Sony - MDS-JB940 - Minidisc player
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Sony MDS-JB940
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Equipment:
MDS-JB940
Date:
2000
Category:
Group:
Sub Group:
Information
System MiniDisc digital Audio system Disc MiniDisc
Laser Semiconductor laser (λ = 780 nm)
Emission duration: continuous
Laser output MAX 44.6 μW1)
1) This output is the value
measured at a distance of
200 mm from the objective lens
surface on the Optical Pick-up
Block with 7 mm aperture.
Laser diode Material: GaAlAs
Revolutions (CLV) 400 rpm to 900 rpm
Error correction ACIRC (Advanced Cross Interleave
Reed Solomon Code)
Sampling frequency 44.1 kHz
Coding ATRAC (Adaptive TRansform
Acoustic Coding)/ATRAC 3
Modulation system EFM (Eight-to-Fourteen
Modulation)
Number of channels 2 stereo channels
Frequency response 5 to 20,000 Hz ±0.3 dB
Signal-to-noise ratio Over 100 dB during play
Wow and flutter Below measurable limit
ANALOG IN Jack type: phono
Impedance: 47 kilohms
Rated input: 500 mVrms
Minimum input: 125 mVrms
1 Manual
Service manual
Manual type:
Service manual
Pages:
74
Size:
18.8 MB
Language:
english
Revision:
Manual-ID:
9-929-274-11
Date:
Quality:
Electronic document, no scan, very well readable.
Upload date:
June 22, 2011
MD5:
5516cb02-6996-fb46-5f03-d6654a2b83f4
Information
TABLE OF CONTENTS
MODEL IDENTIFICATION
— BACK PANEL —
Model
AEP, UK models
Canadian model
US model
Part No.
4-228-507-0s
4-228-507-1s
4-228-507-2s
Part No.
SELF-DIAGNOSIS FUNCTION ········································ 4
1. SERVICE NOTE ······························································· 6
2. GENERAL ········································································ 11
3. DISASSEMBLY ······························································ 14
4. TEST MODE··································································· 17
5. ELECTRICAL ADJUSTMENTS ······························ 22
6. DIAGRAMS
6-1. Block Diagram MAIN Section ································ 31
6-2. Block Diagram DISPLAY/POWER Section ··········· 32
6-3. Note for Printed Wiring Boards and
Schematic Diagrams ···················································· 33
6-4. Circuit Board Location ················································ 33
6-5. Waveforms ··································································· 34
6-6. Printed Wiring Board BD Board ····························· 35
6-7. Schematic Diagram BD Board (1/2) ······················· 36
6-8. Schematic Diagram BD Board (2/2) ······················· 37
6-9. Printed Wiring Board HP Board/KEY Board ·········· 38
6-10. Schematic Diagram HP Board/KEY Board ············ 38
6-11. Schematic Diagram MAIN Board (1/3) ·················· 39
6-12. Schematic Diagram MAIN Board (2/3) ·················· 40
6-13. Schematic Diagram MAIN Board (3/3) ·················· 41
6-14. Printed Wiring Board MAIN Board (Side A) ·········· 42
6-15. Printed Wiring Board MAIN Board (Side B) ·········· 43
6-16. Printed Wiring Board PANEL Section ···················· 44
6-17.Schematic Diagram PANEL Section ······················· 45
6-18.Schematic Diagram AC Board ································ 46
6-19. Printed Wiring Board AC Board ······························ 47
6-20. IC Block Diagrams ······················································ 48
6-21. IC Pin Function Description ········································ 53
7. EXPLODED VIEWS ······················································ 60
8. ELECTRICAL PARTS LIST ······································· 64
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