Sony MDX-C8970 Service manual
MDX-C8970
SERVICE MANUAL
SPECIFICATIONS
US Model
Model Name Using Similar Mechanism MDX-C7970
Base Mechanism Type MG-164NF-138
Optical Pick-Up Name KMS-241B/J1NP
MICROFILM
FM/AM MINIDISC PLAYER
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic 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-241B/J1NP)
The laser diode in the optical pick-up block may suffer electrostatic break-down easily. When handling it, perform soldering
bridge to the laser-tap on the flexible board. Also perform m easures
against electrostatic break-down suff iciently before the operation.
The flexible board is easily damaged and should be handled with
care.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED
LINE WITH MARK ! ON THE SCHEMA TIC 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.
laser-tap
OPTICAL PICK-UP FLEXIBLE BOARD
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be damaged by heat.
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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation exposure.
2
TABLE OF CONTENTS
1. GENERAL
Location of controls ........................................................ 4
Resetting the unit ............................................................ 4
Detaching the front panel................................................ 4
Preparing the rotary commander .................................... 4
Setting the clock.............................................................. 4
Installation....................................................................... 5
Connections..................................................................... 7
2. DISASSEMBLY ......................................................... 9
3. ELECTRICAL ADJUSTMENTS
Test Mode........................................................................ 15
MD Section ..................................................................... 15
Tuner Section .................................................................. 15
4. DIAGRAMS
4-1. Block Diagram – SERVO Section – ............................... 19
4-2. Block Diagram – TUNER Section – .............................. 20
4-3. Block Diagram – MAIN Section – ................................. 21
4-4. Block Diagram
– DISPLAY/KEY CONTROL Section –........................ 22
4-5. Block Diagram
– BUS CONTROL/POWER SUPPLY Section – ........... 23
4-6. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 24
4-7. Printed Wiring Board – SERVO/SENSOR Boards – ..... 25
4-8. Schematic Diagram
– SERVO (1/2)/SENSOR Boards – ............................... 26
4-9. Schematic Diagram – SERVO Board (2/2) – ................. 27
4-10. Printed Wiring Board
– MAIN Board (Component Side) – .............................. 28
4-11. Printed Wiring Board
– MAIN Board (Conductor Side) – ................................ 29
4-12. Schematic Diagram – MAIN Board (1/5) – ................... 30
4-13. Schematic Diagram – MAIN Board (2/5) – ................... 31
4-14. Schematic Diagram – MAIN Board (3/5) – ................... 32
4-15. Schematic Diagram – MAIN Board (4/5) – ................... 33
4-16. Schematic Diagram – MAIN Board (5/5) – ................... 34
4-17. Printed Wiring Board – POWER Board – ...................... 36
4-18. Schematic Diagram – POWER Board – ......................... 37
4-19. Printed Wiring Board – DISPLAY Board – ................... 38
4-20. Schematic Diagram – DISPLAY Board – ...................... 39
4-21. Printed Wiring Board – RELAY Board – ....................... 40
4-22. Schematic Diagram – RELAY Board –.......................... 41
4-23. IC Pin Function Description ........................................... 49
5. EXPLODED VIEWS ................................................ 63
6. ELECTRICAL PARTS LIST ............................... 67
3
SECTION 1
GENERAL
This section is extracted from
instruction manual.
4
567
8
SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
SUB PANEL ASS’Y
2
two claws
4
sub panel ass’y
1
three screws
(PTT2.6
×
6)
2
claw
MECHANISM DECK (MG-164NF-138)
3
connector
(CN701)
1
screw
(PTT2.6
1
two screws
(PTT2.6
×
6)
×
4)
2
mechanism deck
(MG-164NF-138)
3
flexible board
(CN202)
9
SERVO BOARD
2
sensor flexible board
(CN102)
3
two screws
(BVTT2
1
flexible board
3
two screws
(BVTT2
4
1
(CN101)
×
4 )
servo board
flexible board
(CN103)
×
4)
MAIN BOARD
6
Remove the solder of the cord
(with connector) (ANT).
3
three ground point screws
5
4
main board
insulating sheet
1
two connectors
(CN101, 291)
9
cord (with connector)
(RCA)
7
two screws
(PTT2.6
8
cord (with connector)
(ANT)
×
10)
0
seven screws
(PTT2.6
!¡
Remove the heat sink
in the direction of the arrow.
×
10)
2
two screws
(PTT2.6
×
10)
10
MD COVER ASS’Y
s
1
spring (float B)
1
spring (float B)
2
two springs (float F)
3
Pushing the arrow A part,
raise the float block upward at the front to unlock.
A
float block
lever (lock R)
lever (lock L)
3
MD cover ass’y
cassette holder
shaft (MD cover guide)
1
four screw
(B2 × 3)
FLOAT BLOCK
A
2
Pushing the cassette holder in the arrow A direction with a screwdriver,
disengage the shaft (MD cover guide) from the groove of MD cover ass’y.
