Ic Block Diagrams - Sony WM-EX422 Service Manual

WM-EX422
Note on Schematic Diagram
• All capacitors are in µF unless otherwise noted. pF: µµF 50
WV or less are not indicated except for electrolytics and
tantalums.
• All resistors are in Ω and 1 / W or less unless otherwise speci-
4
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 MΩ).
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.
•
: Through hole.
a
• : 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.
Waveforms
z
1
1.0 Vp-p
125msec
IC701 9
VOLT/DIV : 1V AC
PHOTO CTRL
TIME/DIV : 20msec
2
1.3Vp-p
32.768 kHz
IC701 wl
VOLT/DIV : 0.5V AC
XT1
TIME/DIV : 10 µsec
12

5-4. IC BLOCK DIAGRAMS

IC301 TA2160FN (EL)
30 29 28 27 26 25 24 23
RF & REF
PW A
PRE A
PRE B
BST SW
1 2 3 4 5 6 7
IC601 MM1279XVBE
V
1
PW 2
MOTIVE
W 3 CONTROL
CIRCUIT
GND 4
MOTIVE
MOTIVE
LOGIC
OSC 5
/OSC
DR 6
INVERTER
BIAS
VREF
7
SPEED
REFERENCE
CONTROL
VOLTAGE
START 8
VSP 9
+
IN+ 10
12
19
22 21 20 18 17 16
PW C
BST AGC DET
PW B
AGC
11 13 14
8 9 10 12 15
20 PV
19 U
PRE
DRIVER
18 PU
GND
17
16 VCC
FC
15
SOFT
14 TC1
SWITCH
13 TC2
CURRENT
CONTROL
OUTPUT 12 R1
BIAS
11 OUT