Nad T-517-C Service Manual
SERVICE MANUAL
MODELS : T517C/T517CT SERVICE MANUAL
© NAD 2008
NAD ELECTRONICS INTERNATIONAL
TORONTO
SERVICE MANUAL
T517AH/T517AHT
T517C/T517CT/
DVD VIDEO PLAYER
T517C/T517CT/
T517C/T517CT
DVD VIDEO PLAYER
T517AH/T517AHT
DVD VIDEO PLAYER
CONTENTS
SECTION 1.........SUMMARY
SECTION 2.........CABINET & MAIN CHASSIS
SECTION 3.........ELECTRICAL
SECTION 4.........MECHANISM (DP-12V)
SECTION 5.........REPLACEMENT PARTS LIST
SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR DVD PRODUCTS..................................1-3
SERVICING PRECAUTIONS....................................................................................................................1-4
• GENERAL SERVICING PRECAUTIONS
• INSULATION CHECKING PRODEDURE
• ELECTROSTATICALLY SENSITIVE (ES) DEVICES
THE PROCESS OF DISC DOWNLOAD ...............................................................................................1-5
SPECIFICATIONS ........................................................................................................................................1-7
1-2
PRODUCT SAFETY SERVICING GUIDELINES FOR DVD PRODUCTS
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-video service
technicians.
When servicing this product, under no circumstances should the original design be
modified or altered without permission from NAD. All components should be replaced
only with types identical to those in the original circuit and their physical location, wiring
and lead dress must conform to original layout upon completion of repairs.
Special components are also used to prevent x-radiation, shock and fire hazard.
These components are indicated by the letter “x” included in their component
designators and are required to maintain safe performance. No deviations are allowed
without prior approval by NAD.
Circuit diagrams may occasionally differ from the actual circuit used. This way,
implementation of the latest safety and performance improvement changes into the set
are not delayed until the new service literature is printed.
CAUTION
customized installations without manufacturer’s approval. Unauthorized modifications
will not only void the warranty, but may lead to property damage or user injury.
Service work should be performed only after you are thoroughly familiar with these
safety checks and servicing guidelines.
GRAPHIC SYMBOLS
SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock. After the
original service problem has been corrected, make a check of the following:
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of adjacent
2. Verify that all protective devices such as insulators, barriers, covers, shields, strain
3. Soldering must be inspected to discover possible cold solder joints, solder splashes,
4. Check for physical evidence of damage or deterioration to parts and components,
5. No lead or component should touch a high current device or a resistor rated at 1 watt
6. After reassembly of the set, always perform an AC leakage test on all exposed
: Do not attempt to modify this product in any way. Never perform
The exclamation point within an equilateral triangle is intended to alert
the service personnel to important safety information in the service
literature.
The lightning flash with arrowhead symbol within an equilateral triangle
is intended to alert the service personnel to the presence of noninsulated
“dangerous voltage” that may be of sufficient magnitude to constitute a
risk of electric shock.
The pictorial representation of a fuse and its rating within an equilateral
triangle is intended to convey to the service personnel the following fuse
replacement caution notice:
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF
FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND RATING
AS MARKED NEAR EACH FUSE.
component shorts. This is especially important on items trans-ported to and from the
repair shop.
reliefs, power supply cords, and other hardware have been reinstalled per the
original design. Be sure that the safety purpose of the polarized line plug has not
been defeated.
or sharp solder points. Be certain to remove all loose foreign particles.
for frayed leads or damaged insulation (including the AC cord), and replace if
necessary.
or more. Lead tension around protruding metal surfaces must be avoided.
metallic parts of the cabinet (the channel selector knobs, antenna terminals, handle
and screws) to be sure that set is safe to operate without danger of electrical shock.
DO NOT USE ALINE ISOLATION TRANSFORMER DURING THIS TEST. Use an
AC voltmeter having 5000 ohms per volt or more sensitivity in the following manner:
Connect a 1500 ohm, 10 watt resistor, paralleled by a .15 mfd 150V AC type
capacitor between a known good earth ground water pipe, conduit, etc.) and the
exposed metallic parts, one at a time. Measure the AC voltage across the
combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by
using a non-polarized adaptor and repeat AC voltage measurements for each
exposed metallic part. Voltage measured must not exceed 0.75 volts RMS. This
corresponds to 0.5 milliamp AC. Any value exceeding this limit constitutes a potential
shock hazard and must be corrected immediately.