Note : Be careful not to damage the optical pick-up
when pushing the cassette holder with a screwdriver.
11
LO MOTOR ASS’Y (LOADING) (M903)
)
4
Remove the bracket (LO)
in the direction of the arrow
A
.
1
Remove solder of the motor (M903).
A
5
LO motor ass’y (loading) (M903
2
spring (rack)
3
claw
LEVER ASS’Y (LE)
2
stopper washer
1
3
4
roller (gear E)
lever ass’y (LE)
12
HOLDER ASS’Y
1
spring (CHKG)
2
stop ring E (1.5)
3
lever (lock R)
2
stop ring E (1.5)
4
Remove the holder ass’y
in the direction of the arrow.
3
lever (lock L)
2
stop ring E (1.5)
2
stop ring E (1.5)
1
spring (CHKG)
CHUCKING ARM ASS’Y
holder ass’y
1
Remove the chucking arm ass’y
in the direction of the arrow.
13
OPTICAL PICK-UP (KMS-241B/J1NP)
y
7
optical pick-up
(KMS-241B/J1NP)
1
two screws
(K2
×
3)
2
shaft (OPTL)
4
screw
(B2
×
3)
6
bearing (SL)
5
feed screw ass’
3
screw
(K2
×
3)
SL MOTOR ASS’Y (SLED) (M902)/SP MOTOR ASS’Y (SPINDLE) (M901)
4
screw
(P1.7
×
1.8)
bracket (SL)
3)
0
!¡
SP motor ass’y
(spindle) (M901)
9
bracket (SP)
two screws
×
1.8)
(P1.7
7
screw
(B2
8
5
6
base (SL)
SL motor ass’y
(sled) (M902)
×
2
two screws
(PSW2
×
8)
3
sensor board
14
1
Remove solders
of motors (M901, 902).
SECTION 3
)
ELECTRICAL ADJUSTMENTS
TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and AM Auto Scan/Stop Level adjustments can
be performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Turn ON the regulated power supply. (All LEDs on the set
lights up, and the clock is displayed.)
Note: Press the [OFF] button, if the clock is not displayed.
2. Push the preset [4] button.
3. Push the preset [5] button.
4. Press the preset [1] button for more than two seconds.
5. Then the display indicates all lights, the test mode is set.
<Release the Test mode>
1. Push the [OFF] button.
See the adjustment location from on page 17 for the adjustment.
MD SECTION
MD section adjustments are done automatically in this set.
TUNER SECTION
0 dB=1 µV
Cautions during repair
When the tuner unit is defective, replace it by a new one because its internal block is difficult to repair.
Note: Adjust the tuner section in the sequence shown below.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment (Wide)
3. FM Stereo Separation Adjustment (Narrow)
4. AM Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
[SOURCE] button : FM
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level : 22 dB (12.6
Mode : mono
Modulation : 1 kHz, 22.5 kHz deviation (30%
Procedure:
1. Set to the test mode.
2. Push the
[SOURCE] button and set to FM.
antenna jack (CN101)
0.01 µF
µ
V)
set
Display
SHUF
3. Adjust the v olume RV2 on TU101 by turning clockwise untill
“0” is shown next to “FM” on the display window, If “0” is
already shown or the volume RV2 has been turned too far,
turn it back counterclockwise untill “0” is disappeared once,
then try this adjustment.
Display
SHUF
Adjustment Location: See page 17.
15
FM Stereo Separation Adjustment (Wide)
Setting:
[SOURCE] button : FM
FM Stereo Separation Adjustment (Narrow)
Setting:
[SOURCE] button : FM
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main: 1 kHz, 33.75 kHz deviation (45%)
antenna jack (CN101)
0.01 µF
(75
Ω)
sub : 1 kHz, 33.75 kHz deviation (45%)
: 19 kHz pilot: 7.5 kHz deviation (10%)
set
10 k
LINE OUT jack (CNP601)
Ω
level meter
+
–
Procedure:
1. Adjust the v olume RV3 on FM/AM tuner unit (TU101) for the
best separation.
FM Stereo
signal generator
output channel
L-CH L-CH A
L-CH R-CH Adjust RV3 on TU101
R-CH R-CH C
R-CH L-CH D
Level meter Level meter
connection reading (dB)
B
for minimum reading.
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Specification: Separation more than 24 dB
Adjustment Location: See page 17.
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main: 1 kHz, 20 kHz deviation (26.5%)
antenna jack (CN101)
0.01 µF
(75
Ω)
sub : 1 kHz, 20 kHz deviation (26.5%)
: 19 kHz pilot: 7.5 kHz deviation (10%)
set
10 k
LINE OUT jack (CNP601)
Ω
level meter
+
–
Procedure:
1. Push the
[SHIFT] button.
