SAMSUNG RCD495QH Service Manual
RADIO CASSETTE RECORDER
CD PLAYER
RCD-495
SERVICE
Manual
RADIO CASSETTE RECORDER CD PLAYER
CONTENTS
ON
FUNCTION
REPEAT
REC/PAUSE
MODE
SBS BAND
OFF
CD
RADIO
TAPE
OFFFMAM
M
IN
M
A
X
1. Alignment and Adjustments
2. Disassembly and Reassembly
3. Exploded Views and Parts List
4. Electrical Parts List
5. Block Diagrams
6. PCB Diagrams
7. Wiring Diagram
8. Schematic Diagrams
ELECTRONICS
© Samsung Electronics Co.,Ltd.MAY 2000
Printed in Korea
Code no. AH68-20202K
2-1
2. Disassembly and Reassembly
2-1 Front Cabinet
1. Remove the battery of A
2. Remove 7 screws of ! of its rear part
3. Remove Front Cabinet of B
Fig 2-1
1. Lift handhold to topward, and remove 3 screws of @ of its top part
2. Press the CD COVER and DECK COVER, and remove 3 screws of
# of its top part
3. Remove Top Cabinet of C
2-2 Top Cabinet
3
Samsung Electronics
Fig 2-2
1. Alignment and Adjustments
1-1 Tuner
Samsung Electronics 1-1
1-1-3 FM Adjustment
1-1-1 Test Equipment
1-1-2 Pre-Adjustment
1. AM/FM Standard Signal Generator (S.S.G)
- AM : 400Hz, 30% MOD - FM : 1KHz , 40KHz(Deviation)
2. Oscilloscope
3. VTVM
4. Frequency counter
5. Loop antenna
6. Dummy load (3Ω)
7. DC voltmeter
8. SW Dummy ANT
9. FM Stereo Modulator
10. FM/AM IF Generator : 10.7MHz,455kHz
1. Check the source voltage
2. Select desired Band and Function.
3. Set the SBS control to off position.
4. Set volume control to approximaterly 50mW(3ohm)
Intermediate
frequency (IF)
adjustment
FM frequency
coverage
adjustment
FM tracking
adjustment
Fig 1-3
1
2
4
5
3
Fig 1-2
Fig 1-3
10.7 MHz
87.3 MHz
Tune to
the lowest
FL2
FM OSC COIL
checked
Maximum output
Remark
FREQ. Setting
Adjust. Point
SSG.FREQ.Item
Step
Connection
Tune to
the lowest
Best resonating
point of SSG
Best resonating
point of SSG
109.5 MHz
Tune to
the highest
VC1
OSC TRIMMER
90 MHz
90 MHz
106 MHz 106 MHz
VC2
ANT TRIMMER
Stereo
separation
adjustment
6
Fig 1-3
Connect Stereo
generatorto S.S.G
additionally
98 MHz
98MHz
Not required
Not required
Not required
1-2 Samsung Electronics
1-1-4 AM Adjustment
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
455 KHz
600 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
600 KHz
515 KHz
1400 KHz 1400 KHz
-
Maximum output
Maximum output
Remark
FREQ. Setting
Adjust. PointSSG.FREQ.Item
Step
Connection
Alignment and Adjustments
Dummy Load(3Ω)
1-1-5 MW/LW
Maximum output
Fig 1-3
FM
SSG
75Ω
Dummy
Stereo
Modulator
(Pilot 10%)
OUT
Oscilloscope
FM antenna : FTP1
SET
Speaker
OUT
EXT
GND
VTVM
GND
3.2 ohm load
Fig 1-2
Input o
output o
IF GENERATOR
GND
O
PIN 19 OF FIC1
O
FTP1 BODY
O
GROUND
O FTP2
TUNER PART
OSC TRIMMER
: VC4
Tune to
the lowest
AM IFT
: IT 1(WHT)
AM OSC COIL
: OT 1
Tune to
the lowest
Tune to
the highest
ANT TRIMMER
: VC3
1680 KHz
(1780)KHz
AM ANT COIL
Best responding
point of SSG
Best responding
point of SSG
Intermediate
frequency (IF)
adjustment
AM frequency
coverage
adjustment
AM tracking
adjustment
Fig 1-5
1
2
4
5
3
Fig 1-5
600 KHz
600 KHz
AM ANT
COIL
VC3
VC4
1680 KHz
515 KHz
LW ANT
COIL
OT1
Best responding
point of SSG
Maximum output
Maximum output
Remark
FREQ. Setting
Adjust.
Point
SSG.FREQ.
Item
Step
Connection
Tune to
the lowest
Best responding
point of SSG
Tune to
the highest
1400 KHz
1400 KHz
Maximum output
IF is the same as 2 band’s
6
Fig 1-5
145 KHz
Tune to
the lowest
OT2
Best responding
point of SSG
295KHz
Tune to
the highest
OCT4
Best responding
point of SSG
LW frequency
coverage
adjustment
7
9
8
LW tracking
adjustment
Fig 1-5
170MHz
170 MHz
250 MHz
250 MHz
Not
required
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