Sony DHC-EX77MD / DHC-MD77 / MDS-EX77 / MDS-EX770 Service Manual ▷ View online
– 65 –
MAIN BOARD IC401 RU8X12MF-0010 (SYSTEM CONTROLLER)
Pin No. Pin Name
I / O
Function
1
DAOUT0
O
Output terminal for the test C1 is output when test mode
2
DAOUT1
O
Output terminal for the test ADER is output when test mode
3
KEY0
I
Key input terminal (A/D input)
fl, ), 0, p, ENTER/YES, EDIT/NO keys input (S701 to S706)
fl, ), 0, p, ENTER/YES, EDIT/NO keys input (S701 to S706)
4
KEY1
I
Key input terminal (A/D input)
§ EJECT, PROGRAM, SHUFFLE, CONTINUE keys input (S711 to S714)
§ EJECT, PROGRAM, SHUFFLE, CONTINUE keys input (S711 to S714)
5
KEY2
I
Key input terminal (A/D input)
SCROLL, DISPLAY/CHARACTER, REPEAT, CD SYNC,
SCROLL, DISPLAY/CHARACTER, REPEAT, CD SYNC,
r REC keys input (S722 to S726)
6
CHACK-IN
I
Detection input from the disc chucking-in detect switch (S685) “L”: chucking
7
PACK-IN
I
Detection input from the disc detect switch Not used (fixed at “H”)
8
PACK-OUT
I
Detection input from the loading-out detect switch (S686) “L” at a load-out position, others: “H”
9
TIMER
I
Power switch (S408) input (for service)
10
NC
I
Not used (fixed at “L”)
11
AVSS
—
Ground terminal
12
XINT
I
Interrupt status input from the CXD2650R (IC121)
13
PDOWN
I
Power down detection signal input from the regulated power supply IC (IC501)
“L”: power down, normally: “H”
“L”: power down, normally: “H”
14
NC
—
Not used (connected to AUBK (pin
%ª) in this set)
15
SQSY
I
Subcode Q sync (SCOR) input from the CXD2650R (IC121)
“L” is input every 13.3 msec Almost all, “H” is input
“L” is input every 13.3 msec Almost all, “H” is input
16
DQSY
I
Digital In U-bit CD format subcode Q sync (SCOR) input from the CXD2650R (IC121)
“L” is input every 13.3 msec Almost all, “H” is input
“L” is input every 13.3 msec Almost all, “H” is input
17
NC
—
18
NC
—
Not used (open)
19
NC
—
20
SYS-RST
I
System reset signal input from the regulated power supply IC (IC501) “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
21
TEST
I
Input terminal for the test Fixed at “L” in this set
22
+3.3V
—
Power supply terminal (+3.3V)
23
BACK
I
Power supply terminal for the backup (for internal RAM)
24
XOUT-T
O
Sub system clock output terminal (32.768 kHz)
25
XIN-T
I
Sub system clock input terminal (32.768 kHz)
26
GND
—
Ground terminal
27
XOUT
O
Main system clock output terminal (12 MHz)
28
XIN
I
Main system clock input terminal (12 MHz)
29
GND
—
Ground terminal
30
S1
O
System clock output terminal Not used (open)
31
DOSEL
O
Not used (open)
32
SENS
I
Internal status (SENSE) input from the CXD2650R (IC121)
33
SHOCK
I
Track jump detection signal input from the CXD2650R (IC121)
34
NC
—
Not used (open)
35
CD/VIDEO
O
Selection signal output terminal for the optical-in signal (CD/VIDEO) “L”: CD, “H”: VIDEO
36
STB
O
Strobe signal output to the regulated power supply IC (IC501)
“H”: power on, “L”: standby mode
“H”: power on, “L”: standby mode
37
REC-P
I
Detection input from the recording position detect switch (S688) “L” active
38
PB-P
I
Detection input from the playback position detect switch (S687) “L” active
– 66 –
Pin No. Pin Name
I / O
Function
39
LD LOW
O
