Read Sony MDX-C7890R (serv.man2) Service Manual online
– 9 –
– 10 –
MDX-C7890R
– BUS CONTROL/POWER SUPPLY Section –
BACKUP +5V
BACKUP +5V
RESET SIGNAL
GENERATOR
IC801
RAM RESET
IC802
BATTERY
DETECT
Q601
ACCESSORY
CHECK
Q900
LEVEL SHIFT
Q603
S900
(RESET)
6
8
4
CLK
AMT+B
FM8V
VCC
ANP+B
REGULATOR
IC800
COM8V
BU+B
AM8V
MODE1
MODE2
STB
CLK IN
DATA OUT
DATA
2
RST
RESET
SWITCH
BUS ON
SWITCH
13
11
1
BUS ON
OUT
OUT
BUS
ON IN
12
9
DATA IN
SONY BUS INTERFACE
IC600
MASTER CONTROLLER
IC700 (3/3)
MD MECHANISM CONTROLLER
IC501 (2/2)
BUS ON SWITCH
Q600
BATT
BATT B+
BUS ON
DATA
CLK
RESET
CNJ600
7
6
5
4
2
16
BATT
ANT REM
AMP REM
6
5
BUS CONTROL IN
(FOR SONY BUS)
CNP500 (2/2)
S700
(POWER SELECT)
REGULATOR
CONTROL SWITCH
Q255
REGULATOR
CONTROL SWITCH
Q253
REGULATOR
CONTROL SWITCH
Q906
B+ SWITCH
Q402, 403
DC/DC
CONVERTER
IC250
+12V
REGULATOR
Q254
+5V
REGULATOR
Q252
+10V
REGULATOR
Q903, 904
BACK LIGHT
LAMP DRIVE
Q805, 807
F1
Q251
+5V
REGULATOR
IC900
COM +8V
(ELECTRICAL VOLUME (IC300) B+)
05
RST
3
BATT
BATTERY
SWITCH
10
7
BU IN
UNISI
50 UNISO
UNICKI
MDMON 10
76
36
22 UNI CKO
20 UNI SI
21 UNI SO
RAMBU
29
102
90
65
MD-ON
D702
TH600
D604
D603
D913
+3.3V
REGULATOR
IC401, Q401
B+
SWITCH
Q250
VCC
LCD +10V
(LCD DRIVER (IC801) B+)
D/A +5V
PL801, 802
(FOR BACK LIGHT)
AM B+
(AM CIRCUIT B+)
FM B+
(FM CIRCUIT B+)
7
ACC
+9V
REGULATOR
Q2
+9V
(FOR VT)
+5V
REGULATOR
Q6
+5V
(FM/AM PLL (IC100) B+)
BATT
(POWER AMP (IC500) B+)
+3.3V
DRIVER +5V
LOAD +12V
D803
D701
BACKUP +5V
PULLUP +5V
(Type A)
(Type B)
2
3
4
5
9
10
11
8
6
PW ON 109
PW SEL
ON
OFF
FM ON 110
TUN ON
LAMP ON (ILL ON)
111
64
108
RESET
SYSRET
BU-IN
BUS-ON
RESET
LINKOFF
ACC IN
BU IN
BUS-ON
48
61
60
30
49
46
95
D
(Page 8)
DIMMER
MOTOR/COIL DRIVER
(IC303) B+
LOADING MOTOR
DRIVER (IC305) B+
