Sony DSR-250 Service Manual page 84

3-7. POWER BLOCK DIAGRAM (2/4)
VI-156 BOARD(1/3)
Q3352
POWER CONT
1
LIGHT CONT
2
HI UNREG
3
UNREG +12V
4
TO
+8.4V 1
POWER
5
BLOCK
+8.4V 2
(1/4)
6
+8.4V 3
(SEE
7
PAGE
+8.4V 4
8
3-12)
+8.4V 5
9
CN022
T3300
4
1
Q3305
SWITCHING
16
( ) : Page No. shown in ( ) indicates the page to refer on the schematic diagram.
AU VCC
TO
POWER BLOCK(4/4)
8.4V
(SEE PAGE 3-17)
UNREG 12V
Q3353
RIPPLE
FILTER
HI UNREG
IC3300
Q3306,
3307
D3308
DC/DC CONVERTER
EMERGENCY
DETECT
5 55
VCC(0)1234
D3306
2
VCC(0)5678
RECT
28 VCC
7
46
VSS(0)1234
8 57 VSS(0)567
D3307
RECT
49
VDD(0)123
2 60
VDD(0)567
D3305
RECT
3
8 +IN8
7
-IN8
3 OUT8
VREF 27
VREF
33
VB
34 RT
35
CT
VTR DD ON
29
CTL1-6,8
30
CTL7
3-13
Q3312
(4-59)
SWITCHING
L3303
Q3321
64
OUT7-1
SWITCHING
1
OUT7-2
13
-IN7
Q3313
SWITCHING
L3304
OUT3-1 53
Q3322
SWITCHING
54
OUT3-2
40
-IN3
Q3314
SWITCHING
L3305
OUT2-1 50
L3309
Q3323
OUT2-2 51
SWITCHING
43
-IN2
T3301
D3311
RECT
5
Q3308
D3312
SWITCHING
RECT
4 6
D3309
RECT
7
OUT4 56 1
-IN4 37
8
2
D3310
RECT
11
COMP
3
Q3309
SWITCHING L3302
L3316
L3311
L3313
Q3318
OUT1-1 47
SWITCHING
L3310
48
OUT1-2
44
-IN1
Q3315-3317,3324
MT 5.2V
5.2V
REG
TRF 2.8V
L3307
MS 3.1V
L3306
D 3.1V
L3308
D 1.9V
Q3340,3341
L3319
D 1.5V
1.5V REG
IC3301
AMP
IC3301
(4-62)
L3312
D 2.8V
L3314
AU 2.8V
L3315
A 2.8V
PANEL 2.8V
Q3325
EMERGENCY
DETECT
Q3327,3331,3332,3337
L3318
PANEL 13.5V
13.5V REG
Q3344,3345,3348,3349,3351
CAM 12V
12V REG
Q3333-3335,3338
CAM -7V
-7V REG
PANEL 4.6V
A 4.6V
RP 4.6V
AU 4.6V
AU 8.0V
8V REG
Q3326,3328,3336
3-14
DSR-250/250P
SHOE ON
VTR DD ON
CAM DD ON
HI UNREG
MT 5.2V
VTR UNREG
PANEL 2.8V
PANEL 13.5V
PANEL 4.6V
AU VCC
AU 4.6V
D 1.9V
A 2.8V
AU 2.8V
TO
D 2.8V
POWER
BLOCK
(3/4)
D 1.5V
(SEE
PAGE
3-15)
AU 8.0V
D 3.1V
A 4.6V
RP 4.6V
TRF 2.8V
CAM 12V
CAM -7V
MS 3.1V