12
12
WM-EX422
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 speci-
fied.
•
C
: panel designation.
•
: 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 : PLAY
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.
• Circled numbers refer to waveforms.
• Signal path
.
E
: PB
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.
z
Waveforms
1
IC701
9
VOLT/DIV : 1V AC
TIME/DIV : 20msec
PHOTO CTRL
1.0 Vp-p
125msec
2
IC701
wl
XT1
VOLT/DIV : 0.5V AC
TIME/DIV : 10
µ
sec
1.3Vp-p
32.768 kHz
5-4. IC BLOCK DIAGRAMS
IC301 TA2160FN (EL)
12
13
14
19
15
8
9
10
PRE OUT B
BST SW
PW INA
PW NFB
PW INB
PW MUTE
PRE MUTE
AGC DET
PW GND
PW NFA
1
4
2
3
5
6
PRE NFB
PRE NFA
PRE OUT A
VREF
PRE GND
7
RF & REF
BST SW
AGC DET
AGC
18
17
16
20
LPF
VREF IN
BSF NF
IN B
IN A
RF IN
BASE
BST OUT
PW INC
AGC IN
OUT A
OUT C
OUT B
VCC
RF OUT
30
29
27
28
23
24
25
26
22
21
11
PRE B
PRE A
BST
PW A
PW B
PW C
IC601 MM1279XVBE
+
11
13
14
15
16
17
18
20
1
2
3
4
5
6
7
8
9
10
19
12
PRE
DRIVER
SOFT
SWITCH
MOTIVE
LOGIC
MOTIVE
/OSC
BIAS
REFERENCE
VOLTAGE
MOTIVE
CONTROL
CIRCUIT
INVERTER
SPEED
CONTROL
CURRENT
CONTROL
OUTPUT
BIAS
PV
V
PW
W
GND
OSC
DR
VREF
START
VSP
IN+
U
PU
GND
VCC
FC
TC1
TC2
R1
OUT