TIPS ON PROPER INSTALLATION
1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf
space over, or close to, a heat duct, or in the path of heated air flow.
2. Avoid conditions of high humidity such as: outdoor patio installations where dew is a
factor, near steam radiators where steam leakage is a factor, etc.
3. Avoid placement where draperies may obstruct venting. The customer should also
avoid the use of decorative scarves or other coverings that might obstruct ventilation.
4. Wall- and shelf-mounted installations using a commercial mounting kit must follow
the factory-approved mounting instructions. A product mounted to a shelf or platform
must retain its original feet (or the equivalent thickness in spacers) to provide
adequate air flow across the bottom. Bolts or screws used for fasteners must not
touch any parts or wiring. Perform leakage tests on customized installations.
5. Caution customers against mounting a product on a sloping shelf or in a tilted
position, unless the receiver is properly secured.
6. A product on a roll-about cart should be stable in its mounting to the cart.
Caution the customer on the hazards of trying to roll a cart with small casters across
thresholds or deep pile carpets.
7. Caution customers against using extension cords. Explain that a forest of
extensions, sprouting from a single outlet, can lead to disastrous consequences to
home and family.
1-3
SERVICING PRECAUTIONS
CAUTION: Before servicing the DVD covered by this service
data and its supplements and addends, read and follow the
SAFETY PRECAUTIONS. NOTE: if unforeseen circumstances
create conflict between the following servicing precautions
and any of the safety precautions in this publication, always
follow the safety precautions.
Remember Safety First :
General Servicing Precautions
1. Always unplug the DVD AC power cord from the AC power
source before:
(1) Removing or reinstalling any component, circuit board,
module, or any other assembly.
(2) Disconnecting or reconnecting any internal electrical
plug or other electrical connection.
(3) Connecting a test substitute in parallel with an
electrolytic capacitor.
Caution: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an
explosion hazard.
2. Do not spray chemicals on or near this DVD or any of its
assemblies.
3. Unless specified otherwise in this service data, clean
electrical contacts by applying an appropriate contact
cleaning solution to the contacts with a pipe cleaner, cottontipped swab, or comparable soft applicator.
Unless specified otherwise in this service data, lubrication of
contacts is not required.
4. Do not defeat any plug/socket B+ voltage interlocks with
which instruments covered by this service manual might be
equipped.
5. Do not apply AC power to this DVD and / or any of its
electrical assemblies unless all solid state device heat sinks
are correctly installed.
6. Always connect the test instrument ground lead to an
appropriate ground before connecting the test instrument
positive lead. Always remove the test instrument ground
lead last.
Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and turn
the power on. Connect an insulation resistance meter (500V)
to the blades of the attachment plug. The insulation resistance
between each blade of the attachment plug and accessible
conductive parts (Note 1) should be more than 1Mohm.
Note 1: Accessible Conductive Parts include Metal panels,
Input terminals, Earphone jacks,etc.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples of
typical ES devices are integrated circuits and some field effect
transistors and semiconductor chip components.
The following techniques should be used to help reduce the
incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component
or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known earth
ground. Alternatively, obtain and wear a commercially
available discharging wrist strap device, which should be
removed for potential shock reasons prior to applying power
to the unit under test.
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such
as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder
ES devices.
4. Use only an anti-static solder removal device. Some solder
removal devices not classified as “anti-static” can generate
electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
an electrical charge sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, aluminum
foil, or comparable conductive material).
7. Immediately before removing the protective material from
the leads of a replacement ES device, touch the protective
material to the chassis or circuit assembly into which the
device will be installed.
Caution: Be sure no power is applied to the chassis or
circuit, and observe all other safety precautions.
8.Minimize bodily motions when handling unpackaged
replacement ES devices. (Normally harmless motion such
as the brushing together of your clothes fabric or the lifting
of your foot from a carpeted floor can generate static
electricity sufficient to damage an ES device.)
