Sony CDXM-9900 Service manual

CDX-M9900/M9905X

SERVICE MANUAL

Ver 1.0 2004. 02

Photo: CDX-M9900

• The tuner and CD sections have no adjustments.

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS (US Model)

POWER OUTPUT AND TOTAL HARMONIC DISTORTION

23.2 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.

Model Name Using Similar Mechanism CDX-F5500/F5500X/FW570
CD Drive Mechanism Type MG-611MA-186//K
Optical Pick-up Name KSS1000E

US Model

Canadian Model

CDX-M9900/M9905X

AEP Model

UK Model

E Model

CDX-M9900

MW/LW (AEP, UK, E Model)
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

CD player section

Signal-to-noise ratio 120 dB
Frequency response 10 – 20,000 Hz
Wow and flutter Below measurable limit

Tuner section

FM

Tuning range 87.5 – 107.9 MHz (US, Canadian Model)

87.5 – 108.0 MHz (AEP, UK, E Model)
Antenna terminal External antenna connector
Intermediate frequency 10.7 MHz/450 kHz
Usable sensitivity 9 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 67 dB (stereo),

69 dB (mono)

Harmonic distortion at 1 kHz

0.5% (stereo),

0.3% (mono)
Separation 35 dB at 1 kHz
Frequency response 30 – 15,000 Hz

AM (US, Canadian 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 52 W × 4 (at 4 ohms)

General

Outputs Audio outputs (front/rear)

Subwoofer output (mono)

Power antenna relay control terminal

Power amplifier control terminal
Inputs Telephone ATT control terminal

Illumination control terminal

Parking brake input terminal

(US, Canadian, AEP, UK Model)

BUS control input terminal

BUS audio input/AUX IN terminal

Antenna input terminal

Video input terminal

– Continued on next page –

FM/AM COMPACT DISC PLAYER

US, Canadian Model

FM/MW/LW COMPACT DISC PLAYER

AEP, UK, E Model

9-877-633-01

2004B04-1
© 2004. 02

Sony Corporation

e Vehicle Company
Published by Sony Engineering Corporation

1

CDX-M9900/M9905X

Tone controls Bass: ±8 dB at 100 Hz

Treble: ±8 dB at 10 kHz

Loudness +8 dB at 100 Hz

+2 dB at 10 kHz

Power requirements 12 V DC car battery

(negative ground)

Dimensions Approx. 178 × 50 × 187 mm

(7 1/8 × 2 × 7 3/8 in.) (w/h/d)

Mounting dimensions Approx. 182 × 53 × 162 mm

(7 1/4 × 2 1/8 × 6 1/2 in.) (w/h/d)

Mass Approx. 1.6 kg

(3 lb. 8 oz.)

Supplied accessories Card remote commander RM-X145A (1)

(US, Canadian Model)
Card remote commander RM-X144 (1)
(AEP, UK, E Model)
Parts for installation and connections (1 set)
Front panel cover (1)

Note

This unit cannot be connected to a digital preamplifier or an equalizer
which is Sony BUS system compatible.

Design and specifications are subject to change without
notice.

SERVICE NOTES

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.

• US, Canadian model

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.

If the optical pick-up block is defective, please replace the whole
optical pick-up block.
Never turn the semi-fixed resistor located at the side of optical
pick-up block.

optical pick-up

semi-fixed resistor

• AEP, UK, E model

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 pick­up block. Therefore, when checking the laser diode emission, ob­serve from more than 30 cm away from the objective lens.

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.

TEST DISCS

This set can playback CD-R and CD-ROM discs. The following
test discs should be used to check the capability:

CD-R test disc TCD-R082LMT (Part No. J-2502-063-1)
CD-RW test disc TCD-W082L (Part No. J-2502-063-2)

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 P ARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.

