Denon DVD-900 Service Manual
SERVICE MANUAL
For Europe model
MODEL
DVD VIDEO PLAYER
DVD-900
Some illustrations using in this service manual are slightly different from the actual set.
16-11, YUSHIMA 3-CHOME, BUNKYOU-KU, TOKYO 113-0034 JAPAN
Telephone: 03 (3837) 5321
X0156-2 NC 0209
TABLE OF CONTENTS
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
LASER BEAM SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
IMPORTANT SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
STANDARD NOTES FOR SERVICING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
CABINET DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
BLOCK DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
FIRMWARE RENEWAL MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
LEAD IDENTIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
EXPLODED VIEWS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Manufactured under license from Dolby Laboratories. "Dolby"
and the double-D symbol are trademarks of Dolby Laboratories.
"DTS" and "DTS Digital Out" are trademarks of Digital Theater Systems Inc.
SPECIFICATIONS
ITEM CONDITIONS UNIT NOMINAL LIMIT
1. Video Output 75 ohm load Vpp 1.0
2. Optical Digital Out dBm -18
3. Audio (PCM)
3-1. Output Level 1kHz 0dB Vrms 2.0
3-2. S/N dB 110
3-3. Freq. Response
DVD fs=48kHz 20~22kHz dB ± 2
CD fs=44.1kHz 20~20 kHz dB ± 2
3-4. THD+N 1 kHz 0dB % 0.005
NOTES:
1. All Items are measured without pre-emphasis unless otherwise specified.
2. Power supply : AC220 〜 240 V 50 Hz
3. Load imp. : 100 K ohm
4. Room ambient : +25
°
C
- 3 -
D
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.
rive Mecha Assembly
Laser Beam Radiation
Laser Pickup
Turntable
CAUTION - VISIBLE LASER
RADIATION WHEN OPEN AND
INTERLOCK DEFEATED.
AVOID EXPOSURE TO BEAM.
Location: Inside Top of DVD mechanism.
- 4 -
IMPORTANT SAFETY PRECAUTIONS
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
identified 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
droplets, 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 -
r
e)
B
Z
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 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’)
3mm(d)
230 V
Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.
2. Leakage Current Test
≥
6 mm(d’)
≥
Chassis or Secondary Conducto
Primary Circuit Terminals
dd'
Fig. 1
Exposed Accessible Part
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.
Table 2: Leakage current ratings for selected areas
AC Line Voltage Load Z Leakage Current (i)
230 V
2kΩ RES.
Connected in
parallel
50kΩ RES.
Connected in
parallel
i≤0.7mA AC Peak
i≤2mA DC
i≤0.7mA AC Peak
i≤2mA DC
AC Voltmeter
(High Impedanc
One side of
Power Cord Plug Prongs
Fig. 2
One side of power cord plug
prongs (B) to:
RF or
Antenna terminals
A/V Input, Output
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
- 6 -
STANDARD NOTES FOR SERVICING
O
P
P
Circuit Board Indications
a. The output pin of the 3 pin Regulator ICs is indi-
cated as shown.
Top View
ut
b. For other ICs, pin 1 and every fifth pin are indicated
as shown.
Input
In
in 1
c. The 1st pin of every male connector is indicated as
shown.
in 1
Bottom View
5
10
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)
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)
(1) Release the flat pack-IC from the CBA using twee-
zers. (Fig. S-1-6)
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.
Caution:
1. 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)
2. 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
- 7 -
With Soldering Iron:
F
F
S
rp
or
n
(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)
lat Pack-IC
Desoldering Braid
(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.
Soldering Iron
Hot Air Blower
Fig. S-1-3
(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
Iron Wire
machine. (Fig. S-1-4)
Soldering Iron
To Solid
Mounting Point
Fig. S-1-5
Sha
Pin
ine Tip
oldering Iron
CBA
Fine Tip
Soldering Iro
Fig. S-1-4
(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)
Tweezers
Flat Pack-IC
With Iron Wire:
(1) Using desoldering braid, remove the solder from all
Fig. S-1-6
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
- 8 -
2. Installation
P
i
d
(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 “I” mark on the flat pack-IC indicates pin 1.
(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.
Example :
in 1 of the Flat Pack-IC
s indicated by a " " mark.
Fig. S-1-7
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
(4) 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 >
CBA
Presolder
Flat Pack-IC
Fig. S-1-8
CBA
< Correct >
Grounding Ban
1MΩ
CBA
1MΩ
Conductive Sheet or
Copper Plate
- 9 -
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 Assembly
[4] DVD Mecha
[5] Switch CBA
[7] DVD Main CBA Unit
[6] AV CBA
[8] Rear Panel
[3] Function CBA
2. Disassembly Method
ID/
LOC.
No.
