Denon DVD-900 User manual

SERVICE MANUAL
MODEL DVD-900
DVD VIDEO PLAYER
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: [phone]
For Asia & Australia model
This service manual is composed of only pages whose contents are different
from those for the model DVD-900. For servicing, refer to the previously
issued service manual of DVD-900 (X0156-2) at the same time.
X0156-2 NC 0209

TABLE OF CONTENTS
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
BLOCK DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
EXPLODED VIEWS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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.

- 3 -
FLOW CHART NO.1
FLOW CHART NO.2
The power cannot be turned on.(1)
FLOW CHART NO.3
The fuse blows out.
After servicing, replace the fuse.
The power cannot be turned on.(2)
Is the fuse normal?
Is normal state restored when once unplugged
power cord is plugged again after several seconds?
Is the EV 5V line voltage normal?
Is the voltage of secondary side normal?
Does the change from STANDBY LED indicate
turn-off?
Is the voltage of 3.3V supplied to Q2021?
Is the "H" signal inputted to the base of Q2021,
when the POWER button activated on the DVD?
Is the "H" signal inputted at base of Q2021,
when the POWER button activated on the remote
control unit?
Replace Q2021.
The STANDBY LED indicate is flashing after 0.5 sec.
Are the "P-ON-H" pulse outputted from the
pin(20) of CN1001?
Is the P-CON switch circuit operated normally?
(Q1002, Q1005, Q1006, IC1002, D1036, D1046)
Check the presence that the primary component
is leaking or short then service it if defective.
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.
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.
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes (below, confirmed operating at LED turn-off of 0.5 sec.interval.)
Yes
TROUBLESHOOTING

- 4 -
FLOW CHART NO.4
When the output voltage fluctuates.
Yes
No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
FLOW CHART NO.5
When buzz sound can be heard in the vicinity of the power circuit.
FLOW CHART NO.6
The fluorescent display tube does not light.
Is the voltage of 5V supplied to Pins(6, 24)
of IC2001?
Is the voltage of -24V supplied to Pin(15) of
IC2001?
Is there 500kHz oscillation to Pin(26) of IC2001?
Check the signal lines of FP-DIN, FP-DOUT,
FP-CLK, FP-STB of IC2001 and CN1001?
Are the filament voltage applied between (1, 2)
and (34, 35) of the fluorescent display tube?
Also negative voltage applied between these pins
and GND?
Replace the fluorescent display tube.
Check the EV 5V line.
Check the -FL (-24V) line.
Check R2001, IC2001 and their periphery.
Check or replace IC2001 and DVD Main CBA unit
.
Check or replace the power circuit, D1016, D1017
and R1042, and their periphery.
FLOW CHART NO.7
The key operation is not functioning.
Are the contact point and the installation state of the
key switches(SW2204-2210, 2901-2907) normal?
Is the control voltage normally supplied to
Pins(3, 4, 7, 8, 9, 10, 11, 12, 13, 14) of IC2001? Check the key switches (SW2204-2210,
2901-2907), and their periphery circuit.
Check if there is any short-circuit on the rectifying diode and the circuit in each rectifying circuit of the secondary side
.
(D1003, D1008, D1009, D1013, D1016, D1030, IC1002, Q1002, Q1004, Q1007, Q1011, Q1014)
Does the photo coupler circuit on the secondary
side operate normally?
Does the photo coupler circuit on the primary side
operate normally?
Check the circuit and replace the parts.
(IC1001, IC1006, D1048, D1015)
Check the circuit and replace the parts.
(IC1001, D1020, D1024)

- 5 -
FLOW CHART NO.8
No operation is possible from the remote control unit.
Operation is possible from the DVD, but no
operation is possible from the remote control unit.
Is no operation possible if replacing the remote
control unit?
Replace the infrared remote control receiver.
Original remote control unit is poor.
Check the line between the infrared remote control
receiver and Pin(26) of CN1001.
Replace DVD Main CBA unit.
Is the "L" pulse sent out from Pin(1) terminal of the
receiver when the infrared remote control is activated?
Is the "L" pulse signal supplied to Pin(26) of
CN1001 from Pin(1) of receiver? (Be operated by
SEARCH(-), SEARCH(+), PLAY, STILL/PAUSE,
STOP, POWER and OPEN/CLOSE button.)
Yes
Yes
Yes
Is 5V voltage supplied to Pin(3) terminal of infrared
remote control receiver? Yes
Yes
No
FLOW CHART NO.9
PON 12V is not outputted.
Is PON12V voltage supplied to the collector of Q1002?
Does the P-ON switch circuit operate normally?
(Q1005, Q1006, D1036, etc.)
Replace Q1002.
Check D1009, C1012 and the periphery circuit.
Check each component, and replace.
Yes
Yes
No
No
No
Check EV 5V line.
No
No
FLOW CHART NO.10
PON 5V is not outputted. (PON 12V is outputted normally.)
Is 5V voltage supplied to the collector of Q1004?
Is the "H" pulse inputted into the base of Q1004?
Replace Q1004.
Check D1030, D1048, C1035, C1048 and the
periphery circuit.
Check D1046 and the periphery circuit.
Yes
Yes
No
FLOW CHART NO.11
-FL is not outputted.
Is -24V voltage supplied to the anode of D1003? Check D1003 and periphery circuit.
Check if there is any leak or short-circuit on the
loaded circuit.
Yes
No
FLOW CHART NO.12
PON 3.3V is not outputted.
Is 3.3V voltage supplied to the emitter of Q1011?
Does the P-CON switch circuit operate normally?
(Q1005, Q1006, etc.)
Replace Q1011.
Check D1008, D1015, C1007, C1038 and the
periphery circuit.
Check each component, and replace.
Yes
Yes
No
No
No