This label is located on the bottom of the chassis.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES
SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT.
NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES
SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL
OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

2

CDX-M9900/M9905X

D

stand

Notes on CD-Rs (recordable CDs)/CD-RWs (rewritable
CDs)

This unit can play the following discs:

Type of discs Label on the disc

Audio CD

MP3 files

• Some CD-Rs/CD-RWs (depending on the equipment used for
its recording or the condition of the disc) may not play on this
unit.

• You cannot play a CD-R/CD-RW that is not finalized∗.

• You can play MP3 files recorded on CD-ROMs, CD-Rs, and

CD-RWs.

• A CD-R/CD-RW to which a session can be added can be played.

∗ A process necessary for a recorded CD-R/CD-RW disc to be

played on the audio CD player.

EXTENSION CABLE AND SERVICE POSITION

When repairing or servicing this set, connect the jig (extension cable)
as shown below.

• Connect the MAIN board (CN401) and the SERV O board (CN2)
with the extension cable (Part No. J-2502-062-1).

NOTE FOR THE OPENING OF THE FRONT PANEL

In this set, the front panel is lowered to below the bottom face when
it is opened.
When servicing the set, place it on a stand having a height of about
2 cm.

FORCED FRONT P ANEL OPEN/CLOSE

The front panel is forced to OPEN/CLOSE at the timing that the
power (ACC) is turned off.
If the Z button for the front panel is not effective, the following
method is used:

With the front panel open: The front panel is closed when A CC is

switched from ON to OFF edge.

With the front panel closed:The front panel is opened when ACC

is switched from ON to OFF edge.

NOTE FOR REPLACEMENT OF THE DIGITAL BOARD

When repairing, the complete DIGITAL board should be replaced
since any parts in the DIGITAL board cannot be repaired.

MAIN BOARD
CN401

J-2502-076-1

SERVO BOAR
CN2

3

CDX-M9900/M9905X

z

UNLEADED SOLDER

Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)

: LEAD FREE MARK

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40°C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!

• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

TABLE OF CONTENTS

1. GENERAL

Location of Controls................................................................ 5

Connections .............................................................................6

2. DISASSEMBLY

2-1. Front Panel Assy ................................................................. 8

2-2. Sub Panel Assy .................................................................... 8

2-3. CD Mechanism Block ......................................................... 9

2-4. Driving Section ................................................................... 9

2-5. Driven (F) Assy, Driving (F) Assy ....................................10

2-6. Digital Board ..................................................................... 10

2-7. Main Board ....................................................................... 11

2-8. Chassis (T) Sub Assy ........................................................11

2-9. Roller Arm Assy ................................................................12

2-10. Chassis (OP) Assy............................................................. 12

2-11. Optical Pick-up ................................................................. 13

2-12. SL Motor Assy (M902) ..................................................... 13

2-13. LE Motor Assy (M903)..................................................... 14

2-14. Servo Board....................................................................... 14

3. DIAGRAMS

3-1. IC Pin Descriptions ...........................................................15

3-2. Block Diagram –CD Section–........................................... 20

3-3. Block Diagram –Main Section–........................................ 21

3-4. Block Diagram –Display Section–.................................... 22

3-5. Circuit Boards Location ....................................................23

3-6. Waveforms......................................................................... 23

3-7. Note for Printed Wiring Boards and

Schematic Diagrams .......................................................... 24

3-8. Printed Wiring Boards –CD Mechanism Section–............ 25

3-9. Schematic Diagram –CD Mechanism Section (1/2)– .......26

3-10. Schematic Diagram –CD Mechanism Section (2/2)– .......27

3-11. Printed Wiring Board –Main Section– .............................. 28

3-12. Schematic Diagram –Main Section (1/3)– ........................ 30

3-13. Schematic Diagram –Main Section (2/3)– ........................ 31

3-14. Schematic Diagram –Main Section (3/3)– ........................ 32

3-15. Schematic Diagram –Display Section–............................. 33

3-16. Printed Wiring Board –Display Section– .......................... 34

3-17. IC Block Diagrams............................................................ 35

