– 27 –
– 28 –
– 29 –
– 30 –
• Waveform
– MAIN BOARD –
1
IC3
&¢
(X OUT)
500 mV/DIV, 5 µs/DIV
1.3 Vp-p
75 kHz
• IC Block Diagrams
IC1
TA7371AF-EL
IC301
TA2123AF (EL)
IC2
TA2022AFN-EL
RF OUT
VCC
MIX OUT
7
6
OSC
RF IN
GND
DFC
DIODE (C)
AFC
DIODE (A)
5
8
1
2
3
4
RF
AMP
MIX
AMP
OSC
REGULATOR
AM IF
PILOT
AM
FM
OSC
FM
IF AMP
FM DET
AF AMP
SWITCH
ST
IND
AM DET
AGC
STOP
PULSE
MIX
AM
IF AMP
VREF
OSC
FM IF IN
MIX OUT
VCC
AM IF IN
QUAD
AGC
GND
IF OUT
IF REQ
SP OUT
AM RF IN
PW SW
DET OUT
PILOT IN
MPX IN
LPF 2B
LPF 2A
VCO
LPF1
ROUT
LOUT
ST IND
1
7
8
9
10
11
12
6
5
4
2
3
19
20
21
22
23
24
18
17
16
15 14
13
φ∠
0
°
VCO
φ∠
90
°
DIVIDE
PRE
DECODE
PRE A
PRE B
MIX
PW B
PW A
PW C
BST
MT TC
BASE
RF IN
PW GND
OUT B
OUT C
OUT A
VCC
RF OUT
VREF OUT
BST NF
BST OUT
PW IN C
LPF
EQ A
PW NF A
PW IN A
PW IN B
PW NF B
3
IN A-R
5
PRE NF-A
6
PRE OUT A
7
MTL DRV A
8
MTL DRV B
9
PRE OUT B
10
PRE NF-B
11
AMS IN
12
IN B-R
4
IN B-F
2
IN A-F
1
21
20
19
18
17
GND
16
AMS DET
15
AMS MIX
14
AMS SW
13
22
23
24
38
C-AMP SW 37
PW SW 42
MT SW 41
F/R SW 44
BST SW
43
M/N SW 46
PRE GND 47
VREF IN 48
PRE SW 45
AMS OUT 40
BEEP 39
26
27
28
29
30
31
32
33
34
DET
36
AGC IN
35
+
–
+
–
+
–
+
–
+
–
+
–
EQ B
25
RIPPLE
FILTER
AGC
DET
BEEP
VREF
SWITCH
COMPARATOR
MTL DRV
IC302
NJM2185AV-TE2
IC601
MM1279XVBE
8
9
10
14
13
12
2
1
3
A-CH BLOCK
11
7
6
5
4
G2
G1
V/I
WEIGHT
BIAS
CIRCUIT
+
–
+
–
GM
SUM
V+
SW
VEXT
OUT
A
DCA
DET
A
INA
GND
IREF
VREF
OUTB
DCB
DETB
INB
B-CH BLOCK: SAME AS A-CH.
V
1
PW
2
W
3
GND
4
OSC
5
DR
6
VREF
7
START
8
VSP
9
IN+ 10
PV
20
U
19
PU
18
GND
17
VCC
16
FC
15
TC1
14
TC2
13
R1
12
OUT
11
MOTIVE
CONTROL
CIRCUIT
MOTIVE/
OSC
MOTIVE
LOGIC
SOFT SWITCH
PRE DRIVER
INVERTER
BIAS
REFERENCE
VOLTAGE
SPEED
CONTROL
CURRENT
CONTROL
OUTPUT
BIAS
+
–
6-5.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC3 TC9327AF-606 (SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER)
Pin No.
Pin Name
I/O
Description
1 to 4
COM1 to COM4
O
Common drive signal output to the liquid crystal display (LCD1)
5 to 22
S1 to S18
O
Segment drive signal output to the liquid crystal display (LCD1)
23
DOLBY VCC
CTL
O
Power on/off control signal output of the dolby NR amp (IC302)
“L”: power on, “H”: power off
24
SPEED CTL
O
Motor speed control signal output to the capstan/reel motor driver IC (IC601)
“L”: normal speed, “H”: 1/2 speed
25
RADIO/MIC
O
Not used (open)
26
F/R CTL (REC)
O
Not used (open)
27
PRE CTL
O
Preamp on/off control signal output to the TA2123AF (IC301) “L”: tape play, “H”: radio on
28
MUTE CTL
O
Power on mute control signal output to the TA2123AF (IC301) “L”: mute on
29
F/R CTL (PLAY)
O
Forward/reverse selection signal output to the TA2123AF (IC301)
“L”: reverse direction, “H”: forward direction
30
BAND FM/AM
O
Power on/off control signal output of the FM circuit
“L”: power on (FM on), “H”: power off (AM or tape on)
31
R DATA OUT
O
Remote control data output to the remote commander
32
F TUME
I
“H” is input when amplifier on mode
33
R TUME
I
“H” is input when amplifier on mode
34
R DATA IN
I
Communication request input from the remote commander
35
HOLD SENS
I
Hold status input of the HOLD switch (S2) “L”: hold off, “H”: hold on
“H” is input when key pressing at hold mode
36
OSC CTL
O
Motor restart control signal output to the capstan/reel motor driver IC (IC601)
“L”: BL skip status, “H”: FF/REW motor rotation status
37
AMS IN
I
Whether a music is present or not from TA2123AF (IC301) is detected at auto music sensor
“L”: music is present, “H”: music is not present
38
PHOTO CTL
O
Control signal output to the capstan/reel motor rotation detect circuit
“L”: rotation detect circuit on
39
PHOTO IN
I
Rotation detect signal input of the capstan/reel motor (M601)
40
DDC1 CTL
O
Power on/off control signal output of the DC/DC converter circuit
“L”: power off, “H”: power on
41
HOLD SW
I
Hold detect input from the HOLD switch (S2) “L”: hold on
42
BATT DET
I
Battery voltage detection signal input (A/D input)
43
KEY IN
I
Key input terminal (A/D input)
44
F/R SW
I
Tape direction switch (S1) input terminal (A/D input) “L”: forward position
45
A/D REF
I
Reference voltage (+1.6V) input for the A/D converter
46
CS
O
Chip select signal output to the EEPROM (IC4)
47
M DATA I/O
I/O
Two-way data bus with the EEPROM (IC4)
48
M CLOCK
O
Serial clock signal output to the EEPROM (IC4)
49
BEEP
O
Beep sound signal output to the TA2123AF (IC301)
50
MOTOR CTL
O
Motor start control signal output to the capstan/reel motor driver IC (IC601)
“L”: motor off, “H”: motor on
51
MOTOR DIR
O
Motor direction control signal output to the capstan/reel motor driver IC (IC601)
“L”: clockwise, “H”: counterclockwise
52
TAPE
I
Cassette tape detect switch (S901-1) input terminal “L”: cassette detected, “H”: no cassette
53
REC CTL
O
Not used (open)
54
AVLS CTL
O
AVLS (Automatic Volume Limiter System) on/off control signal output terminal
“L”: AVLS on “H”: AVLS off
Содержание WM-FX673
Страница 5: ... 5 SECTION 2 GENERAL This section is extracted from instruction manual FX673 FX877 FX673 FX877 ...
Страница 6: ... 6 FX673 FX877 FX673 FX877 FX673 FX877 ...
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Страница 16: ...WM FX673 FX877 23 24 25 26 6 4 SCHEMATIC DIAGRAM See page 27 for Waveform See page 28 for IC Block Diagrams ...