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STR-DB725/DB825
SERVICE MANUAL
AEP Model UK Model
Photo: STR-DB825
SPECIFICATIONS
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FM STEREO/FM-AM RECEIVER
MICROFILM
1
STR-DB725/DB825
3-3. SCHEMATIC DIAGRAM VIDEO INPUT SECTION · See page 43 for IC Block Diagrams.
(Page 21)
(Page 32)
(Page 21)
(Page 17)
13
14
STR-DB725/DB825
3-5. SCHEMATIC DIAGRAM INPUT SECTION · See page 43 for IC Block Diagrams.
(Page 22)
(Page 21, 22)
(Page 22)
(Page 37)
(Page 25)
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18
STR-DB725/DB825
3-7. SCHEMATIC DIAGRAM S-VIDEO SECTION · See page 43 for IC Block Diagrams.
(Page 18)
(Page 14)
(Page 14)
(Page 18)
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STR-DB725/DB825
3-9. SCHEMATIC DIAGRAM SPEAKER SECTION · See page 43 for IC Block Diagrams.
(Page 18)
(Page 31) (Page 38)
(Page 38)
(Page 18) (Page 41) (Page 31) (Page 37)
(Page 37)
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26
STR-DB725/DB825
3-12. SCHEMATIC DIAGRAM DISPLAY SECTION · See page 11 for Waveforms. · See page 46 for IC Pin Function.
(Page 33)
(Page 34) (Page 34) (Page 34)
(Page 26)
(Page 38)
(Page 26)
(Page 17,18)
(Page 14)
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32
STR-DB725/DB825
3-13. SCHEMATIC DIAGRAM FRONT PANEL SECTION
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(Page 32)
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34
STR-DB725/DB825
3-15. SCHEMATIC DIAGRAM POWER AMP SECTION
(Page 25)
(Page 18)
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37
38
STR-DB725/DB825
3-17. SCHEMATIC DIAGRAM TRANS SECTION
(Page 38)
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41
3-19. IC BLOCK DIAGRAMS
IC001, 601, 701 uPC2581V
BIAS CIRCUIT PROTECTOR
REG 1 MUTE
DRIVE 2 +VOUT1 3 VOUT1 4 COMP1
PRE DRIVE 5 NF1 6 IN1 7 GND
PRE DRIVE 8 IN2 9 NF2 10 COMP2
DRIVE 11 VOUT2 12 +VOUT2 13 VCC1 14 VCC2 IN 15 VEE
9 NC
IC106 BA6208
SWITCH
MOTOR DRIVE
SWITCH
MOTOR DRIVE REG
1 NC
2 INPUT 1
3 INPUT 2
4 NC
5 GND
6 Vcc
7 OUTPUT 2
8 OUTPUT1
IC251 NJM2296D
16 V+ Vout2 15 SW1 14 Vin1 13 12 GND Vout3 11 SW2 10 Vin2 9
S6 S1 S4 S5
S7 S2
S3
1 Vout1
2 SW5
3 Vin5
4 SW3
5 Vin4
6 SW4
7 Vin3
V8
IC302 LC7822
1 IN 2 3 OUT 4 5 IN 6 7 OUT 8 9 IN 10 OUT VEE 11 12 LEVEL SHIFT
30 29 IN 28 27 OUT 26 25 IN 24 23 OUT 22 21 20 OUT 19 VDD
DI
CONTROL
CE 13 14
LATCH
18 RESET 17 S
CL 15
SHIFT RESISTOR
16 VSS
43
36
35
34 33
32 VDD
31
30
29
28
27
26 AGND
25
24
23
22
21
20
OSC PDM-COUT
PDM SRA1-8K R+DELAY P B INV-PHASE
R
B L-R 20KH-L.P.F. 20K DEC 20K 20K 20K R B L+R -6dB R B B-NR R-STEREO P B 5K/7K-L.P.F.
L+DELAY VOL/MUTE
RS-TRIM
LS-TRIM VREF 14
VSS 1
2 CLK
3 DATA
4 ENABLE
5
6
7 DC-LS
8
9 DC-IN
VCC 10
11 L-IN
12 R-IN
13 S-IN
15 FCL-IN
16 FCR-IN
17 18 FCLS-IN FCRS-IN
DCUT L-R-RCT L+R-RCT
IC401 CXA8079S
CT-OUT2 CM-CAP MIXOUT FCC-IN2 ENABLE R-BPF1 R-BPF2 R-BPF3 CT-IN2 R-OUT S-OUT C-OUT L-OUT DCUT OSC1 DATA CLK
VCS-TH
RS-OUT 19 VCS1
LS-OUT
DC-RS
R-OUT
DC-OT
IC400 CXA8081S
L-OUT
NR-R
NR-C
48
47 46 45
44 43
42 VCC
41
40
39
38
37
36
35
34
33
32
31
30 29 28
27
26
OSC
DEC B N-GEN N-BPF N-OH DIV BAL-DET BALCONT R COMB-NET B R B VR VREF VR VCRX8 L-B.P.F. L-RECT VLR-LOG P.S CMODE SMUTE R-RECT B P B P B P P L-R-RECT DUAL-TIME C-TRIM
R-B.P.F.
L+R-RECT
VCS-LOG
P.S
1
NS-BPF1
2
NS-BPF2
3
VREF
4
S-DCUT
5
C-DCUT
6
L-DCUT
7
R-DCUT
8
VREF-BUF
9
L-IN
10
R-IN
GND 11
12
CT-OUT1
13
CT-IN1
14
FCC-IN1
15
L-BRF1
16
L-BRF2
17
L-BRF3
18
DCUT
19 20 21
DCUT R-RCT
22
VCR-TH
23
VCR1
IC403 LC7823
L1 1 30 R1 29 R2 28 R COM1 27 R3 26 R4 25 R COM2 24 R5 23 R6 22 R COM3 21 R7 LEVEL SHIFT 20 R COM4 19 VDD
L2 2 L COM1 3 L3 4 L4 L COM2 L5 5 6 7
L6 8 L COM3 9
L7 10 L COM4 11 VEE 12
CONTROL
CE 13 D1 14 CL 15
LATCH
18 RES 17 S
SHIFT RESISTOR
16 VSS
44
VCR2
VCS2
25
24
IC452 BU1922
TSTLD 9 8 SCOUT OSCO RDCL VDDD TEST 10 ANTIALIASING FILTER CLOCKED COMPARATOR VP1 REFERENCE VOLTAGE 7 CIN OSCI VSSD 11 TS7 15
16
14
13
12
TEST LOGIC AND OUTPUT SELECTOR SWITCH QUALITY BIT GENERATOR OSCILLATOR AND DIVIDER 57kHz BANDPASS (8th ORDER)
RECONSTRUCTION FILTER
DEFFERENTIAL DECODER
BIPHASE SYMBOL DECODER
CONTAS LOOP VARIABLE AND FIXED DIVIDER
CLOCK REGENERATION AND SYNC
1 QUAL
2 RDDA
3 Vref
4 MUX
5 VDDA
6 VSSA S. DATA 9 CR 1
IC502 TC9184P
TREBLE TREBLE +
IC901 NJM2103D
BASS +
BASS
COM
16
15
14
13
12
11
10 TONE CE
T. LAT
+9V
8
RESET
VSC 2 + VREF
+ 7 VSA
OUTC
3
6
VSB/SESIN
1 9V
2 BASS +
3 BASS
4 COM
5 TREBLE
6 TREBLE +
7 GND
8 S. CLK GND 4 Q R S + + 5 V+
45