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CDX-2250/3500
SERVICE MANUAL
US Model Canadian Model
CDX-2250

E Model
CDX-3500

Photo: CDX-2250

SPECIFICATIONS

Model Name Using Similar Mechanism CD Drive Mechanism Type Optical Pick-up Name

CDX-2180 MG-363X-121 KSS-521A

FM/AM COMPACT DISC PLAYER
MICROFILM

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SECTION 4 DIAGRAMS
4-1. IC PIN DESCRIPTION
· IC801 µPD17705GC-537-3B9 (SYSTEM CONTROL) Pin No. Pin Name I/O 1 SIRCS I SIRCS input (A/D) 2 3 4 5 6 7 8 9 10 11 12 13 14, 15 16 17 18 19 20 21 22 23, 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 IN-SW D-SW SELF-SW L-SW LM-EJ LM-LOD AMP/ANT-ON MONO SD BAND-SW AREA1-SW AREA2-SW RE1, 2 SEEK CD-ON FM-ON TU-ON NC GND3 KEYIN3 KEYIN2, 1 ROT-IN S-METER TEST-SW AM-IFC FM-IFC VDD2 VCOH-FM VCOL-AM GND2 NC EO1-PDOUT TESTO AM-ON(TU-ON) FM-ON(FM/AM) LCL/DX BEEP ACC-IN SCOR MUTE AMP-MUTE TEL-MUTE NC VOL-CE VOL-CLK VOL-DATA EMPHO PW-ON MD-ON CD-ON I I I I O O O O I I I I I O I/O I/O I/O -- -- I I I I I I I -- I I -- -- O -- O O O O I I O O O -- O O O O O O O CD mechanism position detection CD mechanism position detection CD mechanism position detection LIMIT switch Loading motor control (Eject direction) Loading motor control (Loading direction) Power control for amplifier. Force MONO output SD signal input Initialize switch input terminal Initialize switch input terminal Initialize switch input terminal Rotary encoder input 1, 2 SEEK output Servo drive power FM select output AM select output Not used. Ground Not used (Connect to ground) A/D key input 2, 1 Rotary commander input FM and AM common signal meter A/D conversion input TEST mode select input AM center frequency input FM center frequency input Power supply (+5 V) Local oscillation frequency input (FM) Local oscillation frequency input (AM) Ground Not used. Error out output Connect to ground AM power output (AM select) FM power output (FM select) LOCAL/DX select ("H" : LOCAL, "L" : DX) BEEP output Accessory input SUBQ data read request System mute output Power amplifier mute output Telephone mute output Fixed at "H" in this set. Electric volume chip select Electric volume serial clock Electric volume serial data De-emphasis control output System power control Loading motor power Servo drive power Pin Description

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Pin No. 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

Pin Name ILL-ON C.ALARM NC NC LCD-CE EZ-SEL SENS FOK LD-ON NC [IN] ST/MONO [OUT] MONO LCD-CKO LCD-So INH SQ-CKo CD-RST SQ-SI CD-SO CD-LAT CD-CKO VREF GND1 X-OUT X-IN BU-IN VDD1 RESET

I/O O I I -- O I I I O -- I/O O O O O O I O O O -- -- -- I I -- I

Pin Description Illumination output Caution alarm select input (Used/Not used) Not used (Connect to ground) Fixed at "H" in this set. LCD drive chip select output SHIFT + input Information input from servo IC. Focus OK input Laser diode control Not used. (Connect to ground) Used for both STEREO indicator display input and force MONO output. (FM) LCD driver serial clock output LCD driver serial data output INHbit output Q data read serial clock output Servo IC/DAC reset output Q data input Serial data output to servo IC. Data latch output to servo IC. Serial clock output to servo IC. Not used. Ground Crystal oscillator connection (4.5 MHz) Crystal oscillator connection (4.5 MHz) Back-up detection Power supply (+5 V) RESET input

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CDX-2250/3500

4-4. SCHEMATIC DIAGRAM -- CD MECHANISM SECTION -- · Refer to page 22 for Waveforms and Note and page 37 for IC Block Diagrams.

(Page 33)

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CDX-2250/3500

4-6. SCHEMATIC DIAGRAM -- DISPLAY SECTION --

(Page 36)

Note: · 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 and 1/4 W or less unless otherwise specified. · U : B+ Line. · Power voltage is dc 14.4V and fed with regulated dc power supply from ACC and BATT cords.

· C : panel designation. · Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM · Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances.

