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STR-SE381
SERVICE MANUAL
US Model
Manufactured under license from Dolby Laboratories Licensing Corporation. "Dolby" "Pro Logic" and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation.
SPECIFICATIONS
Audio power specifications POWER OUTPUT AND TOTAL HARMONIC DISTORTION With 8-ohm load, both channels driven, from 40 - 20,000 Hz, rated 60 watts per channel minimum RMS power, with no more than 0.5% total harmonic distortion from 250 milliwatts to rated output. Amplifier section
Stereo mode (8 ohms at 40 Hz - 20 kHz less than 0.5% total harmonic distortion) 60 W + 60 W (8 ohms at 1 kHz, THD 0.5%) Front: 60 W/ch Center: (Pro Logic Mode) 60 W Rear: 60 W/ch PHONO: RIAA equalization curve ±0.5 dB TV/DBS, CD, TAPE/MD, VIDEO INPUT 10 Hz - 50 kHz ±1 dB S/N (weighting network, Sensitivity PHONO (MM) CD TAPE/MD, TV/DBS, VIDEO 400 mV 250 mV 50 Kilohms 82 dB* (A, 150 mV) *78 IHF Impedance input level) 72 dB* (A, 2.5 mV) Outputs TAPE/MD REC OUT: Voltage: 150 mV, Impedance: 10 kilohms VIDEO AUDIO OUT: Voltage: 150 mV, Impedance: 10 kilohms PHONES: Accepts low and high impedance headphones Full mute +10 dB at 70 Hz ±8 dB at 100 Hz and 10 kHz
Muting BASS BOOST TONE
FM tuner section
Tuning range Antenna terminals Sensitivity Usable sensitivity S/N Harmonic distortion at 1 kHz Mono: 0.3% Stereo: 0.59% 45 dB at 1 kHz 30 Hz - 15 kHz +0.5 dB 2 60 dB at 400 kHz 87.5 - 108.0 MHz 75 ohms, unbalanced 300 ohms, balanced Mono: 18.3 dBf, 4.5 µV Stereo: 38.3 dBf, 45 µV 11.2 dBf, 2 µV (IHF) Mono: 76 dB Stereo: 70 dB
Surround mode
Frequency response
Inputs Separation Frequency response Selectivity
2.5 mV
50 Kilohms
AM tuner section
Tuning range Antenna Usable sensitivity S/N Harmonic distortion Selectivity 531 - 1710 kHz Loop antenna 50 dB/m (at 1,000 kHz) 54 dB (at 50 mV/m) 0.5% (50 mV/m, 400 kHz) At 10 kHz: 40 dB
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FM STEREO/FM-AM RECEIVER
MICROFILM
STR-SE381
3-3. SCHEMATIC DIAGRAM -- DISPLAY SECTION --
· See page 6 for Waveforms. · See page 25 for IC Pin Functions. · See page 27 for IC Block Diagrams.
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-- 10 --
STR-SE381
3-5. SCHEMATIC DIAGRAM -- VOLUME SECTION --
· See page 7 for KEY Board Wiring Board.
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-- 14 --
STR-SE381
3-7. SCHEMATIC DIAGRAM -- MAIN (1/3) SECTION --
· See page 27 for IC Block Diagrams.
-- 17 --
-- 18 --
STR-SE381
3-9. SCHEMATIC DIAGRAM -- MAIN (2/3), POWER SECTION --
· See page 27 for IC Block Diagrams.
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-- 22 --
STR-SE381
3-10. SCHEMATIC DIAGRAM -- MAIN (3/3), SP SW SECTION --
· See page 12 for SW Board Wiring Board. · See page 27 for IC Block Diagrams.
-- 23 --
-- 24 --
IC301
BPF1 BPF2 CLK
1 2 1
CONTROL NOISE GENERATOR DATA ENABLE 42 41 40
NOISE FILTER
NOISE CH
LPF
IC300
D.GND 2 CLK A B 3 DEC DATA 4 ENABLE 5 IN-FILTER (40kHz) NR-DET 6 VDD
24
OSC
LA2786
VREF DIVIDER OSC 39 OSC1
3
V REF
BALANCE CONTROL
3-12. IC BLOCK DIAGRAMS
LV1016
S-CH DC OUT C-CH DC OUT L-CH DC OUT 38 VCC
VR CONTROL
OSC 23 22
R-CH DC OUT VREF
4 5 6 7 8 NR-IREF
37 L-OUT
VDD
L-IN
9 7 VCC
36 R-OUT
VR
21
ADM-CONT
R-IN
10
VR
20
B
A
ADM
8
VSS
11 B
L-IN
A + B L+R (6dB) A A B + B-NR L+DELAY OUT-FILTER (7k/5k) + R+DELAY DC-OUT A B VOL/MUTE S-TRIM LR SRAM
19 18 DC-CUT
9
P. S.
CTRIM
P. S.
VCA 31 R-BPF1
VCA
MUTE
VLR-1 VLR-2
DUAL T CONTROL
-- 27 --
35 S-OUT
VCA 34 C-OUT
VCA
CMODE
VCA
VCA
R-IN
10
17
VCA 33 32 CMODE-CAP. C-TRIM DC CUT
VCA
S-IN
A.GND
A B
16
L-OUT
LPF
L-BPF1 30 29 R-BPF2 R-BPF3
12
LPF
L-BPF2
L-BPF3
13 14
A B
15
RECT DC CUT 28 27 26 25 DC CUT L-R RECT L+R RECT
+
R-OUT
DC CUT DC CUT
RECT
RECT
RECT
14
VREF 11 DELAY-OUT INV-PHASE
R RECT L RECT
15 16 17 18
13
S-OUT 12 DC-CUT
VLR-TH LOG DIFF
19
24
VCS-TH VCS-1
20 21
LOG DIFF
23 22
VCS-2
IC401
1 IN 2 3 OUT 4 5 IN 6 7 OUT 8 9 IN 10 OUT VEE 11 12
LC7822
30 29 IN 28 27 OUT 26 25 IN 24 23 OUT 22 IN 21 LEVEL SHIFT 20 OUT 19 VDD
CONTROL
CE 13 DI 14
LATCH
18 RESET 17 S
CL 15
SHIFT RESISTOR
16 VSS
IC701
µPC2581
BIAS CIRCUIT
PROTECTOR REG DRIVE PRE DRIVE 4 5 6 7 PRE DRIVE 8 9 10 DRIVE
1
2
3
11
12
13 14 15
MUTE
MF1
IN1
IN2
NF2
VCC1
+ VOUT1
VOUT1
COMP1
COMP2
VOUT2
IC202
BA6208
SWITCH
MOTOR DRIVE
SWITCH
MOTOR DRIVE REG
1
2
3
4
5
6
7
+ VOUT2
8
9
INPUT 1
OUTPUT 2
OUTPUT1
GND
Vcc
NC
INPUT 2
NC
-- 28 --
NC
VCC2 VEE
GND