2. Push the [4] button four times.
3. Push the [5] button twice and set to narrow mode.
4. Adjust the v olume RV4 on FM/AM tuner unit (TU101) for the
best separation.
FM Stereo
signal generator
output channel
L-CH L-CH A
L-CH R-CH Adjust RV4 on TU101
R-CH R-CH C
R-CH L-CH D
Level meter Level meter
connection reading (dB)
B
for minimum reading.
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Specification: Separation more than 18 dB
Adjustment Location: See page 17.
16
AM Auto Scan/Stop Level Adjustment
µ
TU101
RV1
AM Auto Scan/Stop
Level Adjustment
RV2
FM Auto Scan/Stop
Level Adjustment
RV3
FM Stereo Separation
Adjustment (Wide)
RV4
FM Stereo Separation
Adjustment (Narrow)
Front
Setting:
[SOURCE] n [MODE] button : AM
AM RF signal
generator
AM dummy antenna
(50 Ω)
30
Ω
Adjustment Location:
15 pF
65 pF
set
Carrier frequency : 999 kHz
30% amplitude
modulation by
1 kHz signal
Output level : 33 dB (44.7
antenna jack (CN101)
V)
Procedure:
1. Set to the test mode. (See page 15.)
2. Push the
3. Push the
[SOURCE] button and set to FM.
[MODE] button and set to AM.
Display
SHUF
TP
4. Adjust the v olume RV1 on TU101 by turning clockwise untill
“0” is shown next to “MW” on the display window, If “0” is
already shown or the volume RV1 has been turned too far,
turn it back counterclockwise untill “0” is disappeared once,
then try this adjustment.
Display
SHUF
TP
Adjustment Location: See page 17.
17
18
SECTION 4
DIAGRAMS
MDX-C8970
4-1. BLOCK DIAGRAM – SERVO Section –
I
J
F
C B
I J
D A
E
DETECTOR
LASER DIODE
OPTICAL PICK-UP
(KMS-241B/J2N)
2-AXIS
DEVICE
(FOCUS)
(TRACKING)
05
LDPD
ILCC
PD
M901
(SPINDLE)
M902
(SLED)
FCS+
FCS–
TRK+
TRK–
B
A
C
D
E
F
AUTOMATIC
POWER
CONTROL
Q302
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
6
27
25
21
23
12
10
8
OUT4F
OUT4R
OUT2F
OUT2R
OUT1F
OUT1R
OUT3F
OUT3R
M
M
IC303
I
1
J
2
A
4
B
5
C
6
D
7
E
8
F
9
APC
11
PD
10
IN4R
IN4F
IN2F
IN2R
IN1F
IN1R
IN3F
IN3R
RF AMP
I-V
AMP
I-V
AMP
16PSB
3
4
29
30
19
18
14
15
48 47
MORFO
LD/PD
AMP
SPFD
SPRD
MORFI
RFO
B.P.F.
3T
AT
AMP
APCREF
12
LEVEL SHIFT
46
IC306
WBL
B.P.F.
ABCD
AMP
WBL3TEQ
V-I
CONVERTER
F0CNT
20
APCREF
83
SFDR
92
SRDR
91
FFDR
88
FRDR
89
TFDR
86
TRDR
85
FOCUS/TRACKING ERROR AMP
AGCI
40
TEMP
ADFM
29 30
FOCUS
ERROR AMP
TRACKING
ERROR AMP
+3.3V
AUTOMATIC
CONTROL
DIGITAL
SIGNAL
PROCESS
PWM GENERATOR
RF AMP,
IC302
RF AGC
& EQ
EQ
WBL
PEAK &
BOTTOM
ADIN
COMMAND
SERIAL/
PARALLEL
CONVERTER,
DECODER
XLAT
SCLK
SWDT
1716 18
PEAK HOLD
Q301
+3.3V
13
RECP
POWER
SERVO
DIGITAL SERVO
SIGNAL PROCESSOR
IC301 (2/2)
RF
AUX
PEAK
BOTM
ADFG
ABCD
FE
TE
SE
ABCD
AUX1
38
33
37
36
32
35
34
26
28
7465647566 63
FE
TE
AUX2
ABCD
ANALOG MUX
A/D CONVERTER
FROM CPU
INTERFACE
AUTO
SEQUENCER
FILTER
73 62
SE
PEAK
XLRF
CKRF
DTRF
100
59
58
61
60
51
52
55
78
79
BOTM
EFMO
FILI
PCO
CLTV
FILO
ASYO
ASYI
COMPA-
RFI
RATOR
ADIP
ADFG
DEMODULATOR/
DECODER
F0CNT
80
81
82
PLL
15
TX
EFM/ACIRC
ENCODER/DECODER
SUBCODE
PROCESSOR
SPINDLE
SERVO
SPFD
SPRD
DQSY11SQSY14XINT
XRST
94 93
10
12
59 62 55 54 52 45 51 64 26 27 28 29
MD-RST
7 6
LOADING
MOTOR DRIVE
IC305
M903
(LOADING)
5
RIN FIN
OUT1 OUT2
1 7
SHOCK PROOF
MEMORY CONTROLLER
51331
LEVEL SHIFT
IC502
61242
SQSY
CC-XINT
EJECT
LOAD
4
M
ATRAC
CPU
INTERFACE
SENS
SRDT
SWDT
9 8 5 6 7
SWDT
SENS
MD-SI
MD-SO
ON: When the disc loading start
and the disc eject completion.
