Band Pass Filter - Sanyo GCD 2000 Service Manual

i
..
SERVICE MODE
I NUMBER
1=
1
2
3
R-
STATE OF CD ERROR
Focusing is not possible in focus search.
The sub-code is not input during disc startup.
TOC cannot be read.
The focus was lost while
the
servo was on (during playing, etc.).
The sub-code is not input while the servo is on (during playing, etc.).
TABLE 4 : DISPLAY OF CD ERRORS
CD ADJUSTMENT
Electrical Adjustment
IOK
So far we have presented explanations regarding compact
disc player handling, notes prior to repair, handling the pickup
and disassembly of the unit.
Be
sure to carefully read these
instructions before making any adjustments.
"r;:D–M{'o-'cope
Preparations
for Adjustments
BAND PASS FILTER
Measuring instruments, tools and filter (4) Oscillator (400Hz,
300mV
RMS)
(1) Test
disc. :
YEDS 18 (Sony)
(5) Frequency Counter (5MHz ; or
more)
(2) Oscilloscope : SS5711 (1OMHZ or dual phenomenon)
(6) Screw drivers (non-metalic) for adjustments
or Memory scope : DSS6521 (Storagescope)
(7) Band Pass
Filter
(3) Digital voltmeter (Input impedance 1M ohm or more)
(8)AC Voltage Meter
Notes :a.
b.
c.
1.
Initial
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.
-.
., .— . . _ _. .-
... . . .
set
1. Set the SVRI 1
to the mechanical center position as the initial position
of as shown in
figure below.
TF
SVR1l
TP1 RF
TRACKIW R4LANCE
~TP2 FE SPINDLE ~
_TP3 TE SLED MOTOR
TP4 '3WI
LIMIT SW
CN106
~—
-.
L
Ll–
II
/'P
TO SYSCOiU mssc32r4
TO PICK UP
(C%86) (c%%
2.
1.
2.
3.
4.
Tracfdng Balance Adjustment (SVRlfl)
Connect
the oscilloscope to TP3 (l_fE) and
(GND.).
COMAIN PC
B
E
TPIO!IRF)
1P102 (FE)
TPlO]llE)
1PU14@ NO)
'a
Sw?ll
TP4 5. Adjust SVR11 so that the TE
(Tracking Error) signal
waveform of TP3 on the oscilloscope is vertically sym-
Turn on the power of the unit.
Insert test disc .
metrical relative to OV. (See figure next page)
Playback the test disc.
Note: If this adjustment is imperfect, the sled motor (pickup
Continuously press the forward search ~ or back-
sencling motor) will run and normal play will be dis-
ward search 44 button to do it.
abled.
-12-