Samsung RCD-M70 User manual

RADIO CASSETTE RECORDER
CD PLAYER
RCD-M70
SERVICE Manual
RADIO CASSETTE RECORDER CD PLAYER CONTENTS
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

2-1
2. Disassembly and Reassembly
2-1 Front Cabinet
1. Remove the Lid battery of A
2. Remove 9 screws of ! of its rear part
3. Remove 3 screws of @ of its rear part
4. Remove Front/Top Cabinet of B
Fig 2-1
1. Remove Top Cabinet of C to topward.
2-2 Top Cabinet
Samsung Electronics
Fig 2-2

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 (3Ω)
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(3Ω)
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

Samsung Electronics 1-3
1-2 Cassette Deck
Alignment and Adjustments
1-2-1. Recording BIAS adjustment
1) Connect frequency counter to KC433 (See Fig.1-6)and press the Record button.
2) Adjust KT431 (BIAS OSC COIL) until frequency counter reads 50KHz.
1-2-2. Tape AZIMUTH adjustment
1) Connect the equipments as per Fig.1-8 to adjust the tape azimuth with
test tape (recorded at 6.3KHz : MTT-113N)
2) Play the test tape after inserting in DECK.
3) Adjust the azimuth ajustment screw of left side of record/play head for maximum
output and for the same channel phase. (see Fig.1-7)
1-2-3. Tape speed adjustment
1) Connect the equipments as shown in Fig.1-8 adjust the tape speed with
test tape (recorded at 3KHz : MTT-111N)
Fig.1-6 Recording bias adjustment
Fig.1-8
Fig.1-7 Azimuth speed adjustment
50KHz
FREQUENCY
COUNTER
PRE/REC PART
KC433
Adjustment
Adjustment screw
R/P head
UNIT
UNDER TEST
VTVM
OSCILLOSCOPE
FREQUENCY
COUNTER
3000Hz

Samsung Electronics 3-1
3.Exploded Views and Parts List
3-1 Cassette Deck Exploded View and Parts List
No. Code No. Description Specification Remarks
AH59-20005X DECK-CASSETTE YN21ZSW-77
1 AH81-11037D R.F PULLEY ASS’Y 8521-200090-300
2 AH81-11154D BELT SUB 6600-090014-001
3 AH81-11037H CAM GEAR 6021-200802-001
4 AH81-11037J S REEL ASS’Y 8521-200080-300
5 AH81-11037K T REEL ASS’Y 8521-200070-300
6 AH81-11154E BELT MAIN 6600-090020-001
7 AH81-11150W R/P HEAD TC-951
8 AH81-11150X ERASE HEAD TC-230AN
9 AH81-11037Q MOTOR EG530YD2BH
3-1-1 AUTO STOP(OPTION)

3-2 Samsung Electronics
3-1-2 AUTO REVERSE(OPTION)
1
3
4
5
6
7
8
9
2
No. Code No. Description Specification Remarks
1
2
3
4
5
6
7
8
9
AH59-20006V
AH81-10005W
AH81-10005Z
AH81-10006C
AH81-10006R
AH81-11037Q
AH81-10022E
AH81-10022H
AH81-10022T
AH81-10023W
TAPE DECK ASS’Y
LEAF SWITCH
PINCH ROLLER ARM ASS’Y
RF BLET
MAIN BELT
MOTOR
R/P HEAD
P/B HEAD
E-HEAD
MAIN BELT
YN921ZSW-50
MSW-1541T
1921-04-301
1921-07-03
1821-12-173
EG530YD2B
MS15R-AA2N1
MR359-KF243
PHK380-MS16A
1821-17-03

Samsung Electronics 3-3
4
1
3-2 Main Exploded View and Parts List
3-2-1 Exploded View