IC301 (1/2)
SAMPLING
RATE
CONVERTER
DIGITAL
AUDIO
ENCODER/DECODER
INTERFACE
D-RAM
INTERNAL BUS
MONITOR
CONTROL
SCLK
XLAT
MNT0
MNT1
MNT2
1 2 3 4
135
13
LEVEL SHIFT
IC503
246
12
FOK
SHOCK
XBUSY
SCLK
XLAT
MNT0
MD-LAT
MD-CKO
LOADING START/
EJECT END
MNT1
MD MECHANISM CONTROLLER
IC501 (1/2)
C-SW
63
ADDT
23
DIGITAL SIGNAL PROCESSOR,
EFM/ACIRC ENCODER/DECODER,
SHOCK PROOF MEMORY CONTROLLER,
ATRAC ENCODER/DECODER, 2M BIT D-RAM
DIN
21
DOUT
22
DADT
24
MNT3
SLOCK
MNT2
MNT3
LOADING
END
ON: When completion of
the disc loading.
IC301 (1/2)
BCK
LRCK
2526 27
XBCK
LRCK
FS256
CLOCK
GENERATOR
TH501
39
TEMP
E-SW
11 56
DADT, BCK, LRCK, 512FS
LOCK
LIMIT-IN
512FS
BUFFER
IC304
OSCI
16
OSCO
17
D0 – D3A00 – A09
47, 46, 48, 49
32 – 29, 34 – 38, 43
XOE
41 22
XWE
45 3
XRAS
44 4
XCAS
42 23
EMPHASIS
66
21
DEEMP
(LIMIT)
ON: When the optical pick-up is
inner position.
• SIGNAL PATH
: MD PLAY
512FS
D0 – D3
1, 2, 24, 25
A0 – A9
9 – 12, 14 – 18, 5
OE
WE
RAS
CAS
D-RAM
IC307
EMPHASIS
LOCK
31
EXTAL
XTAL
32
(Page 21)
(Page 21)
(Page 22)
X501
10MHz
A
B
C
1919
MDX-C8970
4-2. BLOCK DIAGRAM – TUNER Section –
FM/AM TUNER UNIT
2
1
TU101
FM-ANT
AM-ANT
LO/DX
4
VCO11AM-IF
FM-IF
6
21
VT
5
13
CN101
ANT
SEEK
20SD22
ST/MONO
FORCED
24
8
FM +B
10
AM +B
9
+B (FM/AM)
FM B+
AM B+
TUNER B+
S-METER
19
FM LCH
FM RCH
AM DET
AM/TIR
FM
(Page 21)
(Page 21)
D
E
18
16
R-CH
12
MUTING
Q752
MUTING
Q753
MUTING
IC752
6 5
3
AUDIO +8.5V
• SIGNAL PATH
: FM
: AM
5 24 14
LO/DX
OSCI
X151
10.25MHz
25
FM IN
OSCO
15
IF FM
AM IN
FM/AM PLL
IC151
IF AM
28
LP OUT
169 10 13 12
120
FILTER
1
LP FM
SSTOP
70 71
SSTOP
2
3
LP HC
LP AM
SDA
SCL
I2C-SCL
I2C-DATA
117
23
SEEK
29
SD-IN
WIDE/NARROW
ST/MONO
SWITCH
Q132
32
NARROW
WIDE/NARROW
SWITCH
Q131
FM/AM SIGNAL
METER BUFFER
Q133
46
31
VSM
WIDE
(S-METER)
MASTER CONTROLLER
IC500 (1/4)
R-CH
D751
MUTING
CONTROL SWITCH
Q751
118
AF-MUTE
05
2020
MDX-C8970
4-3. BLOCK DIAGRAM – MAIN Section –
LEVEL SHIFT
IC351 (1/2)
DADT
9
LRCK
2
A
(Page 19)
D
(Page 20)
E
(Page 20)
CNP601 (1/2)
BUS
AUDIO IN
CNJ252
MIC
DADT,
BCK,
LRCK,
512FS
FM
AM/TIR
L
R
FLASH
MEMORY
IC805
RESET
MIC AMP
IC841 (1/3)
OE
CE
WE
D0 – D7
A-1
A0 – A18
28
26
11
45
12
R-CH
R-CH
38, 40, 42, 44
29, 31, 33, 35,
48, 17, 16
25 – 18, 8 – 1,
FM-IN-L
AM-IN-L
AUX-IN-L
D0 – D7 D0 – D7
A0
A1 – A19
BCK
512FS
INPUT SELECT
IC771
20
18
16
8 9
SEL0
BUFFER
IC841 (2/3)
BUFFER
IC841 (3/3)
5
14
INPUT
SELECTOR
SEL1
REFERENCE VOLTAGE
GENERATOR (FOR BIAS)
ADDRESS BUS
8
10
3
1
6
4
XMST
IC843 (2/2)
DATA BUS
R-CH
12
LEVEL SHIFT
IC351 (2/2)
DSPSTP
A0 – A19
