Samsung MM-16 Service Manual page 15

Alignment and Adjustments
4-3 CD
TE CENTER FE CENTER
E.F BAL
NVR1704 NVR1703 NVR1702 NVR1701
TP1
TP2
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 NVR1701 to 0mV.
4-4
F.BIAS
Vref
4-3-2 To Adjust Tracking Gain (PLAY mode)
1. Connect the GND terminal of the oscilloscope to Vref and (+) terminal to TP2.
2. Load and play the disc
3. While the disc is running adjust the gain with NVR1704 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.
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 TP2.
5. Load and play the disc.
6. Turn NVR1704 counterclockwise to the minimum value.
7. Raise NVR1702 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 NVR1704 (arrow) for normal sound.
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
0V
A
B
A=B
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