SAMSUNG MM-J4 Service Manual Alignment & Adjustment
1-1Samsung Electronics
1. Alignment and Adjustments
1-1. 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
FD
FM Search Level Adjustment
Adjust SVR1 so that “TUNED” of LCD 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
SVR1 (10KΩ)
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
10 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
AA
Figure1-3 AM I.F Adjustment
OUTPUT
* Adjustment Location of Tuner PCB
Fig 1-4 OSC Voltage
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)
LW OSC
Adjustment
146~290 KHz
LO
2~7.0±0.5V
LW RF
Adjustment
150 KHz
LA
Maximum
Output(Fig1-4)
1-2 Samsung Electronics
Alignment and Adjustments
(GND)
VTVM
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 SPK OUT of the MAIN PCB to the fre-
quency 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
SPK OUT
(connected
to the frequency
counter)
Fixed
3KHz
Remark
Standard
To Adjust
Pre-Setup
Item
Step
Pre-Setup
Condition
1) Deck :MTT-111
2) Press PLAY
SW button
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.
1
2
- Turn the control
screw to as shown in
Figure 1-6.
MAX OUTPUT
and same phase
(both channels)
CHECK TO
7mV(±0.5mV)
Remark
Standard
To Adjust
Pre-Setup
Item
Step
Pre-Setup
Condition
After putting MTT-
5512 into Deck 2
1) Press REC PLAY button.
2) TAPE PCB JCW3 ,connected
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
SPK OUT
Figure 1-7
In Out
MAIN PCB
Oscilloscope
2. Cassette Deck
±1%
range
Figure 1-8
Audio OSC.
SET
(MAIN PCB)
Oscilloscope
AUX IN
VTVM
IN
SPK OUT
IN OUT
TP
AZIMUTH
Figure 1-6
Recording /Play head
AZIMUTH control screw
(RVS Play)
AZIMUTH control screw
(FWD Play)
SPK OUT
(VTVM is con-
nected to the
scope)
Fig 1-8
- Turn JSR2L,JSR2R
to the right and left
After adjustment secure
it with
REGION
LOCK.
After putting MTT-
114N into Deck 2
- Press FWD PLAY
button.
MAIN PCB
output
SPK OUT
Frequency Counter
Figure 1-5
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