Sony ZS-RS70BT Service Manual page 53

IC401 BU4053BCF-E2
Y1 1
Y0 2
Z1 3
Z 4
Z0 5
BINARY TO 1 OF 2 DECODER
WITH INHIBIT
INHIBIT 6
VEE 7
LEVEL
CONVERTER
VSS 8
IC904 S-T111B33MC-OGSTFG
ON/OFF
1
ON/OFF
CIRCUIT
VSS 2
NC 3
– KEY A Board –
IC601 HT1621
44 43 42 41
CS 1
CONTROL
RD 2
AND
TIMING
WR 3
SCIRCUIT
DATA 4
VSS 5
VLCD 6
VDD 7
TONE WATCHDOG TIMER
BZ 8 FREQUENCY
GENERATOR TIME BASE GENERATOR
COM0 9
COM1 10
COM2 11
12 13 14 15 16 17 18 19 20 21 22
16
15
14 X
13
12 X0
11
10 B
9
5
4
OVER CURRENT
PROTECTOR
REFERENCE
VOLTAGE CIRCUIT
40 39 38 37 36 35 34
DISPLAY
RAM
32
LCD DRIVER/
BASE CIRCUIT
33 SEG11
4
32 SEG12
31 SEG13
30 SEG14
29 SEG15
28 SEG16
27 SEG17
AND
26 SEG18
25 SEG19
23 SEG20
24 SEG21
IC901 NJW4152GM1-A (TE2)
PV+ 1
VDD
Y
OCP
PULSE BY PULSE
X1
V+ 2 REGULATOR
ON/OFF 3
A
RT 4
C
VIN
VOUT
ZS-RS70BT/RS70BTB
BUFFER
PWM
UVLO
OSC
STANDBY
ON/OFF
ER.AMP
SOFT
START
VREF
8 SW
TSD 7 GND
6 FB
LOW
FREQUENCY
CONTROL
5 IN–
53