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SERVICE MANUAL
FM/AM (MW/LW) MINIDISC PLAYER
US Model
MDX-CA680X
AEP Model
UK Model
MDX-CA680/CA680X
SPECIFICATIONS
MDX-CA680/CA680X
Photo: MDX-CA680X (US model)
Ver 1.1 2001.05
9-870-242-12
Sony Corporation
2001E0500-1
e Vehicle Company
C
2001.5
Shinagawa Tec Service Manual Production Group
U.S. and foreign patents licensed from Dolby laboratories
Licensing Corporation.
AUDIO POWER SPECIFICATIONS (US model)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
23 watts per channel minimum continuous average power into 4 ohms,
4 channels driven from 20 Hz to 20 kHz with no more than 5% total
harmonic distortion.
MD Player section
Signal-to-noise ratio
90 dB
Frequency response
10 ­ 20,000 Hz
Wow and flutter
Below measurable limit
Laser Diode Properties (US model)
Material
GaAlAs
Wavelength
780 nm
Emission Duration
Continuous
Laser output power
Less than 44.6
µW*
* This output is the value measured at a distance of
200 mm from the objective lens surface on the
Optical Pick-up Block.
Tuner section
FM
T
US model:
AEP, UK models:
uning range
87.5 ­ 107.9 MHz
87.5 ­ 108.0 MHz
Antenna terminal
External antenna connector
Intermediate frequency
10.7 MHz/450 kHz
Usable sensitivity
8 dBf
Selectivity
75 dB at 400 kHz
Signal-to-noise ratio
66 dB (stereo),
72 dB (mono)
Harmonic distortion at 1 kHz
0.6 % (stereo),
0.3 % (mono)
Separation
35 dB at 1 kHz
Frequency response
30 ­ 15,000 Hz
AM (US model)
Tuning range
530 ­ 1,710 kHz
Antenna terminal
External antenna connector
Intermediate frequency
10.7 MHz/450 kHz
Sensitivity
30
µV
Power amplifier section
Outputs
Speaker outputs
(sure seal connectors)
Speaker impedance
4 ­ 8 ohms
Maximum power output
50 W
× 4 (at 4 ohms)
General
Outputs
Audio outputs (front/rear)
Power antenna relay control
lead
Power amplifier control lead
Inputs
Telephone ATT control lead
BUS control input
connector
BUS audio input connector
Remote controller input
connector
Antenna input connector
T
US model:
one controls
Bass
±10 dB at 100 Hz
Treble
±10 dB at 15 kHz
AEP, UK models:
Bass
±9 dB at 100 Hz
Treble
±9 dB at 10 kHz
Power requirements
12 V DC car battery
(negative ground)
Dimensions
Approx. 178
× 50 × 177 mm
(7 1/8
× 2 × 7 in.)
(w/h/d)
Mounting dimensions
Approx. 182
× 53 × 161 mm
(7 1/4
× 2 1/8 × 6 3/8 in.)
(w/h/d)
Mass
Approx. 1.2 kg
(2 lb 10 oz)
Supplied accessories
Parts for installation and
connections (1 set)
Front panel case (1)
Note
This unit cannot be connected to a digital preamplifier
or an equalizer.
Design and specifications are subject to change
without notice.
MW/LW (AEP, UK models)
Tuning range
MW: 531 ­ 1,602 kHz
LW: 153 ­ 279 kHz
Aerial terminal
External aerial connector
Intermediate frequency
10.7 MHz/450 kHz
Sensitivity
MW: 30
µV
LW: 40
µV
Model Name Using Similar Mechanism
NEW
Base Mechanism Type
MG-164MA-138
Optical Pick-up Name
KMS-241C


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2
MDX-CA680/CA680X
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.
Flexible Circuit Board Repairing
· Keep the temperature of the soldering iron around 270 °C dur-
ing 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 HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 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 PUB-
LISHED BY SONY.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down 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
Never look into the laser diode emission from right avove when
checking it for adustment. It is feared that you will lose your sight.
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
(KMS-241C).
The laser diode in the optical pick-up block may suffer electro-
static break-down easily. When handling it, perform soldering
bridge to the laser-tap on the flexible board. Also perform mea-
sures against electrostatic break-down sufficiently before the op-
eration. The flexible board is easily damaged and should be
handled with care.
laser-tap
OPTICAL PICK-UP FLEXIBLE BOARD
1.
GENERAL
Location of Controls .......................................................
3
Setting the Clock .............................................................
4
2.
