SAMSUNG HT-DB390 Service Manual Alignment & Adjustment
1-1Samsung Electronics
1. Alignment and Adjustments
1. Tuner
FM THD Adjustment
Output
Output 28 dB(±2dB)
60 dB
Minumum Distortion (0.4% below)
(Figure 1-1)
SSG FREQ.
Adjustment
point
(FM DET)
98 MHz
FM DETECTOR COIL
FM Search Level Adjustment
Adjust SVR1 so that “TUNED” of FLT is
lighted (Figure 1-2)
Figure1-2 FM Auto Search Level Adjustment
*Adjust FM S.S.G level to 28dB
Figure1-1 IF CENTER and THD Adjustment
SSG FREQ.
Adjustment
point
(SVR1)
98 MHz
BEACON
SENSITIVITY
SEMI-VR(20KΩ)
FM S.S.G
GND
28 dB
FM S.S.G
Output
GND
Speaker
Terminal
FM
Antenna
Terminal
Distortion Meter
Input
SET
Input
output
Oscilloscope
FM IN
FM Antenna
SET
10 kΩ
OUTPUT
AM SSG
450KHZ
INPUT
AM ANT
IN
Speaker Terminal
60cm
AM IF
VTVM
Oscilloscope
AM(MW) I.F Adjustment
Maximum output (Figure 1-3)
SSG FREQ.
Frequency
Adjustment
point
450 kHz
522 kHz
AM IF
Figure1-3 AM I.F Adjustment
OUTPUT
* Adjustment Location of Tuner PCB
AM(MW) OSC
Adjustment
Output
1~7.0 V
Received FREQ.
Adjustment
point
522~1611 KHz
MO
AM(MW) RF
Adjustment
ITEAM
594 KHz
MA
Maximum
Output (Fig1-4)
Fig 1-4 OSC Voltage
Loading...