Samsung MAX-B420 User manual

3 CD CHANGER

MINI MINI COMPONENT

MAX-B420

MAX-B450

MAX-ZB450

SERVICE Manual

MIMI MIMI COMPONENT SYSTEM 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

1-1Samsung Electronics

1. Alignment and Adjustments

1-1 Tuner : MAXB420/MAXB450

FM THD Adjustment

Output

Output 23 dB

60 dB

Minumum Distortion (0.3% below)

(Figure 1-1)

SSG FREQ.

Adjustment

point

(TL3)

98 MHz

FM DETECTOR COIL

FM Search Level Adjustment

Adjust TSR1 so that “TUNED” of FLT

is lighted (Figure 1-2)

Figure1-2 FM Auto Search Level Adjustment

*Adjust FM S.S.G level to 23dB

Figure1-1 IF CENTER and THD Adjustment

SSG FREQ.

Adjustment

point

(TSR1)

98 MHz

BEACON

SENSITIVITY

SEMI-VR(5K½)FM S.S.G GND

23 dB

FM S.S.G

Output

GND

Speaker

Terminal

Antenna

Terminal

Distortion Meter

Input

SET

Input

output

Oscilloscope

FM IN

FM Antenna

SET

5 k½

OUTPUT

AM SSG

450KHZ

INPUT

AM ANT

Speaker Terminal

60cm

TL2

VTVM Oscilloscope

AM(MW) I.F Adjustment

Maximum output (Figure 1-3)

SSG FREQ.

Frequency

Adjustment

point

(TL2)

450 kHz

522 kHz

AM I.F COIL

Figure1-3 AM I.F Adjustment

OUTPUT

* Adjustment Location of SW Band

* Adjustment Location of LW Band

Alignment and Adjustments

1-2 Samsung Electronics

1-2. Tuner: MAXZB450

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(10K½)FM S.S.G GND

28 dB

FM S.S.G

Output

GND

Speaker

Terminal

Antenna

Terminal

Distortion Meter

Input

SET

Input

output

Oscilloscope

FM IN

FM Antenna

SET

20 k½

OUTPUT

AM SSG

450KHZ

INPUT

AM ANT

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±0.5V

Received FREQ.

Adjustment

point

522~1611 KHz

AM(MW)

ITEAM

594 KHz

Maximum

Output

(Fig1-4)

OSC

146~290 KHz

2~7.0±0.5V

AM(MW)

150 KHz

Maximum

Output

(Fig1-4)

SW1

OSC

2.3~7.3 MHz

1~8V±1V

SW1

3.5MHz

Maximum

Output

(Fig1-4)

SW2

OSC

9.5~26.1MHz

SW2

10MHz

Maximum

Output

(Fig1-4)

1~8V±1V

Alignment and Adjustments

1-3Samsung Electronics

1-3 AM(MW),LW,SW1,SW2 Adjustment

Circuit Measuring Instrument & Step S.S.G Radio dial Adjusting Adjust for

to be Arrangement Frequency Setting Point

Adjusted

1 522KHz 522KHz MW OSC Aduust for 1.0V±0.1V at the low.

OSC Connect AM signal (IR117)

generator to loop

antenna,VTVM AND

oscilloscope 2 1611KHz 1611KHz MW OSC Check for 7.0V±1.0V at the high.

(Fig 1-3) (IR117)

(MW) RF “ 1 594KHz 594KHz MW ANT Maximum out

INTER FREQ “ 1 455KHz 522KHz TL2 Maximum out

OSC Fig 1-3 1 146KHz LW OSC Aduust for 2.0V±0.1V at the low.

LW 2 290KHz LW OSC Check for 7.0V±1.0V at the high.

RF 1 150KHz 150KHz LW ANT Maximum out

OSC Fig 1-3 1 2.3MHz SW1 OSC Aduust for 1.0V±0.1V at the low.

SW1 2 7.3MHz - Check for 8.5V±1.0V at the high.

RF 1 3.5MHz 3.5MHz SW1 ANT Maximum out

OSC Fig 1-3 1 9.5MHz SW2 OSC Aduust for 1.5V±0.1V at the low.

SW2 2 26.1MHz - Check for 8.0V±1.0V at the high.

RF 1 10MHz 10MHz SW2 ANT Maximum out

Alignment and Adjustments

1-4Samsung Electronics

(GND)

VTVM

1-2-1 To 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 1-4.

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

head.

2) Measuring tape :

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

ii) MTT-112(or equivalent) :

3) The cassette deck is connections as shown in figure 1-6.

Notes Notes

NORMAL

SPEED

Control

1OUT

(connected

to the frequency

counter)

Turn

UVR1(420,45

0) to left and

right

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:MTT-5512

AZIMUTH

SPK OUT

(VTVM is

connected to

the scope)

1) Turn the control

screw to as shown

in Figure 1-5.

Max output

and same phase

(both channels)

After

adjustment

secure it with

REGION

LOCK.

Adjust to level

and same as

R-CH.

L-CH:Turn Fixed

to the right and

left

R-CH : fixed.

See the

diagram for

adjustment

locations.

Remark

Standard

To Adjust

Pre-Setup

Item

Step Pre-Setup

Condition

Same as

above

After putting MTT-

114 into Deck 1

1)Press PLAY button.

PLAY MTT-112

on Deck 1.

PlayBack

out Level

AZIMUTH

SPK OUT

(VTVM is

connected to

the scope)

1) Turn the control

screw to as shown

in Figure 1-5.

Max output

and same phase

(both channels)

After

adjustment

secure it with

REGION

LOCK.

Check level

and same as

Deck1 level

No Adjustment See the

diagram for

adjustment

locations.

Remark

Standard

To Adjust

Pre-Setup

Item

Step Pre-Setup

Condition

Same as

above

After putting MTT-

114 into Deck 2

1)Press PLAY button.

PLAY MTT-150

on Deck 2.

PlayBack

out Level

1-2-2 To Adjust PlayBack Level

@ Adjust Deck 2 Play Level

! Adjust Deck 1 Play Level

Cassette Deck

output

SPK OUT

Frequency Counter

Figure 1-4

Figure 1-5

SPK OUT

Recording /Play head

AZIMUTH control screw

Figure 1-6

In Out

SET Oscilloscope

1-4 Cassette Deck

REC

Bias

Voltage

Connect to

DCW2 as in

Fig.1-7 and read

the VTVM.

L-CH;FR52(420),TVR2(450)

and R-

CH;FR52(420),TVR2(450)to

the right and

left.

Remark

Standard

To Adjust

Pre-Setup

Item

Step Pre-Setup

Condition

Input MTT-5512

into Deck2,then

press REC button.

See diagram

for adjustment

location

Adjust REC Bias Voltage

Figure 1-7

SET

Oscilloscope

VTVM

JCW3

Samsung Electronics 6-1

6. Wiring Diagram : MAX-B420

6-2 Samsung Electronics

6-1. Wiring Diagram : MAX-B450/ZB450

Samsung Electronics 5-1

5. Printed Circuit Board Diagram

5-1 MAIN : MAX-B420

5-2 Samsung Electronics

5-2 MAIN : MAX-B450/ZB450

Samsung Electronics 5-3

5-3 FRONT MAX-B420

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