Denon DVD-1910, DVD-755 Service Manual
For U.S.A. & Canada model
SERVICE MANUAL
MODEL DVD-1910
DVD-755
DVD VIDEO PLAYER
Ver. 3
●
For purposes of improvement, specifications and
design are subject to change without notice.
●
Please use this service manual with referring to the
operating instructions without fail.
●
Some illustrations using in this service manual are
slightly different from the actual set.
注 意
サービスをおこなう前に、このサービスマニュアルを
必ずお読みください。本機は、火災、感電、けがなど
に対する安全性を確保するために、さまざまな配慮を
おこなっており、また法的には「電気用品安全法」に
もとづき、所定の許可を得て製造されております。
従ってサービスをおこなう際は、これらの安全性が維
持されるよう、このサービスマニュアルに記載されて
いる注意事項を必ずお守りください。
●
本機の仕様は性能改良のため、予告なく変更すること
があります。
●
補修用性能部品の保有期間は、製造打切後8年です。
●
修理の際は、必ず取扱説明書を参照の上、作業を行っ
てください。
●
本文中に使用しているイラストは、説明の都合上現物
と多少異なる場合があります。
TOKYO, JAPAN
Denon Brand Company, D&M Holdings Inc.
X0217V.03 DE/CDM 0508
DVD-1910/755
TABLE OF CONTENTS
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
LASER BEAM SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
IMPORTANT SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
STANDARD NOTES FOR SERVICING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
CABINET DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
WAVEFORMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
WIRING DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
FIRMWARE RENEWAL MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
LEAD IDENTIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Manufactured under license from Dolby Laboratories. "Dolby"
and the double-D symbol are trademarks of Dolby Laboratories.
2
DVD-1910/755
SPECIFICATIONS
ITEM CONDITIONS UNIT NOMINAL LIMIT
1. Video Output 75 ohm load Vpp 1.0 ± 0.1
2. Optical Digital Out dBm -18
3. Audio (PCM)
3-1. Output Level 1 kHz 0 dB Vrms 2.0
3-2. S/N dB 115
3-3. Freq. Response
DVD fs=48kHz ± 0.5dB Hz 4~22 k
CD fs=44.1kHz ± 0.5dB Hz 4~20 k
3-4. THD+N
DVD 1 kHz 0dB % 0.004
CD 1 kHz 0dB % 0.0045
NOTES:
1. All Items are measured without pre-emphasis unless otherwise specified.
2. Power supply : AC120 V 60 Hz
3. Load imp. : 100 k ohm
4. Ambient Temperature : +25
°
C
3
DVD-1910/755
LASER BEAM SAFETY PRECAUTIONS
This DVD player uses a pickup that emits a laser beam.
Do not look directly at the laser beam coming
from the pickup or allow it to strike against
your skin.
The laser beam is emitted from the location shown in the figure. When checking the laser diode, be sure to keep your
eyes at least 30cm away from the pickup lens when the diode is turned on. Do not look directly at the laser beam.
Caution: Use of controls and adjustments, or doing procedures other than those specified herein, may result in hazardous radiation exposure.
Drive Mecha Assembly
Laser Beam Radiation
Laser Pickup
Turntable
WHEN OPEN. DO NOT
CAUTION
LASER RADIATION
STARE INTO BEAM.
Location: Top of DVD mechanism.
4
IMPORTANT SAFETY PRECAUTIONS
DVD-1910/755
Product Safety Notice
Some electrical and mechanical parts have special
safety-related characteristics which are often not evident from visual inspection, nor can the protection they
give necessarily be obtained by replacing them with
components rated for higher voltage, wattage, etc.
Parts that have special safety characteristics are identi-
fied by a on schematics and in parts lists. Use of a
substitute replacement that does not have the same
safety characteristics as the recommended replacement part might create shock, fire, and/or other hazards. The Product’s Safety is under review
continuously and new instructions are issued whenever
appropriate. Prior to shipment from the factory, our
products are carefully inspected to confirm with the recognized product safety and electrical codes of the
countries in which they are to be sold. However, in
order to maintain such compliance, it is equally important to implement the following precautions when a set
is being serviced.
Precautions during Servicing
A. Parts identified by the symbol are critical for
safety. Replace only with part number specified.
B. In addition to safety, other parts and assemblies are
specified for conformance with regulations applying
to spurious radiation. These must also be replaced
only with specified replacements.
Examples: RF converters, RF cables, noise blocking capacitors, and noise blocking filters, etc.