- 6 -
FLOW CHART NO.13
PON 1.8V is not outputted.
FLOW CHART NO.14
The disc tray cannot be opened and closed.
(It can be done using the remote control unit.)
FLOW CHART NO.15
The disc tray cannot be opened and closed.
FLOW CHART NO.16
[No Disc] is indicated. (When the focus error occur.)
Replace the DVD Main CBA Unit.
Is 2.5V voltage supplied at pin(1) of IC1002?
Is 0V voltage supplied to Pin(9) of IC2001 when
the OPEN/CLOSE button is activated on the DVD?
See FLOW CHART NO. 15. <The disc tray cannot be opened and closed.>
Is the "H" pulse inputted into pin(4) of IC1002?
Replace IC1002.
Replace the DVD Main CBA Unit.
No improvement can be found.
No improvement can be found.
Replace the DVD Mecha.
Check D1013, C1014 and the periphery circuit.
Check PWRCON line.
Check the SW2208 and OPEN/CLOSE button.
The malfunction of the original DVD Main CBA Uni
t.
The malfunction of the original DVD Main CBA Uni
t.
Yes
Yes
No
Yes
No
No
No
Yes
Replace the DVD Mecha.
No
Yes

- 7 -
FLOW CHART NO.17
[No Disc] is indicated. (When the focus servo is not functioning.)
FLOW CHART NO.18
[No Disc] is indicated. (When the laser beam does not light up.)
FLOW CHART NO.19
Both functions of picture and sound do not operate normally.
Replace the DVD Main CBA Unit.
Replace the DVD Mecha.
No
Yes
Replace the DVD Main CBA Unit.
Replace the DVD Mecha.
No
Yes
Replace the DVD Main CBA Unit.
Replace the DVD Mecha.
No
Yes
No improvement can be found. The malfunction of the original DVD Main CBA Uni
t.
No improvement can be found. The malfunction of the original DVD Main CBA Uni
t.
No improvement can be found. The malfunction of the original DVD Main CBA Uni
t.

- 8 -
FLOW CHART NO.20
Picture does not appear normally.
Set the disc on the disc tray and playback.
Are the video signals outputted to each pin of
CN1601 on the the AV CBA? Replace the DVD Main CBA Unit or DVD Mecha .
Check the line between each pins of CN1601 and
each pins of IC1402 on the AV CBA .
Is 5V voltage supplied to the Pins(1, 3, 5, 34) of
IC1402?
Check or replace IC1402?
Check the periphery of the VIDEO OUT terminal
(JK1403) from Pins(18, 21, 24, 30) of IC1402.
Check the periphery of JK1401 from
Pin(27) of IC1402.
Check the periphery of JK1401 from
Pin(33) of IC1402.
CN1601 10PIN →IC1402 4PIN CVBS
CN1601 8PIN →IC1402 6PIN S-Y
CN1601 12PIN →IC1402 2PIN S-C
CN1601 6PIN →IC1402 14PIN B
CN1601 4PIN →IC1402 16PIN R
CN1601 2PIN →IC1402 12PIN G
Are the video signals shown above inputted into
each pin of IC1402?
Are the video signals outputted to each pin
of IC1402?
Are the video signals outputted to the specific
output terminal?
Are the composite video signals and component
video signals outputted to the VIDEO OUT
terminal (JK1403)?
Are the luminance signals outputted to the
S-OUT terminal (JK1401)?
Are the chroma signals outputted to the
S-OUT terminal (JK1401)?
Yes
Yes
Yes
Yes
No
No
No
No
No
No
CN1601 10PIN CVBS
CN1601 8PIN S-Y
CN1601 12PIN S-C
CN1601 6PIN B
CN1601 4PIN R
CN1601 2PIN G
IC1402 4PIN CVBS
IC1402 6PIN S-Y
IC1402 2PIN S-C
IC1402 14PIN B
IC1402 16PIN R
IC1402 12PIN G
IC1402 30PIN CVBS
IC1402 27PIN S-Y
IC1402 33PIN S-C
IC1402 21PIN B
IC1402 18PIN R
IC1402 12PIN G

