Block Diagram - System Control Section - Sony MZ-R55 Service Manual

MZ-R55
6-4. BLOCK DIAGRAM — SYSTEM CONTROL SECTION —
AUDIO
B
KEYRMC
SECTION
(Page 27)
LCD
MODULE
WITH
SWITCH
UNIT
POWER
RVCC
SWITCH
(+2.8V)
Q801
S807 S809
SYNCHRO DIGITAL
S806
MEGA BASS
REC
HOLD
OFF OFF
HOLD ON
S802
OPEN
S803
RVCC
CLOCK
S804
(+2.8V)
SET
T MARK
S801
DOOR
OPEN
RESET
3
IC804
TEMP
METER 4
IC803
04
– 29 –
DC/DC CONVERTER
SYSTEM CONTROL IC903
IC802 ( 3/3 )
RVCC
PWM
3
(+2.8V)
COMP
13 WP XPCONT1 30 4
45 LCD SCK
DC/DC CONVERTER
44
LCD DATA
IC902
42 LCD STB
PWM
3
COMP
57 KEY1
56 KEY2
55 KEY3 X2V CONT 31 4
DC/DC CONVERTER
32 XREC LED
IC806
PWM
2
36 XLCD ON
COMP
21 HOLD
22 SYNC REC 3
23 DBB
S808
25 AVLS
AVLS
NORM S901
XNIMH DET 92
(BATTERY IN)
LIMIT
GND SW 100
14 OPEN
15 CLOCK
18 TMARK
S805
19 REC
REC
NIMH CHG 35
38 MRST
41 EXTAL
X801
CHG CONT 73 5 7
CHARGE
12MHz
40 XTAL
CONTROL
CHG MNT 46 1 IC901 2
54 TEMP
3V
ON/OFF
2.7V REG
5 DRIVE 2.7V
Q908, 909
Q904 ( 1/2 )
RV901
1
2.65V
3V
ON/OFF
2V REG
5
DRIVE 2V
Q907, 909
Q904 ( 2/2 )
1
3V 3V
D802
ON/OFF
2.8V REG RVCC
3 2
DRIVE
IC807 (+2.8V)
Q802
RECHAGEABLE
BATTERY
NH-14WM
1.2V 1400mAh
3V
Q906
FILTER
LF901
Q903
3V
Q901
CHARGE
CONTROL
Q902
– 30 –
(CHARGE)
J901
DC IN 3V