NAD T531B Manuale utente
SERVICE MANUAL
SERVICE MANUAL
T531B
T531C
T531AH
DVD VIDEO PLAYER
MODELS : T531B/T531C/T531AHSERVICE MANUAL
© NAD 2001
NAD ELECTRONICS INTERNATIONAL
TORONTO
T531B/T531C
T531AH
DVD VIDEO PLAYER
T531B/T531C
T531AH
DVD VIDEO PLAYER
CONTENTS
SECTION 1 . . . .SUMMARY
SECTION 2 . . . .CABINET & MAIN CHASSIS
SECTION 3 . . . .ELECTRICAL
SECTION 4 . . . .MECHANISM
SECTION 5 . . . .REPLACEMENT PARTS LIST
SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
........................... 1-3
SERVICING PRECAUTIONS .................................................................................................. 1-4
• General Servicing Precautions
• Insulation Checking Prodedure
• Electrostatically Sensitive Devices
SPECIFICATIONS ...................................................................................................................... 1-5
1-3
Prior to shipment from the factory, the products are strictly inspected to conform with the recognized product
safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such com-
pliance, it is equally important to implement the following precautions when a set is being serviced.
•Precautions during Servicing
1. Locations requiring special caution are denoted by labels and inscriptions on the cabinet, chassis and
certain parts of the product. When performing service, be sure to read and comply with these and other
cautionary notices appearing in the operation and service manuals.
2. Parts identified by the symbol and shaded (
Y
) parts are critical for safety.
Replace only with specified part numbers.
Note : Parts in this category also include those specified to comply with X-ray emission standards for
products using cathode ray tubes and those specified for compliance with various regulations
regarding spurious radiation emission.
3. Use Specified internal wiring. Note especially:
1) Double insulated wires
2) High voltage leads
4. Use specified insulating materials for hazardous live parts. Note especially:
1) Insulation Tape
2) PVC tubing
3) Spacers
4) Insulation sheets for transistor
5. Observe that wires do not contact heat producing
parts (heatsinks, oxide metal film resistors, fusible
resistors, etc.)
6. Check that replaced wires do not contact sharp edged
or pointed parts.
7. 1) When a power cord has been replaced, check
that A mark is made on the cord, under strain,
near the aperture, and the flexible cord is
subjected 100 times to a pull of 40N for a duration
of 1 second each.
2) During the test, the cord shall not be displaced by
more than 2mm
8. Also check areas surrounding repaired locations.
IMPORTANT SAFETY PRECAUTIONS
Fig. 1
Power cord
1-4
Fig. 3
SAFETY CHECK AFTER SERVICING
Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and
wires have been returned to original positions. Afterwards, perform the following tests and confirm the specified
values in order to verify compliance with safety standards.
•Insulation resistance test
confirm the specified insulation resistance or greater between power cord plug prongs and externally exposed
parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone
jacks, earphone jacks, etc.) See table below.
•Dielectric strength test
Confirm specified dielectric strength or greater between power cord prongs and exposed accessible parts of
the set (RF terminals, antenna terminals, video and
audio input and output terminals, microphone jacks,
earphone jacks, etc.) See table below.
•Clearance distance
When replacing primary circuit components, confirm
specified clearance distance (d), (d') between sol-
dered terminals, and between terminals and sur-
rounding metallic parts. See table below.
Table 1 : Ratings for selected areas
* Class II model only.
Note. This table is unofficial and for reference only. Be sure to confirm the precise values for your particular
country and locality.
•Leakage Current test
Confirm specified or lower leakage current between B(earth ground, power cord plug prongs) and externally
exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, micro-
phone jacks, earphone jacks, etc.)
Measuring Method: (Power ON)
Insert load Z between B(earth ground, power cord
plug prongs) and exposed accessible parts. Use an
AC voltmeter to measure across both terminals of
load Z. See figure and following table.
Table 2:Leakage current ratings for selected areas.
Note. This table is for IEC member only. Be sure to confirm the precise values for your particular country and
Note. locality.