[1] Top Cover D1 5(S-1) -
[2]
[3] Function CBA D3
[4] DVD Mecha
[5] Switch CBA D6
[6] AV CBA D6 5(S-5), 3(S-6) -
[7]
[8] Rear Panel D7 3(S-8) -
↓
(1)
PART
Front
Assembly
DVD Main
CBA Unit
↓
(2)
Fig.
No.
D2
D4,D53(S-3), *CN101,
D6
↓
(3)
REMOVAL
REMOVE/*UNHOOK/
UNLOCK/RELEASE/
UNPLUG/DESOLDER
*2(L-1), Tray Panel,
*2(L-2), *CN2002,
*5(L-3)
6(S-2),
Insulation Sheet
*CN401
(S-4), *2(L-4), Desolder
3(S-7), *CN1001,
*CN1601
↓
(4)
Note
1-1
1-2
1-3
1-4
1-5
1-6
-
2
2-1
2-2
2-3
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.”
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. Release two Locking Tabs (L-2). Then, release
five Locking Tabs (L-3) (to do this, first release
two Locking Tabs (A) at the side, and then three
Locking Tabs (B) at the bottom.)
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. Slide out the pickup unit as shown in Fig. D5.
2-2. Short the three short lands of FPC cable with sol-
der before removing the FFC cable (CN101) from
it. If you disconnect the FFC cable (CN101), the
laser diode of pickup will be destroyed. (Fig. D5)
2-3. Disconnect Connector (CN401). Remove three
Screws (S-3) and lift the DVD Mecha. (Fig. D4)
CAUTION 3: When reassembling, confirm the FFC
cable (CN101) is connected completely. Then remove
the solder from the three short lands of FPC cable.
(Fig. D5)
- 10 -
)
(S-1)
[1] T op Cover
(S-1)
(S-1
Fig. D1
CN401
(S-3)
(S-3)
[4] DVD Mecha
(L-1)
(A)
(B)
Tray Panel
(L-1)
(L-3)
(S-2)
[3] Function CBA
(L-2)
CN2002
[2] Front Assembly
(A)
Insulation Sheet
CN101
Fig. D4
A
DVD Mecha
B
Short the three short lands by soldering
Fig. D2
(S-2)
View for A
Fig. D3
- 11 -
Slide
Pickup Unit
View for B
OR
Short the three short
lands by soldering
C
View for C
Fig. D5
)
(S-4)
[5] Switch
CBA
(S-7)
(L-4)
[7] DVD Main CBA Unit
[6] AV CBA
CN1001
(S-6)
Desolder
(S-7)
CN1601
(S-6)
(S-5)
(S-8)
[8] Rear Panel
(S-5
Fig. D7
Fig. D6
HOW TO MANUAL EJECT
1. Remove the Top Cover.
2. Insert the eject-bar (length = approximately 80
mm, diameter = approximately 3 mm) into the
manual eject hole on the DVD Mecha. Then,
press it until the tray is ejected.
Top Cover
1
Tray
Manual
Eject Hole
DVD Mecha
2
3
Eject-Bar (Length = approximately 80 mm, Diameter = approximately 3 mm)
- 12 -
FLOW CHART NO.1
The power cannot be turned on.(1)
TROUBLESHOOTING
Is the fuse normal?
Yes
Is normal state restored when once unplugged
power cord is plugged again after several seconds?
Yes
Is the EV 5V line voltage normal?
Yes
Is the voltage of secondary side normal?
FLOW CHART NO.2
The power cannot be turned on.(2)
Does the change from STANDBY LED indicate
turn-off?
Yes
Is the voltage of 3.3V supplied to Q2021?
Yes
Is the "H" signal inputted to the base of Q2021,
when the POWER button activated on the DVD?
Yes
Is the "H" signal inputted at base of Q2021,
when the POWER button activated on the remote
control unit?
Yes
Replace Q2021.
No
No
No
No
No
No
No
No
See FLOW CHART No.3 <The fuse blows out.>
Check if there is any leak or shor-circuit on the
primary circuit component?
(Q1001, Q1003,T1001, D1001, D1002, D1004,
D1005, D1011, C1003, C1005)
Check each rectifying circuit of secondary circuit.
Check the EV 3.3V line.
Check the POWER button line.
Check the line between the remote control
receiver and Pin(26) of CN1001.
The STANDBY LED indicate is flashing after 0.5 sec.
Yes (below, confirmed operating at LED turn-off of 0.5 sec. interval.)
Are the "P-ON-H" pulse outputted from the
pin(20) of CN1001?
Yes
Is the P-CON switch circuit operated normally?
(Q1002, Q1005, Q1006, IC1002, D1036, D1046)
FLOW CHART NO.3
The fuse blows out.
Check the presence that the primary component
is leaking or short then service it if defective.
After servicing, replace the fuse.
No
No
Replace the DVD Main CBA Unit.
Check each component, and replace.
Check the presence that the rectifying diode or
circuit is shorted in each rectifying circuit of
secondary side then service it if defective.
- 13 -
Loading...