Samsung MAX-VB630, Service Manual

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1-1 Samsung Electronics
1. Alignment and Adjustments
1-1. Tuner
FM THD Adjustment
Output
Output
28 dB(
±2
dB)
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(10K
½
)
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
20 k
½
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
TESTER
MAIN
PCB
VT GND
Fig 1-4 OSC Voltage
AM(MW)
OSC
Output
1~7.0
±0.5
V
Received FREQ.
Adjustment
point
522~1611 KHz
MO
AM(MW)
RF
ITEAM
594 KHz
MA
Maximum
Output
(Fig1-4)
LW
OSC
146~290 KHz
LO
2~7.0
±0.5
V
AM(MW)
RF
150 KHz
LA
Maximum
Output
(Fig1-4)
SW1
OSC
2.3~7.3 MHz
LO
1~8V
±1
V
SW1
RF
3.5MHz
MA
Maximum
Output
(Fig1-4)
SW2
OSC
9.5~26.1MHz
LO
SW2
RF
10MHz
MA
Maximum
Output
(Fig1-4)
1~8V
±1
V