C. Use specified internal wiring. Note especially:
1)Wires covered with PVC tubing
2)Double insulated wires
3)High voltage leads
D. Use specified insulating materials for hazardous live
parts. Note especially:
1)Insulation tape
2)PVC tubing
3)Spacers
4)Insulators for transistors
E. When replacing AC primary side components
(transformers, power cord, etc.), wrap ends of wires
securely about the terminals before soldering.
F. Observe that the wires do not contact heat produc-
ing parts (heatsinks, oxide metal film resistors, fusible resistors, etc.).
G. Check that replaced wires do not contact sharp
edges or pointed parts.
H. When a power cord has been replaced, check that 5
- 6 kg of force in any direction will not loosen it.
I. Also check areas surrounding repaired locations.
J. Be careful that foreign objects (screws, solder drop-
lets, etc.) do not remain inside the set.
K. Crimp type wire connector
The power transformer uses crimp type connectors
which connect the power cord and the primary side
of the transformer. When replacing the transformer,
follow these steps carefully and precisely to prevent
shock hazards.
Replacement procedure
1)Remove the old connector by cutting the wires at a
point close to the connector.
Important: Do not re-use a connector. (Discard it.)
2)Strip about 15 mm of the insulation from the ends
of the wires. If the wires are stranded, twist the
strands to avoid frayed conductors.
3)Align the lengths of the wires to be connected.
Insert the wires fully into the connector.
4)Use a crimping tool to crimp the metal sleeve at its
center. Be sure to crimp fully to the complete closure of the tool.
L. When connecting or disconnecting the internal con-
nectors, first, disconnect the AC plug from the AC
outlet.
5
Safety Check after Servicing
DVD-1910/755
Examine the area surrounding the repaired location for
damage or deterioration. Observe that screws, parts,
and wires have been returned to their original positions.
Afterwards, do the following tests and confirm the specified values to verify compliance with safety standards.
1. Clearance Distance
When replacing primary circuit components, confirm
specified clearance distance (d) and (d’) between soldered terminals, and between terminals and surrounding metallic parts. (See Fig. 1)
Table 1: Ratings for selected area
AC Line Voltage Clearance Distance (d), (d’)
120 V
Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.
3.2mm (0.126 inches)
≥
2. Leakage Current Test
Confirm the 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, microphone jacks, earphone jacks, etc.) is
lower than or equal to the specified value in the table
below.
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 the terminals of load Z. See
Fig. 2 and the following table.
1.5k
Chassis or Secondary Conductor
Primary Circuit Terminals
dd'
Exposed Accessible Part
Z
0.15 F
Earth Ground
B
Power Cord Plug Prongs
Fig. 1
AC Voltmeter
(High Impedance)
Fig. 2
Table 2: Leakage current ratings for selected areas
AC Line Voltage Load Z Leakage Current (i) Earth Ground (B) to:
120 V
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
0.15µF CAP. & 1.5kΩ RES.
Connected in parallel
i≤0.5mA Peak Exposed accessible parts
6
STANDARD NOTES FOR SERVICING
DVD-1910/755
Circuit Board Indications
1. The output pin of the 3 pin Regulator ICs is indicated as shown.
Top View
Out
2. For other ICs, pin 1 and every fifth pin are indicated
as shown.
Pin 1
3. The 1st pin of every male connector is indicated as
shown.
Input
In
Bottom View
5
10
Pb (Lead) Free Solder
When soldering, be sure to use the Pb free solder.
How to Remove / Install Flat Pack-IC
1. Removal
With Hot-Air Flat Pack-IC Desoldering Machine:.
(1) Prepare the hot-air flat pack-IC desoldering
machine, then apply hot air to the Flat Pack-IC
(about 5 to 6 seconds). (Fig. S-1-1)
Pin 1
Instructions for Connectors
1. When you connect or disconnect the FFC (Flexible
Foil Connector) cable, be sure to first disconnect the
AC cord.
2. FFC (Flexible Foil Connector) cable should be
inserted parallel into the connector, not at an angle.
FFC Cable
Connector
CBA
* Be careful to avoid a short circuit.
Fig. S-1-1
(2) Remove the flat pack-IC with tweezers while apply-
ing the hot air.
(3) Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(4) Release the flat pack-IC from the CBA using twee-
zers. (Fig. S-1-6)
Caution:
1. The Flat Pack-IC shape may differ by models. Use
an appropriate hot-air flat pack-IC desoldering
machine, whose shape matches that of the Flat
Pack-IC.
