Samsung MM-16 User manual

©Samsung Electronics Co., Ltd. Aug. 1996. Code No. AH68-20128A
MICRO COMPONENT SYSTEM
1. Precautions
2. Specifications
3. Disassembly and Reassembly
4. Alignment and Adjustments
5. Special Circuit Descriptions
6. Troubleshooting
7. Exploded Views and Parts List
8. Electrical Parts List
9. Block Diagrams
10. PCB Diagrams
11. Wiring Diagram
12. Schematic Diagrams
POWER
SUPER BASS
VOLUME
DOWN UP
ON/STANDBY
CD REPEAT A ↔B
PHONEG
EQ PRESET
TAPE
CD
BAND
TUNER
AUX
TUNING
SERVICE Manual
MICRO COMPONENT
SYSTEM
MM-16
CONTENTS

1. Precautions
Follow these safety, servicing and ESD precautions to prevent damage and protect against potential hazards
such as electrical shock and X-rays.
Samsung Electronics 1-1
1-1 Safety Precautions
1. Be sure that all of the built-in protective
devices are replaced.
2. When reinstalling the chassis and its
assemblies, be sure to restore all protective
devices, including control knobs and
compartment covers.
3. Make sure that there are no cabinet
openings through which people--
particularly children--might insert fingers
and contact dangerous voltages. Such
openings include the spacing between the
picture tube and the cabinet mask,
excessively wide cabinet ventilation slots,
and improperly fitted back covers.
4. Design Alteration Warning:
Never alter or add to the mechanical or
electrical design of the unit. Example: Do
not add auxiliary audio or video connec-
tors. Such alterations might create a safety
hazard. Also, any design changes or addi-
tions will void the manufacturer's warran-
ty.
5. Leakage Current Hot Check (Figure 1-1):
Warning: Do not use an isolation
transformer during this test. Use a leakage-
current tester or a metering system that
complies with American National Standards
Institute (ANSI C101.1, Leakage Current for
Appliances), and Underwriters Laboratories
(UL Publication UL1410, 59.7).
With the unit completely reassembled, plug
the AC line cord directly into a 120V AC
outlet. With the unit's AC switch first in
the ON position and then OFF, measure the
current between a known earth ground
(metal water pipe, etc.) and all exposed
metal parts. Examples: Handle brackets,
metal cabinets, screwheads and control
shafts. The current measured should not
exceed 0.5 milliamp. Reverse the power-
plug prongs in the AC outlet and repeat.
6. Insulation Resistance Cold Check:
(1) With the unit's AC plug disconnected
from the AC source, connect an electrical
jumper across the two AC prongs. (2) Set
the power switch to ON. (3) Measure the
resistance between the shorted AC plug and
any exposed metallic parts. Example:
Screwheads, antenna, control shafts or
handle brackets.
If any of the exposed metallic parts has a
return path to the chassis, the measured
resistance should be between 1 and 5.2
megohms. If there is no return path, the
measured resistance should be "infinite." If
the resistance is outside these limits, a shock
hazard might exist. See Figure 1-2
Device
Under
Test
(Reading should
not be above
0.5mA)
Leakage
Currant
Tester
Earth
Ground
Test all
exposed metal
surfaces
Also test with
plug reversed
(using AC adapter
plug as required)
2-Wire Cord
Antenna
Terminal
Exposed
Metal Part
ohm Ohmmeter
Fig. 1-1 AC Leakage Test
Fig. 1-2 Insulation Resistance Test

