Alignment And Adjustments; Tuner Adjustments - Samsung MM-J4 Service Manual

1. Alignment and Adjustments

1-1. Tuner
* Adjustment Location of Tuner PCB
AM(MW) RF
AM(MW) OSC
ITEAM
Adjustment
Adjustment
Received FREQ.
522~1611 KHz
Adjustment
MO
point
Maximum
1~7.0±0.5V
Output
Output(Fig1-4)
Fig 1-4 OSC Voltage
Samsung Electronics
LW OSC LW RF
Adjustment Adjustment
594 KHz 146~290 KHz 150 KHz
MA LO LA
Maximum
2~7.0±0.5V
Output(Fig1-4)
FM THD Adjustment
SSG FREQ.
98 MHz
Adjustment
point
FD
(FM DET)
Output 60 dB
Minumum Distortion (0.4% below)
(Figure 1-1)
FM Search Level Adjustment
SSG FREQ. 98 MHz
Adjustment
point
SVR1 (10KΩ)
(SVR1)
Output 28 dB(±2dB)
Adjust SVR1 so that "TUNED" of LCD is
lighted (Figure 1-2)
*Adjust FM S.S.G level to 28dB
AM(MW) I.F Adjustment
SSG FREQ.
450 kHz
Frequency
522 kHz
Adjustment
point AA
Maximum output (Figure 1-3)
FM
Output
Antenna SET
GND
Terminal
Oscilloscope
FM S.S.G
Input
Speaker
Terminal
output
Distortion Meter
Figure1-1 IF CENTER and THD Adjustment
FM Antenna
28 dB
SET
GND
FM S.S.G FM IN
10 kΩ
Figure1-2 FM Auto Search Level Adjustment
60cm
AM IF
AM ANT
OUTPUT
IN
Speaker Terminal
AM SSG
450KHZ
OUTPUT
INPUT
VTVM Oscilloscope
Figure1-3 AM I.F Adjustment
Input
1-1