1-4
THE PROCESS OF DISC DOWNLOAD
Please follow the below process to download a program with disc
1. Turn on the DVD-player.
(Note. Be sure that there is no disc in DVD-player)
2. Press “SETUP” button on Remote control.
3. Choose a “display” menu by using the cursor button and then choose a “TV Aspect” menu. And choose “16:9”
menu.
4. Press the 1 --> 3 --> 9 --> 7 --> 1 --> 3 --> 9(numerical button) --> Enter key on remote control to confirm the
system information.
5. Remember or write the model name.
6. Change the program file name of new version to the model name
Ex> New ver. program file->LG_DV_LV80F7FC10EMSMIS_V014.ROM
Model name -> LG_DV_LV81F7FC00EMS
Change New ver. program file like this --> LG_DV_LV81F7FC00EMSMIS.ROM
(NOTICE) You must add “MIS” at the end of model name
If you don”t change the file name like that, Disc download isn”t be worked.
1-5
7. Copy the changed file to a disc.
8. Insert the copied disc to DVD-player.
9. If the below picture appears on the screen, Press “ ” key.
10.After the below picture appears on the screen, Disc will emerge from DVD-player automatically.
Take the disc out of the DVD-player.
11.After Disc download is completed, DVD-player turns off and then turns on automatically.
12.Do it again the process 1, 2, 3, 4 to confirm the version.
1-6
SPECIFICATIONS
• GENERAL
Power requirements: AC 100 V ~ 240 V, 50 Hz / 60 Hz
Power consumption: 9 W
Dimensions (Approx.): 430 x 39 x 192 mm (17 x 1.5 x 7.6 inches) (W x H x D) without foot
Net weight (Approx.): 1.5 kg (3.3 lbs)
Operating temperature: 5 °C to 35 °C (41 °F to 95 °F)
Operating humidity: 5 % to 90 %
• OUTPUTS
VIDEO OUTPUT: 1.0 V (p-p), 75 , sync negative, RCA jack x 1 / Scart (to TV)
S-VIDEO OUTPUT: (Y) 1.0 V (p-p), 75 , negative sync, Mini DIN 4-pin x 1
(C) 0.3 V (p-p) 75
COMPONENT VIDEO OUTPUT: (Y) 1.0 V (p-p), 75 , negative sync, RCA jack x 1
(Pb)/(Pr) 0.7 V (p-p), 75 , RCA jack x 2
HDMI OUTPUT (Video/Audio): 19 pin (HDMI standard, Type A)
AUDIO OUTPUT: 2.0 Vrms (1 kHz, 0 dB), 600 , RCA jack (L, R) x 1 / Scart (to TV)
DIGITAL AUDIO OUTPUT: COAXIAL: 0.5 V (p-p), 75 , RCA jack x 1
OPTICAL: 3 V (p-p), Optical jack x 1
• SYSTEM
Laser: Semiconductor laser, wavelength 650 nm
Signal system: PAL
Frequency response: DVD (PCM 96 kHz): 8 Hz to 44 kHz
DVD (PCM 48 kHz): 8 Hz to 22 kHz
CD: 8 Hz to 20 kHz
Signal-to-noise ratio: More than 90 dB (ANALOG OUT connectors only)
Harmonic distortion: Less than 0.02 %
Dynamic range: More than 95 dB (DVD/CD)
1-7
MEMO
1-8
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS .....................................................................................................................................2-2
1. CABINET AND MAIN FRAME SECTION ..................................................................................................2-2
2. DECK MECHANISM SECTION (DP-12V).................................................................................................2-3
3. PACKING ACCESSORY SECTION...........................................................................................................2-4
2-1
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION
60
463
4
OPTIONAL PART
3
46346346
462
460
3
3
46346346
46346
460
462
462
A46
A
250
MAIN
E
CABLE2
CART
P3702
S
B
C
461
B
62
C
4
E
N801
C
463
5
27
52
4
D
USB
A41
SMPS
276
A47
P101
100V~240V
POWER CORD
A44
20
3
300
467
465
470
261B
261
260
261B
261
62
4
261
261A
62
4
262
A26
A43
283
D
A50
62
261
4
261A
CABLE1
452
52
4
CN903
KEY
TIMER
80
2
2-2
2. DECK MECHANISM SECTION (DP-12V)
A26
026
A02
017
013
015
435
439
015B
015A
001
A01
002
003
018
014
020
016
010
440
442
A03
012
442
012
442
037
012
019
2-3
3. PACKING ACCESSORY SECTION
OPTIONAL PARTS
808 Battery
900 Remocon
803 Packing
810 Cable Set Ass'y
811 Plug Ass'y 1way(Yellow)
812 Plug Ass'y 2way
801 Owner's Manual
804
Packing Sheet
803 Packing
802
Box Carton
2-4
SECTION 3
ELECTRICAL
CONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE.....................................................................................3-2
1. SMPS TROUBLESHOOTING FLOW ......................................................................................................3-2
2. POWER CHECK FLOW ..........................................................................................................................3-4
3. SYSTEM OPERATION FLOW.................................................................................................................3-5
4. SYSTEM TEST FLOW ...........................................................................................................................3-6
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGIBG...................................3-12
1. SYSTEM 27MHZ CLOCK, RESET, FLASH R/W SIGNAL ....................................................................3-12
2. SDRAM CLOCK ...................................................................................................................................3-14
3. TRAY OPEN/CLOSE SIGNAL ...............................................................................................................3-14
4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)............................................................3-15
5. LENS CONTROL RELATED SIGNAL (NO DISC CONDITION) ..........................................................3-15
6. LASER POWER CONTROL RELATED SIGNAL (NO DISC CONDITION) ..........................................3-16
7. DISC TYPE JUDGEMENT WAVEFORM...............................................................................................3-16