4. EXPLODED VIEWS

4-1. Chassis Section ................................................................. 41

4-2. Main Board Section .......................................................... 42

4-3. Front Panel Section ...........................................................43

4-4. CD Mechanism Section (1) ............................................... 44

4-5. CD Mechanism Section (2) ............................................... 45

4-6. CD Mechanism Section (3) ............................................... 46

4-7. CD Mechanism Section (4) ............................................... 47

5. ELECTRICAL PARTS LIST ........................................ 48

4

SECTION 1

GENERAL

CDX-M9900/M9905X

This section is extracted
from instruction manual.

5

CDX-M9900/M9905X

Connections

6

SECTION 2

DISASSEMBLY

Note : This set can be disassemble according to the following sequence.

SET

2-1. FRONT PANEL ASSY

(Page 8)

2-2. SUB PANEL ASSY

(Page 8)

2-3. CD MECHANISM BLOCK

(Page 9)

CDX-M9900/M9905X

2-4. DRIVING SECTION

(DB-A04)
(Page 9)

2-7. MAIN BOARD

(Page 11)

2-5. DRIVEN (F) ASSY,

DRIVING (F) ASSY
(Page 10)

2-11. OPTICAL PICK-UP

(Page 13)

2-6. DIGITAL BOARD

(Page 10)

2-8. CHASSIS (T) SUB ASSY

(Page 11)

2-9. ROLLER ARM ASSY

(Page 12)

2-10. CHASSIS (OP) ASSY

(Page 12)

2-12. SL MOTOR ASSY (M902)

(Page 13)

2-13. LE MOTOR ASSY (M903)

2-14. SERVO BOARD

(Page 14)

(Page 14)

7

CDX-M9900/M9905X

Note : Follow the disassembly procedure in the numerical order given.

2-1. FRONT PANEL ASSY

2

two

screws

(panel F)

4

cover (FPC)

3

5

CN201

(Take care not to pull the

flexible board excessively)

1

two

screws

(panel F)

2-2. SUB PANEL ASSY

3

two claws

6

front panel assy

2

two claws

1

two

screws

x

(+PTT 2.6

6)

4

sub panel assy

8

2-3. CD MECHANISM BLOCK

)

3

screw

(+PTT 2.6

x

6)

4

driving section
(DB-F04)

1

CN701

2

screw

(+PTT 2.6

x

6)

2

screw

(+PTT 2.6

x

5

CD mechanism block

6)

3

4

CN401

7

bracket (CD)

CDX-M9900/M9905X

6

two

screws

(+PTT 2.6

x

4

2-4. DRIVING SECTION

1

screw

(+PTT 2.6

x

6)

9

CDX-M9900/M9905X

d

2-5. DRIVEN (F) ASSY, DRIVING (F) ASSY

To install the assembly, turn the gear (cam LF) and

gear (cam LF)

align the detent with the holes

5

driving (F) assy

A

A

.

To install the assembly,
turn the gear (cam RF) and align

B

the detent with the holes

gear (cam RF)

.

2

joint

2-6. DIGITAL BOARD

1

two

(+STP 2.6

2

CN802

screws

4

drive shaft assy

x

6)

3

three ground point

(+PTT 2.6

x

B

3

driven (F) assy

screws

6)

10

1

CN1302

4

DIGITAl bar

2-7. MAIN BOARD

)

1

ground point

(+PTT 2.6

x

screw

6)

6

CN301

3

two

screws

(+PTT 2.6

2

ground point

(+PTT 2.6

x

6)

x

5

insulating sheet

screw

6)

4

MAIN board

CDX-M9900/M9905X

8

cord (AUX

7

screw

(+PTT 2.6

x

6)

2-8. CHASSIS (T) SUB ASSY

2

two

screws

(+P 1.7

5

SENSOR board

3

claw

x

2.2)

4

claw

1

two

screws

x

(+P 1.7

6

2.2)

chassis (T) sub assy

11

CDX-M9900/M9905X

)

2-9. ROLLER ARM ASSY

4

worm wheel (RA)

1

spring (RAL)

3

washer (1.1 – 2.5)

5

roller arm assy

2

spring (RAR)

2-10. CHASSIS (OP) ASSY

0

compression spring (damper)

4

washer

5

gear (LE1)

lever (D)

6

8

qa

chassis (OP) assy

1

CN1

9

two compression springs (damper

7

slider (R)

12

2

Remove the six solderings.