Loading motor voltage control signal output to the loading motor driver (IC311)
40
NC
—
Not used (open)
41
MNT2
I
Monitor 2 signal input from the CXD2650R (IC121)
42
MNT3
I
Monitor 3 signal input from the CXD2650R (IC121)
43
LED0
O
LED drive signal output terminal Not used (open)
44
NC
—
Not used (open)
45
NC
—
Not used (open)
46
BUS-OUT
O
Audio bus signal output terminal
47
GND
—
Ground terminal
48
+3.3V
—
Power supply terminal (+3.3V)
49
NC
—
Not used (open)
50
JOG1
I
JOG dial pulse input of the rotary encoder (S741)
51
JOG0
I
JOG dial pulse input of the rotary encoder (S741)
52
SDA
I/O
Two-way data bus for the EEPROM (IC171)
53
SCL
O
Clock signal output to the EEPROM (IC171)
54
FS32
O
LED drive signal output terminal of the 32 kHz indication LED (D734) “L”: LED on
55
FS44
O
LED drive signal output terminal of the 44.1 kHz indication LED (D735) “L”: LED on
56
FS48
O
LED drive signal output terminal of the 48 kHz indication LED (D736) “L”: LED on
57
NC
—
Not used (open)
58
NC
—
Not used (open)
59
AUBK
I
Check signal input of the audio bus connection
60
SA/SW
O
Selection signal output terminal of the audio bus and remote controller Not used (open)
61
AIN
O
LED drive signal output terminal of the ANALOG IN indication LED (D733) “L”: LED on
62
NC
—
Not used (open)
63
CLKSET0
I
Clock destination selected terminal (fixed at “H” in this set)
64
CLKSET1
I
Clock destination selected terminal (fixed at “L” in this set)
65
GND
—
Ground terminal
66
+3.3V
—
Power supply terminal (+3.3V)
67
SCLK
O
Serial clock signal output to the CXD2650R (IC121) and A/D, D/A converter (IC201)
68
SWDT
O
Writing data output to the CXD2650R (IC121) and A/D, D/A converter (IC201)
69
SRDT
I
Reading data input from the CXD2650R (IC121)
70
NC
—
Not used (open)
71
FLCLK
O
Serial data transfer clock signal output to the fluorescent indicator tube driver (IC701)
72
FLDATA
O
Serial data output to the fluorescent indicator tube driver (IC701)
73
FLCS
O
Chip select signal output to the fluorescent indicator tube driver (IC701)
74
NC
—
Not used (open)
75
LDON
O
Laser diode on/off control signal output to the automatic power control circuit “H”: laser on
76
PIT/GRV
O
Pit/groove detection signal output terminal
“H” is output for the playback only disc or TOC area Not used (open)
“H” is output for the playback only disc or TOC area Not used (open)
77
FOK
I
Focus OK signal input from the CXD2650R (IC121) “H” is input when focus is on
78
NC
—
Not used (open)
79
LOCK
O
Lock signal output terminal Not used (open)
80
WRPWR
O
Laser power select signal output to the CXD2650R (IC121)
“H”: recording mode, “L”: playback mode
“H”: recording mode, “L”: playback mode
81
DIG-RST
O
Reset signal output to the CXD2650R (IC121) and BH6511FS (IC152) “L”: reset
– 67 –
Pin No. Pin Name
I / O
Function
82
BEEP
O
Beep sound drive signal output terminal Not used (open)
83
ADARES
O
Reset signal output to the A/D, D/A converter (IC201) “L”: reset
84
SWL-A
O
Not used (open)
85
SEL-B
O
Not used (open)
Laser modulation select signal output
Playback power: “L”, Stop: “H”,
Recording power:
86
MOD
O
87
REC/PB
O
Not used (open)
88
NC
—
Not used (open)
89
SCTX
O
