Sony MHC-EX66 / TC-EX66 / TC-EX660 Service Manual ▷ View online
– 13 –
•
Adjustment Parts Location
CN801
TEST Mode
TEST Mode
RV152
Record BIAS (L-CH)
Record BIAS (L-CH)
RV252
Record BIAS (R-CH)
Record BIAS (R-CH)
RV253
Record Level (R-CH)
Record Level (R-CH)
RV153
Record Level (L-CH)
Record Level (L-CH)
RV151
Playback Level (L-CH)
Playback Level (L-CH)
RV251
Playback Level (R-CH)
Playback Level (R-CH)
J301
CN11
[MAIN BOARD] (Component Side)
– 14 –
•
IC Block Diagrams
1
2
3
4
5
6
7
8
9
10
16
15
14
13
12
11
GP
GL
GH
I
REF
VCC
IN
(R)
GND
(R)
OUT
(R)
IN
(L)
GND
(L)
OUT
(L)
f/Q
fQ
fM
REF
GND
VEE
CONTROL
EQ
EQ
1
2
3
4
5
6
7
8
9
10
GND
MOTOR
DRIVE
NOISE
FILTER
CLAMP
FWD.IN
REV.IN
VCC 1
VCC 2
NOISE
FILTER
MOTOR
DRIVE
MOTOR
DRIVE
MOTOR
DRIVE
T.S.D
O.C.P
FWD/REV/STOP
CONTROL LOGIC
IC304
CXA1198AP
IC804
LB1641
ON/OFF
CURRENT
LIMITER
START
CIRCUIT
VREF
OVER HEAT
PROTECT
ON/OFF
CURRENT
LIMITER
1
2
3
4
5
6
7
8
9
10
VCC
VMUTE
VCC
VREF
ERROR
AMP
VREF
ERROR
AMP
VO1
VCC
CN1
EN
EN DISPLAY
GND
NC
CN2
VEE
VO2
~
_1.8V
~_
140uA
COMPARATER
IC805
LA5617
SECTION 5
DIAGRAMS
– 25 –
1
PULSE
I
Pulse signal input
2
NO-USE
–
Not used (Fixed at “L”)
3
METER-L
I
Digital peak level meter signal input (L-ch)
4
METER-R
I
Digital peak level meter signal input (R-ch)
5
AD-GND
–
Ground for A/D converter
6
TEST
I
Not used (Fixed at “L”)
7
NO-USE
–
Not-used (Open)
8
NO-USE
–
Not-used (Fixed at “L”)
9
SYS-GND
–
Ground for system
10
OSC-OUT
O
System clock output (4 MHz)
11
OSC-IN
I
System clock input (4 MHz)
12
RESET
I
Reset signal input
13
AUB-IN
I
Audio bus input
14
AUB-OUT
O
Audio bus output
15
NO-USE
–
Not used (Fixed at “L”)
16
NO-USE
–
Not used (Fixed at “L”)
17
NO-USE
–
Not used (Fixed at “L”)
18
NO-USE
–
Not used (Fixed at “L”)
19
NO-USE
–
Not used (Fixed at “L”)
20
DOLBY C/B
O
DOLBY B/C select signal output “L”: DOLBY B, “H”: DOLBY C
21
DOLBY ON/OFF
O
DOLBY on/off select signal output “L”: DOLBY off, “H”: DOLBY on
22
CDSYNC-LED
O
Control output to CD SYNC LED (D851)
23
SEG17
O
Segment signal output to fluorescent indicator tube (FLT851)
24
SEG16
O
Segment signal output to fluorescent indicator tube (FLT851)
25
SEG15
O
Segment signal output to fluorescent indicator tube (FLT851)
26
SEG14
O
Segment signal output to fluorescent indicator tube (FLT851)
27
SEG13
O
Segment signal output to fluorescent indicator tube (FLT851)
28
SEG12
O
Segment signal output to fluorescent indicator tube (FLT851)
29
SEG11
O
Segment signal output to fluorescent indicator tube (FLT851)
30
SEG10
O
Segment signal output to fluorescent indicator tube (FLT851)
31
SEG9
O
Segment signal output to fluorescent indicator tube (FLT851)
32
SEG8
O
Segment signal output to fluorescent indicator tube (FLT851)
33
SEG7
O
Segment signal output to fluorescent indicator tube (FLT851)
34
SEG6
O
Segment signal output to fluorescent indicator tube (FLT851)
35
SEG5
O
Segment signal output to fluorescent indicator tube (FLT851)
36
SEG4
O