8. FOCUS ON WAVEFORM ......................................................................................................................3-18
9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION) ...............................................................3-19
10. TRACKING CONTROL RELATED SIGNAL (SYSTEM CHECKING) ....................................................3-20
11. MT1389S AUDIO OPTICAL AND COAXIAL OUTPUT (SPDIF) ............................................................3-21
12. MT1389S VIDEO OUTPUT WAVEFORM .............................................................................................3-21
13. AUDIO OUTPUT FROM MT1389S........................................................................................................3-22
CONNECTOR PICTURE ..........................................................................................................................3-23
1. ALL CONNECTOR PICTURE ................................................................................................................3-23
2. MAIN BOARD CONNECTOR PICTURE ...............................................................................................3-24
3. CN201 CONNECTOR PICTURE...........................................................................................................3-25
4. CN202 CONNECTOR PICTURE...........................................................................................................3-25
5. CN601 CONNECTOR PICTURE...........................................................................................................3-26
6. CN602 CONNECTOR PICTURE...........................................................................................................3-26
7. CN604 CONNECTOR PICTURE...........................................................................................................3-27
8. CN605 CONNECTOR PICTURE...........................................................................................................3-27
9. CN705 CONNECTOR PICTURE...........................................................................................................3-28
BLOCK DIAGRAMS ..................................................................................................................................3-29
1. OVERALL BLOCK DIAGRAM ...............................................................................................................3-29
2. POWER (SMPS) BLOCK DIAGRAM.....................................................................................................3-30
3. MPEG & MEMORY BLOCK DIAGRAM.................................................................................................3-31
4. SERVO BLOCK DIAGRAM ...................................................................................................................3-32
5. VIDEO & HDMI BLOCK DIAGRAM.......................................................................................................3-33
6. AUDIO BLOCK DIAGRAM.....................................................................................................................3-34
CIRCUIT DIAGRAMS................................................................................................................................3-35
1. POWER (SMPS) CIRCUIT DIAGRAM ..................................................................................................3-35
2. MPEG CIRCUIT DIAGRAM...................................................................................................................3-37
3. SERVO CIRCUIT DIAGRAM.................................................................................................................3-39
4. JACK CIRCUIT DIAGRAM ....................................................................................................................3-41
5. SCART CIRCUIT DIAGRAM (OPTION) ................................................................................................3-43
6. USB CIRCUIT DIAGRAM ......................................................................................................................3-45
7. KEY CIRCUIT DIAGRAM ......................................................................................................................3-46
8. TIMER CIRCUIT DIAGRAM ..................................................................................................................3-47
• CIRCUIT VOLTAGE CHART.........................................................................................................3-49
PRINTED CIRCUIT BOARD DIAGRAMS...........................................................................................3-53
1. MAIN P.C.BOARD..................................................................................................................................3-53
2. POWER (SMPS) P.C.BOARD ...............................................................................................................3-55
3. KEY P.C.BOARD ...................................................................................................................................3-55
4. TIMER P.C.BOARD ...............................................................................................................................3-55
5. SCART P.C.BOARD (OPTION) .............................................................................................................3-57
6. USB P.C.BOARD ...................................................................................................................................3-57
3-1
ELECTRICAL TROUBLESHOOTING GUIDE
1. SMPS TROUBLESHOOTING FLOW
No 3.3VA
YES
Is the FR101 normal?
