SONY ICDB7
Service Manual

ICD-B7

THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.) Common Note on Schematic Diagrams: � 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 � and 1/4 W or less unless otherwise specified. f : internal component. C : panel designation. A : B+ Line. Power voltage is dc 3V and fed with regulated dc power supply from battery terminal.

� Waveforms

3-7. IC BLOCK DIAGRAMS

1

0.5V/div 0.1µsec/div

1.0Vp-p 4.02MHz

IC103 LM4890MMX

IC101 ta (XOUT)

� � � � �

2

1.0V/div 10µsec/div
SHUTDOWN 1 BIAS 8 VO2 7 GND 6 VDD +IN 3 -IN 4 5 VO1

2.2Vp-p 32.768kHz

BYPASS 2

IC704 1 (32KOUT)

� Voltage and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : PB ( ) : REC � Voltages are taken with a VOM (Input impedance 10 M�). 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 a : REC

3

0.5V/div 10µsec/div

1.2Vp-p 32.768kHz

IC704 8 (OSCOUT)

4

1.0V/div 0.2µsec/div 3.2Vp-p 5MHz

IC704 RS5C348A-E2

IC703

ul (X2)

Common Note on Printed Wiring Boards: � X : parts extracted from the component side. � Y : parts extracted from the conductor side. � �
f

32KOUT

1

32 kHz OUTPUT CONTROL

: internal component. : Pattern from the side which enables seeing.

COMPARATOR W COMPARATOR

ALARM W REGISTER (WEEK, MIN, HOUR) ALARM D REGISTER (MIN, HOUR)

VDD

Caution: Pattern face side: (SIDE B) Parts face side: (SIDE A) � Lead Layouts

D

10 VDD

Parts on the pattern face side seen from the pattern face are indicated. Parts on the parts face side seen from the parts face are indicated.
SCLK 2 ADDRESS REGISTER SO 3 I/O CONTROL SI 4 SHIFT REGISTER

TIMER COUNTER SEC, MIN, HOUR, WEEK, DAY, MONTH, YEAR

DIV

DIVIDER CORRECTION

9 OSC 8

OSCIN OSCOUT

ADDRESS DECODER

INTERRUPT CONTROL OSC DETECT

Lead layout of conventional IC
VSS 5 VOLTAGE DETECT

7 6

CE INTR

14

14