Sanyo CDP-355 Service Manual page 7

CD PLAYER ADJUSTMENTS
c. ADJUSTMENTS
-d
Adjustment Measuring Service output Adjustment
,
Item
Adjustment value
instrument mode connection location I
(a) Tracking
Oscilloscope
TP102:TE
yes
VR131
Waveform symmetry
balance
TP 101 :VC
A =B
t
(b) Checking
Check be sure that the "eye"
IC131 (23) : RF
_
the "eye" Oscilloscope —
pattern is at the center of the
TP 101 :VC
pattern
waveform and that the diamond
shape is clearly defined
(a)
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
Tracking balance adjustment
Connect an oscilloscope to TP102 (TE) and TP101 (VC).
Short-circuit pattern. (@)
Insert the EXT. power plug. (~) (POWER "ON")
Remove the short-circuit pattern. (@).
( Service
mode:
TRACKING BALANCE )
Set the test disc.
PLAY I PAUSE switch push "ON" twice.
Adjust VR131 so that the oscilloscope's
waveform is symmetrical, as shown
in the illustration.
To cancel service mode. disconnect the
EXT. power plug from the unit.
~
5 msldiv
am-v. —. .
*/*
K w.>
mm
—/s
1
.
RF
I
.
..:
A=B
I I
500mVldiv
(b) Checking the "eye" pattern
(1) Connect an oscilloscope to IC131 (pin 23) (RF)
and TP101 (VC).
(2) Switch "ON" the POWER.
(3) Load the test disc.
(4) PLAY switch push ON.,
(5) Check to be sure that &be " eye " pattern is at the center of
waveform and that the diamond shape is clearly defined.
(6) Press the STOP button-
(7) Switch "OFF" the DC POWER.
D
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