3

tension coil spring (KF)

2-11. OPTICAL PICK-UP

5

claw

2

chucking arm sub assy

1

tension coil spring (CHKG)

7

optical pick-up

CDX-M9900/M9905X

2-12. SL MOTOR ASSY (M902)

6

main shaft

4

rack (SL)

3

screw

(+B 1.4

x

5)

2

SL motor assy (M902)

1

screw

(+P 1.4

x

1.8)

13

CDX-M9900/M9905X

2-13. LE MOTOR ASSY (M903)

qf

two toothed lock

(+M 1.4

bracket (LEM)

qs

screw

(+M 1.7

x

)

screws

2.5)

6

screw

(+P 1.7

x

qd

2.2)

qa

screw

(+M 1.7

0

woam (LEB) assy

x

2.5)

qg

LE motor assy

(M903)

7

leaf spring (LE)

8

screw

(+M 1.7

9

bearing (LEB)

2

washer

3

gear (LE1)

lever (D)

x

2.5)

4

5

slider (R)

2-14. SERVO BOARD

1

Remove the eight solderings.

1

Remove the soldering.

6

SERVO board

2

Remove the three solderings.

4

toothed lock

(M 1.7)

screw

14

3

CN1

5

claw

SECTION 3

DIAGRAMS

3-1. IC PIN DESCRIPTIONS

• IC3 CXD3059BR (DIGITAL SERVO/DIGITAL SIGNAL PROCESSOR) (SERVO BOARD (1/2))

Pin No. Pin Name I/O Pin Description

1MIRR I/O Mirrer signal input/output
2 DFCT I/O Defect signal input/output
3 FOK I/O Focus OK signal input/output
4 VSS — Ground pin
5 LOCK I/O Not used in this set. (Open)
6 MDP O Spindle motor servo control signal output
7 SSTP I Disc most inner detection signal input
8IOVSS1 — Digital ground pin for I/O

9 SFDR O Sled drive signal output
10 SRDR O Sled drive signal output
11 TFDR O Tracking drive signal output
12 TRDR O Tracking drive signal output
13 FFDR O Focus drive signal output
14 FRDR O Focus drive signal output
15 IOVDD1 — Digital power supply pin for I/O
16 AVDD0 — Analog power supply pin
17 AVSS0 — Analog ground pin
18 NC — Not used. (Open)
19 E I E signal input
20 F I F signal input
21 TEI I Tracking error signal input from the DSSP block
22 TEO O Tracking error signal output to the RF amp block
23 FEI I Focus error signal input from the DSSP block
24 FEO O Focus error signal output to the RF amp block

25 VC I/O

26 A I A signal input
27 B I B signal input
28 C I C signal input
29 D I D signal input
30 NC — Not used. (Open)
31 AVDD4 — Analog power supply pin

32 RFDCO I/O

33 PDSENS I Reference voltage input for PD
34 AC SUM O RFAC suming amp signal output
35 EQ IN I Equalizer circuit signal input
36 LD O APC amp signal output
37 PD I APC amp signal input
38 NC — Not used. (Open)
39 RFC I EQ cut off frequency adjustment input
40 AVSS4 — Analog ground pin
41 RFACO O RFAC signal output
42 RFACI I RFAC signal input or EFM signal input
43 AVDD3 — Analog power supply pin
44 BIAS I Asymmetry circuit constant current input
45 ASYI I Asymmetry comparate voltage input
46 ASYO O EFM full swing signal output
47 VPCO O Charge pump output for wideband EFM PLL
48 VCTL I VCO2 control voltage input for wideband EFM PLL
49 AVSS3 — Analog ground pin