YES
Is the D105/D106/D107/
D108 normal?
YES
Is the Vcc (about 17V)
supplied to IC101 Pin2?
YES
Is the D121 normal?
YES
Is there about 2.5V at the
IC103 Pin1?
YES
NO
NO
NO
NO
NO
Replace the FR101
(Use the same ICW)
Replace the
D105/D106/D107/D108
Check or Replace the IC101
Replace the D121
Replace the IC103
Is the D123 normal?
YES
Is the D125 normal?
YES
Power Line of Main
PCB(DVD) is short
NO
NO
Replace the D123
Replace the D125
3-2
ELECTRICAL TROUBLESHOOTING GUIDE
No REG 5.0V
YES
Is the Vcc(=5.6V)
•
•
supplied to Q126
Collector?
YES
Is the Vcc(=12V)
•
•
supplied to Q126
Base?
YES
Check or Replace the Q126
No 12V
YES
Is the Vcc(=14V)
•
•
supplied to Q123
Collector?
NO
NO
NO
Check or Replace the D123
Check the ‘PWR CTL “H”’
signal from μ-com
Check or Replace the D125
YES
Is the Vcc(=12V)
•
•
supplied to Q126
Base?
YES
Check or Replace the Q123
NO
Check the ‘PWR CTL “H”’
signal from μ-com
3-3
ELECTRICAL TROUBLESHOOTING GUIDE
2. POWER CHECK FLOW
A. B.
No 5V No 3.3VA.
Is 3.3VA
section working?
YES
Is 5.6V present at
collector of Q126?
YES
Replace Q126. Check FR101 Replace Q121.
NO
No 3.3VA
Is there a DC voltage at
cathode of D105 or D107?
NO
NO
NO
Is 3.3VA
section working?
YES
Is 3.3V
present at emitter
of Q121?
YES
YES
Check D105/D106/D107/
D108 and replace.
YES
Replace IC101.
3-4
ELECTRICAL TROUBLESHOOTING GUIDE
3. SYSTEM OPERATION FLOW
Power on
1. 8032 initializes SERVO,DSP & RISC registers
2. Write RISC code to SDRAM
3. Reset RISC
Show LOGO
YES
Tray close to closed position
SLED moves to inner position
1. Judge whether have disc and disc type
2. Jump to related disc reading procedure
Recieve OPEN/CLOSE Key?
Tray closed?
NO
SLED at inner side?
NO
YES
YES
NO
1. Execute pressed Key & IR key
2. System operation routine loop
1. Stop playback & open Tray
2. Display tray open message & LOGO
NO
Receive CLOSE Key?
YES
3-5
ELECTRICAL TROUBLESHOOTING GUIDE
4. SYSTEM TEST FLOW
TEST
Check the AC
Voltage Power PCBA (110V
or 220V)
YES
Switch on the power PCBA
Is the DC
voltage outputs OK?
(5V, 3.3V, 12V, 5.6V
MOTOR)
YES
Make sure the main PCBA don't
short on VCCs and switch it on.
YES
Is 3.3V
and 1.8V DC outputs normal
on main PCBA?
YES
NO
NO
NO
Replace power PCBA or AC transformer.
Repair or Replace power PCBA
Check the regulators or related diodes.
Connect to PC RS232 cable and
update the FLASH memory code.
Update FLASH
successfully?
YES
A
NO
1. Check 27MHz system clock.
2. Check system reset circuit.
3. Check FLASH R/W enable signal PRD,
RWR.
4. Check RS232 SIGNALS.
5. Check FLASH Memory related circuit.
3-6
ELECTRICAL TROUBLESHOOTING GUIDE
A
RESET or power on.
