Belson BSA-3750 User manual

C.E.C BELSON/DPTO.TECNICO/BSA-3750/Ed.01

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Table of Contents
1.Genernal Section 3
Cautions and Warnings 3
Precautions 3
Test Equipment / Jigs 4
Specifications 4
Disassembly Instructions 7
2.Servise and Special Functions 9
Software Upgrade 9
Initialization of the Set 9
3.Layout of PCBs and Circuit Diagrams 9
4.IC Block Diagrams 18
5.Exploded View and Spare Parts Lists 36

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1. General Sections
Cautions and Warnings
Product Safety Notice
Parts marked with the symbol ! in the schematic diagram have critical
characteristics.
Use ONLY replacement parts recommended by the manufacturer. It
is recommended that the unit be operated from a suitable DC supply or
batteries during initial check out procedures.
Leakage Current Check/Resistance Check
Before returning the unit to the customer, make sure you make either (1) a leakage current check or
(2) a line to chassis resistance check. If the leakage current exceeds 0.5 milliamps, or if the resistance
from chassis to either side of the power cord is less than 240 K ohms, the unit is defective.
WARNING: DO NOT return the set to the customer until the problem or located is corrected.
Protection of Eyes from Laser Beam
To protect eyes from invisible laser beam during servicing
DO NOT LOOK AT THE LASER BEAM
Laser Caution
This Digital Video Disc Player employs a Laser System. To prevent direct exposure to the laser
beam, do not try to open the enclosure.
Visible laser radiation emits when open and interlocks are defeated.
Use of controls or adjustments or performance of procedures other than those specified herein may
result in hazardous radiation exposure. This CD Changer must be adjusted and repaired only by
qualified service personnel.
DO NOT STARE INTO BEAM.
Laser symbol:
THIS IS COMPACT DISC PLAYER IS CLASSIFIED AS A CLASS 1 LASER PRODUCT.
THE LASS 1 LASER PRODUCT LABEL IS LOCATED ON THE REAR EXTERIOR.
Precautions
1. ESD Precautions in Repairing
1.1 Do not apply excessive pressure on the mechanical parts (moving parts), including the Pickup
Block, as extremely high mechanical precision or required in these parts.
1.2 When soldering the microprocessor and signal processing IC’s, use a ceramic soldering iron or
a soldering iron whose metal part is grounded since they are not resistant to static electricity.
1.3 When removing the solder or soldering the laser shorting lands for the Pickup Block, use a
ceramic soldering iron or a soldering iron whose metal part is grounded since the laser diode or not
resistant to static electricity.
2. DVD Loading Unit Precautions when handling the Mechanism Block
2.1 Do not loosen any screws in the Pickup Block.

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2.2 Do not adjust any screws in the Mechanism Block except for “Tilt Adjust Screws”, as they are
adjusted precisely at the factory.
2.3 Replacement of the Pickup Block is impossible. Always replace the Traverse Ass’y when the
Pickup Block needed to be replaced. Do not touch the lens or lens holder of the Pickup Block.
2.4 The Guide Rails of the Pickup Block are greased. Take care when handing.
2.5 When you try to slide the Pickup Block, do not press or pull it directly. Always turn the dive gears
with your fingers.
2.6 Be sure that the anti-slipping rubber on the turntable or clean. If there is dust or it is greasy, clean
the part with the liquid that contains 50% each of alcohol and water.
When removing the Mechanism P.C.B. Ass’y, you need to short-circuit the laser diode shorting
lands beforehand.
Test Equipment / Jigs
Variable isolating transfomer, Dual channel oscilloscope, Digital multimeter
Specification
1 Chassis
Laser concept 2 laser for DVD and VCD
2 Disc formats
DVD+R Yes
DVD-R Yes
DVD+RW Yes
DVD-RW Yes
CD-R Yes
CD-RW Yes
3 Media formats
DVD-Video Yes
Audio CD Yes
Video CD VCD 1.0,1.1,2.0
S-Video CD Yes
CD-ROM DivX,MPEG4,MP3, JPEG, Kodak Picture CD,WMA
4 Player features
Parental control Yes, numerical lock
Screen saver Yes
Picture mode select Yes
Video strobe Yes
Video filter Yes
File browser DivX, MP3, JPEG, Kodak Picture CD,WMA
5 Player functions
Play/stop/pause Yes/Yes/Yes

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Next/previous(skip) Yes/Yes
Fast forward/reverse Yes/Yes (DVD,MP3,WMA : 2X / 4X / 6X / 8X ,
VCD,CDDA:1X / 2X / 3X / 4X, DivX: 2X / 4X / 8X / 16X
)
Zoom DVD/VCD 2X/3X/4X,JPEG 1.5X/2X/1/2/1/4
Slow motion forward /reverse YES/YES(DVD,VCD:1/2,1/4,1/8)
Perfect still picture Yes
Frame advance /reverse Yes/Yes
Repeat CD /DVD DVD: title -chapter-A/B;VCD,CD: A/B-repeat one-repeat
all
Random play CDDA, MP3,WMA
Program play CDDA,DVD,JPEG,MP3,WMA
Last memory( resume) Yes
6 Region Code
Region code changed by request.
7 OSD
OSD style standard
OSD language English, German, Dutch, French, Italian, Spanish, Portugu-
ese
Subtitle Language English, German, Dutch, French
Welcome Logo and OSD back-
ground
Provided by Customer
8 Audio out
Digital Audio decoder Dolby digital AC-3, MPEG 2, PCM, MP3
Digital Audio output Dolby digital AC-3, DTS, MPEG, PCM 48/96 KHz
Analog Audio output Dolby Prologic II (down mix), Stereo; Dolby digital AC-3;
5.1CH
Audio D/A converter 24 Bit/96kHz
Virtual surround Sound Yes
Digital sound process Yes
Frequency range DVD 48/96
kHz
4 Hz-22 kHz/ 4 Hz- 44 kHz
Frequency range CD 44.1 kHz 4 Hz-20 kHz
Dynamic range 1 kHz ≥80 Db(weighted)
Crosstalk ≥80 dB(weighted)
Signal noise ≥90 dB(weighted)
9 Video out
Video D/A converter 10 Bit / 54 MHz
Progressive Video out PAL / NTSC
PAL Yes, 625 lines / 50Hz / 4.43 MHz