VC voltage output to the RF amp block
Center voltage input from the DSSP block by command select

RFDC signal output
RFDC signal input from the DSSP block by command select

CDX-M9900/M9905X

15

CDX-M9900/M9905X

Pin No. Pin Name I/O Pin Description

50 CLTV I VCO1 control voltage input
51 FILO O Filter signal output for master PLL
52 FILI I Filter signal input for master PLL
53 PCO O Charge pump output for master PLL
54 AVDD5 — Analog power supply pin
55 DDVROUT O DC/DC converter output
56 DDVRSEN I DC/DC converter output voltage monitor signal input
57 AVSS5 — Analog ground pin
58 DDCR I Reset signal input for DC/DC converter
59 NC — Not used. (Open)
60 BCKI I D/A interface bit clock signal input
61 PCMDI I D/A interface serial data signal input
62 LRCKI I D/A interface LR clock signal input
63 LRCK O D/A interface LR clock signal output
64 VSS — Digital ground pin for internal
65 PCMD O D/A interface serial data signal output
66 BCK O D/A interface bit clock signal output
67 VDD — Digital power supply pin for internal
68 EMPH O Not used in this set. (Open)
69 EMPHI I Not used in this set. (Fixed at “L”.)
70 IOVDD2 — Digital power supply pin for I/O
71 DOUT O Digital out signal output

72, 73 TEST I Test pin Normally “L”.

74 IOVSS2 — Digital ground pin for I/O
75 NC — Not used in this set. (Open)
76 XVSS — Ground pin for master clock
77 XTAO O Crystal oscillation circuit output (16.9344 MHz)
78 XTAI I Crystal oscillation circuit input (16.9344 MHz)
79 XVDD — Power supply pin for master clock
80 AVDD1 — Analog power supply pin
81 AOUT1 O L channel analog signal output
82 VREFL O L channel reference voltage output
83 AVSS1 — Analog ground pin
84 AVSS2 — Analog ground pin
85 VREFR O R channel reference voltage output
86 AOUT2 O R channel analog signal output
87 AVDD2 — Analog power supply pin
88 NC — Not used. (Open)
89 IOVDD0 — Digital power supply pin for I/O
90 RMUT O R channel “0” detection flug output
91 LMUT O L channel “0” detection flug output
92 NC — Not used. (Open)
93 XTSL I X’tal select signal input 16.9344 MHz: “L”, 33.8688 MHz: “H”
94 IOVSS0 — Digital ground pin for I/O
95 XTACN I Oscillation circuit control input “H”: Oscillation start, “L”: Oscillation stop
96 SQSO O Sub 80 bit and PCM peak, level data signal output CD text data signal output
97 SQCK I Clock signal input for SQSO read out
98 SBSO O Sub P-W serial data signal output Not used in this set. (Open)

99 EXCK I Clock signal input for SBSO read out Not used in this set. (Open)
100 XRST I System reset signal input “L”: reset
101 SYSM I Mute signal input “H”: mute Not used in this set. (Fixed at “L”.)
102 DATA I Serial data signal input
103 VSS — Digital ground pin for internal

16

CDX-M9900/M9905X

Pin No. Pin Name I/O Pin Description

104 XLAT I Latch signal input
105 CLOK I Serial data transfer clock signal input
106 VDD — Digital power supply pin for internal
107 SENS O SENS signal output
108 SCLK I Clock signal input for SENS serial data read out
109 ATSK I/O Input/output for anti-shock
110 WFCK O WFCK signal output Not used in this set. (Open)
111 XUGF O XUGF signal output Not used in this set. (Open)
112 XPCK O XPCK signal output Not used in this set. (Open)
113 GFS O GFS signal output
114 C2PO O C2PO signal output
115 SCOR O Sub code sync signal output
116 VDD — Digital power supply pin for internal
117 C4M O 4.2336 MHz signal output Not used in this set. (Open)
118 WDCK O Word clock signal output Not used in this set. (Open)
119 COUT I/O Track count signal input/output Not used in this set. (Open)
120 NC — Not used. (Open)

