Samsung MM-L7, MM-ZL7 Service manual

MICRO COMPONENT
SYSTEM

MM-L7/ZL7

SERVICE

Manual

MICRO COMPONENT SYSTME CONTENTS

1. Alignment and Adjustments

2. Exploded Views and Parts List

3. Electrical Parts List

4. Block Diagrams

5. PCB Diagrams

6. Wiring Diagram

7. Schematic Diagrams

ELECTRONICS

© Samsung Electronics Co.,Ltd. APR. 2001

Printed in Korea
Code no. AH68-20183P

1Samsung Electronics

1. Alignment and Adjustments

1. Tuner

FM THD Adjustment

Output

Output

28 dB(±2dB)

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(20KΩ)

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 kΩ

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

AM(MW) OSC
Adjustment

Output

1~7.0±0.5V

Received FREQ.

Adjustment
point

522~1611 KHz

MO

AM(MW) RF
Adjustment

ITEAM

594 KHz

MA

Maximum
Output(Fig1-4)

TESTER

MAIN
PCB

VT GND

Fig 1-4 OSC Voltage

LW OSC
Adjustment

146~290 KHz

LO

2~7.0±0.5V

AM(MW) RF
Adjustment

150 KHz

LA

Maximum
Output(Fig1-4)

(GND)

VTVM

Alignment and Adjustments

2 Samsung Electronics

2-1To Adjust Tape Speed

1) Measuring tape: i) MTT-111 (or equivalent)
(Tapes recorded with 3kHz)

ii) MTT-5512 (or equivalent)

2) Connect the cassette deck to the frequency counter

as in figure 1-5.

1) Before the actual adjustment, clean the play/recording

head.

2) Measuring tape :

i) MTT-114N(or equivalent 10kHz AZIMUTH control)

ii) MTT-5512

3) The cassette deck is connections as shown in figure 1-7.

Notes

Notes

NOR
SPEED
Control

1

OUT

(connected

to the frequency

counter)

Turn VSR1 to
left and right
(FRONT PCB)

3KHz

Remark

Standard

To Adjust

Pre-Setup

Item

Step

Pre-Setup
Condition

1) Deck 1:MTT-111

2) Press PLAY

SW button

3) Deck 2:Same

as above

AZIMUTH

1

SPK OUT

(VTVM is

connected to

the scope)

- Turn the control
screw to as shown
in Figure 1-6.

Max output
and same phase
(both channels)

After
adjustment
secure it with
REGION
LOCK.

Remark

Standard

To Adjust

Pre-Setup

Item

Step

Pre-Setup
Condition

After putting MTT-

114N into Deck 1

- Press FWD PLAY

button.

AZIMUTH

1

2

SPK OUT

(VTVM is

connected to

the scope)

- Turn the control
screw to as shown
in Figure 1-6.

Max output
and same phase
(both channels)

After
adjustment
secure it with
REGION
LOCK.

7mV(±0.5mV)

Turn JSR2L,JSR2R

to the right and left

Remark

Standard

To Adjust

Pre-Setup

Item

Step

Pre-Setup
Condition

Fig 1-8

After putting MTT-

114N into Deck 2

1)Press FWD PLAY

button.

After putting MTT-

5512 into Deck 2

1)Press REC PLAY

button.

2)MAIN PCB JCW3,

connectted to VTVM

Recording
Bias
Voltage

2-2 To Adjust PlayBack Level/REC

2. Adjust Deck 2 Play Level/REC BIAS

1. Adjust Deck 1 Play Level

Cassette Deck

output

SPK OUT

Frequency Counter

Figure 1-5

Figure 1-6

SPK OUT

Recording /Play head

AZIMUTH control screw

Figure 1-7

In Out

Cassette Deck

Oscilloscope

2 Cassette Deck

±1%

range

Figure 1-8

Audio OSC.

SET
(MAIN PCB)

Oscilloscope

AUX IN

LINE OUT

VTVM

IN

JCW3

IN OUT

TP

2.Exploded Views and Parts List

2-1 Auto Reverse Cassette Deck

Samsung Electronics 2-1

3

4

2

1

5

No. Code No. Description Specification Remarks

AH59-00122A ADR248BTR
1 AH81-00098A ASS,Y HEAD TR981PA MT91-11011S
2 AH81-00422A ASS,Y MOTOR CCM090L2 MT91-15013Y
3 AH81-00100A BELT MAIN ADR2400S-MAIN 6602-001037
4 AH81-00101A BELT FR ADR2400S-FR 6602-001055
5 AH81-00102A SOLENOID ADR2400-1 MT75-00049A

