Page 1
Ð 2 Ð
Specifications ........................................................................... 1
1. SERVICE NOTE ........................................................... 3
2. GENERAL ...................................................................... 5
3. DISASSEMBLY
3-1. Cabinet (Front) ASSY, Cabinet (Rear) ASSY .......... 21
3-2. Left Key Board, Front Key Board, Top Key board,
Right Key Board, Relay Board ................................. 22
3-3. FL Board, Trans Board ............................................. 22
3-4. Tuner Board, FM ANT Board, AM ANT Board ....... 23
3-5. MD Chassis ASSY ................................................... 23
3-6. MD Block ASSY, Filter Board ................................. 24
3-7. Audio Board, HP Board, Line in Board .................... 24
3-8. Main Board, CD Block ASSY .................................. 25
3-9. Shield Case (Top), Shield Case (Bottom) ................. 25
3-10. DG Board, BD Board, MD Mechanism Deck ........ 26
3-11. Shutter ASSY .......................................................... 26
3-12. SW Board ............................................................... 27
3-13. Slider ASSY, ÒHead, Over WriteÓ .......................... 27
3-14. MD Optical Pick-up Block ..................................... 28
3-15. Loading Board, ÒTray ASSY, CDÓ ......................... 29
3-16. CD Optical Pick-up Block, Pick-up Relay Board .. 29
4. TEST MODE
4-1. Caution When Using the Test Mode ......................... 30
4-2. Test Mode Settings ................................................... 30
4-3. Releasing the Test Mode ........................................... 30
4-4. Basic Operations of the Test Mode ........................... 30
4-5. Selecting the Test Mode ............................................ 30
4-6. Functions of Other Buttons ...................................... 31
4-7 Test Mode Display ..................................................... 31
5. ADJUSTMENTS
5-1. Cautions When Checking Laser Diode Emission ..... 32
5-2. Cautions When Handling
the Optical Pick-up (KSM-260A) ............................ 32
5-3. Cautions During Adjustment .................................... 32
5-4. Creating a Continuous Recording Disk .................... 32
5-5. Temperature Compensation Offset Adjustment ........ 33
TABLE OF CONTENTS
Recording/Playback time
Maximum 74 minutes (with MDW-74)
Revolutions
400 rpm to 900 rpm (CLV)
Error correction
Advanced Cross Interleave Reed Solomon Code (ACIRC)
Sampling frequency
44.1 kHz
Cording Adaptive Transform Acoustic Cording (ATRAC)
Modulation system
EFM (Eight-to-Fourteen Modulation)
Number of programme positions
2 stereo programme positions
Frequency response
20 Ð 20,000 Hz +1 /Ð2 dB
Signal-to-noise ratio
Over 80 dB (during playback)
Wow and flutter
Below measurable limit
General
Speaker
Full range : 8 cm (3 in.) dia., 4ohms, cone type (2)
Inputs
LINE IN (stereo minijack) : Sensitivity 436 mV/691 mVOutputs
Headphones jack (stereo minijack) (2) : For 32 ohms
impedance headphones
Power outputs
7 W + 7 W
Power requirements
For personal minidisc system :
US Model :120V AC, 60Hz
EXCEPT US Model :230V AC, 50Hz
For remote commander :
3V DC, 2 size AA (R6) batteries
Power consumption
30 W
Dimensions (incl. projecting parts)
Approx. 528 x 275 x 139 mm (w/h/d)
(20
7/8 x 10 7/8 x 5 1/2 inches)
Mass approx. 6.4 kg (14 lb. 2 oz)
Supplied accessories
Remote commander (1)
AM loop aerial (1) (US Model)
MW/LW loop aerial (1) (EXCEPT US Model)
Speaker nets (2) (EXCEPT US Model)
Design and specifications are subject to change without notice.
5-6. Laser Power Adjustment ........................................... 33
5-7. Traverse Adjustment ................................................. 33
5-8. Focus Bias Adjustment ............................................. 34
5-9. Error Rate Check ...................................................... 35
5-10. Focus Bias Check ................................................... 35
5-11. Adjustment and Connection Locations ................... 35
6. DIAGRAMS
6-1. Explanation of IC Terminals ..................................... 39
6-2. Block Diagram (1) .................................................... 46
6-3. Block Diagram (2) .................................................... 49
6-4. Printed Wiring Boards ÐMain Section Ð ................... 55
6-5. Schematic Diagram ÐMain Section (1/2) Ð .............. 59
6-6. Schematic Diagram ÐMain Section (2/2) Ð .............. 63
6-7. Printed Wiring Boards
ÐTuner Section (US Model) Ð .................................. 67
6-8. Schematic Diagram
ÐTuner Section (US Model) Ð ................................... 69
6-9. Printed Wiring Boards
ÐTuner Section (EXCEPT US Model) Ð ................... 72
6-10. Schematic Diagram
ÐTuner Section (EXCEPT US Model) Ð .................. 74
6-11. Schematic Diagram ÐBD Section Ð ........................ 77
6-12. Printed Wiring Boards ÐBD Section Ð .................... 79
6-13. Schematic Diagram ÐPower Section Ð ................... 82
6-14. Printed Wiring Boards ÐPower Section Ð ............... 85
6-15. Schematic Diagram ÐDG Section Ð ........................ 87
6-16. Printed Wiring Boards ÐDG Section Ð ................... 90
6-17. Printed Wiring Boards ÐFront Key Section Ð ......... 93
6-18. Schematic Diagram ÐFront Key Section Ð ............. 97
7. EXPLODED VIEWS
7-1. Front Cabinet Section ............................................. 106
7-2. Rear Cabinet Section .............................................. 107
7-3. Chassis Section ....................................................... 108
7-4. MD Section (1) ....................................................... 109
7-5. MD Section (2) ........................................................ 110
7-6. CD Section ............................................................... 111
7-7. Optical Pick-up Section ........................................... 112
8. ELECTRICAL PARTS LIST .................................. 113
Page 2
Ð 3 Ð
SAFETY CHECK-OUT (US Model)
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer :
Check the antenna terminals, metal trim, ÒmetallizedÓ knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5mA (500 microampers).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturersÕ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The ÒlimitÓ indication is 0.75V,
so analog meters must have an accurate low-voltage scale. The
Simpson 250 and Sanwa SH-63Trd are examples of a passive
VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission, ob-
serve more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
1. Close the lid for CD.
2. Press CD ^ button.
3. Confirm the laser diode emission while observing the objecting
lens. When there is no emission, Auto Power Control circuit or
Optical Pick-up is broken.
Objective lens moves up and down once for the focus search.
AC
voltmeter
(0.75V) To Exposed Metal
Parts on Set
Earth Ground 0.15 mF 1.5k W
Fig. A. Using an AC voltmeter to check AC leakage.
CAUTION DURING WHEN MOUNTING THE PULLEY
FOR THE LOADING MOTOR
Make the following adjustment when mounting the loading motor
(part number : 1-698-999-11) and motor pulley (part number : 2-
627-174-01) of the CD section.
Specification : A = 0.9 to 1.1mm
SECTION 1
SERVICE NOTE
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH
MARK !ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN
SUPPLEMENTS PUBLISHED BY SONY.
Flexible Circuit Board Repairing
¥ Keep the temperature of the soldering iron around 270¡C during
repairing.
¥ Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
¥ Be careful not to apply force on the conductor when soldering or
unsoldering.
Notes on chip component replacement
¥ Never reuse a disconnected chip component.
¥ Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
