BBK BBK938S Manuale utente
SERVICE MANUAL
BBK938S
CONTENTS
1. SAFETY PRECAUTIONS 1
2. PREVENTION OF ELECTRO STATIC DISCHARGE(ESD)TO ELECTROSTATICALLY
SENSITIVE(ES)DEVICES 1
4. PREVERTION OF STATIC ELECTRICITY DISCHARGE 4
5. ASSEMBLING AND DISASSEMBLING THE MECHANISM UNIT 5
5.1 OPTICAL PICKUP UNIT EXPLOSED VIEW AND PART LIST 5
5.2 BRACKET EXPLOSED VIEW AND PART LIST
7
6. ELECTRICAL CONFIRMATION 9
6.1 VIDEO OUTPUT (LUMINANCE SIGNAL) CONFIRMATION 9
6.2 VIDEO OUTPUT(CHROMINANCE SIGNAL) CONFIRMATION 10
7. MPEG BOARD CHECK WAVEFORM 11
8. IC BLOCK DIAGRAM & DESCRIPTION12
9. SCHEMATIC & PCB WIRING DIAGRAM 41
10. SPARE PARTS LIST 55
8.1 MT1336 12
8.2 MT137920
8.3 U214 HY29F800 36
8.4 U203 SDRAM-HY57V1610D 39
3. CONTROL BUTTON LOCATIONS AND EXPLANATIONS 2
5.3 MISCELLANEOUS 8
1.1 GENERAL GUIDELINES
1. When servicing, observe the original lead dress. if a short circuit is found, replace all parts which have
been overheated or damaged by the short circuit.
2. After servicing, see to it that all the protective devices such as insulation barrier, insulation papers
shields are properly installed.
3. After servicing, make the following leakage current checks to prevent the customer from being exposed
to shock hazards.
Some semiconductor(solid state)devices can be damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive(ES)Devices. Examples of typical ES devices are integrated
circuits and some field-effect transistors and semiconductor chip components. The following techniques
should be used to help reduce the incidence of component damage caused by electro static discharge(ESD).
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain
off any ESD on your body by touching a known earth ground. Alternatively, obtain and wear a commercially
availabel discharging ESD wrist strap, which should be removed for potential shock reasons prior to
applying power to the unit under test.
2. After removing an electrical assembly equipped with ES devices,place the assembly on a conductive
surface such as alminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as anti-static
(ESD protected)can generate electrical charge sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES
devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are
ready to install it.(Most replacement ES devices are packaged with leads electrically shorted together by
conductive foam, alminum foil or comparable conductive material).
7. Immediately before removing the protective material from the leads of a replacement ES device, touch
the protective material to the chassis or circuit assembly into which the device will be installed.
Caution
Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion
such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can
generate static electricity(ESD).
notice (1885x323x2 tiff)
1. SAFETY PREAUTIONS
2.PREVENTION OF ELECTRO STATIC DISCHARGE(ESD)TO
ELECTROSTATICALLY SENSITIVE(ES)DEVICES
1
Front Panel Illustration
4DIRECTION Arrow 9VFD display window
5ECHO adjustment knob OPEN/CLOSE button
10
2Disc tray 7MIC 1 jack PAUSE Button
12
POWER switch 6MIC VOLUME knob PLAY Button
11
8
MIC 2 jack STOP Button
13
3Playback Indicator
4
3
7 8 9 10 11 12 136
5
2
2
3.Control Button Locations and Explanations
1 2 3
456
7 8 9
SELECT
+10 0
6
3
2
5
7
8
9
12
11
13
14
16
35
33
34
22
20
21
19
23
24
30
29
25
26
27
28
15
17
18
4
32
31
10
SUBTITLE
OSD
AUDIO ANGLE MUTEGOTO
STANDBY EJECT
RC-15
Press once to stand by, Press twice to play.
Display or hid disc information.
Fast forward play.
DVD title.
Normal playback.
Function Setup.
Switch the TV system between PAL, NTSC
and AUTO.
Stop playback.
Program playback titles.
Repeat the select.
Play from the desired location.
Rise tone.
Decrease volume.
Increase volume.
Repeat play.
Back to the previous menu.
Skip backward.
Skip forward.
Pause or play frame by frame.
Power Spectrum Meter on/off.
Zoom in the displayed frame.
JPEG Display Mode.
Slow play.
STANDBY Button
OSD Button
2
Fast backward play.
FWD Button
14
GOTO Button
3
NUMBER Buttons
5
6TITLE Button
CURSOR Buttons
7
REV Button
13
10 PROG Button
STOP Button
11
PLAY Button
12
SLOW Button
15
Change the audio language or audio channel.
AUDIO Button
4
VOLUME -
19
VOLUME +
20
KEY Button
18
NEXT Button
24
PREV Button
23
22 RETURN Button
REPEAT Button
21
8SETUP Button
P/N Button
9
A-B Button
16
25 PAUSE/STEP Button
Fall tone.
KEY Button
17
PSM Button
26
ZOOM Button
27
28 MODE Button
SELECT Button
29
Display DVD menu or open/close PBC.
MENU Button
30
Change camera angle, MP3/JPEG playback
modes switch.