Segment signal output to fluorescent indicator tube (FLT851)
37
SEG3
O
Segment signal output to fluorescent indicator tube (FLT851)
38
SEG2
O
Segment signal output to fluorescent indicator tube (FLT851)
39
SEG1
O
Segment signal output to fluorescent indicator tube (FLT851)
40
FL-GND
I
Ground for fluorescent indicator tube (Fixed at “L” (–20 V))
41
GRID 1
O
Grid signal output to fluorescent indicator tube (FLT851)
42
GRID 2
O
Grid signal output to fluorescent indicator tube (FLT851)
43
GRID 3
O
Grid signal output to fluorescent indicator tube (FLT851)
44
GRID 4
O
Grid signal output to fluorescent indicator tube (FLT851)
45
GRID 5
O
Grid signal output to fluorescent indicator tube (FLT851)
5-3.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC801
HD6433724E66F (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Function
– 26 –
46
NO-USE
–
Not used (Open)
47
NO-USE
–
Not used (Open)
48
NO-USE
–
Not used (Open)
49
TYPE IV
O
Tape type output “H”: Metal Position
50
TYPE II
O
Tape type output “H”: High position
51
TYPE I
O
Tape type output “H”: Normal position
52
REC MUTE
O
Recording mute on/off control output “H”: Mute on
53
RELAY
O
Relay drive output “H”: On
54
NC
–
Not used (Open)
55
REC/PB
O
Mode control output to DOLBY NR amplifier (IC301) “L”: Record
56
PB MUTE
O
Playback mute on/off control output “H”: Mute on
57
SYS-VCC
I
Power supply for system
58
OPTION
O
Not used (Fixed at “L”)
59
NO-USE
–
Not used (Fixed at “L”)
60
POWER-OUT
O
Audio and mechanism power on/off output “H”: On
61
BIAS
O
Control output to recording bias switch (Q352) “L”: On
62
POW-IN
I
Primary power on/off input “H”: On
63
CLOSE SW
I
Close detection input from S901 “L”: Close
64
OPEN-SW
I
Open detection input from S902 “L”: Open
65
SOLENOIDE
O
Plunger (PMxxx) drive output “H”: On
66
LINE-MUTE
O
Line mute on/off control output “L”: Mute on
67
CHORM-SW
I
Tape type detection input from Sxxx “L”: Type I
68
METAL-SW
I
Tape type detection input from Sxxx “L”: Type IV
69
REC-REV-SW
I
Record proof detection input from Sxxx (REV side) “H”: Not nail
70
REC-FW-SW
I
Record proof detection input from Sxxx (FWD side) “H”: Not nail
71
CAPSTAN
O
Capstan/reel motor (M902) drive output “H”: On
72
CLOSE
O
Loading motor (M901) drive output *1
73
OPEN
O
Loading motor (M901) drive output *1
74
TEST
I
Test mode terminal
75
MODE-SW
I
Head sensor input from Sxxx
76
AD-VCC
I
Power supply for A/D converter
77
KEY 1
I
Key input (A/D convert input)*2
78
KEY 2
I
Key input (A/D convert input)*2
79
HALF-SW
I
Cassette half detection input from Sxxx
80
AMS-IN
I
AMS input
Pin No.
Pin Name
I/O
Function
*
1 Loading Motor (M901)
IN
OUT
BRAKE
CLOSE &™
H
L
H
OPEN &£
L
H
H
Voltage
Input port
0 V
0.45 V
1.19 V
2.19 V
3.2 V
3.98 V
4.48 V
5.0 V
Pin &•, KEY 2
Open/Close
STOP
PAUSE
FWD
REV
CD
—
Not key input
§
p
P
·
ª
SYNC
Pin &¶, KEY 1
POWER
REW
FF
REC
RESET
DIRECTION DOLBY NR Not key input
ON/OFF
0
)
r
*
2 Key Input
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