Chassis
d
a
Primary circuit terminals
Exposed
accessible
part Z
Load AC Voltmeter
Earth Ground,
Power cord plug prongs
B
Fig. 2
AC Line Voltage
AC Line Voltage
100 to 130 V
200 to 240 V
*100 to 130 V
*200 to 240 V
Australia
Europe
Australia
Europe
Other terminals
Antenna earth
terminals
i E0.7m A peak
i E2m A DC
i E0.7m A peak
i E2m A DC
F10 MΩ/500 V DC 4kV 1 minute F6mm(d)
F8mm(d)
(a Power cord)
Region Load Z Leakage Current(i) Earth Ground
(B) to :
Region Insulation
Resistance Dielectric
Strength Clearance
Distance(d),(d)
2kΩ
50kΩ
1-5
SPECIFICATIONS
DVD VIDEO PLAYER
Power supply AC 110~240V, 50/60Hz(T531B, T531C)
AC 120V, 60Hz(T531AH)
Power consumtion 16W
Mass 3.0kg(6.6lbs)
External dimensions 435 x 88 x 247 mm (W x H x D)
Signal system PAL 625/50, NTSC 525/60
Laser Semiconductor laser, wavelength 650nm
Frequency range (digital audio) 4Hz to 20kHz
Signal-to-noise ratio (digital audio) More than 100dB (EIAJ)
Audio dynamic range (digital audio) More than 95dB (EIAJ)
Harmonic distortion(digital audio) 0.008%
Wow and flutter Below measurable level (less than +0.001%(W.PEAK)) (EIAJ)
Operations Temperature : 5˚C(41˚F) to 35˚C(95˚F),
Operation status : Horizontal
OUTPUTS
Video outputs 1.0V(p-p), 75Ω, negative sync., RCA jack x 1/
SCART(TO TV) (T531C ONLY)
S video outputs (Y)1.0V(p-p), 75Ω, negative sync.,Mini DIN 4-pin x 1
(C)0.286V(p-p), 75Ω
Audio output(digital audio) 0.5V(p-p), 75Ω, RCA jack X 1
Audio output(optical audio) Optical connector x 1
Audio output(analog audio) 2.0Vrms (1kHz, 0dB), 330Ω, RCA jack (L, R) x 1/
SCART(TO TV) (T531C ONLY)
*Designs and specifications are subject to change without notice.
*Weight and dimensions shown are approximate.
2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
1. DISASSEMBLY.........................................................................................................................2-2
CABINET DISASSEMBLY ............................................................................................................2-2
CIRCUIT BOARD DISASSEMBLY ...............................................................................................2-3
2. EXPLODED VIEWS ................................................................................................................2-4
1. Cabinet and Main Frame Section...........................................................................................2-4
2. Packing Accessory Section....................................................................................................2-5
2-2
DISASSEMBLY
CAUTION BEFORE STARTING SERVICING
Electronic parts are susceptible to static electricity and may easily and damaged, so do not forget to take a
proper grounding treatment as required.
Many screws are used inside the unit. To prevent missing, dropping, etc. of the screws, always use a
magnetized screw driver in servicing. Several kinds of screws are used and some of them need special
cautions. That is, take care of the tapping screws securing molded parts and fine pitch screws used to secure
metal parts. If they are used improperly, the screw holes will be easily damaged and the parts can not be fixed.
Top Case
(A)
(A)
(A)
(A)
(A)
(A)
(A)
Tray Door
Disc Tray
Front Panel
Stopper
Stopper
(B)
CABINET DISASSEMBLY
1. Top Case
1. Release 7 screws (A). (See Fig. 2-1)
2. Lift the top case with holding the back of it,
and remove it in the direction of the arrow
Fig. 2-1
Fig. 2-2
Fig. 2-3
3. Front Panel
1. Eject the disc tray. (See Fig. 2-2)
2. Remove the tray door. (See Fig. 2-2)
3. Release 2 screws (B).
4. Pull the front panel toward you while pressing
7 stoppers to disengage, and remove the front
panel. (See Fig. 2-3)
2.Tray Door
1.Eject the disc tray.
2.Lift up the tray door in the direction of the
arrow.
2-3
Main Circuit Board
(C)
(C) (C)
(C) (C)
(C)
(C)
(C)
(C)
(C)
(C)
(C)
Power Code
Interface
Board
(D)
(D)
Scart
Key
Circuit Board
(E)
(E) (E)(E)
(5, 6, 7 TOOLONLY)
Fig. 2-4
Fig. 2-5
1. Disassembling of Main Circuit Board
and Interface Board
1. Remove the top case.(See Fig. 2-1)
2. Remove 12 screw (C).
3. Remove the deck from Main Circuit Board.
4. Remove Main Circuit Board from Interface Board.
5. Remove 2 screw (D).
6. Remove Interface Board from the chassis.
CIRCUIT BOARD DISASSEMBLY
Note: Before removing the main circuit board, be sure to shortcircuit the laserdiode output land.
After replacing the main circuit board, open the land after inserting the flexible connector.
(Refer to Mechanism Disassembly)
2. Digitron and Key Circuit Board
1. Remove the front panel.(See Fig. 2-3)
2. Release 4 screws (E), and remove the digitron
circuit board.
2-4
EXPLODED VIEWS
1. Cabinet and Main Frame Section
280
465
467
465
465
463
A46
463
463
275
332
PBP00
PBT00
283
260
467
300
467
A48
A43
250
462
462
463
463
452
452
285
OPTIONAL PART
Scart
A
5
4
3
2
1
BCD
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