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WQ-CD220L
WQ-CD220L
2. Servo Unit
Since the adjusting procedure differs from that described in "ADJUSTMENT PROCEDURES OF AUDIO PRODUCTS", refer to the Service
Manual.
All the semivariable resistors must be set in the mechanical center position.
—
Test Stage
Adjusting Parts
|
Value/Adjusting Method
Instrument Connection
Set TEST MODE 0, and move the pickup to the center
Set TEST MODE 1 (make sure that the laser lamp lights)
After loading a disc, set to TEST MODE 2. (Check to see that focus servo is ON.: The disc does not rotate, and a whining sound is heard.)
Set TEST MODE 3 (Spin servo is turned on, and the disc rotates)
Tracking error balance adj.
NVR 1
~~ | Pin 6 (1/2Vec) and pin 4 (TG1) of
TP751
| *1 (See Fig. 19-1)
Set TEST MODE 4 (Tracking servo is turned on.)
| Check the HF signal waveform
iS
Focus gain adj.
VR751
Adjust to obtain the same
Pin 1 (FG1) and pin 5 (FG2) of
waveform on CH1 and CH2. *2
TP751 and ground (The relay
circuit is used.)
Tracking gain adj.
VR750
Adjust to obtain the same
| Pin 4 (TG1) and pin 2 (TG2) of
TP751 and ground (The relay
circuit is used.)
waveform on CH1 and CH2. *3
Check again the HF signal waveform.
| Set TEST MODE 5, and make sure that track No. is displayed.
Stick black tape on the disc, and play that section (Fig. 20-1). (Any mode other than the test mode is acceptable.)
Pin 6 (1/2Vcc) and pin 4 (TG1) of
TP751 *7
*2
Input oscillation frequency: 1.3 KHz, 100 mV rms
*3
Input oscillation frequency: 1.5 kHz, 300 mV rms
"5 The appropriate measuring range of the oscilloscope is 50mV and 0.5mS.
Connect the trigger to pin 14 (HFOK) of CFS700.
Trigger the coupling at DC and (-) slope. Observe the waveform in the normal trigger mode.
Tracking offset adj.
SRR
ASA NA8009,08
SKY
8—g—
4
: -
i
fae
2 ae
om
er eee
eee a] eee eee
Figure 19-1
Figure 19-2
-19~-
©
2. Servoeinheit
Wert/Einsteliverfahren
InstrumentenanschluB
Stift 6 (1/2Vcc) und Stift 4(TG1) des
TP751
——L.
TEST MODE 4 einstellen. (Abtast-Servo wird aktiviert.)
Die HF-Signal-wellenform
=
Amplitude von 1,3-2,0 Vss (Siehe {| Stift 3 (HF) und Stift 7 (GND) des
Uberpriifen.
Abb. 19-2)
TP751
erhalten wird. *2
Relaisschaltung wird verwendet.)
Stift 4 (TG1) und Stift 2 (TG2) des
TP751 und Masse (Die
Relaisschaltung wird verwendet.)
erhalten wird. *3
Die HF-Signalwellenform wieder Uberprtfen.
TEST MODE 5 einstellen und sicherstellen, daB die Titel-Nr. angezeigt wird.
Schwarzes Klebeband an die Disc kleben, und das Teil abspielen (Abb. 20-1). (Jede Betriebsart auBer der Test-Betriebsart ist annehmbar.)
1
Stift 6 (1/2Vcc) und Stift 4 (TG1)
des TP751 *7
*3 Eingangs-Schwingungsfrequenz: 1,5 kHz, 300 mV rms
Stick black tape on the disc
(1.2 ~ 1.5 mm wide)
—
2
;
-
Va
=
'
\
[
\
ci
~
27 koh
Oscilloscope
!
C)
1
|
FG1
OnNMS
0
oe
/
.
ona
i e e
|
ii -_
|
as
:
The error waveform should be
O
A disc other than the test disc
uniform and minimum.
MeNCG
can be used. Do not put the black
ee
=
FS
:
Pee
tape on the initialized section
(TOC).
Figure 20-1
Figure 20-2
Figure 20-3
90
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