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
FM
Antenna
Terminal
Distortion Meter
Input
SET
Input
output
Oscilloscope
FM IN
FM Antenna
SET
5 k½
OUTPUT
AM SSG
450KHZ
INPUT
AM ANT
IN
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
FM
Antenna
Terminal
Distortion Meter
Input
SET
Input
output
Oscilloscope
FM IN
FM Antenna
SET
20 k½
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
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
MO
AM(MW)
RF
ITEAM
594 KHz
MA
Maximum
Output
(Fig1-4)
LW
OSC
146~290 KHz
LO
2~7.0±0.5V
AM(MW)
RF
150 KHz
LA
Maximum
Output
(Fig1-4)
SW1
OSC
2.3~7.3 MHz
LO
1~8V±1V
SW1
RF
3.5MHz
MA
Maximum
Output
(Fig1-4)
SW2
OSC
9.5~26.1MHz
LO
SW2
RF
10MHz
MA
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)
AM
(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
1
2
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
1
2
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
1
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.
6V
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
IN
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