Samsung Electronics1-2
1-1 Safety Precautions (Continued)
7. Components, parts and wiring that appear
to have overheated or that are otherwise
damaged should be replaced with parts
that meet the original specifications.
Always determine the cause of damage or
overheating, and correct any potential
hazards
8. Observe the original lead dress, especially
near the following areas: Antenna
wiring, sharp edges, and especially the
AC and high voltage power supplies.
Always inspect for pinched, out-of-place,
or frayed wiring. Do not change the
spacing between components and the
printed circuit board. Check the AC
power cord for damage. Make sure that
no wires or components touch thermally
hot parts.
9. Product Safety Notice:
Some electrical and mechanical parts
have special safety-related characteristics
which might not be obvious from visual
inspection. These safety features and the
protection they give might be lost if the
replacement component differs from the
original--even if the replacement is rated
for higher voltage, wattage, etc.
10 Components that are critical for safety are
indicated in the circuit diagram by
shading, or . Use replacement
components that have the same ratings,
especially for flame resistance and
dielectric strength specifications. A
replacement part that does not have the
same safety characteristics as the original
might create shock, fire or other hazards.
1-2 Servicing Precautions
1. Servicing precautions are printed on the
cabinet. Follow them.
2. Always unplug the unit's AC power cord
from the AC power source before
attempting to: (a) Remove or reinstall any
component or assembly, (b) Disconnect an
electrical plug or connector, (c) Connect a
test component in parallel with an
electrolytic capacitor.
3. Some components are raised above the
printed circuit board for safety. An
insulation tube or tape is sometimes used.
The internal wiring may be clamped to
prevent contact with thermally hot
components. Reinstall all such elements to
their original position.
4. After servicing, always check that the
screws, components and wiring have been
correctly reinstalled. Make sure that the
portion around the serviced part has not
been damaged.
5. Check the insulation between the blades of
the AC plug and accessible conductive parts
(examples: metal panels, input terminals
and earphone jacks).
6. Insulation Checking Procedure: Disconnect
the power cord from the AC source and
turn the power switch ON. Connect an
insulation resistance meter (500V) to the
blades of the AC plug.
The insulation resistance between each
blade of the AC plug and accessible
conductive parts (see above) should be
greater than 1 megohm.
7. Never defeat any of the B+ voltage
interlocks. Do not apply AC power to the
unit (or any of its assemblies) unless all
solid-state heat sinks are correctly installed.
8. Always connect a test instrument's ground
lead to the instrument chassis ground
before connecting the positive lead; always
remove the instrument's ground lead last.
Precautions
Warning1: First read the "Safety Precautions" section of this manual. If some unforeseen circumstance creates a conflict
between the servicing and safety precautions, always follow the safety precautions.

Samsung Electronics 1-3
1-3 Precautions for Electrostatically Sensitive Devices (ESDs)
1-4 Special Precautions and Warning Labels for Laser Products
1. Some semiconductor ("solid state") devices
are easily damaged by static electricity.
Such components are called Electrostatically
Sensitive Devices (ESDs). Examples include
integrated circuits and some field-effect
transistors. The following techniques will
reduce the occurrence of component
damage caused by static electricity.
2. Immediately before handling any
semiconductor components or assemblies,
drain the electrostatic charge from your
body by touching a known earth ground.
Alternatively, wear a discharging
wrist-strap device. (Be sure to remove it
prior to applying power--this is an electric
shock precaution.)
3. After removing an ESD-equipped assembly,
place it on a conductive surface such as
aluminum foil to prevent accumulation of
electrostatic charge.
4. Do not use freon-propelled chemicals.
These can generate electrical charges that
damage ESDs.
5. Use only a grounded-tip soldering iron
when soldering or unsoldering ESDs.
6. Use only an anti-static solder removal
device. Many solder removal devices are
not rated as "anti-static" (these can
accumulate sufficient electrical charge to
damage ESDs).
7. Do not remove a replacement ESD from its
protective package until you are ready to
install it. Most replacement ESDs are
packaged with leads that are electrically
shorted together by conductive foam,
aluminum foil or other conductive
materials.
8. Immediately before removing the protective
material from the leads of a replacement
ESD, touch the protective material to the
chassis or circuit assembly into which the
device will be installed.
9. Minimize body motions when handing
unpackaged replacement ESDs. Motions
such as brushing clothes together, or lifting
a foot from a carpeted floor can generate
enough static electricity to damage an ESD.
Precautions
UL : Manufactured for U.S.A. Market.
CSA : Manufactured for Canadian Market.
EU : Manufactured for European Market.
SCAN : Manufactured for Scandinavian
Market.
This Product Complies with
DHHS Rules 21CFR, Sub
chapter J.At date of Manu-
facture
(UL)
(SCAN)
(EU)
CERTIFIED ONLY TO CANADIAN
ELECTRICAL CODE.
CERTIFIE EN VERTU DU CODE
CANADIAN DE LELETRICITE
SEULEMENT
(CSA)
CLASS 1
LASER PRODUCT
(EU)
Fig. 1-3 Warning Labels (Location: Enclosure Block)
Fig. 1-4 Warning Labels (Location: Disc Clamper, Inner Side of Unit Door or Nearby Unit Chassis )
CAUTION : INVISIBLE LASER RADIATION WHEN OPEN
AND INTERLOCKS DEFEATEO AVOIDEXPOSURE TO BEAM
ADVARSEL: USYNLIG LASERSTRÅLING VED ABNING
NÅR SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION
UNDGA UDSAETTELSE FOR STRALING
VARO:AVATTAESSA JA SUOJALUKITUS OHITETTAESSA
OLET ALTTINA NAKYMATTÖMALLE LASERSATEILYLLE ALA
KATSO SATEESEEN!
VARNING:OSYNLIG LASERSTRÅLNING NAR DENNA DEL
AR OPPNAD OCH SPARREN AR URKOPPLAD BETRAKTA
EJSTRÅLEN!

