Sony HCD-GX25 / MHC-GX25 Service Manual ▷ View online
17
HCD-GX25
SECTION 3
DIAGRAMS
3-1. IC PIN DESCRIPTION
• IC601 LC876756C-51H7-E (SYSTEM CONTROL, FLD CONTROL) (PANEL BOARD)
Pin No.
Pin Name
I/O
Pin Description
1
SYS MUTE
O
System mute signal output
2
BU1924 DATA
I
Not used in this set. (Connected to ground.)
3
PWR DOWN
I
Power down signal input
4
LC78646 RESET
O
CD reset signal output to the IC721 (LC78646)
5
LC78646 CE
O
CD CE signal output to the IC721 (LC78646)
6
LC78646 CE (MP3)
O
CD CE (MP3) signal output (Not used in this set.)
7
M61519 CLK
O
Clock signal output to the IC301 (M61529FP)
8
BU2099FV LCK
O
LCK signal output to the IC309 (BU2099FV)
9
LC72121 CE
O
CE signal output to the TU701 (tuner pack)
10
LC78684 SYNC
I
SYNC signal input
11
RESET
I
Reset signal input from the IC603
12
XT1
I
Oscillater connect pin (32.768 kHz)
13
XT2
O
Oscillater connect pin (32.768 kHz)
14
VSS1
—
Ground pin
15
CF1
I
Ceramic vibrator connect pin (8.64 MHz)
16
CF2
O
Ceramic vibrator connect pin (8.64 MHz)
17
VDD
—
Power supply pin (+3.3 V)
18
TAPE A STAT
I
Tape A start signal input
19
TAPE B STAT
I
Tape B start signal input
20
CD ENCODER
I
CD encoder switch signal input
21
SW ON/OFF SENSOR
I
Switch control on/off signal input
22
STREAM IN
I
Stream in signal input
23
VACS
I
VACS signal input
24
KEY2
I
Key signal input 2
25
KEY1
I
Key signal input 1
26
KEY0
I
Key signal input 0
27
PROTECTOR (HOLD)
I
Protector (Hold) signal input
28
REMOCON IN
I
Remote control signal input from the RM601
29
BU1924 CLK
I
Not used in this set. (Connected to ground.)
30 – 41
G12 – G1
O
FLD control signal output
42 – 45
P1 – P4
O
FLD control signal output
46
VDD3
—
Power supply pin (+3.3 V)
47 – 50
P5 – P8
O
FLD control signal output
51
VPP
—
Ground pin
52 – 55
P9 – P12
O
FLD control signal output
56
SW1 (a) P13
O
FLD control signal output
57
SW2 (b) P14
O
FLD control signal output
58
SW3 (c) P15
O
FLD control signal output
59
SW4 (d) P16
O
FLD control signal output
60
SW5 P17
O
FLD control signal output
61
SW6 P18
O
FLD control signal output
62
SW7 P19
O
FLD control signal output
63
SW8 P20
O
FLD control signal output
64, 65
P21, P22
O
FLD control signal output
66
ENTER LED
O
Not used in this set. (Open)
67
MD/VIDEO LED
O
Not used in this set. (Open)
68
GAME LED
O
GAME LED (LED612) drive signal output
69
TAPE LED
O
TAPE LED (LED609) drive signal output
70
TUNER LED
O
TUNER LED (LED608) drive signal output
71
CD LED
O
CD LED (LED607) drive signal output
72
VDD4
—
Power supply pin (+3.3 V)
18
HCD-GX25
Pin No.
Pin Name
I/O
Pin Description
73
CD VDD
—
CD power supply pin
74
TUNER TUNED
I
Tuner tuning signal input from the TU701 (tuner pack)
75
TUNER STEREO
I
Tuner stereo signal input from the TU701 (tuner pack)
76
CD DRF
I
CD DRF signal input from the IC721 (LC78646)
77
CD WRQ
I
CD WRQ signal input from the IC721 (LC78646)
78
CD NUMBER SENSOR
I
CD number sensor signal input
79
TAPE AMS IN
I
Tape AMS signal input
80
VR ENCODER A
I
VR encoder (VR601) signal input
81
VR ENCODER B
I
VR encoder (VR601) signal input
82
TAPE REEL A
I
Tape reel A signal input
83
TAPE REEL B
I
Tape reel B signal input
84
MODE SW IN
I
Mode switch signal input
85
STREAM 1 LED
O
Stream LED (LED611) drive signal output
86
CD MUTE
O
CD mute signal output
87
STREAM 3 LED
O
Not used in this set. (Open)
88
MECHA VCC
O
Mechanism power control signal output “L”: ON, “H”: OFF
89
VSS2
—
Ground pin
90
VDD2
—
Power supply pin (+3.3 V)
91
TAPE SOL A
O
Tape SOL A control signal output “L”: ON, “H”: OFF
92
TAPE SOL B
O
Tape SOL B control signal output “L”: ON, “H”: OFF
93
POWER LED
O
POWER LED (LED614) drive signal output
94
POWER RELAY
O
Power relay signal output
95
LC72121/M61529
O
Serial data signal output
/BU2099FV DO
96
LC72121 DI
I
Serial data signal input
97
LC72121/BU2099FV CLK
O
Serial clock signal output
98
LC78646/LC78684 DO
O
Serial data signal output
99
LC78646/LC78684 DI
I
Serial data signal input
100
LC78646/LC78684 CLK
O
Serial clock signal output
19
HCD-GX25
3-2. CIRCUIT BOARDS LOCATION
MAIN board
DRIVER board
SW board
MOTOR (LD) board
MOTOR (TB) board
VIDEO OUT board
BD board
SENSOR board
TRANS board
AMP board
H/P JACK board
GAME JACK board
PANEL board
REMOTE board
1 STREAM LED board
20
HCD-GX25
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
for schematic diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
%
: indicates tolerance.
•
f
: internal component.
•
C
: panel designation.
•
A
: B+ Line.
•
B
: B– Line.
•
H
: adjustment for repair.
• Voltage and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
no mark : FM
(
tion tolerances.
no mark : FM
(
) : CD
[
] : TAPE
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
E
: PB (DECK A)
d
: PB (DECK B)
G
: REC (DECK B)
J
: CD
c
: digital out
for printed wiring boards:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
x
: parts mounted on the conductor side.
•
: Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
• Waveforms
— BD Board —
(MODE: CD PLAY)
1
2
0.9Vp-p
3
16.9344MHz
IC721
rl
(XIN)
4
IC721
tk
(LRSY)
1Vp-p
0.9Vp-p
3Vp-p
IC721
4
(RF)
IC721
3
(EFMIN)
22µsec
—
PANEL Board
—
1
2
8.64MHz
IC601
qg
(CF1)
32.768kHz
IC601
qs
(XT1)
1.2Vp-p
1Vp-p
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