Clear error input numbers.
CLEAR Button
27
31
Press once to mute, twice to unmute.
Change subtitle language, Switch JPEG display
modes.
Open or close the disc tray.
MUTE Button
33
SUBTITLE Button
34
EJECT Button
35
ANGLE Button
32
3
The laser diode in the traverse unit (optical pickup)may brake down due to static electricity of clothes or human
body.Use due caution to electrostatic breakdown when servicing and handling the laser diode.
4.1.Grounding for electrostatic breakdown prevention
Some devices such as the DVD player use the optical pickup(laser diode)and the optical pickup will be damaged
by static electricity in the working environment.Proceed servicing works under the working environment where
grounding works is completed.
4.1.1. Worktable grounding
1. Put a conductive material(sheet)or iron sheet on the area where the optical pickup is placed,and ground the
4.1.2.Human body grounding
1 Use the anti-static wrist strap to discharge the static electricity from your body.
4.1.3.Handling of optical pickup
1. To keep the good quality of the optical pickup maintenance parts during transportation and before
installation, the both ends of the laser diode are short-circuited.After replacing the parts with new ones,
remove the short circuit according to the correct procedure. (See this Technical Guide).
2. Do not use a tester to check the laser diode for the optical pickup .Failure to do so willdamage the laser
diode due to the power supply in the tester.
4.2. Handling precautions for Traverse Unit (Optical Pickup)
1. Do not give a considerable shock to the traverse unit(optical pickup)as it has an extremely high-precise
structure.
2. When replacing the optical pickup, install the flexible cable and cut is short land with a nipper. See the
optical pickup replacement procedure in this Technical Guide. Before replacing the traverse unit, remove
the short pin for preventingstatic electricity and install a new unit.Connect the connector as short times as
possible.
3. The flexible cable may be cut off if an excessive force is applied to it.Use caution when handling the cable.
4. The half-fixed resistor for laser power adjustment cannot be adjusted. Do not turn the resistor.
safety_3 (1577x409x2 tiff)
sheet.
4
4.PREVENTION OF STATIC ELECTRICITY DISCHARGE
5.1 Optical pickup Unit Explosed View and Part List
Pic (1)
5. Assembling and disassembling the mechanism unit
5
Materials to Pic (1)
No. PARTS CODE PARTS NAME Q ty
14692200 SF-HD60 1
1 1EA0311A06300 ASSY, CHASSIS, COMPLETE 1
2 1EA0M10A15500 ASSY, MOTOR, SLED 1
Or 1EA0M10A15501 ASSY, MOTOR, SLED 1
3 1EA2451A24700 HOLDER, SHAFT 3
4 1EA2511A29100 GEAR, RACK 1
5 1EA2511A29200 GEAR, DRIVE 1
6 1EA2511A29300 GEAR, MIDDLE, A 1
7 1EA2511A29400 GEAR, MIDDLE, B 1
8 1EA2744A03000 SHAFT, SLIDE 1
9 1EA2744A03100 SHAFT, SLIDE, SUB 1
10 1EA2812A15300 SPRING, COMP, TYOUSEI 3
11 1EA2812A15400 SPRING, COMP, RACK 1
21 1EA0B10B20100 ASSY, PWB 1
Or 1EA0B10B20200 ASSY, PWB 1
31 SEXEA25700--- SPECIAL SCREW BIN+-M2X11 3
32 SEXEA25900--- SPECIAL SCREW M1.7X2.2 2
33 SFBPN204R0SE- SCR S-TPG PAN 2X4 2
34 SFSFN266R0SE- SCR S-TPG FLT 2.6X6 1
35 SWXEA15400--- SPECIAL WASHER 1.8X4 X0.25 2
Note : This parts list is not for service parts supply.
6
5.2 Bracket Explosed View and Part List
Pic (2)
Materials to Pic(2)
1.bracket 14.frontsiliconrubber
2.belt15.Backsiliconrubber
3.screw 16.Pick-up
4.beltwheel 17.Pick-up
5.gearwheel 18.switch
6.ironchip 19.Five-pinflatplug
7. Immobility mechanism equipment 20. screw
8.Magnet 21.PCB
9.Platen 22.motor
10.Bridgebracket 23.Motorwheel
11.screw 24.screw
12.screw 25.tray
13. Big bracket
Before going process with disassembly and installation, please carefully both
peruse the chart and confirm the materials.
7
5.3 MISCELLANEOUS
5.3.1 Protection of the LD(Laser diode)
Short the parts of LD circuit pattern by soldering.
5.3.2 Cautions on assembly and adjustment
Make sure that the workbenches,jigs,tips,tips of soldering irons and measuring instruments are
grounded,and that personnel wear wrist straps for ground.
Open the LD short lands quickly with a soldering iron after a circuit is connected.
Keep the power source of the pick-up protected from internal and external sources of electrical
noise.
Refrain from operation and storage in atmospheres containing corrosive gases (such as H2S,SO2,
NO2 and Cl2)or toxic gases or in locations containing substances(especially from the organic silicon,cyan,
formalin and phenol groups)which emit toxic gases.It is particularly important to ensure that none of the
above substances are present inside the unit.Otherwise,the motor may no longer run.
8
Indice
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