Samsung Electronics1-4
1-4 Special Precautions and Warning Labels for Laser Products (Continued)
1-4-1 Warnings
1. When servicing, do not approach the LASER
exit with the eye too closely. In case it is
necessary to confirm LASER beam emission,
be sure to observe from a distance of more
than 30 cm from the surface of the objective
lens on the optical pick-up block.
2. Do not attempt to handle the objective lens
when the DISC is not on the tray.
1-4-2 Laser Diode Specifications
Material: GaAs+ GaAlAs
Wavelength: 760-800 nm
Emission Duration: Continuous
Laser Output: 0.2 mw (measured at a
1.6 mm distance from the objective lens
surface on the optical pick-up block.)
1-4-3 Handling the Optical Pick-up
1. Static electricity from clothing or the body
may cause electrostatic breakdown of the
laser diode in the Optical Pickup. Follow
this procedure:
2. Place a conductive sheet on the work bench
(i.e., the black sheet used for wrapping
repair parts.) Note: The surface of the work
bench should be covered by a copper
ground plane, which is grounded.
3. The repair technician must wear a wrist
strap which is grounded to the copper sheet.
4. To remove the Optical Pickup block:
Place the set on the conductive sheet, and
momentarily touch the conductive sheet
with both hands. (While working, do not
allow any electrostatic sources--such as
clothes--to touch the unit.)
5. Ground the "Short Terminal" (located on the
PCB, inside the Pickup Assembly) before
replacing the Pickup. This terminal should
be shorted whenever the Pickup Assembly
is lifted or moved.
6. After replacing the Pickup, reopen the Short
Terminal. See diagrams below:
Precautions
THE UNIT
(1) WRIST-STRAP
FOR GROUNDING 1M
1M
CONDUCTIVE SHEET
short
terminal short terminal short
terminal short
terminal
SOH91VI(LDP) SOH91CI(CAR,walkman) SOH94T4N
(CMS-V10,CMS-V30)
SOH-A1
(CMS-V10,CMS-V30)

Power source
Power consumption
Dimensions (mm)
AC 115/230V 50/60Hz
(Option)
30W
162(W)x280(H)x278(D)
Power output
Total harmonic distortion
Frequency range
Signal to noise ratio
Channel separation
Frequency range
Usable sensitivity
Signal to noise ratio
IF rejection ratio
Total harmonic distoration
Separation (Stereo)
Frequency range
Usable sensitivity
Signal to noise ratio
IF rejection ratio
Total harmonic distoration
Frequency range
Usable sensivity
Signal to noise ratio
Frequecny range
WOW FLUTTER
Erasing effect
Signal to noise ratio
Total harmonic distortion
Frequency response
Signal to noise ratio
Channel separation
Total harmonic distortion
87.5 ~ 108MHz
6µV
55dB
60dB
0.5%
25dB
522 ~ 1611KHz
600µV
40dB
30dB
1%
146 ~ 290KHz
1200µV
35dB
125Hz ~ 12.5KHz
0.15%
50dB
40dB
2.5%
20Hz ~ 20KHz(¡1dB)
85dB(1kHz 0dB)
75dB(1kHz 0dB)
0.1%(1kHz 0dB)
5W/CH
0.5%
50Hz ~ 17kHz
60dB
45dB
General
Amp
Tuner
Cassette
Compact Disc
FM
MW
LW
Samsung Electronics 2-1
* Specifications are subject to change without notice.
2. Specifications

