Sharp DV-550U User manual

1
DV-550U
S38O3DV-550U/
DVD VIDEO PLAYER
SERVICE MANUAL
DV-550U
In the interests of user-safety (Required by safety regula-
tions in some countries) the set should be restored to its
originalconditionandonlypartsidenticaltothosespecified
be used.
MODEL
V I D E O
NTSC
Page
1. IMPORTANT SAFEGUARDS AND PRECAUTIONS ......................................................................1-1
2. FEATURES/3. SPECIFICATIONS ..................................................................................................2-1
4. PART NAMES.................................................................................................................................4-1
5. MAINTENANCE CHECK ITEMS AND EXECUTION TIME............................................................ 5-1
6. DISASSEMBLY AND REPLACEMENT OF MAIN PARTS............................................................. 6-1
7. EXPLANATION OF MECHANISM ..................................................................................................7-1
8. OPERATION OF PICKUP...............................................................................................................8-1
9. TEST MODE ...................................................................................................................................9-1
10. EXPLANATION OF OPERATION AT THE SYSTEM START ...................................................... 10-1
11. TROUBLESHOOTING ..................................................................................................................11-1
12. IC FUNCTION LIST.......................................................................................................................12-1
13. SEMICONDUCTOR LEAD IDENTIFICATION ..............................................................................13-1
14. BLOCK DIAGRAM ........................................................................................................................14-1
15. WIRING DIAGRAM .......................................................................................................................15-1
16. SCHEMATIC DIAGRAMS .............................................................................................................16-1
17. PRINTED WIRING BOARD ASSEMBLIES...................................................................................17-1
18. REPLACEMENT PARTS LIST......................................................................................................18-1
19. PACKING OF THE SET ................................................................................................................19-1
CONTENTS
SERVICE MANUAL DVD VIDEO PLAYER MODEL DV-550U
ON
DIGITAL
GAMMA DIGITAL
S PICTURE
POWER
OFF
IN MAX
LEVEL
PHONES
COMPACT
D I G I T A L
DOLBY
DIGITAL VIDEO
DVD / VIDEO CD / CD
This document has been published to be used for
after sales service only.
Thecontents are subjecttochangewithoutnotice.
SHARP CORPORATION

DV-550U
1-1
1. IMPORTANT SAFEGUARDS AND PRECAUTIONS
IMPORTANT SERVICE NOTES
BEFORE RETURNING THE VIDEO CASSETTE
RECORDER
Beforereturning the videocassette recorder to theuser,
perform the following safety checks.
1. Inspect all lead dress to make certain that leads are
not pinched or that hardware is not lodged between
thechassisandothermetalpartsinthevideocassette
recorder.
2. Inspect all protective devices such as non-metallic
control knobs, insulation materials, cabinet backs,
adjustmentandcompartmentcoversorshields,isola-
tion resistor/capacitor networks, mechanical insula-
tors etc.
3. To be sure that no shock hazard exists, check for
current in the following manner.
●Plug the AC line cord directly into a 120 volt AC outlet
(Do not use an isolation transformer for this test).
●Using two clip leads, connect a 1.5k ohm, 10 watt
resistorparalleledbya0.15µFcapacitorinserieswith
all exposed metal cabinet parts and a known earth
ground, such as a water pipe or conduit.
●Use an SSVM or VOM with 1000 ohm per volt, or
higher, sensitivity or measure the AC voltage drop
across the resistor (See Diagram).
●Move the resistor connection to earth exposed metal
part having a return path to the chassis (antenna,
metalcabinet,screwheads,knobsandcontrolshafts,
SSVM
AC SCALE
1.5k ohms.
10W
CONNECT TO
KNOWN EARTH
GROUND
TO EXPOSED
METAL PARTS
0.15 µF
TEST PROBE
etc.) and measure the AC voltage drop across the
resistor. Reverse the AC plug on the set and repeat
AC voltage measurements for each exposed part.
Anyreadingof 0.45V rms (thiscorrespondsto 0.3mA
rms AC.) or more is excessive and indicates a poten-
tial shock hazard which must be corrected before
returning the video cassette recorder to the owner.
WARNING :TOREDUCETHERISKOFFIREORELEC-
TRIC SHOCK, DO NOT EXPOSE THIS AP-
PLIANCE TO RAIN OR MOISTURE.
RISK OF ELECTRIC SHOCK
DO NOT OPEN
This symbol warns the user of uninsulated voltage
withintheunitthatcancausedangerouselectricshocks.
CAUTION:
CAUTION
3A 125V
This symbol alerts the user that there are important
operatingandmaintenanceinstructionsintheliterature
accompanying this unit.
This symbol mark means fast operating fuse.
For continued protection against risk of fire, replace
only with same type fuse F901 (3A, 125V).
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK. DO
NOT REMOVE COVER. NO USER-SERVICEABLE
PARTS INSIDE. REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL.