SI1
71
76
LRCK
75
BCK
81
PLCLK
35
LIN
46
RIN
77
XMST
11
82
CKSTP
+5V
51
AN0
50
AN1
P07
32
33
P06
27
FCE
45
WRD
64 – 57
D0 – D7
A0 – A19
18 – 11, 8 – 1, 31-28
DIGITAL SIGNAL PROCESSOR,
DIGITAL FILTER,
D/A CONVERTER
IC300
XLAT
RVDT59SCK
RVDT
62 57
XLAT
SCK
48
20
19
REDY
6061
REDY
DSPRST
14.318MHz
(Page 22)
(Page 19)
CSV
IC801
TRDT
63
TRDT
DAC
XI1
XO1
AOUTL1
AOUTR1
AOUTR3
AOUTL3
AOUTR2
XTLI38
XTLO38
XRST
BUFFER
IC843 (1/2)
X801
DSPCK,
SA DATA
F
EMPHASIS
B
27
29
54
52
43
41
40
FL-OUT
RL-OUT
FR-OUT
RR-OUT
SUB-OUT
16.9344MHz
SEL0
SEL1
XMST
DSPSTP
TRDT
RVDT
SCK
XLAT
REDY
DSPRST
SA DATA
DSPCK
R-CH
R-CH
X300
CSV MIX SWITCH
IC691
1 2
R-CH
Q691
7
AUDIO +8.5V
CSV-PLAY
11
AUDIO SEL0
37
40
AUDIO SEL1
DSP-XMST
30
9
DSPSTP
17
DSP-SI
DSP-SO
18
19
DSPCK
DSP-XLAT
59
79
DSP-REDY
28
DSP-RST
81
EMPH
MASTER CONTROLLER
CENTER VOLTAGE
GENERATOR
IC500 (2/4)
LOW-PASS
FILTER
IC601
LOW-PASS
FILTER
IC661 (1/2)
(FOR BIAS)
IC661 (2/2)
VOL-DATA-L
VOL-DATA-R
VOL-CLK
VOL-LOAD
MUTE
ELECTRICAL
VOLUME
IC602
IN1
IN2
GND 1-3
5, 1, 17
RESISTIVE
NETWORK &
TAP SWITCHES
SHIFT
REGISTER &
LATCH
D-IN
11 9 10
DAT-L
IN1
4
IN2
2
IN3
18
GND 1-3
5, 1, 17
CONTROL SWITCH
4
2
R-CH
R-CH
R-CH
DAT-L
56
DAT-R
57
58
55
36
CLK
LOD
D527
L/S
CLK
CLK
LOD
NETWORK &
TAP SWITCHES
REGISTER &
MUTING
Q473
OUT1
OUT2
ELECTRICAL
VOLUME
IC632
RESISTIVE
SHIFT
LATCH
L/S
D-IN
CLK
11 9 10
CLK
LOD
DAT-R
6
20
OUT1
OUT2
OUT3
6
20
16
D491
BUFFER
IC603
R-CH
R-CH
R-CH
: MD PLAY : FM : AM
LINE
DRIVER
IC604
R-CH
R-CH
BUFFER
IC663
R-CH
12
14
11
15
POWER AMP
IC481
IN2
IN4
IN1
IN3
MUTING
Q601
MUTING
Q602
MUTING
Q631
MUTING
Q632
MUTING
Q661
MUTING
Q662
OUT2+
OUT2–
OUT4+
OUT4–
OUT1+
OUT1–
OUT3+
OUT3–
CNP601 (2/2)
L
FRONT
LINE OUT
R
L
REAR
LINE OUT
R
(L)
(R)
CN291
SUB OUT
CNP401 (1/2)
(POWER CONNECTOR)
5
3
21
23
9
7
17
19
1
FL+
9
FL–
4
FR+
12
FR–
2
RL+
10
RL–
3
RR+
11
RR–
• SIGNAL PATH
21
RST
38
DO
DI
D0 – D7
D0 – D7
21 – 23, 25 – 29
PROGRAM
ROM
IC803
A0 – A15
20 – 13, 3, 2, 31
A16
10
A17
6
A18
7
32
OE
05
1, 12, 4, 5, 11
A0 – A15
6
11
8
3
SWITCHING
IC802
1
2
DATA BUS
SWITCHING
IC804
RDC44RDD
42
26
ADDRESS BUS
A16
4
5
A17
12
13
A18
9
10
2
1
4
CLK
REQ
ROMCONT
36
39
35
37
CE
112
25
26
27
110
111
CSV-RST
CSV-SI
CSV-SO
CSV-CK
CSV-REQ
CSV-CE
POWON
AMP-STBY
TEST
TEL-MUTE
BATTERY OFF
MUTE DRIVER
Q472
MUTING
CONTROL SWITCH
Q471
62
RESET SWITCH ON
MUTING DRIVER
Q501
98
80
83
D471
D472
MUTING
CONTROL SWITCH
Q474
AUDIO +8.5V
BATT B+
LEVEL SHIFT
Q451
22
MUTE
4
STBY
TEST MODE
TEL-ATT
POW-ON
RESET
TEL 5V
15
13
G
(Page 23)
H
(Page 23)
I
