Samsung RCD-1230 Service Manual page 20

2. CD ADJUSTMENT
1) CLV ADJUSTMENT
10: 1 damping probe.
A. Turn power on without loading a disc.
B. Connect S2 (Asymetry ; short)
C. Connect TP10 to GND and TP2 to positive terminal on the Frequency Counter.
D. Adjust VR 1702 so that the Frequency Counter reads 4.28MHz + (0.01MHz)
E. Disconnect S2.
2) EF BALANCE ADJUSTMENT (Power On)
A. Set Oscilloscope Time/Div to 2mS.
B. Set Oscilloscope Volt/Div to 0.5V.
C. Connect TP1 (Vref) to GND and TP4 (T.G) to positive terminal on the oscilloscope.
D. Press PLAY with loading a disc.
E. Adjust VR1704 all the way counter clockwise. (Intermittent sound)
F. Adjust VR1701 so that the waveform is equally symmetrical refer to waveform below.
G. Adjust VR1704 so that Sound comes out normally (Nearly mid-position of VR1704).
A=B VR1701
_ 3) FOCUS BIAS ADJUSTMENT
A. Turn power on without loading a disc.
B. Set Oscilloscope Vol/Div to 0.1 Vdc
C. Connect TP1 (Vref) to GND and TP3 (F.G) to positive terminal on the oscilloscope.
D. Adjust VR1703 so that the voltage is 0 mV DC on the oscilloscope.
4) TRACKING GAIN ADJUSTMENT (Power On)
A. Connect TP1 (Vref) to GND and TP4 (T.G) to positive terminal on the oscilloscope.
B. Press PLAY with loading a disc.
C. Adjust VR1704 so that Waveform is as shown in the figure below.
(NORMAL WAVEFORM) (LOW TRACKING GAIN)
-ov
a2 vow Paci
VOLT/DIV : 0.2V
TIME/DIV : 2mS
VOLT/DIV : 0.2V
TIME/DIV : 2mS
Qs
e
VR1702
VR1703
[\)
©
VR1704
(HIGH TRACKING GAIN)
VOLT/DIV : 0.2V
TIME/DIV : 2mS
l
5) FOCUS GAIN ADJUSTMENT (Power ON)
A. Connect TP1 (Vref) to GND and TP3 (F.G) to positive terminal on the oscilloscope.
B. Press PLAY with loading a disc.
C. Adjust VR1705 so that the waveform is as shown in the figure below.
(NORMAL WAVEFORM)
(LOW FOCUS GAIN)
Re
VOLT/DIV : 0.1V VOLT/DIV :0.1V
TIME/DIV : 2mS TIME/DIV : 2mS
VR1705
(HIGH FOUCS GAIN)
VOLT/DIV : 0.1V
TIME/DIV : 2mS
Q