DV-550U
1-2
* * * DRAFT * * *
NOTE TO SERVICE PERSONNEL–LASER RADIATION PRECAUTIONS
This DVD video player use a laser pickup that emit a laser beam. The laser emitted from a pickup is a class II a laser and
harmful to the eyes. Therefore, do not look at the laser beam directly when servicing.
Usually the laser pickup is covered by the clamper top plate over the mechanical chassi assembly.
CAUTION – LASER RADIATION WHEN OPEN THE CLAMPER TOP PLATE
AVOID LONG-TERM VIEWING OF DIRECT LASER BEAM.
USE OF CONTROLS OR ADJUSTMENT OR PERFORMANCE OF PRODUCTS
OTHER THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION
EXPOSURE.
See the caution label on the clamper top plate as below when open the cabinet.
Elamper top plate
CAUTION: LASER RADIATION WHEN OPEN.
AVOID LONG-TERM VIEWING OF DIRECT
LASER RADIATION.
ATTENTION: RAYONNEMENT LASER EN CAS D OUVERTURE.
EVITER TOUTE EXPOSITION DIRECTE
PROLONGEE AU RAYONNEMENT LASER.
TLA830399GEZZ

DV-550U
2-1
• Plays DVD, video CD and CD (Digital Audio) discs
• Built-Dulby Digital (AC-3) decoder supporting Dolby Pro Logic* decoding and Virtual Surround
• For the audio on a DVD disc recorded in MPEG Version 2.0 format.
• Digital Gamma correction and Digital Super Picture functions
• Separate colour component output connectors (Y, Cd and Cr)
2. FEATURES
3. SPECIFICATIONS
Signal System: NTSC
Video output: Output connector: Pin-jack
Output level: 1Vp-p (75Ω)
S video output: Y output level: 1Vp-p (75Ω)
C output level: 0.286 Vp-p (75Ω)
Output connector: S connector
Component colour output: Y output level: 1Vp-p (75Ω)
Cb output level: 0.7Vp-p (75Ω)/100% colour
Cr output level: 0.7Vp-p (75Ω)/100% colour
Output connector: Pin-jack
Audio output: 5.1ch output: Front L/R, surround L/R, centre and subwoofer
Output connector: Pin-jack
Output level: 2Vrms (1kHz, 0dB)
Digital audio I/F: Optical digital output: Optical connector
Audio output: Coaxial digital output: Pin-jack
Headphone output: Output connector: Standard jack
Video signal horizontal resolution: 500 lines
S/N ratio: 60 dB
Audio signal frequency characteristics: For DVD linear PCM playback:
4Hz to 22 kHz (48 kHz sampling)
4Hz to 44 kHz (96 kHz sampling)
CD playback: 4Hz to 20 kHz (EIAJ)
S/N ratio: CD: 96dB, 1kHz (EIAJ)
Dynamic range: DVD linear PCM: 94 dB (EIAJ)
CD: 96 dB (EIAJ)
Overall harmonic distortion ratio: CD: 0.005% (EIAJ)
Pickup wave length: 650mm
Laser ouput: Max. 0.7mW
Operating temperature: 5°C to 40°C (41°F to 104°F)
Storange temperature: –20°C to 55°C (-4°F to 131°F)
Power supply : 120VAC, 60 Hz
Power consumption: 14W (0W when switched off)
Dimensions: 270 mm × 80 mm × 338 mm (W × H× D) (Including attachments)
(10-41/56" × 3-5/32" × 13-5/16")
Weight: 2.5 kg (5.6 lbs)
Specifications are subject to change without notice.
Weight and dimensions are approximate.
Digital Output
•The digital outputformat(opticalorcoaxial)used in thisDVDplayerislinearPCM audio samplingat44.1kHzor48 kHz.
Linear PCM sound for DVD video discs sampled at 96 kHz cannot be output digitally.
Check the disc jacket for information on the audio sampling used.
3-1. ACCESSORIES
Accessories: S-video code x 1, video/audio code x 1, AC power code x 1, UM3 battery x 2, Remote Control x 1

