Samsung MAX-460V, Service Manual

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4-3 Samsung Electronics
4-3 CD
WVR1
T.G
WVR2
F.G
WVR3
E/F. B
WVR4
F.B
Vref
0V
A
B
A=B
---100mV
---0V
---250mV
---0 V
---100mV
---0 V
---0 V
---0 V
---0 V
4-3-1 To Adjust FOCUS BIAS(STOP mode)
4-3-3 To Adjust Focus Gain (PLAY mode)
4-3-2 To Adjust Tracking Gain (PLAY mode)
4-3-4 To Adjust E/F Balance (PLAY 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.
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.
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.
VOLT/DIV : 0.2V
TIME/DIV : 2mS
Normal frequency
Normal frequency
Low frequency High frequency
Low frequency High frequency
VOLT/DIV : 0.1V
TIME/DIV : 2mS VOLT/DIV : 0.1V
TIME/DIV : 2mS VOLT/DIV : 0.1V
TIME/DIV : 2mS
VOLT/DIV : 0.2V
TIME/DIV : 2mS VOLT/DIV : 0.2V
TIME/DIV : 2mS
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