9
9
WM-FX488
Pin No.
Pin name
I/O
Description
SECTION 4
DIAGRAMS
4-1. EXPLANATION OF IC TERMINALS
IC701 TC9329FA-CFX1740 (SYSTEM CONTROL)
1 to 4
COM 1 to 4
O
LCD common drive
5 to 19
S 1 to 15
O
LCD segment drive
20
S0
O
Not used (OPEN)
21 to 22
K01 to 02
O
Key output
23 to 26
K 1 to 4
I
Key input
27
VDD
–
Power supply
28
BEEP
O
Beep signal output
29
FWD/REV CTL
O
FWD/REV head selection output
30
BAND1
O
Tuner mode selection output
31
BAND2
O
Tuner mode selection output
32
AMP CTL
O
Amplifier B+ switch ON/OFF control signal output
33
NC
–
Not used (OPEN)
34
BATT CHECK
I
Battery voltage check terminal
35
IF IN 1
I
Tuner IF frequency input
36
HOLD SW
I
Hold switch input
37
GND
–
Ground
38
OSC IN
I
Tuner OSC frequency input
39
VDD
–
Power supply terminal
40
DO (OT)
O
Tunning data output
41
VREG
–
Capacitor connection terminal
42
IF REQ
O
IF request output for tuner
43
TAPE
I
Tape power switch input
44
RADIO ON
O
Tuner ON/OFF output
45
LOCAL/DX,
O
Tuner sensitivity/tape type selection output
STEREO/MONO
46
FWD/REV SW
I
FWD/REV switch input
47
P-CTL
O
Power switch ON/OFF output
48
MODEL1
I
Distination select terminal
49
MODEL2
I
Distination select terminal
50
PRE CTL
O
PRE mute output
51
MUTE CTL
O
PRE mute signal output
52
MB CTL
O
Megabass control signal output
53
AVLS CTL
O
AVSL control signal output
54
RESET
I
Reset signal input
55
X-OUT
O
System clock output (75kHz)
56
X-IN
I
System clock input (75kHz)
57
GND
–
Ground terminal
58
VDB
–
Capacitor conection terminal
59
C1
–
Capacitor conection terminal
60
C2
–
Capacitor conection terminal
61
VEE
–
Capacitor conection terminal
62
C3
–
Capacitor conection terminal
63
C4
–
Capacitor conection terminal
64
VLCD
–
Capacitor conection terminal
Note on Schematic Diagram
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F 50 WV or
less are not indicated except for electrolytics and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise specified.
•
f
: internal component.
•
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 1.5V and fed with regulated dc power supply
from battery terminal.
• Voltages and waveforms are dc with respect to ground under no-
signal (detuned) conditions.
• no mark : FM (RADIO SECTION), PLAY (TAPE SECTION)
(
) : AM
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production toler-
ances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production toler-
ances.
• Circled numbers refer to waveforms.
• Signal path
.
F
: FM
f
: AM
E
: PB
• Abbreviation
CH
: Chinese
E
: No indication of country of origin
6E
: Indication of country of origin
Note on Printed Wiring Board
•
X
: parts extracted from the component side.
•
a
: Through hole.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Parts on the pattern face side seen from the
(Side B)
pattern face are indicated.
Parts face side:
Parts on the parts face side seen from the
(Side A)
parts face are indicated.
• Abbreviation
CH
: Chinese
E
: No indication of country of origin
6E
: Indication of country of origin
z
Waveforms
1
IC701
tg
VOLT/DIV : 1V AC
TIME/DIV : 5
µ
sec
X-OUT
2.9 Vp-p
75 kHz
2
Q401
C
VOLT/DIV : 5V AC
TIME/DIV : 0.2
µ
sec
16 Vp-p
0.4
µ
sec
Ver 1.1 2003.01
