sony CDX-4280 Service Manual

CDX-4280

SERVICE MANUAL

SPECIFICATIONS

E Model

Model Name Using Similar Mechanism CDX-4180
CD Drive Mechanism Type MG-363X-121
Optical Pick-up Name KSS-521A

CD player section

System Compact disc digital audio

Signal-to-noise ratio 90 dB
Frequency response 10 - 20,000 Hz
Wow and flutter Below measurable limit

T uner section

FM

Tuning range FM tuning interval:

Antenna terminal External antenna connector
Intermediate frequency 10.7 MHz
Usable sensitivity 8 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 65 dB (stereo),

Harmonic distortion at 1 kHz

Separation 35 dB at 1 kHz
Frequency response 30 - 15,000 Hz
Capture ratio 2 dB

AM

Tuning range AM tuning interval:

Antenna terminal External antenna connector
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity 30 µV

system

50 kHz/200 kHz switchable

87.5 - 108.0 MHz
(at 50 kHz step)

87.5 - 107.9 MHz
(at 200 kHz step)

68 dB (mono)

0.5% (stereo),

0.3% (mono)

9 kHz/10 kHz switchable
531 - 1,602 kHz
(at 9 kHz step)
530 - 1,710 kHz
(at 10 kHz step)

Power amplifier section

Outputs Speaker outputs

Speaker impedance 4 - 8 ohms
Maximum power output 40 W × 4 (at 4 ohms)

General

Outputs Line outputs (2)

Tone controls Bass ± 10 dB at 100 Hz

Power requirements 12 V DC car battery
Dimensions Approx. 178 × 50 × 185 mm
Mounting dimensions Approx. 182 × 53 × 162 mm

Mass Approx. 1.2 kg
Supplied accessories Parts for installation and

Design and specifications are subject to change without
notice.

(sure seal connectors)

Power antenna relay
control/Power amplifier
control lead
Telephone ATT control
lead

Treble ± 10 dB at 10 kHz

(negative ground)

(w/h/d)

(w/h/d)

connections (1 set)
Front panel case (1)

MICROFILM

FM/AM COMPACT DISC PLAYER

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SECTION 4

DIAGRAMS

4-1. IC PIN DESCRIPTION

• IC801 µPD17705GC-526-3B9 (SYSTEM CONTROL)

Pin No. Pin Name I/O Pin Description

1 SIRCS I SIRCS input (A/D)
2 IN-SW I CD mechanism position detection
3 D-SW I CD mechanism position detection
4 SELF-SW I CD mechanism position detection
5 L-SW I LIMIT switch
6 LM-EJ O Loading motor control (Eject direction)
7 LM-LOD O Loading motor control (Loading direction)
8 ANT-ON O Power control for amplifier.

9 MONO O Force MONO output
10 SD I SD signal input
11 BAND-SW I Band plan setting of general area.
12 AREA1-SW I Destination select 1 (Fixed at “L”.)
13 AREA2-SW I Destination select 2 (Fixed at “H”.)

14, 15 RE1, 2 I Rotary encoder input 1, 2

16 SEEK O SEEK output

17 – 20 NC — Not used.

21 GND3 — GND

22 – 24 KEYIN3 – 1 I A/D key input 3 – 1

25 ROT-IN I Rotary commander input
26 S-METER I FM and AM common signal meter A/D conversion input
27 TEST-SW I TEST mode select input
28 AM-IFC I AM center frequency input
29 FM-IFC I FM center frequency input
30 VDD2 — Power supply (+5 V)
31 VCOH-FM I Local oscillation frequency input (FM)
32 VCOL-AM I Local oscillation frequency input (AM)
33 GND2 — GND
34 NC — Not used.
35 EO1-PDOUT O Error out output
36 TESTO — Fixed at “L”.
37 AM-ON(TU-ON) O AM power output (AM select)
38 FM-ON(FM/AM) O FM power output (FM select)
39 LCL/DX O LOCAL/DX select (“H” : LOCAL, “L” : DX)
40 BEEP O BEEP output
41 ACC-IN I Accessory input
42 SCOR I SUBQ data read request
43 MUTE O System mute output
44 AMP-MUTE O Power amplifier mute output
45 TEL-MUTE O Telephone mute output
46 NC — Not used.
47 VOL-CE O Electric volume chip select
48 VOL-CLK O Electric volume serial clock
49 VOL-DATA O Electric volume serial data
50 EMPHO O De-emphasis control output
51 PW-ON O System power control
52 MD-ON O Loading motor power
53 CD-ON O Servo drive power
54 ILL-ON O Illumination output

55, 56 MOD1, 2 O Bus boost control 1, 2

57 NC — Not used.
58 LCD-CE O LCD drive chip select output

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Pin No. Pin Name I/O Pin Description

59 EZ-SEL I SHIFT + input
60 SENS I Information input from servo IC.
61 FOK I Focus OK input
62 LD-ON O Laser diode control
63 NC — Not used.
64 ST/MONO I/O Used for both STEREO indicator display input and force MONO output. (FM)
65 LCD-CKO O LCD driver serial clock output
66 LCD-SO O LCD driver serial data output
67 C.ALARM O Caution alarm output
68 SQ-CKO O Q data read serial clock output
69 CD-RST O Servo IC/DAC reset output
70 SQ-SI I Q data input
71 CD-SO O Serial data output to servo IC.
72 CD-LAT O Data latch output to servo IC.
73 CD-CKO O Serial clock output to servo IC.
74 VREF — Not used.
75 GND1 — GND
76 X-OUT O Crystal oscillator connection (4.5 MHz)
77 X-IN I Crystal oscillator connection (4.5 MHz)
78 BU-IN I Back-up detection
79 VDD1 — Power supply (+5 V)
80 RESET I RESET input

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