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Extracted text from Nad T 517 C Service Manual (Ocr-read)
Page 1
CONTENTS
SECTION 1 .........SUMMARY
SECTION 2 .........CABINET & MAIN CHASSIS
SECTION 3 .........ELECTRICAL
SECTION 4 .........MECHANISM (DP-12V)
SECTION 5 .........REPLACEMENT PARTS LIST
Page 2
SECTION 1
SUMMARY
CONTENTS
1-2
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
Page 3
1-3
PRODUCT SAFETY SERVICING GUIDELINES FOR DVD PRODUCTS
IMPORTANT SAFETY NOTICEThis 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 : Do not attempt to modify this product in any way. Never perform
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 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.
SERVICE INFORMATIONWhile 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 HAZARD1. Be sure that all components are positioned to avoid a possibility of adjacent
component shorts. This is especially important on items trans-ported to and from the
repair shop.
2. Verify that all protective devices such as insulators, barriers, covers, shields, strain
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.
3. Soldering must be inspected to discover possible cold solder joints, solder splashes,
or sharp solder points. Be certain to remove all loose foreign particles.
4. Check for physical evidence of damage or deterioration to parts and components,
for frayed leads or damaged insulation (including the AC cord), and replace if
necessary.
5. No lead or component should touch a high current device or a resistor rated at 1 watt
or more. Lead tension around protruding metal surfaces must be avoided.
6. After reassembly of the set, always perform an AC leakage test on all exposed
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 A LINE 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.
Page 20
3-8
NO NO
YES Check the connection
line of STBY signal.
NO
YES Check the related
circuit of FMSO.
NO
YES Check the amp circuit
on motor driver.
Check the cable
connection with MECHA.
Do not put in
disc and tray close.
YES
YES
Check cable connect on
with pick-up head.
YES
YES
Motor
driver STBY pin
is high?
Is FMSO
DC level higher
than 1.4V?
SL+
and SL- output
properly?
Does
the SLED move
to inner side when it is
at outter position?
NO NO Check FOSO connection on
MT1389S and motor dirver. Proper
FOSO outputs to
motor driver?
NO Check the amp circuit
on motor dirver. Proper
F+ & F-
outputs?
Optical Lens
has movements for
searching
focus?
B
C
ELECTRICAL TROUBLESHOOTING GUIDE
Page 29
3-17
FIG 7-2 (DVD)
F+
FE
RFL
FIG 7-3 (CD)
F+
FE
RFL
Page 60
4-2
DECK MECHANISM PARTS LOCATION
- TOP VIEW (WITHOUT TRAY) Procedure
Parts Fixing TypeDisass Fig-
Starting No.embly ure
1 Main Base 4-1
12Clamp Assembly
4-1
Disc
1, 2 3 Plate Clamp 4-1
1, 2, 3 4 Magnet Clamp 4-1
1, 2, 3, 4 5 Clamp Upper 4-1
1 6 Tray Disc 4-2
1, 6 7 Base Assembly Sled 4-3
4 Screws,
1, 2, 6 8 Gear Feed 1 Connector 4-3
1 Locking Tabs
1, 2, 6, 8 9 Gear Middle
1, 2, 6, 8,
10 Gear Rack 1 Screw 4-3
9
1, 2, 7 11 Rubber Rear 4-3
1, 2, 7 12Frame Assembly
1 Screw Bottom 4-4
Up/Down
1, 2 13 Belt Loading 1 Locking Tab 4-4
1, 2 ,13 14 Gear Pulley 4-4
1, 2, 13, 14 15 Gear Loading 1 Locking Tab 4-4
1, 2, 7, 12,
16 Guide Up/Down 4-4
13, 14
1, 2, 13 17 PWB Assembly1 Locking Tab
Bottom 4-4
Loading1 Hook
2 Screw
1, 2, 7, 12,
13, 14, 15, 18 Base Main 2 Locking Tabs 4-4
16, 17
- TOP VIEW (WITH TRAY)
- BOTTOM VIEW
Note
When reassembling, perform the procedure in
reverse order.
The Bottom on Disassembly column of above
Table indicates the part should be disassembled
at the Bottom side.
Page 61
4-3
1. MAIN BASE (FIG. 4-1)
1-1. Clamp Assembly Disc
1) Place the Clamp Assembly Disc as Fig. (A)
2) Lift up the Clamp Assembly Disc in direction of
arrow(A).
3) Separate the Clamp Assembly Disc from the
Holder Clamp.
1-1-1. Plate Clamp
1) Turn the Plate Clamp to counterclockwise
direction and then lift up the Plate Clamp.
1-1-2. Magnet Clamp
1-1-3. Clamp Upper
2. TRAY DISC (FIG. 4-2)
1) Insert and push a Driver in the emergency eject
hole(A) at the right side, or put the Driver on the
Lever(B) of the Gear Emergency and pull the
Lever(B) in direction of arrow so that the Tray
Disc is ejected about 15~20mm.
2) Pull the Tray Disc until it is separated from the
Base Main completely.
DECK MECHANISM DISASSEMBLY
FIG. 4-1 FIG. 4-2
MAIN BASE
PLATE CLAMP
MAGNET CLAMP
CLAMP UPPER
HOLDER
BASE MAIN(Fig. A)
DISC CLAMP ASSEMBL Y
TRA Y DISC
BASE MAIN
LEVER
BASE MAIN
BOTTOM SIDE VIEW