SAMSUNG HT-DB390
Service Manual

1. Alignment and Adjustments
1. Tuner

FM THD Adjustment SSG FREQ. Adjustment point (FM DET) Output FM DETECTOR COIL 60 dB 98 MHz

Output GND FM S.S.G

FM Antenna SET Terminal Input Speaker Terminal output

Oscilloscope

Input

Distortion Meter

Minumum Distortion (0.4% below) (Figure 1-1)

Figure1-1 IF CENTER and THD Adjustment

FM Search Level Adjustment SSG FREQ. Adjustment point (SVR1) Output 98 MHz BEACON SENSITIVITY SEMI-VR(20K�) 28 dB(±2dB)
28 dB FM Antenna SET FM S.S.G GND FM IN 10 k�

* Adjustment Location of Tuner PCB
ITEAM
Received FREQ. Adjustment point

Adjust SVR1 so that �TUNED� of FLT is lighted (Figure 1-2) *Adjust FM S.S.G level to 28dB

AM(MW) OSC Adjustment 522~1611 KHz MO 1~7.0 V

AM(MW) RF Adjustment 594 KHz MA
Maximum Output (Fig1-4)

Figure1-2 FM Auto Search Level Adjustment

Output

AM(MW) I.F Adjustment SSG FREQ. Frequency Adjustment point 450 kHz 522 kHz AM IF
OUTPUT AM SSG 450KHZ

60cm AM IF AM ANT IN Speaker Terminal

Maximum output (Figure 1-3)

INPUT

OUTPUT

VTVM

Oscilloscope

Figure1-3 AM I.F Adjustment

Fig 1-4 OSC Voltage
Samsung Electronics 1-1