Adjustment - Sanyo DC-T44 Service Manual

CD
'\'.
ADJUSTMENT
Measurement instruments
In the adjustment, use the relay cord : 614 229 7094
6)
Test Disc :
YEDs18(soIyp
For connection PC8 :
@Oscilloscope : 10 MHz class or Storage scope
CD MAIN PCB(CN142) and SERVO D/A PCB(CN105)
Oscilloscope : 10 MHz class or DC voltage mater
@ Frequency Counter
@ Adjustment Driver (Non metallic) : for SVR11
ITEM
CONNECTION
PARTS
REMARKS
@ PLL VCO Free Run
Frequency Counter
(PLCK-GND)
T102
4.30 f 0.01 MHz
@ Tracking Balance
Oscilloscope
(TE - GND)
SVR11 Symmetrical Waveform
1. INITIAL
~ Perform initial setting for SVR11 as shown in fig.4.
2. FREERUN FREQUENCY ADJUSTMENT FOR PLL-VCO.
0
Connect the frequency counter to TP37(H),TP104(E).
. .-
@ Turn on the power of the unit.
@ Adjust T102 so that the frequency counter reads 4.30 f 0.01 MHz.
If this adjustment is no good, get the long seek time, not read TOC. not sound in the worst case become high speed tuning
reverse and it may wound the disc.
,-
3. TRACKING BALANCE '"-
.. . .
0 Connect the oscilloscope to TP103(TE),TPI04 (E).
.
.. '.":
@ Turn on the power of the un~.
@ Insert Test Disc and press the Play button.
..
. . . ..-.
@ Continuously press the forward(or reverse) search button.
@ Adjust SVR11 so that the waveform of TP103(TE) is vertically symmetrtial relative to DCOV level. (Refer to fig,l.
. If this adjustment is imperfect, become run away the sled motor ( pick sending motor), inferior playability.
TPIOI
(RF)
-.
TPI03
(TE)
Ov
44 SEARCH
Eye
Pattern (Refer Figure)
Ov
SEARCH *
Fig.1
V: 5001nV/diV H : 0.5P S/dV
t
[ I
HI
r
m
lW
m
500ns
-1
TP1
–18–
Fig.2