17

CDX-M9900/M9905X

• IC501 MB90F474HPFV-G-178 (SYSTEM CONTROL) (MAIN BOARD (3/3)) (US, Canadian MODEL)

• IC501 MB90F474HPFV-G-179 (SYSTEM CONTROL) (MAIN BOARD (3/3)) (AEP, UK, E MODEL)

Pin No. Pin Name I/O Pin Description

1PGIPower supply OK detection signal input for DC-DC converter

2 FLASH P ON O

3 BEEP O BEEP signal output Used to PPG function.
4MOTOR ON O Motor power supply on signal output
5MOT + O Open/close motor control signal output (+)
6MOT – O Open/close motor control signal output (–)
7 LED ON O CD side illumination on signal output when front panel open
8 FSW IN I DC-DC converter oscillator frequency count signal input Used to input capture.

9 VSS — Ground pin
10 BOOST O Boost signal output
11 ENCSW1 I ENC switch 1 signal input
12 ENCSW2 I ENC switch 2 signal input

13 to 16 NCO O Not used in this set. (Open)

17 T.ROM SDA I/O Tuner EEPROM serial data signal input/output
18 T.ROM SCK O Tuner EEPROM serial clock signal output

19, 20 NCO O Not used in this set. (Open)

21 VCC5 — Power supply pin (+5 V)
22 NS MASK O Tuner noise mask signal output
23 TU MUTE O Tuner mute signal output
24 FLASHW I Flash write mode detection signal input
25 SH3SI/FLSSI I SH3 communication signal input (RXD)/Flash write data signal input
26 SH3SO/FLSSO O SH3 communication signal output (TXD)/Flash write data signal output

27 UNI AU O
28 VOLATT O Electronic volume mute signal output

29 DIAG I Condition signal input from power amplifier IC
30 AMP ON O AMP STB signal output Used to control of power amplifier IC. L: Off, H: On
31 I2CCKO O Serial clock signal output for tuner and electronic volume IC
32 I2CSIO I/O Serial data signal input/output for tuner and electronic volume IC
33 AVCC — Power supply pin (+3.3 V)
34 AVRH — Power supply pin (+3.3 V)
35 AVSS — Ground pin
36 KEYIN0 I key signal input Used to A/D port.
37 TEMP TR I Temperature detection signal input for front panel motor control Used to A/D port.
38 FP IDET I Front panel operation current detection signal input Used to A/D port.
39 QUALITY (RDS) I Tuner noise detection signal input Used to A/D port.
40 VSS — Ground pin
41 RC IN0 I Rotary commander signal input Used to A/D port.
42 VSM I S meter voltage signal input Used to A/D port.

43, 44 NCO O Not used in this set. (Open)

45 KEY ACK I Key acknowledge detection signal input H: On (Used to interruption port.)
46 DAVN (RDS) I RDS data block synchronization detection signal input

47, 48 MD0, MD1 — Connected to power supply pin (+5 V)

49 MD2 — Connected to ground pin
50 NCO O Not used in this set. (Open)
51 BU IN I Back up power supply detection signal input Used to interruption port.

52 to 54 NCO O Not used in this set. (Open)

55 MUTE CON I Mute condition signal input Used to interruption port.
56 UNISI I SONY BUS data signal input Used to serial port.
57 UNISO O SONY BUS data signal output Used to serial port.

Flash write communication signal change control signal output
L: SH-3 communication, H: PC Ver. UP communication

BUS audio in/AUX audio in select control signal output
H: SONY BUS audio, L: AUX audio

18