Sharp CD-C500Z

CD SECTION
1. Preparation for Adjustment
When adjusting, be sure to refer to Service Manual
“ADJUSTMENT PROCEDURES OF AUDIO PRODUCTS”.
l Test mode of control microcomputer
Depressing the FF button and REW button, turn on the power
switch.
2. VCO Free-Run Frequency
Adjusting
Specified Value
Point
VR6
4.320 MHz I 15 kHz
Instrument Connection
Pin 9 of ICl and GND.
3. Servo Unit
The procedure of adjustment differs from that stated in Service
Manual “ADJUSTMENT PROCEDURES OF AUDIO
PRODUCTS”.
Follow the procedure stated below.
l Focus Offset
Adjusting
Specified Value
Instrument Connection
Point
VR3 Oi50mV Pin 2 and pin 1 (GND) of
CNP2.
l Tracking Off set
Adjusting
Specified Value
Point
VR2 Oi50mV
Instrument Connection
Pin 4 and pin 1 (GND) of
CNP2.
l Tracking Error Balance
Adjusting Adjusting Method Instrument Connection
Point
VR4
l 1
TPl (TGl) and GND.
*1 : Short-circuit the Pin 4 of IC4 and GND.
Adjust so as to obtain symmetric waveform (Figure 20-2)
when DC is 0 V.
l Focus Gain
* 2: Apply sine wave (Oscillation Frequency: 1 .O kHz 1 .O Vrms)
as shown in Figure 20-3.
l Tracking Gain
Adjusting Adjusting Method Instrument Connection
Point
VR5
Adjust so that the TPl (TGl)(TG2)
voltage of CH-1 is equal
and GND.
i
*
/ to that of CH-2. l 3
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 Check HF output
1 Adjusting ( Adjusting Method 1
Instrument Connection
Point /
__ __
1 TPl (HF) and GND.
/
Make sure that waveform is as shown in Figure 21-2.
GNDo !
1
I
I -
I,
I
1
I
-------------I
;RACKING ERROR
BALANCE ADJ. JIG
DC=OL
I
-I
Figure 20-l TRACKING ERROR BALANCE
More than
1. ZVP-P
Figure 20-2 TRACKING ERROR BALANCE
IOOK
3. 3K
I
~~-~--~~~~-----~~~-J
FOUCUS GAIN ADJ. JIG
Figure 20-3 FOCUS GAIN
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