(Page 22)
2121
MDX-C8970
4-4. BLOCK DIAGRAM – DISPLAY/KEY CONTROL Section –
(Page 21)
(Page 19)
DSPCK, SA DATA
F
LOCK
C
CNJ272
REMOTE IN
48
D282
49 60
RC-IN0
DSPCK
63
RC-IN1
78
SA DATA
33
61
LSW702, 900 – 906,
SP-LAT
LSW909 – 918,
S900
47
48
KEY-IN1
KEY-IN0
X701
18.432MHz
86
DOOR-IND
X0A
74
TEL 5V
I
BATT B+
LCD +10V
(Page 21)
ROTARY
ENCODER
RE900
D254
1 2
RE-IN1
RE-IN0
85
RE900
VOLUME/BASS/
TREBLE/BALANCE/
FADER CONTROL
DOOR-SW
115
CN702
MAIN BODY SIDE
54
76
KEYACK
CN800
FRONT PANEL SIDE
9 10
KEY ACTIVE
SWITCH
Q523
107
AD-ON
MASTER CONTROLLER
IC500 (3/4)
41
BACKUP +5V
LCDANG
(NOSE DETECT)
109
NOSE-SW
S500
BUZZER
DRIVE
Q504
15
BEEP
BZ500
(BUZZER)
LED706
(MD DISC SLOT),
LSW702
P-ON +10V
§
P-ON +10V
SWITCH
Q904
X1
93
X500
3.68MHz
LED DRIVE
Q251
95
X0
92
X1A
73
X501
32.768kHz
SP-SI
SP-LAT
SP-SCK
MD-LOCK
LCD CE1
70
R924
OSC
13
OSCOUT
05
12
OSCIN
LIQUID CRYSTAL
DISPLAY DRIVER
SEG66 – SEG121
25 – 80
9
IC920
CE1
8
7
DATA
CLK
10
OE
VLC0 – VLC3
COM0 – COM3
LIQUID CRYSTAL DISPLAY
16 – 19
21 – 24
LIQUID CRYSTAL DISPLAY
DRIVE CONTROLLER
EXTAL
IC701 (1/2)
LCD900
XTAL
LCD DATA
LCD SCK
60
64 66
18
17
14
LCD-CLK
LCD-DATA
SEG1 – SEG65
26 – 90
LCDINH
LCD CE0
69
19
LCD-CE
LCD-INH
DOOR-SW
BUFFER
IC921
COM0 – COM7
VLC0 – VLC5
100 – 93
11 – 6
CONTRAST
SWITCHING
Q254, 255
LCD +10V
21
OSC-OUT
LED900 – 907,
LSW901, 902
LED DRIVE
Q900
R952
OSC
OSC-IN
1
GREEN
IC900
20
LIQUID CRYSTAL DISPLAY DRIVER
Q903
LED DRIVE
Q901
2
AMBER
Q902
LSW900,
LSW903 – 906,
LSW909 – 918
3
P-ON
LED971 – 976
(LCD BACK LIGHT)
LED B+
REGULATOR
Q971, 972
4
DIMMER
LCD +10V
2222
4-5. BLOCK DIAGRAM – BUS CONTROL/POWER SUPPLY Section –
MDX-C8970
(Page 21)
SIRCS
RESET
DATA
CLK
BUS ON
BATT
CN271
BUS CONTROL IN
(FOR SONY BUS)
(Page 21)
H
3
2
5
4
6
7
BATT B+
G
POW-ON
RESET
BACKUP +5V
BUS ON SWITCH
Q272
TH271
RESET SIGNAL
GENERATOR
BUS-ON
IC506
2
6
4
1
3
D276
D275
S703
RESET
SONY BUS INTERFACE
IC271
RST
RESET
SWITCH
DATA
DATA OUT
CLK
BUS ON
OUT
BUS ON
SWITCH
BATT
BATTERY
SWITCH
BATTERY
DETECT
Q271
LEVEL SHIFT
Q274
LEVEL SHIFT
Q273
RST
DATA IN
CLK IN
BUS
ON IN
BU IN
REMOTE CONTROL
RECEIVER
IC910
13
9
8
11
12
10
BACKUP +5V
RAM RESET
IC507
SIRCS
BUFFER
Q275
D204
LEVEL SHIFT
IC702
MASTER CONTROLLER
IC500 (4/4)
35
RAMBU
SIRCS
24
RESET
90
86
HSTX
6
SYSRST
UNISO
21
20
UNISI
22
UNICKO
7
BUS-ON
BU-IN
77
LIQUID CRYSTAL DISPLAY
DRIVE CONTROLLER
82
NMI (H)
49
BU-IN
BUS-ON
38
81
RESET
101
UNICKI
UNISI
98
UNISO
97
MD MECHANISM CONTROLLER
60
BU-IN
BUS-ON
61
30
RESET
48
UNICKIO
49
UNISI
UNISO
50
46
LINKOFF
CSV ON 16