DISASSEMBLY
2-1. Disassembly Flow ........................................................... 10
2-2. Sub Panel Assy ................................................................ 10
2-3. Mechanism Deck (MG-164MA-138) ............................. 11
2-4. MAIN Board ................................................................... 11
2-5. Heat Sink ......................................................................... 12
2-6. SERVO Board ................................................................. 12
2-7. MD Cover Assy ............................................................... 13
2-8. Float Block ...................................................................... 13
2-9. Lo Motor Assy (Loading) (M903) .................................. 14
2-10. Lever (LE23) Assy .......................................................... 14
2-11. Holder Assy ..................................................................... 15
2-12. Chucking Arm Assy ........................................................ 15
2-13. Optical Pick-up (KMS-241C) ......................................... 16
2-14. SL Motor Assy (Sled) (M902),
SP Motor Assy (Spindle) (M901) ................................... 16
3.
ELECTRICAL ADJUSTMENTS
Test Mode ........................................................................ 17
MD Section ..................................................................... 17
Tuner Section .................................................................. 17
4.
DIAGRAMS ................................................................. 18
4-1. Block Diagram ­ SERVO Section ­ ............................... 23
4-2. Block Diagram ­ TUNER Section ­ .............................. 24
4-3. Block Diagram ­ MAIN Section ­ ................................. 25
4-4. Block Diagram ­ BUS CONTROL/
POWER SUPPLY Section ­ ........................................... 26
4-5. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 27
4-6. Printed Wiring Boards ­ SERVO Section ­ ................... 29
4-7. Schematic Diagram ­ SERVO Section (1/2) ­ ............... 30
4-8. Schematic Diagram ­ SERVO Section (2/2) ­ ............... 31
4-9. Printed Wiring Board ­ MAIN Board ­ ......................... 32
4-10. Schematic Diagram ­ MAIN Board (1/3) ­ ................... 33
4-11. Schematic Diagram ­ MAIN Board (2/3) ­ ................... 34
4-12. Schematic Diagram ­ MAIN Board (3/3) ­ ................... 35
4-13. Printed Wiring Board ­ SUB Board ­ ............................ 36
4-14. Schematic Diagram ­ SUB Board ­ ............................... 37
4-15. Printed Wiring Board ­ KEY Board ­ ............................ 38
4-16. Schematic Diagram ­ KEY Board ­ .............................. 39
4-17. IC Pin Function Description ........................................... 41
5.
EXPLODED VIEWS
5-1. General Section ............................................................... 49
5-2. Front Panel Section ......................................................... 50
5-3. Mechanism Deck Section-1 (MG-164MA-138) ............ 51
5-4. Mechanism Deck Section-2 (MG-164MA-138) ............ 52
6.
ELECTRICAL PARTS LIST ............................... 53
TABLE OF CONTENTS


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3
MDX-CA680/CA680X
SECTION 1
GENERAL
This section is extracted from
instruction manual.
Location of controls
Refer to the pages listed for details.
: During Playback
: During radio reception
: During menu mode
a Volume control dial 16
b MBP button 22
c Z (eject) button (located on the front side
of the unit, behind the front panel) 9
d SOURCE (Power on/Radio/CD/MD)
button 8, 9, 11, 13, 14, 16
e Display window
f Receptor for the card remote
commander
g MENU button 8, 10, 11, 12, 13, 17, 18,
21
h DISPLAY/PTY*1 (display mode change/
programme type) button 9, 11, 15, 18
i SCROLL button 9
j OPEN button 7, 9
k LIST button
11
14
l D-BASS button 22
m RESET button (located on the front side of
the unit, behind the front panel) 7
n Number buttons
(3) REP 10
(6) SHUF 10
13, 14, 16, 17
o MODE button
9, 11
13, 14, 16
p SOUND button 20, 22
q AF button*1 15, 17
r TA button *1 16, 17
s OFF (Stop/Power off) button*2 7, 9
t ENTER button
11
14, 18
8, 10, 11, 12, 13, 17, 18, 21
*2 W
*1 AEP, UK models only
arning when installing in a car without
an ACC (accessory) position on the
ignition switch
After turning off the ignition, be sure to press
(OFF) on the unit for 2 seconds to turn off the
clock display.
Otherwise, the clock display does not turn off
and this causes battery drain.