Recording data output enable signal output to the CXD2650R (IC121)
Writing data transmission timing output (Also serves as the magnetic head on/off output)
Writing data transmission timing output (Also serves as the magnetic head on/off output)
90
XLATCH
O
Serial latch signal output to the CXD2650R (IC121) and A/D, D/A converter (IC201)
91
NC
—
Not used (open)
92
NC
—
Not used (open)
93
MUTE
O
Line mute control signal output to the CXA8065S (IC101)
94
LDOUT
O
Motor control signal output to the loading motor driver (IC311) *1
95
LDIN
O
Motor control signal output to the loading motor driver (IC311) *1
96
LIMIT-IN
I
Detection input from the sled limit-in detect switch (S681)
The optical pick-up is inner position when “L”
The optical pick-up is inner position when “L”
97
PROTECT
I
Rec-proof claw detect input from the protect detect switch (S683) “H”: write protect
98
REFLECT
I
Detection input from the disc reflection rate detect switch (S682)
“L”: high reflection rate disc, “H”: low reflection rate disc
“L”: high reflection rate disc, “H”: low reflection rate disc
99
GND
—
Ground terminal
100
+3.3V
—
Power supply terminal (+3.3V)
2 sec
0.5 sec
*1 Loading Motor Control
I N
OUT
BRAKE
RUN IDLE
LDIN (pin
(∞)
“H”
“L”
“H”
“L”
LDOUT (pin
(¢)
“L”
“H”
“H”
“L”
Terminal
Operation
– 68 –
SECTION 7
EXPLODED VIEWS
1
X-4947-652-1 PANEL ASSY, FRONT
2
4-962-708-01 EMBLEM (4-A), SONY
3
4-985-889-01 BUTTON (REC) (CD SYNC,
r REC)
4
4-985-890-01 BUTTON (MODE)
5
4-985-891-01 BUTTON (EJECT) (
§ EJECT)
6
4-985-894-01 BUTTON (EDIT)
7
X-4947-763-1 BUTTON (F/R) ASSY (
0, ))
8
4-985-892-01 BUTTON (PLAY) (
fl, p)
* 9
A-4699-657-A PANEL BOARD, COMPLETE
10
1-777-654-11 WIRE (FLAT TYPE) (19 CORE)
11
1-777-558-11 WIRE (FLAT TYPE) (19 CORE)
12
1-777-559-11 WIRE (FLAT TYPE) (29 CORE)
* 13
A-4699-656-A MAIN BOARD, COMPLETE
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
14
3-363-099-01 SCREW (CASE 3 TP2)
* 15
4-985-899-11 CASE
* 16
4-985-898-12 PANEL (MDS), BACK
* 17
3-350-847-21 HOLDER, PCB
18
4-965-822-01 FOOT
19
4-977-699-11 LEG (F)
20
1-777-473-11 WIRE (FLAT TYPE) (5 CORE)
21
4-951-620-01 SCREW (2.6X8), +BVTP
* 22
1-663-192-11 REC VOL BOARD
23
4-985-896-01 KNOB (REC)
24
4-985-925-01 KNOB (JOG)
25
4-988-161-01 SPRING, RING
3
1
2
7
6
5
8
25
not
supplied
supplied
not supplied
23
20
22
21
21
21
#1
#1
#6
#6
#1
16
15
14
13
not
supplied
supplied
14
18
not supplied
19
11
12
10
9
4
17
24
MDM-3A
NOTE:
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
one.
• Color Indication of Appearance Parts Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑
↑
Parts Color Cabinet’s Color
• Items marked “
∗
” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
delay should be anticipated when ordering
these items.
• The mechanical parts with no reference num-
ber in the exploded views are not supplied.
•
Hardware (# mark) list is given in the last of
the electrical parts list.
the electrical parts list.
The components identified by mark
! or dotted line with mark ! are
! or dotted line with mark ! are
critical for safety.
Replace only with part number
specified.
Replace only with part number
specified.
(1) CHASSIS SECTION
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