SAMSUNG RCD-590 Service Manual Alignment & Adjustment
1. Alignment and Adjustments
1-1 Tuner
Samsung Electronics 1-1
FM THD Adjustment
Minimum Distortion (Figure 1-1)
SSG FREQ.
Adjustment
point
(IT1)
98 MHz
FM DETECTOR COIL
FM Stereo Adjustment
L-CH/R-CH : Maximum(Figure 1-3)
SSG FREQ.
Frequency
Adjustment
point
(ISVR1)
98MHz
98MHz
SEMI-VR(5KΩ)
FM Search Level Adjustment
Adjust ISVR2 so that “TUNED” of LCD
is lighted (Figure 1-2)
Figure1-2 FM Auto Search Level Adjustment
Figure1-3 FM Stereo Separation Adjustment
Figure1-1 IF CENTER and THD Adjustment
SSG FREQ.
Adjustment
point
(ISVR2)
98 MHz
BEACON
SENSITIVITY
SEMI-VR(50KΩ)
FM SSG
FM
SSG
75Ω
Dummy
5KΩ
Stereo
Modulator
(Pilot 10%)
OUT
Oscilloscope
FM antenna
SET
Speaker
Terminal
EXT
GND
VTVM
GND
26 dB
FM SSG
Output
GND
Speaker
Terminal
FM
Antenna
Terminal
Distortion Meter
Input
SET
Input
output
Oscilloscope
FM IN
FM Antenna
SET
50 kΩ
FREQ:1KHz
MOD : 40KHz DEV
1-2 Samsung Electronics
1-1-1 Test Equipment
1-1-2 Pre-Adjustment
1-1-3 AM Adjustment
1. AM Standard Signal Generator (S.S.G) : 400Hz, 30% MOD
2. Oscilloscope
3. VTVM
4. Frequency counter
5. Loop antenna
6. Dummy load (3½)
7. DC voltmeter
1. Check the source voltage
2. Press TUNER/BAND to select the AM(MW) function.
3. Set the EQ/S.BASS control to OFF position.
4. Set the volume control to approximaterly 50mw
Intermediate
frequency (IF)
adjustment
AM frequency
coverage
adjustment
AM tracking
adjustment
Figure 1-4
Connect DC voltmeter to AM
VT(OR10) and GND
1
2
4
5
3
Figure 1-5
Figure 1-5
450 KHz
594 KHz
Figure 1-4
SET
60 cm
AM Signal
Generator
Test Loop
Antenna
Speaker
Terminal
VTVM
IN
OUT
GND
Oscilloscope
AM-ANT
Figure 1-5
SET
AM VT(OR10)
GND
Input
DC Voltmeter
594 KHz
MW-ANT
-
-- -
OCT2
1611KHz
-
-
522 KHz
522 KHz
IT 2
OT 1
1.0V
Maximum output
Maximum output
4.6V
Non Adjust
Remark
FREQ. Setting
Adjust. PointSSG.FREQ.Item
Step
Connection
Alignment and Adjustments
Dummy Load(3½)
1-1-4 MW/LW
Intermediate
frequency (IF)
adjustment
MW frequency
coverage
adjustment
MW tracking
adjustment
Fig 1-4
1
2
4
5
3
Fig 1-5
594 KHz
594 KHz
MW ANT
COIL
-
OCT2
-
-
LW ANT
COIL
OT1
1.0V(LOW)
Maximum output
Maximum output
Remark
FREQ. Setting
Adjust.
Point
SSG.FREQ.
Item
Step
Connection
522 KHz
4.6V(HIGH)
1611 KHz
1404 KHz
NON Adjust
6
Fig 1-4
-
144 KHz
OT2
0.7V(LOW)
-
290 KHz
OCT4
3.1V(HIGH)
LW frequency
coverage
adjustment
7
9
8
LW tracking
adjustment
Fig 1-5
170KHz
170 KHz
270KHz
-
-
Fig 1-5
450 KHz 522 KHz
IT2
Maximum output
NON Adjust
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