DSP ON
SHIFT OUT 72
PWM IN 65
ACC IN
ILL IN
FM-ON
TU-ON
IC701 (2/2)
IC501 (2/2)
MDMON
96
61
85
114
84
52ILL-ON
65MD-ON
10
(DSP CIRCUIT B+)
OSC SWITCH
(TUNER CIRCUIT B+)
(TUNER CIRCUIT B+)
ACC IN
ILL IN
DIG +3.3V
ANA +3.3V
DSP +5V
Q890
LOAD +12V
LOADING MOTOR
DRIVER (IC305) B+
DRIVER +5V
MOTOR/COIL DRIVER
(IC303) B+
TU +8V
TU +5V
FM +8V
(FM CIRCUIT B+)
AM +8V
(AM CIRCUIT B+)
3
14
2
+3.3V
PULL UP +5V
BACKUP +5V
+5V
(CSV CIRCUIT B+)
+3.3V REGULATOR
IC404
+3.3V REGULATOR
IC401, Q401
IN1
ERROR
AMP
IN2
ERROR
AMP
RT
FM-ON
OSC
REGULATOR
IC401, Q401
B+ SWITCH
Q183
COMPARATOR
COMPARATOR
+3.3V
VCC
Q182
B+ SWITCH
Q801, 802
B+ SWITCH
Q402, 403
PWN
PWN
POWER CONTROL
IC871
B+ SWITCH
+5V
REGULATOR
Q185
B+ SWITCH
Q180
Q181
OUTPUT
CIRCUIT
OUTPUT
CIRCUIT
Q402, 403
OUT1
OUT2
VCC
7
10
9
B+ SWITCH
Q886,887
+8V
REGULATOR
IC403
TU-ON
D424
D422
D403
AUDIO +8.5V
(AUDIO CIRCUIT B+)
+5V
(MIC AMP CIRCUIT B+)
LCD +10V
LCD DRIVER (IC900, 920)/
ILLUMINATION LED B+
ACCESSORY CHECK
CONTROL SWITCH
Q441
BATT B+
POWER AMP
(IC481) B+
B+ CHECK
IC421
SWITCHING
REGULATOR
Q884
POWER
Q882
ANTENNA REMOTE
Q461(2/2), 462(2/2)
+5V
REGULATOR
Q841
B+ SWITCH
Q253, 256
ILL-ON
SWITCH
D442
REGULATOR
Q421, 422
REGULATOR
CONTROL SWITCH
Q423, 424
SWITCHING
REGULATOR
B+ SWITCH
AMP REMOTE
SWITCH
Q461(1/2), 462(1/2)
REGULATOR
ILLUMINATION
LINE DETECT
Q431
+5V
Q883
Q881
+8.5V
IC402
POW-ON
TH461
TH462
POW-ON
TU-ON
BUS-ON
D431
CNP401 (2/2)
(POWER CONNECTOR)
F1
16
BATT
5
AMP REM
6
ANT REM
7
ACC
14
ILL
05
2323
d
4-6. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
(In addition to this, the necessary note is printed in each block)
• Circuit Boards Location
Note on Printed Wiring Boards:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
r
•
•
• b : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.
: Through hole.
¢
: internal component.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1/
specified.
¢
•
• C : panel designation.
Note: The components identified by mark ! or dotted line
• U : B+ Line.
• Power v oltage is dc 14.4V and fed with regulated dc power
• Voltages are tak en with a V OM (Input impedance 10 MΩ).
• Waveforms are taken with a oscilloscope.
• Circled numbers refer to waveforms.
• Signal path.
: internal component.
with mark ! are critical for safety.
Replace only with part number specified.
supply from ACC and BATT cords.
Voltage variations may be noted due to normal produc-
tion tolerances.
Voltage variations may be noted due to normal produc-
tion tolerances.