* Remote Control
EQ PRESET MUTE
MONO/ST
AUX
POWER
PLAY/PAUSE
VOLUME
TUNING TUNING
INTRO
RANDOM MEMORY BAND
SLEEP PRESET/MANUAL
CLOCK TIMER
TUNER
SKIP/SEARCH STOP
REPEATDISPLAYPROGRAM
TAPE CD
VOLUME
FUNCTION

3. Disassembly and Reassembly
3-1 Cabinet-Top, Cabinet-Rear
1. Remove 8 screws of ! and 5 screws of @of its rear part.
2. Pull its top part upward vertically as shown in the figure 3-1.
1
1
1
1
2
2
2
2
Samsung Electronics 3-1
Figure 3-1

3-2 Main-PCB
1. Remove 1 screw of ! and pull out the Main-PCB backward horizontally.
3-2 Samsung Electronics
1
Main-PCB
Figure 3-2
Disassembly and Reassembly

3-4 CD-Pack
1. Undo 4 screws of ! and then remove the CD-Pack downward.
3-3 Main-PCB
1. Remove 3 screws of ! and pull it out backward.
1
Samsung Electronics 3-3
Figure 3-3
Figure 3-4
11
Disassembly and Reassembly

3-5 CD Deck
1. Remove the Shaft !.
2. Lift the P/U @.
Note : Take extreme care not to touch the surface of lens.
3. Lift the Center-knob #.
4. Remove the Center-ring $.
5. Remove the Spring-T/Table %.
6. Remove the Turn-Table (M) ^.
7. Remove 2 screw &and then remove the Spindle-Motor *.
8. Remove the Cover-Gear (by pushing the hook.
9. Remove the Gear(c) )by pushing the hook.
10. Lift the Gear(b) 1.
11. Remove the Gear(a) 2.
12. Remove 2 screws 3and then remove the Feed-Motor 4.
13. Remove the Chassis-Deck(M) 5.
4
6
713
21
9
10
11
12
14
15
8
3
5
3-4 Samsung Electronics
Figure 3-5
Disassembly and Reassembly

4. Alignment and Adjustments
4-1 Tuner
FM T.H.D Adjustment
SSG FREQ. 98MHz
Adjustment
point FM DETECTOR COIL
(IT1)
Minumum output(Figure 4-1)
FM Search Level Adjustment
SSG FREQ. 98MHz
Adjustment
point SEMI-VR(50KB)
(ISVR1)
"TUNED" is shown on LCD(Figure 4-2)
FM
Antenna
Terminal
Speaker
Terminal
Input
Input
Figure 4-1 IF CENTER and T.H.D Adjustment
Figure 4-2 FM Auto Search Level Adjustment
Output
Distortion Meter
Oscilloscope
Oscilloscope
FM antenna
FM SSG
FM SSG GND
26dB
75Ω
Dummy
75Ω
Dummy
FM IN
FM Antenna
SET
50 kB
SET
Output
GND
FM Stereo Adjustment
SSG FREQ. 98MHz
Adjustment
point SEMI-VR(5KB)
(ISVR2)
L-CH/R-CH : Maximum(Figure 4-3)
Figure 4-3 FM Stereo Separation Adjustment
EXT
FM
SSG
Stereo
Modulator
(Pilot 10%)
Speaker
terminal
SET
GND
OUT
VTVM
5KB
4-1Samsung Electronics

