To Adjust Tracking Gain; To Adjust Focus Gain; To Adjust E/F Balance; To Adjust Focus Bias(Stop Mode) - Samsung MAX-460V Service Manual

4-3 CD
WVR2
WVR1 WVR3
WVR4
F.G
T.G
E/F. B F.B
Vref

4-3-1 To Adjust FOCUS BIAS(STOP mode)

1. Set Volt/Div of the oscilloscope to DC 100mV.
2. Ground the scope input and set the waveform to 0V, DC range.
3. Connect the GND terminal of the oscilloscope to
Vref, and (+) terminal to center of AP1.
4. Set WVR4 to 0mV.
Samsung Electronics
4-3-2 To Adjust Tracking Gain (PLAY mode)
1. Connect the GND terminal of the oscilloscope to Vref and (+) terminal to AP2.
2. Load and play the disc
3. While the disc is running adjust the gain with WVR1 as shown below.
Normal frequency Low frequency
---0 V
VOLT/DIV : 0.2V VOLT/DIV : 0.2V
TIME/DIV : 2mS TIME/DIV : 2mS
4-3-3 To Adjust Focus Gain (PLAY mode)
1. Connect the GND terminal of the oscilloscope to Vref and (+) terminal to AP1.
2. Load and play the disc
3. While the disc is running adjust the gain with WVR2 as shown in the following figure.
Normal frequency
Low frequency
---100mV
---0 V
VOLT/DIV : 0.1V VOLT/DIV : 0.1V
TIME/DIV : 2mS
TIME/DIV : 2mS
4-3-4 To Adjust E/F Balance (PLAY mode)
1. Set TIME/DIV of the oscilloscope to 2mS.
2. Set Volt/DIV of the oscilloscope to 0.5V.
3. Ground the scope input and set to DC
and then set the DC range.
4. Connect the GND terminal of the oscilloscope to Vref
and (+) terminal to center to AP2.
5. Load and play the disc.
6. Turn WVR1 counterclockwise to the minimum value.
7. Raise WVR3 and adjust the waveform so that its middle
comes to GND of the oscilloscope (or until the upper half
of waveform becomes symmetrical to the bottom half, A=B)
8. Adjust WVR1 (arrow) for normal sound.
Alignment and Adjustments
High frequency
---0 V
---0 V
VOLT/DIV : 0.2V
TIME/DIV : 2mS
High frequency
---250mV
---100mV
---0V
---0 V
VOLT/DIV : 0.1V
TIME/DIV : 2mS
A
0V
B
A=B
4-3