- 9 -
FLOW CHART NO.21
Audio is not outputted.
Set the disc on the disc tray and playback.
Are the analog audio signals outputted to each pin
of CN1601 on the AV CBA?
Is the "H" level mute signals outputted to CN1601
on the AV CBA ?
CN1601 16PIN AUDIO-L
CN1601 18PIN AUDIO-R
CN1601 19PIN A-MUTE
CN1601 17PIN A-R-MUTE
CN1601 15PIN A-L-MUTE
IC1201 1PIN AUDIO-L
IC1201 7PIN AUDIO-R
IC1201 2PIN AUDIO-L
IC1201 6PIN AUDIO-R
Replace the DVD Main CBA Unit or DVD Mecha.
Replace the DVD Main CBA Unit.
Check or replace IC1201.
Check the periphery of Pins(1,7) of IC1201
and JK1201.
Check each line between each pin of CN1601
and each pin of IC1201 on the AV CBA.
CN1601 16PIN →IC1201 2PIN AUDIO-L
CN1601 18PIN →IC1201 6PIN AUDIO-R
Are the analog audio signals inputted to each pin
of IC1201.
Are the analog audio signals inputted to each pin
of IC1201?
Are the audio signals outputted to the specific
output terminal?
Are the audio signals outputted to the L/R OUT
terminal (JK1201)?
Yes
Yes
Yes
Yes
No
No
No
No
No

‑10‑
JK1401
S-VIDEO
OUT
CN701 CN1601
88VIDEO-Y
12 12VIDEO-C
3 4
21
AV CBA
DATA(VIDEO) SIGNAL VIDEO SIGNALDATA(AUDIO) SIGNAL
IC601 (DVD HOST PROCESSOR)
IC1402 (VIDEO DRIVER)
IC604
IC602
(8Mbit FLASH MEMORY)
PARA0
PARA7
A0
A18
DATA0
AD0
AD13
DATA15
DQ0
DQ15
CE
OE
WE
CS3
OE
DQM0
AD0
AD13
~
DQ0
DQ15
~
~
~
~
ADDR1
ADDR20
~
~
~
DATA0-DATA15
ADDR1-ADDR20
PARA0-PARA7
79 80 78
51
52
55
56
57
6 27
33
32
7677
17 18 39 16
8
1
~
25
16
~
6
13
~
29
45
~
DQ0
DQ15
DQML DQMU WE
~
15
(64Mbit SDRAM)
20 26 ~ 213 ~ 29 35 ~ 42 53 ~
173
182
~
161
170
~
141
158
~
11
26
28
128
132
117
DATA(VIDEO/AUDIO) SIGNAL
RAS CAS
LDQM
UDQM
WE
RAS CAS
58 63 ~ 66 73 ~74
19
CS
CS
INTERNAL
PERIPHERALS
PORTS
PROGRAMMABLE CPU INTERFACE
CENTRAL
COMMAND
PORT
FRONT-END
& LINK
INTERFACE
ST20 ARBITER &
MEMORY CONTROLLER
SDRAM ARBITER
SHARED SDRAM INTERFACE
I/F
VIDEO
DECODER
AUDIO
DECODER
CACHE
SUBSYSTEM
CPU
VIDEO
FILTERING
OSD, SP
DECODER
& MIXING
4dB
AMP 2dB AMP
LPF DRIVER
YC
CD FIFO SDRAM
BLOCK
MOVE
DENC
SPDIF
PCM-LRCLK
PCM-SCLK
PCM-DATA0
PCM-BCK
FROM DVD
SIGNAL PROCESS
BLOCK DIAGRAM TO AUDIO
BLOCK
DIAGRAM
DVD MAIN CBA UNIT
ADAC-MD
ADAC-MC
ADAC-ML
191
190
189
192
TO AUDIO
BLOCK DIAGRAM
A-MUTE
ADAC-MD
ADAC-MC
ADAC-ML
A-MUTE
48
2
33
97 102 ~ 84 93 ~
4dB
AMP 2dB AMP
LPF DRIVER
30
4dB
AMP 2dB AMP
LPF DRIVER4
21
4dB
AMP 2dB AMP
LPF DRIVER
18
4dB
AMP 2dB AMP
LPF DRIVER
16
14
10 10
VIDEO-CVBS
66VIDEO-B
44VIDEO-R
25
34
27
CN701 CN1601
WF2
WF3
WF1
22VIDEO-G
24
4dB
AMP 2dB AMP
LPF DRIVER
12
26
COMPOSITE
VIDEO OUT
VIDEO-R
OUT
VIDEO-B
OUT
VIDEO-G
OUT
JK1403
Video Block Diagram