3-4 Samsung Electronics
3-2-2 Parts List
No. Code No. Description Specification Remarks
1 AH64-00845B WINDOW-LCD PMMA
2 AH64-00835B CABINET-FRONT HIPS
3 AH64-00851B KNOB-POWER ABS
4 AH64-00853B KNOB-CONTROL ABS
5 AH64-00852B KNOB-TIMER ABS
6 3001-001177 SPEAKER-WOOFER 7W,4 ohm
7 G3X8-1CD CD-PACK
8 AH64-00840B DOOR-CD ABS
9 AH64-00846C KNOB-DECK, PLAY A ABS
AH64-00846D KNOB-DECK, REW ABS REWIND
AH64-00846E KNOB-DECK, FF ABS FAST FORWARD
AH64-00846F KNOB-DECK, EJECT/STOP ABS EJECT
AH64-00846G KNOB-DECK, PAUSE ABS PAUSE
AH64-00846B KNOB-DECK,REC ABS RECORD
AH64-00846H KNOB-DECK, PLAY B ABS PLAY AUTO-REVERSE
AH64-00846J KNOB-DECK, MODE ABS MODE
AH64-00846K KNOB-DECK, DIR ABS DIRECTION
10 AH64-00848B KNOB-FUNCTION ABS
11 AH64-00849B KNOB-VOLUME ABS
12 AH67-00083B KNOB-SOUND ABS
13 AH61-80030A DAMPER ASSY POM M0.8
14 AH61-00289A SPRING-CASSETTE SUS304,PI1.0
15 AH64-00837B CABINET-TOP ABS L/GRAY
16 AH61-00505B HOLDER-JOG ABS
17 AH64-00850B KNOB-JOG ABS
18 AH64-00838B DOOR-CASSETTE L ABS
19 AB64-00839B DOOR-CASSETTE R ABS
20 AH64-00843B WINDOW-CASS L PMMA SMOKE
21 AH64-00844B WINDOW-CASS R PMMA SMOKE
22 AH61-00502B HOLDER SIDE L ABS
23 AH61-00503B HOLDER SIDE R ABS
24 3001-001178 SPEAKER-TWEETER 7W,4 ohm
25 AH64-00836B CABINET-BACK HIPS
26 4201-001051 ANTENNA-ROD 730mm,210mm
27 AH64-00842B HANDLE ABS
28 AH63-00209B COVER-HANDLE ABS
29 AH64-00841B LID-BATTERY ABS
30 AH61-00586A SPRING BATT +- SUS304,PI1.2

Samsung Electronics 3-5
3-3 CD Deck Exploded View and Parts List
10
13
21
18
7
56
16
14
12
17
3
11
1
23
15
4
19
8
2
20
9
22
26
25
24
27
No. Code No. Description Specification Remarks
1 AH61-20463A BASE-MAIN ABS BLK
2 AH66-60035A BELT-PULLEY CR T1.5 BLK
3 AH59-20004Y DECK CDP ASS’Y CMS-P30AM6UD
4 3711-001061 CONNECTOR-HEADER BOX 6P 1R 2mm ANGLE SN
5 AH66-22004A GEAR POM BLK
6 AH66-22001A GEAR-CAM POM BLK
7 AH66-22002A GEAR-PULLEY POM BLK
8 AH66-20196A GEAR-SYNCHRO POM BLK
9 AH66-22003A GEAR-TRAY POM BLK
10 AH61-20464A HOLDER-CHUCK ABS+GF20%
11 AH66-30088A LEVER-LIFT ABS+GF20%
12 AH61-50182A SHAFT-CD SCREW TAP TITE
13 3302-000159 MAGNET-FERRITE 6P FERRITE
14 AH31-10021A MOTOR-DC RF-500TB-12560
15 AH41-10469A PCB-SUB XPC
16 AH66-10025A PULLEY-MOTOR POM BLK
17 AH73-10012A RUBBER-CD SI BLU45
18 AH63-70081C SHEET-CHUCK HYMELON
19 3409-001010 S/W-LEAF MIC
20 AH61-42002A STOPPER-PIN POM WHT
21 AH66-90060A TABLE-CHUCK ABS+GF10%
22 AH66-90059A TRAY ABS BLK
23 0402-000125 DIODE 1N4001 50V 1A
24 AJ60-10001A SCREW TAP TITE PWH M7 L5
25 AH60-10051A SCREW TAP TITE PWH PI12 M3X8
26 AH60-10107A SCREW TAP TITE PWH PI15 M3X12
27 AJ30-20001B PICK-UP SOH-AP