Sony STR-DB725 User manual

– 1 –
MICROFILM
AEP Model
UK Model
SPECIFICATIONS
SERVICE MANUAL
FM STEREO/FM-AM RECEIVER
STR-DB725/DB825
— Continued on next page —
Photo: STR-DB825

– 13 – – 14 –
STR-DB725/DB825
3-3. SCHEMATIC DIAGRAM – VIDEO INPUT SECTION –
• See page 43 for IC Block Diagrams.
(Page 21)
(Page 32)
(Page 17)
(Page 21)

– 17 – – 18 –
STR-DB725/DB825
3-5. SCHEMATIC DIAGRAM – INPUT SECTION –
• See page 43 for IC Block Diagrams.
(Page 32)
(Page
14)
(Page
37) (Page 31, 32) (Page 33)
(Page
26)
(Page
25)
(Page
37)
(Page 22)
(Page 22)
(Page 21,
22)

– 21 – – 22 –
STR-DB725/DB825
3-7. SCHEMATIC DIAGRAM – S-VIDEO SECTION –
• See page 43 for IC Block Diagrams.
(Page 14) (Page 14) (Page 18) (Page 18)
(Page 18)

– 25 – – 26 –
3-9. SCHEMATIC DIAGRAM – SPEAKER SECTION –
• See page 43 for IC Block Diagrams.
STR-DB725/DB825
(Page 38)
(Page 37)
(Page 37)
(Page 31)
(Page 41)
(Page 38)
(Page 31)
(Page 18)
(Page 18)

– 31 – – 32 –
3-12. SCHEMATIC DIAGRAM – DISPLAY SECTION –
• See page 11 forWaveforms.
• See page 46 for IC Pin Function.
STR-DB725/DB825
(Page
34)
(Page
26)
(Page
38)
(Page
26)
(Page 17,18) (Page 14) (Page 17)
(Page
34)
(Page
34)
(Page
33)

– 33 – – 34 –
3-13. SCHEMATIC DIAGRAM – FRONT PANEL SECTION –
STR-DB725/DB825
(Page 32)
(Page 32)
(Page 32) (Page 31)
(Page 18)

– 37 – – 38 –
3-15. SCHEMATIC DIAGRAM – POWER AMP SECTION –
STR-DB725/DB825
(Page 25)
(Page 41)
(Page 41)
(Page 26)
(Page 31)
(Page 25)
(Page 17)
(Page
18)
(Page 25)

– 41 –
3-17. SCHEMATIC DIAGRAM – TRANS SECTION –
STR-DB725/DB825
(Page 38)
(Page 38)
(Page 26)

– 43 –
3-19. IC BLOCK DIAGRAMS
IC001, 601, 701 uPC2581V
PROTECTOR
DRIVE
12 3 4 5 6 7 8 9 10 11 12 13 14 15
PRE
DRIVE
PRE
DRIVE
BIAS CIRCUIT
REG DRIVE
MUTE
+VOUT1 –VOUT1
COMP1
NF1
IN1
GND
IN2
NF2
COMP2
–VOUT2 +VOUT2
VCC1 VCC2
VEE
IC106 BA6208
1 2 3 4 5 6 7 89
NC
OUTPUT 2
Vcc
GND
NC
INPUT 2
INPUT 1
NC
MOTOR
DRIVE
MOTOR
DRIVE
REG
SWITCH
SWITCH
OUTPUT1
IC251 NJM2296D
9
S5
S6 S7
S4
S1 S2
S3
Vout1
Vout2 Vout3
V-
GND
SW3
SW2SW1
SW5 SW4
Vin1 Vin2
Vin3Vin4Vin5
V+
10111213141516
1 52 3 4 6 7 8
IC302 LC7822
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
CONTROL
LATCH
SHIFT RESISTOR
LEVEL SHIFT
CL
DI
CE
VEE
OUT
IN
OUT
IN
OUT
IN
VSS
S
RESET
VDD
OUT
IN
IN
OUT
IN
OUT
IN