2-2 Total Exploded View and Parts List

Samsung Electronics

2-2

2-2-1 Parts List

1 AH64-01107A DECORATION-SHEET MM-L7,0.8,-,WHT, MML7
1 AH64-01107B DECORATION-SHEET MM-L7,0.8,-,WHT,” MM-ZL7
2 AH64-01105A DECORATION-DOOR CD MM-L7,ABS ,-,-,GRAY,­3 AH64-01109A DOOR-CD MM-L7,AS SAN,-,CLEAR,-,-,­4 AH64-01115A WINDOW-VFD MM-L7,PMMA,-,-,-,-,SMOKE,­5 AH64-01104A DECORATION-FRONT MM-L7,ABS ,-,-,GRAY,­5 AH64-01104B DECORATION-FRONT MM-L7,ABS ,-,-,GRAY,- MML7 RDS
5 AH64-01104C DECORATION-FRONT MM-L7,ABS ,-,-,GRAY,-” MMZL7
5 AH64-01104D DECORATION-FRONT MM-L7,ABS ,-,-,GRAY,-” MMZL7 RDS
6 AH64-01096B CABINET-FRONT MM-L7,BASIC,MIPS 94V2,-,GRY
7 AH61-00647A BRACKET-SIDE MM-L7,SECC ,T 1.0,-,­8 AH61-00644A HOLDER-ILLUMINATION MM-L7,ABS ,NI PL,-,-,­9 AH61-00637A HOLDER-GUIDE L MM-L7,ABS 94HB,GRAY,-,-,­10 AH61-00644B HOLDER-ILLUMINATION MM-L7,ABS ,NI PL,-,-,­11 AH66-00139A GEAR-SHAFT MM-L7,ABS,-,-,-,BLK,-,-,­12 AH61-00645A HOLDER-STOPPER MM-L7,ABS ,GRAY,-,-,­13 AH67-00100A LENS-REMOCON MM-L7,PMMA,SMOKE,-,-,-,­14 AH64-01113A KNOB-MAIN MM-L7,ABS ,-,SILVER,-,-,-,­15 AH64-01119A KNOB-POWER MM-L7,ABS ,-,NI PL,-,-,-,­16 AH64-01112A KNOB-FUNCTION MM-L7,ABS ,-,NI PL,-,-,-,­17 AH61-00649A SHAFT-GEAR MM-L7,MBS,-,-,­18 AH61-00638A HOLDER-GUIDE R MM-L7,ABS 94HB,GRAY,-,-,­19 3405-000101 LEAF-MICRO MLS-24
20 AH61-00733A BRACKET-GUIDE MM-L7,SECC ,T 1.0,-,­21 3405-000101 LEAF-MICRO MLS-24
22 AH92-00949A FRONT-PCB ASSY
23 AH92-00942A MAIN PCB ASSY
24 AH62-00040A HEAT SINK-MAIN MM-L7,AL,-,-,-,-,20W/CH,­25 AH61-00634A BRACKET-HEAT SINK MM-L7,SECC 1.0T,-,-,­26 AH26-00129A P/T
27 AH92-00950A POWER-PCB ASSY
28 AH64-01103A CABINET-BOTTOM MM-L7,BASIC,MIPS 94V2,-,GRY
29 AH39-00257A AC CORD
31 AH31-10021A MOTOR-DC RF-500TB, 9V DC1130mA
32 AH66-00114A PULLEY-MOTOR POM BLK
33 AH61-00636A HOLDER-GEAR MM-L7,ABS 94HB,GRAY,-,-,­34 AH66-00138A GEAR-C MM-L7,POM,-,-,-,BLK,-,-,­35 AH66-00063A BELT-PULLEY -,CR,-,-,-,BLK,S-2000
36 AH66-00137A GEAR-B MM-L7,ABS,-,-,-,BLK,-,-,­37 AH66-00136A GEAR-A MM-L7,POM,-,-,-,BLK,-,-,­38 AH64-01102A CABINET-SIDE R MM-L7,BASIC,MIPS 94V2,-,GRY
39 AH61-00210A CAP-CD ,ABS 94HB,-,BLK,-,S-2000
40 AH59-00106A DECK-PICK UP DA23L,MCD-MP65,BALL,-,-,-,DECK
41 AH73-00010A RUBBER—HOLDER BUTYLENE,-,S-2000,­42 AH92-00923A CD-PCB ASS’Y
43 AH61-00635A HOLDER-CD,DECK MM-L7,ABS 94HB,GRAY,-,-,­44 AH73-00007A RUBBER—MECHA A BUTYL,-,S-2000,­45 AH64-01095A CABINET-REAR MM-L7,BASIC,MIPS 94V2,-,GRY
46 AH64-01101A CABINET-SIDE L MM-L7,BASIC,MIPS 94V2,-,GRY
46 AH64-01101B CABINET-SIDE L S-3650,BASIC,MIPS 94V2,-,GRY
47 AH64-01116A WINDOW-CASSETTE MM-L7,PMMA,-,-,-,-,CLEAR,­48 AH64-01108A DOOR-CASS MM-L7,ABS L/GRAY,-,SILVER,-,-,
49 AH64-01232A DECORATION-TOP MM-L7,ABS,2.5,-,WHT,­50 AH64-01097A CABINET-TOP MM-L7,,MIPS 94V2,-,GRY NO MIC

No. Code No. Description Specification Remarks

Samsung Electronics

2-3

No. Code No. Description Specification Remarks

51 AH64-01114A KNOB-OPEN MM-L7,ABS ,-,NI PL,-,-,-,­53 AH59-00122A DECK-CASSETTE ADR248BTR,MM-L7,-,-,DC12V,-,-,
54 AH95-50001A ASSY-LATCH MAX555,
55 AH61-80030A DAMPER-ASSY -,POM,M0.8,G130,BLK,-,
56 AH61-00648A SPRING-EJECT MM-L7,SUS 304 WPB,PI 1.0,-,-,-