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CLD-97,CLD-38
5.3 ELECTRICAL ADJUSTMENT
"52 + 2usec
uw
(1/3) 1€201 pin 3
H1 pow
Q306Emitter
a
os 1C201 16pin
CH2
Pin 5 voltage =
Pin 6 voltage + 218 mV £20 mV
Master clock adjustment
MEMORY ASSY(1/3)
VL301
MEMORY ASSY(1/3)|
X: 2V/div
Y : 10usec/div
Half H rejection adjustment
LD disc playback
During LD disc playback, adjust VR201 so that the pulse width of IC201 pin 3 becomes 52 +2 psec.
MEMORY ASSY(1/3)
a2
'ust
Burst gate timing adjustment
VR203
COMP assembly
1€202 pin 5
1€202 pin 6
MAIN ASSY(2/3)
VR101
During the playback of #4,801 on the LD test disc, adjust VR101 so that the voltage of 1C202 pin 5
becomes pin 6's voltage of +218 mV £20 mV.
Detection level adjustment
Playback of #4,801 on LD test disc
1C201 pin 5
Cover
the disc's
center
hole with
cellophane
tape to make
the disc
eccentric.
Playback #2,701
+ During the playback of #2,701 on an eccentric LD test disc, adjust VR204 to minimize the amplitude
of the audio output terminal's waveform and to minimize the L and R level difference.
* To make the LD DISC eccentric, cover the disc's center hole with cellophane tape.
MEMORY ASSY(1/3)
VR204
10mV/div
5msec/div
Audio output terminals
T
PLL gain adjustment
(L and R channels)
MAIN ASSY(2/3)
20mV//div
MAIN assembly(2/3)
During still playback of #19,801 on the LD test disc, refer to the video signal waveform and adjust
8
Video level adjustment
719,801 still
| 1.5Vp-p
+5%
Pedestal
1C101 40pin
1€101 42pin
100% White peak
VR102
10psec/div
Q114 EMITTER
VR102 so that the 100% white amplitude from the pedestal becomes 1.5 Vp-p +5%.
level
CH1: 20mV/div
MAIN assembly
:
;
MEMORY ASSY(3/3
:
.
'
9
1H delay video level adjustment
VR103
(3/3)
CH2: 20mV/div
(2/3)
#19,801 still
During still playback of LD test disc frame 719,801, adjust VR103 to equalize the amplitude from the
10psec/div(Trigger) | 1101 pins 40 and 42
video signal sync tip to the white peak of IC101 pins 40 and 42.
a
level
During still playback of #19,801 on the LD test disc refer to the VIDEO signal waveform at S terminal
output and adjust VR501 so that the white amplitude from the pedestal becomes 0.75Vp—p
+5%
(Y-output)
level
(7592 terminated)
0.260Vp-p
During still playback of 19,801 on the LD test disc refer to the VIDEO signal waveform at S terminal
output and adjust VR503 so that the white amplitude from the pedestal becomes 0.75Vp—p £5%
(7582 terminated)
MEMORY ASSY(3/3)
VR503
20mV/div
10sec /div( Trigger)
S video output terminal
(C output)
+10%
-15%
12 | C€ output level
#19,801 still
: Use all the Oscilloscope's probes at 10:1
94
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