CD/MD
RADIO
MENU
(AEP, UK models)
1
2
3
4
5
6
AF
TA
OFF
D
S
MENU
LIST
SOUND
ENTER
MBP
SOURCE
REP
SHUF
MODE
D­BASS
DIS
C/PRESET
SEEK
SEEK
DISPLAY
OPEN
PTY
SCROLL
CD/MD
RADIO
CD/MD
RADIO
CD/MD
RADIO
CD/MD
RADIO
MENU


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MDX-CA680/CA680X
u DISC/PRESET buttons (+/­)
9, 11
13, 14, 18
8, 10, 11, 12, 13, 17, 18, 21
v SEEK buttons (­/+)
9
13, 14, 16
8, 10, 12, 18, 20, 21
AF
TA
OFF
D
S
MENU
LIST
SOUND
ENTER
DIS
C/PRESET
SEEK
SEEK
DISPLAY
OPEN
SCROLL
PTY
(SEEK)
(­):to select
leftwards/.
(SEEK)
(+):to select
rightwards/>
(DISC/PRESET)
(+): to select upwards
In menu mode, the currently selectable button (s)
of these four are indicated with a " M" in the display.
(DISC/PRESET)
(­): to select downwards
CD/MD
RADIO
MENU
CD/MD
RADIO
MENU
Setting the clock
The clock uses a 12-hour (US model) or 24-hour
(AEP, UK models) digital indication.
Example: To set the clock to 10:08
1 Press (MENU), then press either side
of (DISC/PRESET) repeatedly until
"CLOCK" appears.
1
Press (ENTER).
The hour indication flashes.
2
Press either side of (DISC/PRESET)
to set the hour.
3
Press the (+) side of (SEEK).
The minute indication flashes.
4
Press either side of (DISC/PRESET)
to set the minute.
2 Press (ENTER).
The clock starts. After the clock setting is
completed, the display returns to normal play
mode.
Tips
· You can set the clock automatically with the RDS
feature (page 18).
· When D.INFO mode is set to ON, the time is always
displayed (page 21).


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5
MDX-CA680/CA680X
TV tuner unit*
Syntoniseur de télévision*
BUS CONTROL IN
BUS AUDIO IN
Source selector*
Sélecteur de source*
* not supplied
non fournis
Cautions
(US model)
· This unit is designed for negative ground 12 V
DC operation only.
· Do not get the wires under a screw, or caught
in moving parts (e.g. seat railing).
· Before making connections, disconnect the
ground terminal of the car battery to avoid
short circuits.
· Connect the yellow and red power input leads
only after all other leads have been connected.
· Run all ground wires to a common ground
point.
· Be sure to insulate any loose unconnected
wires with electrical tape for safety.
· The use of optical instruments with this
product will increase eye hazard.
Notes on the power supply cord (yellow)
· When connecting this unit in combination with
other stereo components, the connected car
circuit's rating must be higher than the sum of
each component's fuse.
· When no car circuits are rated high enough,
connect the unit directly to the battery.
Parts Iist (1)
The numbers in the list are keyed to those in the
instructions.
Caution
Handle the bracket 1 carefully to avoid injuring
your fingers.
Connection example (2)
Notes (2-A)
· Be sure to connect the ground cord before
connecting the amplifier.
· If you connect an optional power amplifier and do
not use the built-in amplifier, the beep sound will
be deactivated.
Tip (2-B-
)
For connecting two or more changers, the source
selector XA-C30 (optional) is necessary.
Connection diagram (3)
1 To a metal surface of the car
First connect the black ground lead, then
connect the yellow and red power input leads.
2 To the power antenna control lead or power
supply lead of antenna booster amplifier
Notes
· It is not necessary to connect this lead if there
is no power antenna or antenna booster, or
with a manually-operated telescopic antenna.
· When your car has a built-in FM/AM antenna in
the rear/side glass, see "Notes on the control
and power supply leads."
3 To AMP REMOTE IN of an optional power
amplifier
This connection is only for amplifiers. Connecting
any other system may damage the unit.
4 To the interface cable of a car telephone
5 To the +12 V power terminal which is energized
in the accessory position of the ignition key
switch
Notes
· If there is no accessory position, connect to the
+12 V power (battery) terminal which is
energised at all times.
Be sure to connect the black ground lead to it
first.
· When your car has a built-in FM/AM antenna in
the rear/side glass, see "Notes on the control
and power supply leads."
6 To the +12 V power terminal which is energised
at all times
Be sure to connect the black ground lead to it
first.
2 A
B
AUDIO OUT FRONT
AUDIO OUT REAR
BUS AUDIO IN
BUS CONTROL IN