Samsung DVD-CM420 Service Manual page 16

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Alignment and Adjustments
2-2-3(b) RF SUM Level Adjustment Method
1) Connect an Oscilloscope to the "RF EQC " Test Point. (See Fig. 2-5)
2) Play a Normal DVD disc and set the Oscilloscope Range as follows :
(Voltage ; 50mV/Div., Frequency ; 10m Sec.)
3) Adjust the RF SUM Level by turning the Semi-Variable Resistor (VR1) on the DVD Main PCB (See Fig. 2-8).
4) Adjust according the to table on the previous pages :
◆ 1.7V ± 0.2V
⌘ Warning : Do not turn the Voltage up too high, as this may damage the Laser Diode permanently.
Fig. 2-9 RF SUM Level Wavefrom
2-8 Samsung Electronics