Show LOGO?
YES
Does
tray move inside
when it is not at closed
position?
NO NO
Flash
memory operates
properly?
YES
SDRAM
NO
works properly?
YES
MT1389S
VIDEO outputs
NO
properly?
YES
Have TV
NO
signal output?
YES
Check AV cable
connection to TV set.
NO
Normal
TROUT & TRIN
NO
signals?
YES
Check connection lines
between FLASH & MT1389S
and the FLASH access time
whether is suitable or not.
Check connection lines
between SDRAM & MT1389S
and the SDRAM is damaged.
Check the related
circuit of MT1389S.
Check the filtering and amp
circuit of TV signal.
Check the load
OPEN & CLOSE switch
B
YES
TRCLOSE & TROPEN
Normal
signal?
YES
Normal
LOAD+ & LOAD-
signal?
YES
Check the cable connection
between main PCBA and loader.
3-7
NO
NO
Check the tray control I/O
pins on MT1389S & AM5890.
Check the tray control
amplifying circuit on Motor driver.
ELECTRICAL TROUBLESHOOTING GUIDE
B
Does
the SLED move
to inner side when it is
at outter position?
YES
Do not put in
disc and tray close.
Motor
driver STBY pin
is high?
YES
Is FMSO
DC level higher
than 1.4V?
YES
SL+
and SL- output
properly?
YES
Check the cable
connection with MECHA.
NONO
NO
NO
Check the connection
line of STBY signal.
Check the related
circuit of FMSO.
Check the amp circuit
on motor driver.
Optical Lens
has movements for
searching
focus?
YES
C
Proper
FOSO outputs to
motor driver?
YES
Proper
F+ & F-
outputs?
YES
Check cable connect on
with pick-up head.
3-8
NONO
NO
Check FOSO connection on
MT1389S and motor dirver.
Check the amp circuit
on motor dirver.
ELECTRICAL TROUBLESHOOTING GUIDE
C
Laser turns
on when reading
disc?
YES
Put disc in?
YES
Disc ID is
correct?
NO NO
LD01 or LD02
output properly?
YES
Collector
NO
voltage of power transistor
is OK?
YES
Check cable connection
between transistor ouput
and pick-up head.
NO
Laser off
NO
Proper
RFL signal on
NO
MT1389S?
YES
Check the laser power circuit
on MT1389S and connecting
to power transistor.
Check the related circuit on
laser power transistor.
Check the related circuit
on MT1389S RFL signal.
YES
Does
spindle rotate?
YES
D
Check LDO1 & LDO2 signal
NO NO
Proper
DMSO signal on
MT1389S.
YES
SP+ & SP-
NO
output properly?
YES
Check the cable
connection between spindle
and main PCBA.
3-9
Check DMSO related
circuit on MT1389S.
Check the spindle control
amp circuit of motor driver.
ELECTRICAL TROUBLESHOOTING GUIDE
D
Focus on OK?
YES
Track on OK?
YES
NO NO
signals on A, B, C, D of
Proper
MT1389S
YES
Check FEO signal
NO
on MT1389S
YES
Check FOSO
signal on MT1389S
NO NO
Normal
TEO Signal on
MT1389S?
YES
Properly
TRSO signal on
NO
MT1389S?
YES
T+ & T- output
NO
properly?
YES
Check connections between
MT1389S and pick-up head.
Check the FOSO connection
on MT1389S and motor driver.
Check the related
circuit on MT1389S
Check the TRSO
connection on MT1389S
and motor dirver.
Check the tracking control
amp circuit on motor driver.
Disc is play?
YES
E
NO
Check cable connection
on pick-up head.
Check RFO & RFLVL
signal waveform.
3-10
ELECTRICAL TROUBLESHOOTING GUIDE
E
Normal
Audio output when
disc playback?
YES
Normal
IR.VFD & Front pannel
key functions?
YES
NO
NO
Normal
audio DAC
out?
YES
Check audio filter,
amplify, mute circuit.
Commu-
nications between
IR.VFD Front pannel
key & MT1389S is
normally?
YES
NO
NO
Check the related
circuit of audio DAC.
Check communication
lines on MT1389S.
TEST END
NO
Check the cable
connection on Front pannel.
3-11
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