Cd Section; To Adjust Tracking Gain (Play Mode); To Adjust Focus Gain (Play Mode); To Adjust E/F Balance (Play Mode) - Samsung MAX-670 Service Manual

Alignment and Adjustments

4-3 CD Section

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 TP1.
4. Set WVR4 to 0mV.
4-4

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 TP1.
2. Load and play the disc
3. While the disc is running adjust the gain with NVR1703 as shown in the following figure.
Low Frequency
Normal 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.
High Frequency
---0 V
---0 V
VOLT/DIV : 0.2V
TIME/DIV : 2mS
High Fequency
---250mV
---100mV
---0V
---0 V
VOLT/DIV : 0.1V
TIME/DIV : 2mS
A
0V
B
A=B
Samsung Electronics