Cd Section; Preparation For Adjustment; Vco Free-Run Frequency; Servo Unit - Sharp CD-C500Z Service Manual

When adjusting, be sure to refer to Service Manual
" ADJUSTMENT PROCEDURES OF AUDIO PRODUCTS" .
Test
l
Depressing the FF button and REW button, turn on the power
switch.
Adjusting Specified
Point
VR6 MHz I 15 kHz
4.320
The procedure of adjustment differs from that stated in Service
Manual "ADJUSTMENT PROCEDURES OF AUDIO
PRODUCTS" .
Follow the procedure stated below.
l
Adjusting Specified Value
Point
VR3
l
Adjusting Specified Value
Point
VR2
l
Adjusting Adjusting Method
Point
l
1
VR4
Adjust so as to obtain symmetric waveform (Figure 20-2)
when DC is 0 V.
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* 2: Apply sine wave (Oscillation Frequency: 1 .O kHz 1 .O Vrms)
as shown in Figure 20-3.
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Adjusting Adjusting Method
Point
Adjust so that the
VR5
voltage of CH-1 is equal
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3: Apply sine wave (Oscillation Frequency: 1 .O kHz 1 .O Vrms)
as shown in Figure 21-I.
Check again the focus offset, tracking offset and tracking
error balance.
l
Point
__ __
Make sure that waveform is as shown in Figure 21-2.
Instrument Connection
Pin 9 of ICl and GND.
Instrument Connection
Pin 2 and pin 1 (GND) of
CNP2.
Instrument Connection
Pin 4 and pin 1 (GND) of
CNP2.
Instrument Connection
Instrument Connection
and GND.
3
Figure 20-l TRACKING ERROR BALANCE
Figure 20-2 TRACKING ERROR BALANCE
3. 3K
Figure 20-3 FOCUS GAIN
20
M o r e t h a n
1. ZVP-P
I