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CDX-2250/3500
4-8. SCHEMATIC DIAGRAM -- MAIN SECTION (1/2) --

(Page 26)

Note: · 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 and 1/4 W or less unless otherwise specified. ¢ · : internal component. · C : panel designation. · U : B+ Line. · Power voltage is dc 14.4V and fed with regulated dc power supply from ACC and BATT cords. · Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM ( ) : AM < > : CD PLAY : Impossible to measure · Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances. · Signal path. F : FM f : AM J : CD · Abbreviation CND : Canadian model.

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CDX-2250/3500

4-8. SCHEMATIC DIAGRAM -- MAIN SECTION (2/2) --

· Refer to page 37 for IC Block Diagrams.

(Page 29)

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· IC Block Diagrams
LTOUT LSIN NC

IC401 LC75374E
LVRIN LCOM LT1 LT2 33 32 + ­ ­ + 31 30 29 LT3

28 27 26 25 24

NC LSB1

23 22 LFIN

LSB2

+ ­

­ +

+ ­

21 LFOUT

DECODER

LATCH

1 RVRIN

2 RCOM

3 4 RT1 RT2

5 RT3

6 7 8 9 10 RTOUT RSIN NC NC RSB1

11 RSB2

IC402 TDA7385

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

IC3 BA6796FP-T1
OP IN ­ OP IN + VREF

CH3-IN

CH2-IN

TAB PW-GND OUT2­ ST-BY OUT2+ Vcc1 OUT1­ PW-GND1 OUT1+ SVR IN1 IN2 S-GND IN4 IN3 AC-GND OUT3+ PW-GND3 OUT3­ Vcc2 OUT4+ MUTE OUT4­ PW-GND4 DIAGNOSTICS OUT

CH1-IN

CH1 +

28

27

26

25

24

23

22

21

20

19

CH1 ­

CH3

CH2

CH2 +

VCC

18

17

16

15

LEVEL SHIFT

VCC LEVEL SHIFT

DRIVE BUFFER

DRIVE BUFFER

DRIVE BUFFER

DRIVE BUFFER

LEVEL SHIFT

THERMAL SHUT DOWN

LEVEL SHIFT

LOGIC CTL1 CTL2 FWD REV

V/I

DRIVE BUFFER

DRIVE BUFFER

DRIVE BUFFER

DRIVE BUFFER

DRIVE BUFFER

1

2

3

4

5

6

7

8

9

10

11

12

13

14

CTL1

CH5 ­

CH4 +

CH3 +

CH4-IN

OPOUT

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CH3 ­

REV

TRAY

CTL2

CH4

FWD

GND

COM

CH2 ­

CH1

+ ­

R1 R2 R3 R4 RSELO

40 41 42 43 44

+ ­

­ +

­ +

­ +

VDD 39

­ +

LSELO L4 L3 L2 L1

34 35 36 37 38

+ ­ + ­

20 LROUT

19 VREF CONTROL 18 CE 17 DI 16 CL 15 VSS 14 RROUT

+ ­

+ ­ SHIFT REGISTER + ­

13 RFOUT 12 RFIN

IC2 CXA1782BQ
PHD 2 PHD 1 RF M RF O PHD RF I CC1 CC2 CP CB FOK LD

36

35

34

33

32

31

30

29

28

27 26 25

APC

LEVEL S

FOK

MIRR RF IV AMP1 DFCT

IIL TTL

24 23

SENS C.OUT

TTL RF IV AMP2 FE BIAS 37 TTL IIL DATA REGISTER INPUT SHIFT REGISTER ADDRESS DECODER
FE AMP

22 21 20

XRST DATA XLT CLK

IIL IIL OUTPUT DECODER 19

F

38 F IV AMP TOG1-3 BAL1-3 FZC COMP FS1-4 TG1-2 TM1-7 PS1-4

E

39

18

VCC

E IV AMP EI 40 TE AMP
BAL1 BAL 3 BAL2

HPF COMP VEE

LPF COMP

TRACKING PHASE COMPENSATION TM6

ISET

17

ISET

41 TG1 16
TOG1 TOG2 TOG3

TED 42

SL O SL M

TM5 TM4 TZC COMP FCS PHASE COMPENSATION TM3 TM2

15

LPFI 43 TEI 44 WINDOW COMP ATSC DFCT

14

SL P

DFCT TM1 FS1 TM7 FS2 13 TA O

ATSC 45 TZC 46

TDFCT 47
TG2

VC

48

FS4

1
FEO

2
FEI

3
FDFCT

4
FGD

5
FLB

6
FE O

7
FE M

8 9
SRCH TGU

10
TG2

11
FSET

F SET

12
TA M

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