Diagrams; Ic Pin Description; Circuit Boards Location - Sony CFD-S550 Service Manual

6-1. IC PIN DESCRIPTION

• IC802 uPD789477GC-A27-8BT (SYSTEM CONTROLLER)
Pin No. Pin Name I/O
1, 2 NC — Not used. (Open)
3 to 5 VLC2 to 0 I LCD drive bias voltage input
6 to 9 COM0 to 3 O LCD drive common output
10 to 26 S0 to 16 O LCD drive segment output
27 REC I Tape record signal input
28 AC-CHK I AC power supply detection signal input
29 CD-DOOR I CD door open/close switch input L: Close
30 S-ROCK O ROCK LED control signal output
31 S-POP O POP LED control signal output
32 S-JAZZ O JAZZ LED control signal output
33 S-VOCAL O VOCAL LED control signal output
34 LINE IN O LINE IN control signal output
35 A-MUTE O Audio mute output H: Mute
36 CD O CD function output H: CD
37 TAPE O Tape function output H: Tape
38 AVDD — Analog power supply pin for A/D converter (+3.3 V)
39 BTT-CHK-H I Battery check input for Hi-voltage
40 BTT-CHK-M I Battery check input for Mid-voltage
41 V CHECK I Voltage check input
42 to 45 KEY4 to 1 I Key input
46 MODE CHK I Destination setting input
47 AGND — Analog ground for A/D converter
48 REMOTE I Sircs receiver data input
49 TC-PLAY I Tape play switch input L: Play
50 WP/INI O Wake-up/Initial setting read signal output
51 3.3V MONITOR I 3.3V MONITOR signal input
52 C-WRQ I CD write request data input
53 C-DOUT I CD digital signal processor data input
54 C-DIN O CD digital signal processor data output
55 C-CLK I CD serial data transfer clock signal input
56 R-COUNT I Tuner PLL IF count input
57 R-DATA O Tuner PLL data output
58 R-CLK O Tuner PLL clock output
59 R-LAT O Tuner PLL latch output
60 B-MUTE O Tuner mute signal output
61 C-DRF I CD DRF signal input
62 C-CE O CD chip enable output
63 C-FSEQ I CD frame SYNC input
64 C-XRT O CD system reset output
65 P-CON O System power control output
66 ISS1 O ISS1 output
67 ISS2 O ISS2 output
68 DBB O MEGA BASS control output
69 ICO I Connected to VSS.
70 XT1 I Sub system oscillation input (32.768 kHz)
71 XT2 O Sub system oscillation output (32.768 kHz)
72 VDD — Main power supply pin for A/D converter (+3.3 V)
73 VSS — Main ground
74 X1 I Main system oscillation input (4.19 MHz)
SECTION 6

DIAGRAMS

Pin Description
H: REC
L: AC in
H: Mute
H: PCON
H: MEGA BASS off, L: MEGA BASS on
Pin No. Pin Name I/O
75 X2 O
76 RST
77 V-CLK O
78 V-DATA O
79 SCL O
80 SDA I/O

6-2. CIRCUIT BOARDS LOCATION

HEADPHONE board
FUNCTION KEY board
LCD board
POWER board
VOL SEL board
(Saudi Arabia model only)
BATTERY (2) board
TEN KEY board
17 17
Pin Description
Main system oscillation output (4.19 MHz)
I System reset input
Volume clock output
Volume data output
EEPROM clock output
EEPROM input/output
LINE IN board
(US, Canadian model only)
POWER KEY board
CD BUTTON board
CD board
MAIN board TC board
BATTERY (1) board
CFD-S550
VOL board
SOUND board
TUNER board