DV-550U
4-1
For details on the use of each control.
4. PART NAMES
14
Remote Sensor

DV-550U
4-2

DV-550U
5. MAINTENANCE CHECK ITEMS AND EXECUTION TIME
5-1
Parts Maintained 1,000 hrs. 2,000 hrs.
Pickup
Spindle Unit
Sled Motor
Loading Motor
Belt
Note : Part Replacement
: Cleaning
(For cleaning, use a lint-free cloth danpened with pure isopropyl alcohol.)
Use the following table as a guide to maintain the mechanical parts in good operating condition.
CARES WHEN USING THE PICKUP
1. The laser light having wavelength 650 nm is emitted from the objective lens. BE CAREFUL SO THAT THE LASER
LIGHT DOES NOT ENTER DIRECTLY INTO YOUR EYE.
2.Thesemiconductorlasermaybeeasilydamagedbyelectrostaticcharges.Whenhandlingthepickup,takecaresothat
the electrostatic charge is not generated.
3. The semiconductor laser may be easily damaged by overcurrent. Use the power supply unit which does not give any
spike current when the power is turned on and off.
4. Carefully remove the dust and dirt from the objective lens with the lens blower.
When handling the objective lens, take due care so that it is not contaminated with fingerprint, etc. If the objective lens
is contaminated, impregnate the cleaning paper with a small quantity of solvent (isopropyl alcohol), and gently wipe to
clean.
5. The ozone layer depleting components (ODC) are not used in the production process for the product.
MECHANICAL PARTS REGUIRING PERIODICAL INSPECTION

DV-550U
6-1
(F) x4
(D)
(B) x2
(E)
Screw x3
Front panel
Screw x2
(C)
(W)
(X)
(T) x2
Volume PWB
LED PWB
Operate PWB
(U) x2(V) x3
(L)
(S)
(S)
(G)
(H)
(J)
(L)
(P) x2
Mechanism
Main PWB
Display PWB
Terminal/
Power PWB
(Q) x2
(R) x2
(N)
(M) x5
(L)
(K) x2
3.Remove one screw (C).
4.Release the hooks of the front panel at two places on both sides
andatthreeplacesonthebottom,andslidethefrontpaneltoward
you.
5.Disconnect the connectors (D) and (E).
6.Remove four screws (F) which installs the mechanical unit.
7.Disconnect the lead lines (G) and (H) and (J) from the main PWB
under the mechanism.
8.Removetwoscrews(K)onbothsidesoftheterminal angleframe.
9.Remove three screws (L) which install the terminal/power PWB.
10.Remove five screws (M) and one screw (N) which install the
terminal block.
11.Remove two screws (P) of the display PWB.
12.Remove two screws (Q) of the decorative leg.
13.Push out the middle pin (R) of the setting leg in the direction
opposite to insertion. (Two places)
14.Remove two screws (S) which install the main PWB under the
mechanical unit.
15.Removetwoscrews(T)whichinstallthevolumePWBofthefront
panel.
16.Remove the LED PWB and two holder screws (U).
17.Remove three screws (V) which install the operate PWB.
*The spacer and insulation seat under the indication tube of (W)
and (X) are bonded with both-side sticking tape.
6-1. DISASSEMBLY
1.Remove five screws (A), and remove the cabinet.
Note: When assembling it, tighten the screws in order of 1 - 5 .
(Because the set may rise a little by tightening the screws.)
2.Remove two screws (B).
6. DISASSEMBLY AND REPLACEMENT OF MAIN PARTS
Top Cabinet
(A) x2
(A)
(A) x2
1
2 5
3
4