F : FM
f : AM
E : MD
4
W or less unless otherwise
RELAY board
DISPLAY board
MAIN board
SENSOR board
SERVO board
POWER boar
24
24
4-7. PRINTED WIRING BOARD – SERVO/SENSOR Boards – • See page 24 for Circuit Boards Location.
MDX-C8970
• Semiconductor
Location
Ref. No. Location
D401 E-6
D501 E-5
IC301 B-5
IC302 D-2
IC303 B-3
IC304 C-5
IC305 F-8
IC306 B-4
IC307 B-8
IC401 E-6
IC501 F-3
IC502 D-5
IC503 D-4
Q301 A-4
Q302 C-1
Q401 E-6
Q402 E-8
Q403 E-8
(Page 28)
2525
MDX-C8970
4-8. SCHEMATIC DIAGRAM – SERVO (1/2)/SENSOR Boards – • See page 35 for Waveforms. • See page 42 for IC Block Diagrams.
26
26
The components identified by mark ! or dotted
line with mark ! are critical for safety.
Replace only with part number specified.
Note on Schematic Diagram:
• Voltages and waveforms are dc with respect to
ground in playback mode.
no mark : MD
: Impossible to measure
∗
4-9. SCHEMATIC DIAGRAM – SERVO Board (2/2) – • See page 35 for Waveforms. • See page 44 for IC Block Diagrams.
MDX-C8970
(Page 32)
2727
MDX-C8970
4-10. PRINTED WIRING BOARD – MAIN Board (Component Side) – • See page 24 for Circuit Boards Location.
• Semiconductor Location
Ref. No. Location
D2O4 J-11
D251 K-12
D252 K-12
D253 K-12
D254 K-11
D255 K-13
D256 K-13
D257 K-12
D258 K-12
D259 K-12
D260 K-12
D261 K-13
D262 K-11
D263 K-11
D264 K-11
D265 K-11
D271 D-13
D279 B-14
D280 A-14
D282 A-14
D283 B-13
D291 B-13
D421 E-11
D422 E-12
D423 D-12
D424 D-12
D441 E-9
D442 E-9
D461 C-10
D462 C-10
D463 C-10
D464 C-9
D466 C-9
D471 C-8
D472 D-8
D481 B-7
D482 B-7
D483 B-6
D484 B-6
D485 B-7
D486 B-8
D487 B-8
D488 B-8
D491 B-6
D546 K-3
D601 B-5
D631 B-4
D661 A-1
Ref. No. Location
D701 H-11
IC151 E-3
IC271 C-13
IC300 H-6
IC404 E-10
IC421 E12
IC500 J-6
IC506 H-5
IC507 J-8
IC602 D-7
IC632 D-6
IC691 G-8
IC701 H-12
IC702 J-11
Q131 I-2
Q132 I-2
Q133 G-1
Q180 B-2
Q181 B-2
Q182 C-2
Q183 C-2
Q185 D-3
Q251 J-9
Q253 I-9
Q254 J-10
Q255 J-9
Q256 J-9
Q271 C-13
Q272 C-12
Q275 B-13
Q421 D-11
Q422 D-11
Q423 E-11
Q424 E-11
Q441 F-9
Q451 D-10
Q461 D-9
Q462 E-10
Q471 C-8
Q472 D-8
Q473 C-8
Q474 D-8
Q501 H-5
Q523 J-8
Q691 G-8
Q751 F-2
Q752 G-2
28
(Page 25)
28
4-11. PRINTED WIRING BOARD – MAIN Board (Conductor Side) – • See page 24 for Circuit Boards Location.
MDX-C8970
(Page 36)
(Page 40)
• Semiconductor Location
Ref. No. Location
D181 C-2
D272 B-12
D273 B-12
D274 B-12
D275 C-12
D276 B-12
D277 B-13
D278 B-13
D403 F-13
D431 D-9
D432 D-9
D477 B-13
D489 A-7
D527 I-9
D555 J-7
D702 I-11
D751 F-2
IC351 H-6
IC401 E-9
IC402 E-10
IC403 D-10
IC481 A-7
IC601 F-7
Ref. No. Location
IC603 D-7
IC604 C-6
IC631 F-6
IC633 D-6
IC634 C-4
IC661 E-5
IC663 B-2
IC752 G-2
IC771 F-3
Q273 B-13
Q274 B-13
Q401 F-9
Q402 F-12
Q403 F-10
Q431 D-8
Q504 J-5
Q601 B-5
Q602 B-5
Q631 B-4
Q632 B-4
Q661 B-2
Q662 A-2
Q753 F-2
2929
MDX-C8970
4-12. SCHEMATIC DIAGRAM – MAIN Board (1/5) – • See page 35 for Waveforms. • See page 46 for IC Block Diagrams.
(Page 31)
(Page 34)
(Page 32)
Note on Schematic Diagram:
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
30
(Page 33)
30
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