2. Do not supply hot air to the chip parts around the flat
pack-IC for over 6 seconds because damage to the
chip parts may occur. Put masking tape around the
flat pack-IC to protect other parts from damage.
(Fig. S-1-2)
7
DVD-1910/755
3. The flat pack-IC on the CBA is affixed with glue, so
be careful not to break or damage the foil of each
pin or the solder lands under the IC when removing
it.
Hot-air
Flat Pack-IC
Desoldering
CBA
Masking
Tape
Tweezers
Machine
Flat Pack-IC
Fig. S-1-2
With Soldering Iron:
(1) Using desoldering braid, remove the solder from all
pins of the flat pack-IC. When you use solder flux
which is applied to all pins of the flat pack-IC, you
can remove it easily. (Fig. S-1-3)
Flat Pack-IC
(2) Lift each lead of the flat pack-IC upward one by one,
using a sharp pin or wire to which solder will not
adhere (iron wire). When heating the pins, use a
fine tip soldering iron or a hot air desoldering
machine. (Fig. S-1-4)
Desoldering Braid
Soldering Iron
Fig. S-1-3
Sharp
Pin
Fine Tip
Soldering Iron
(3) Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(4) Release the flat pack-IC from the CBA using twee-
zers. (Fig. S-1-6)
Fig. S-1-4
8
DVD-1910/755
With Iron Wire:
(1) Using desoldering braid, remove the solder from all
pins of the flat pack-IC. When you use solder flux
which is applied to all pins of the flat pack-IC, you
can remove it easily. (Fig. S-1-3)
(2) Affix the wire to a workbench or solid mounting
point, as shown in Fig. S-1-5.
(3) While heating the pins using a fine tip soldering iron
or hot air blower, pull up the wire as the solder melts
so as to lift the IC leads from the CBA contact pads
as shown in Fig. S-1-5.
(4) Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
(5) Release the flat pack-IC from the CBA using twee-
zers. (Fig. S-1-6)
Note:
When using a soldering iron, care must be taken to
ensure that the flat pack-IC is not being held by
glue. When the flat pack-IC is removed from the
CBA, handle it gently because it may be damaged
if force is applied.
2. Installation
(1) Using desoldering braid, remove the solder from the
foil of each pin of the flat pack-IC on the CBA so you
can install a replacement flat pack-IC more easily.
(2) The “
(See Fig. S-1-7.) Be sure this mark matches the 1
on the PCB when positioning for installation. Then
presolder the four corners of the flat pack-IC. (See
Fig. S-1-8.)
(3) Solder all pins of the flat pack-IC. Be sure that none
of the pins have solder bridges.
” mark on the flat pack-IC indicates pin 1.
●
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
Fig. S-1-7
To Solid
Mounting Point
CBA
Hot Air Blower
Iron Wire
Soldering Iron
Fig. S-1-5
Fine Tip
Soldering Iron
Presolder
or
Flat Pack-IC
CBA
Fig. S-1-8
Tweezers
Flat Pack-IC
Fig. S-1-6
9
Instructions for Handling
Semi-conductors
Electrostatic breakdown of the semi-conductors may
occur due to a potential difference caused by electrostatic charge during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a grounding band (1MΩ) that is properly grounded to remove any static electricity that may
be charged on the body.
2. Ground for Workbench
(1) Be sure to place a conductive sheet or copper plate
with proper grounding (1MΩ) on the workbench or
other surface, where the semi-conductors are to be
placed. Because the static electricity charge on
clothing will not escape through the body grounding
band, be careful to avoid contacting semi-conductors with your clothing.
<Incorrect>
DVD-1910/755
<Correct>
1MΩ
CBA
Grounding Band
1MΩ
CBA
Conductive Sheet or
Copper Plate
10
DVD-1910/755
CABINET DISASSEMBLY INSTRUCTIONS
1. Disassembly Flowchart
This flowchart indicates the disassembly steps to gain
access to item(s) to be serviced. When reassembling,
follow the steps in reverse order. Bend, route, and
dress the cables as they were originally.
[1] Top Cover
[2] Front Unit
[5] Rear Panel
[6] DVD Main CBA Unit
[7] DVD Mecha
[8] LED CBA
[9] AV CBA
[10] Loader Base
[11] Power PCB Holder
[3] Function CBA
[4] Front Assembly
2. Disassembly Method
ID/
LOC.
No.
