Table of Contents
Advertisement
SECTION
2
ELECTRICAL ADJUSTMENTS
1.
Perform adjustments in the order given.
2.
Use YEDS-18
(Part No: 3-702-101-01)
disc unless otherwise
indicated.
3.
Use the oscilloscope with more than 10 МО impedance.
RF PLL Frequency Adjustment
.
Procedure:
frequency counter
main board
—
ТР (РСК)
OO
+
1.
Connect the frequency counter to test point TP (PCK).
.
Turn POWER
switch on.
3.
Adjust RV201 so that the reading on the frequency counter is
4.3218MHz +30kHz
4.
Put disc (YEDS-18) in and press D button.
5.
Confirm that the reading on frequency counter is 4.3218M Hz.
E-F Balance Adjustment
This adjustment should be made when replacing TOP (T-type
Optical Pick-up).
Procedure :
oscilloscope
(DC range)
main board
—ə@—
ТР (ТЕО) O-4————O +
Fe -
1.
Connect oscilloscope to test point TP (TEO).
Connect
test point TP
(ADJ)
and test point TP
(TES)
to
ground with lead wire.
3.
Turn POWER switch on.
4.
Put disc (YEDS-18) in and press > button.
5.
Adjust RV101 so that the traverse waveform
is symmetrical
above and below.
6.
After adjustment, remove the lead wire connected in step 5.
Note : Prominent
that make a
long of sweep time.
A
A
OV
=>
OV
B
B
A=B
A=B
(within5%)
(within 5%)
VOLT/DIV:
1V
TIME /DIV : Ims
Focus Bias Adjustment
This adjustment should be made when replacing TOP (T-type
Optical Pick-up).
Procedure :
oscilloscope
(DC range)
main board
C)
—
TP (RF) о«--0 +
Fe
Connect oscilloscope to test point ТР (КЕ).
Turn POWER switch on.
Put disc (YEDS-18) in and press P button.
Adjust RV104 for an optimum waveform eye pattern or so that
the peak is maximum. Optimum eye pattern means that shape
"С" can be clearly distinguished at the center of the wavefor-
m.
Bop
mr
RF signal waveform
NUR NW
WN
|
М W
|
|
WV M
A= 1.3+0.3 (Vp-p)
Adjustment Location :main board
RF PLL
FREQUENCY
ADJ
POK
|
RV201
E-F
BALANCE
ADJ
ADJ
TES
TEO
RV101
Advertisement
Table of Contents