Samsung Electronics4-2
Step Item Connection SSG.FREQ. FREQ. Setting Adjust. Point Remark
Maximum
output
Maximum output
Maximum output
1
Intermediate
frequency (IF)
adjustment
AM frequency
coverage
adjustment
Figure 4-5
Figure 4-4
Connect DC
voltmeter to TCON1
and GND(TP1)
522 KHZ 522 KHZ IT 2
OT 1
OCT 2
OL 1
OCT 1
9V
0.9V
522 KHZ
594 KHZ
1404 KHZ
1611 KHZ
594 KHZ
1404 KHZ
Figure 4-5
_
_
_
Repeat step 2 and 3 serveral times
Repeat step 5 and 6 several times
AM tracking
adjustment
Figure 4-4 AM Frequecny Coverage Adjustment
Figure 4-5 AM Tracking Adjustment
SET
TP2 DC Voltmeter
Input
TP1
AM Signal
Generator Test Loop
Antenna AM
Loop Antenna
Jack
Speaker
terminal
GND
Oscilloscope
VTVM
IN OUT
SET
60 cm
Alignment and Adjustments
2
3
4
5
6
7
4-1-1 Test Equipment
1. AM Standard Signal Generator (S.S.G) : 400Hz, 30% MOD
2. Oscilloscope
3. VTVM
4. Frequency counter
5. Loop antenna
6. Dummy load (4½)
7. DC voltmeter
4-1-2 Pre-Adjustment
1. Check the source voltage.
2. Set function and band switches to the band to be aligned.
3. Set the equalizer, volume and balance controls to mid position.
4-1-3 AM Adjustment

Alignment and Adjustments
Figure 4-6
Figure 4-7
Figure 4-8
4-2-1 Additional Test Equipment : Testing Tape
1. MTT-111 (or equivalent) : Test tape on which 3 KHz signal is recorded (Tape speed adjustment).
2. MTT-113CN (or equivalent) : Test tape on which 8KHz signal is recorded (Azimuth adjustment).
4-2-2 Recording Bias Adjustment
1. Connect frequency counter KC434 and press the REC button.
2. Adjust KT431(Bias OSC Coil) until frequency counter reads 85¡0.2KHz.
Item Connection Preparation
Tape speed
Figure 4-6
Figure 4-8
3 KHz
SVR
Inside motor
AZIMUTH
(DECK)
adjustment
Maximum output and
identical phase of L,R
channel.
Set the screw
after adjustment.
Insert MTT-111 to
Deck .
Press PLAY button.
Insert MTT-113CN
to Deck .
Press PLAY button. Figure 4-7
AZIMUTH Adjustment
Screw
REC PB Head
Oscilloscope
IN OUT
IN
SET
Frequency
Counter
Speaker
Terminal
Speaker
Terminal
Remark
Adjustment point
SET
(GND)
VTVM
V H
4-2 Cassette Deck
Samsung Electronics 4-3
Fixed Screw

Samsung Electronics4-4
4-3 CD
TP2
TP1
Vref
NVR1704 NVR1703 NVR1702 NVR1701
TE CENTER FE CENTER E.F BAL F.BIAS
0V
A
B
A=B
---100mV
---0V
---250mV
---0 V
---100mV
---0 V ---0 V ---0 V
---0 V
4-3-1 To Adjust FOCUS BIAS(STOP mode)
4-3-3 To Adjust Focus Gain (PLAY mode)
4-3-2 To Adjust Tracking Gain (PLAY mode)
4-3-4 To Adjust E/F Balance (PLAY mode)
1. Set Volt/Div of the oscilloscope to DC 100mV.
2. Ground the scope input and set the waveform to 0V, DC range.
3. Connect the GND terminal of the oscilloscope to
Vref, and (+) terminal to center of TP1.
4. Set NVR1701 to 0mV.
1. Connect the GND terminal of the oscilloscope to Vref and (+) terminal to TP2.
2. Load and play the disc
3. While the disc is running adjust the gain with NVR1704 as shown below.
1. Connect the GND terminal of the oscilloscope to Vref and (+) terminal to TP1.
2. Load and play the disc
3. While the disc is running adjust the gain with NVR1703 as shown in the following figure.
VOLT/DIV : 0.2V
TIME/DIV : 2mS
Normal frequency
Normal frequency Low frequency High frequency
Low frequency High frequency
VOLT/DIV : 0.1V
TIME/DIV : 2mS
VOLT/DIV : 0.1V
TIME/DIV : 2mS
VOLT/DIV : 0.1V
TIME/DIV : 2mS
VOLT/DIV : 0.2V
TIME/DIV : 2mS
VOLT/DIV : 0.2V
TIME/DIV : 2mS
1. Set TIME/DIV of the oscilloscope to 2mS.
2. Set Volt/DIV of the oscilloscope to 0.5V.
3. Ground the scope input and set to DC
and then set the DC range.
4. Connect the GND terminal of the oscilloscope to Vref
and (+) terminal to center to TP2.
5. Load and play the disc.
6. Turn NVR1704 counterclockwise to the minimum value.
7. Raise NVR1702 and adjust the waveform so that its middle
comes to GND of the oscilloscope (or until the upper half
of waveform becomes symmetrical to the bottom half, A=B)
8. Adjust NVR1704 (arrow) for normal sound.
Alignment and Adjustments