[1] Top Cover D1 5(S-1) -
[2] Front Unit D2
[3]
[4]
[5] Rear Panel D4 6(S-3), 3(S-4), 2(S-5) -
[6]
[7] DVD Mecha
[8] LED CBA D7 *CN2082 -
[9] AV CBA D7 3(S-8), (S-9) -
[10] Loader Base D8 4(S-10) -
[11]
↓
(1)
PART
Function
CBA
Front
Assembly
DVD Main
CBA Unit
Power PCB
Holder
↓
(2)
Fig.
No.
D3 6(S-2) -
D3 ---------- -
D5
D5
D6
D8 2(S-11) -
↓
(3)
REMOVAL
REMOVE/*UNHOOK/
UNLOCK/RELEASE/
UNPLUG/DESOLDER
*2(L-1), Tray Panel,
*2(L-2), *3(L-3),
*CN2081
(S-6),
*CN201, *CN301,
*CN401, *CN601
4(S-7)
↓
(4)
Note
1
1-1
1-2
1-3
1-4
1-5
1-6
1-7
2
2-1
2-2
2
3
↓
(5)
(1): Identification (location) No. of parts in the figures
(2): Name of the part
(3): Figure Number for reference
(4): Identification of parts to be removed, unhooked,
unlocked, released, unplugged, unclamped, or desoldered.
P=Spring, L=Locking Tab, S=Screw,
CN=Connector
*=Unhook, Unlock, Release, Unplug, or Desolder
e.g. 2(S-2) = two Screws (S-2),
2(L-2) = two Locking Tabs (L-2)
(5): Refer to “Reference Notes.”
About tightening screws
When tightening screws, tighten them with the following
torque.
Screws Torque
(S-1), (S-2), (S-3), (S-4),
(S-5), (S-6), (S-7), (S-8),
(S-9), (S-10), (S-11)
0.45 ± 0.05 N·m
Reference Notes
CAUTION 1: Locking Tabs (L-1), (L-2) and (L-3) are
fragile. Be careful not to break them.
1-1. Connect the wall plug to an AC outlet and press
the [OPEN/CLOSE] button to open the tray.
1-2. Remove the Tray Panel by releasing two locking
tabs (L-1).
1-3. Press the [OPEN/CLOSE] button again to close
the tray.
1-4. Press the [POWER] button to turn the power off.
1-5. Unplug an AC cord.
1-6. Disconnect connector CN2081.
1-7. Release two Locking Tabs (L-2). Then release
three Locking Tabs (L-3), and remove the Front
Unit.
CAUTION 2: Electrostatic breakdown of the laser diode
in the optical system block may occur as a potential difference caused by electrostatic charge accumulated on
cloth, human body etc, during unpacking or repair
work.
To avoid damage of pickup follow next procedures.
2-1. Short the three short lands of FPC cable with sol-
der before removing the FFC cable (CN201) from
it. If you disconnect the FFC cable (CN201), the
laser diode of pickup will be destroyed. (Fig. D4)
2-2. Disconnect Connectors (CN301), (CN401) and
(CN601). Remove a Screw (S-6) and lift the DVD
Main CBA Unit. (Fig. D4)
11
CAUTION 3: When reassembling, confirm the FFC
cable (CN201) is connected completely. Then remove
the solder from the three short lands of FPC cable.
(Fig. D4)
[3] Function CBA
DVD-1910/755
(S-2)
(S-2)
(S-1)
(L-1)
Tray Panel
(L-1)
[1] Top Cover
(S-1)
(S-1)
Fig. D1
[4] Front Assembly
[5] Rear Panel
(S-4)
(S-3)
(S-5)
Fig. D3
(S-3)
(L-3)
(L-2)
(L-2)
CN2081
[2] Front Unit
Fig. D2
(S-4)
Fig. D4
12
DVD-1910/755
(S-6)
CN201
CN301
CN401
A
Short the three short lands by soldering.
(Either of two places.)
CN601
[6] DVD Main
CBA Unit
[8] LED CBA
[11] Power
PCB Holder
CN2082
(S-11)
(S-8)
(S-9)
[9] AV CBA
Fig. D7
(S-10)
(S-10)
[10] Loader
Base
(S-7)
Connector
View for A
Fig. D5
(S-7)
Fig. D8
[7] DVD Mecha
Fig. D6
13
HOW TO EJECT MANUALLY
1. Remove the Top Cover.
2. Rotate the roulette in the direction of the arrow as shown
below.
Rotate this roulette in
the direction of the arrow
DVD-1910/755
View for A
A
14
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