DV-550U
6-2
6-2. REPLACEMENT OF MAIN PARTS
<Disassembling and assembling procedure>
· Removing the tray (emergency ejection)
Removing the tray lock (set state)
4.Disassembling the mechanism chassis moving chassis assembly
(1) Remove the four M2.6 screws A , and remove the clamped top plate B .
Insert a thin plate into the hatching part, slowly move the it in the arrow direction so that the tray is moved out a little in
the arrow direction.
Note: In this state the tray cannot be removed completely.
· Drive Unit State
VIDEO
Tray Decoration Panel
Slowly move in the arrow direction, using the screwdriver having a fine head.
<Disassembling and assembling the mechanism chassis>
1.Remove the pickup FPC and loading relay FFC A from the main PWB.
Note: Fit the conductive rubber cap to the front end of pickup FPC (short-circuit).
2.Remove the solder joint of loading relay PWB at drive unit rear side.
1 Sled motor lead wire (Yellow·Orange)
2 IN SW lead wire 2 (Brown)
3 Spindle motor lead wire (Red·Black)
4 Loading motor lead wire (Red·Black)
5 Remove each lead wire from the claw.
3.Remove the relay PWB mounting screw B (M2.6S + 6S S tight), and remove the relay PWB C .
VIDEO
Tray Decoration Panel
Intermediate PWB
Rear side of moving chassis assembly
ph.2
1
1
2
3
4
3
2
4
A
B
C
SLmotor 1 SLmotor 2 SW GND SP1 SP2
L motor2
L motor2
Black
Red
Red
Black
Brown Brown
Orange
Yellow
Remove the lead wire.
Remove the lead wire.
P tight screw
with M2.6 washer
AA
B
Clamper top
plate rear side

DV-550U
6-3
(2) Remove the M2.6 screw C .
(3) Holding aslant upward the mechanism chassis moving chassis assembly D in the arrow direction, remove.
Note:The slide rack E must be moved to the left side as shown in diagram.
Take care so that the lead wires, especially the earth sponge G at the pickup FPC F front end, must not be
removed.
5.Disassembling the loading drive system
(1) Remove the two M2 screws A . (4) Relay gear 2 E .
(2) Remove the tray pinion B . (5) Remove the two M1.7 screws F .
(3) Remove the relay gear 1 C together with the (6) Remove the L motor G (with pulley) downward.
timing belt S D .
M2
M1.7
L·Motor Pulley
L·Motor
Timing belt S
Relay
gear1 Relay
gear2
Tray pinion
A
B
E
C
D
G
F
Insulator
Insulator
Insulator
Insulator
Mechanism chassis
P tight screw with
M2.6 washer
C
B
A
B
C
6.Disassembling the mechanism chassis from the moving chassis
(1) Remove the M2.6 screw A .
(2) Remove the insulator B (2 pcs. at the right side in diagram) parallel in the arrow direction.
(At this time it is better to insert the fine head of screw driver at the ID side of insulator and to move in the arrow
direction, which facilitates removal.)
(3) Remove the mechanism chassis in the arrow direction, pulling upward aslant.
At this time take care so that the insulator C (left side, 2 pcs.) is not damaged. (Do not put at once the mechanism
chassis assembly.)
Slide rack
Mechanism chassis moving
chassis assembly
P tight screw with
M2.6 washer
G
C
F
E
D