6. Troubleshooting
6-1 Main
6-1-1 Power Malfunction
Samsung Electronics 6-1
Yes
No
Yes
No
Yes
No
No
Yes
LCD lamp is ON Power Transistor
(RQ705) & fuse normal
Pins 73,31 of
UIC1(LC72362)
is at 5V
Connection
and soldering
of SCON1-UCON1
are normal
Check Voltage at RIC1
Replace RQ702,RQ703
Replace RQ701
Voltages at
RQ702,RQ703
are normal
Voltage at
RQ701 is normal

6-2 Samsung Electronics
Troubleshooting
Yes
No
Yes
No
No
6-1-2 FM No Sound
6-1-3 AM No Sound
Voltages at
IIC1(LA1851N) and semi
conductors tuner section
are normal
Voltage at power supply
section
Check pump charge circuitry(OQ5)
connection or soldering of SCON1-
UCON1,FCON1 soldering of pin 77 of
LC72362
TCON1 is at
1.5V¡0.5 on low coverage
7.5V ¡0.5 on high
coverage
Replace FET
Voltage at FET are
normal
Yes
No
No Check pump charge circuitry
(OQ5) connection of SCON1,
UCON1 soldering of pin77
of LC72362N
Yes
Voltage
at LA1851N(IIC1) and tuner
semi conductors are normal
(Refer to Schematic Diagram)
Voltage between
TCON1: AM(MW)
Low coverage 0.9V 0.1
High coverage 9V 0.5
LW Low coverage 0.7V 0.1
High coverage 4.5V 0.5
Check loop antenna soldering and
connection of OL1, OL2, OT1,OT2, IT2
Check voltage at power
supply section

Samsung Electronics 6-3
Troubleshooting
Yes
No
Yes No
Yes
No
Connection and soldering of head
wire normal Replace JIC1 (KA22291)
Voltage at
JIC1(KA22291) are normal
(Refer to Schematic
Diagram)
Check power supply circuitry
Noise occurs at
pin3,22 with volume
control at mid position Noise occurs at pins1,24
Check function selector
section
6-1-4 Tape Not Playing
6-1-5 Audio Output Problem
No
Yes
Yes
Yes
No
Speaker connections are normal
all pins of AIC1(TA8207)
are normal (Refer to Schematic
Diagram)
Voltage at base of AQ601,
AQ651(C945) is less than
0.6V
Pattern & Speaker Jack normal
Check power supply section
Check Muting circuitry
Voltages to

6-4 Samsung Electronics
Check Door S/W voltage.
CLOSE condition : 0V
Is Focus Search done properly ? Check oscillation of NXF100
(16.9344MHz).
Does Laser function during
Focus Search ? Replace PICK-UP.
Check NIC9282 pin73 voltage Replace NIC9282.
Yes
POWER ON
Check Door S/W
Replace NIC9220 or NIC9258.
during Focus Search : 5V
Yes
Yes
No
No
No
No
Yes
Yes
6-2 CD
6-2-1 Malfunction of DISC Revolution
Troubleshooting

Samsung Electronics 6-5
Troubleshooting
Check voltage of NIC05
Check waveform of NIC9282 No Check NIC9282 soldring conditon
Check waveform of NIC9270
pins 9,12
Check waveform of NIC9270
Replace NIC05
Check Amp. operation
Malfunction of Audio output
pins 19,20
Replace NIC9270
Check NIC9270 soldering condition
Replace NIC9270
Check NIC9270 soldering condition
Yes
Yes
Yes
Yes
Yes
No
No
No
pins 2,19
6-2-2 Malfunction of Audio output