Page 1
STR-DE225/DE325
MICROFILM
SERVICE MANUAL
Photo : STR-DE225
Manufactured under license from Dolby Laboratories
Licensing Corporation.
“DOLBY”, “PRO LOGIC” and the double-D symbol are
trademarks of Dolby Laboratories Licensing Corporation.
SPECIFICA TIONS
Amplifier section
Power output
Stereo mode (DIN 1 kHz, 4 ohms)
STR-DE325: 90 W + 90 W
STR-DE225: 40 W + 40 W
Surround (DIN 1 kHz, 4 ohms)
mode Front: STR-DE325: 90W/ch
STR-DE225: 40W/ch
Centre: STR-DE325: 90W
STR-DE225: 40W
(only in PRO LOG IC MODE)
REAR: STR-DE325:
(DIN 1 kHz, 4ohms) 90 W
STR-DE225: (DIN 1 kHz,
4ohms) 40 W
5.1/DVD Front: 90 W/ch
INPUT * mode (DIN 1 kHz, 4 ohms)
Centre: 90 W
(DIN 1 kHz, 4 ohms)
Rear: 45 W/ch
(DIN 1 kHz, 8 ohms)
(except STR-DE225)
Frequency PHONO: RIAA(except STR-DE225)
response equalization curve ±0.5 dB
TV / LD, CD, TAPE / MD,
VIDEO, 5.1/DVD INPUT*:
10Hz - 50kHz ±1dB
Input
Sensitivity Impedance S/N
PHONO 50 74 dB
(STR-DE325) 2.5mV kilohms 72 dB**
(MM) (A, 2.5 mV)
CD,
5.1/DVD 200 mV
INPUT*
TAPE/MD,
TV/LD,
VIDEO
Outputs TAPE/MD REC OUT:
VIDEO AUDIO OUT:
WOOFER/MIX AUDIO
PHONES: Accepts low and high
50 82 dB
kilohms 82 dB**
Voltage: 150 mV,
Impedance: 10 kilohms
Voltage: 150 mV,
Impedance: 10 kilohms
OUT: V oltage: 2V
Impedance: 10 kilohms
impedance headphones
(Weighting
network,
input level)
**’78IHF
AEP Model
Canadian Model
STR-DE225/DE325
US Model
E Model
Australian Model
Chinese Model
STR-DE325
UK Model
STR-DE225
FM tuner section
Tuning range 87.5 – 108.0 MHz
Aerial terminals 75 ohms, unbalanced
Sensitivity Mono: 18.3 dBf, 2.2µV /75 ohms
Usable sensitivity 11.2 dBf, 1V /75 ohms (IHF)
S/N Mono: 76 dB
Harmonic Mono: 0.3 %
distortion at Stereo: 0.5 %
1 kHz
Separation 45dB at 1 kHz
Frequency 30 Hz – 15kHz
response
Selectivity 60 dB at 400 kHz
AM tuner section
Tuning range 531 – 1602 kHz
Aerial Loop aerial
Usable sensitivity 50 dB/m (at 999 kHz)
S/N 54 dB(at 50 mV/m)
Harmonic 0.5%(50 mV/m, 400Hz)
distortion
Selectivity 35 dB
Stereo: 38.3 dBf, 22.5µV /75
ohms
Stereo: 70dB
+0.5
dB
–2
Muting Full mute
BASS BOOST +10dB at 70 Hz
TONE ±8dB at 100 Hz and 10 kHz
FM STEREO/FM-AM RECEIVER
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Page 2
STR-DE225/DE325
3-3. SCHEMATIC DIAGRAM — DISPLAY SECTION —
— 9 — — 10 —
Page 3
STR-DE225/DE325
3-5. SCHEMATIC DIAGRAM — POWER SECTION —
— 13 — — 14 —
Page 4
3-8. SCHEMATIC DIAGRAM — MAIN SECTION (1/3) —
STR-DE225/DE325
— 19 — — 20 —
Page 5
STR-DE225/DE325
3-9. SCHEMATIC DIAGRAM — MAIN SECTION (2/3) —
— 21 — — 22 —
Page 6
3-10. SCHEMATIC DIAGRAM — MAIN SECTION (3/3) —
STR-DE225/DE325
— 23 — — 24 —
Page 7
3-12. IC BLOCK DIAGRAMS
D
• IC BLOCK DIAGRAMS
IC1 BU1922
RDCL
QUAL
IC701 uPC2581V
TS7
QUALITY BIT
GENERATOR
DEFFERENTIAL
DECODER
RDDA
FILTER
DDD
V
BANDPASS
(8th ORDER)
CONTAS LOOP
VARIABLE AND
FIXED DIVIDER
CLOCK REGENERATION
AND SYNC
REFERENCE
DDA
V
VSSD
57kHz
VOLTAGE
VSSA
TEST
TEST LOGIC AND OUTPUT
SELECTOR SWITCH
ANTI-
ALIASING
FILTER
CLOCKED
COMPARATOR
VP1
CIN
OSCO
141516 13 12 11 10 9
OSCILLATOR
DIVIDER
BIPHASE
SYMBOL
DECODER
321 4 5 6 7 8
Vref
AND
OSCI
RECONSTRUCTION
MUX
TSTL
SCOUT
PROTECTOR
REG DRIVE
1
MUTE
2
+ VOUT1
3
IC401, IC500 LC7822
1
IN
2
3
OUT
4
5
IN
6
7
OUT
8
9
IN
10
OUT
11
12
VEE
CE
13
DI
14
CL
15
4
– VOUT1
CONTROL
PRE
DRIVE
5
MF1
COMP1
LEVEL SHIFT
SHIFT RESISTOR
BIAS CIRCUIT
6
IN1
LATCH
PRE
DRIVE
GND
IN2
98
NF2
7
COMP2
DRIVE
1110
– VOUT2
12
+ VOUT2
13
VCC1
1514
VCC2
VEE
30
IN
29
28
OUT
27
26
25
IN
24
OUT
23
22
ININ
21
20
OUT
19
VDD
RESET
18
17
S
16
VSS
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IC202 BA6208
1 2 3 4 5 6 7
NC
INPUT 1
IC950 NJM2103D
CR
1
2
VSC
+
–
SWITCH
SWITCH
INPUT 2
VREF
MOTOR
DRIVE
MOTOR
DRIVE
REG
9
8
OUTPUT1
+
NC
8
RESET
VSA
7
NC
GND
Vcc
OUTPUT 2
–
OUTC
GND
3
4
Q
R S
+
–
6
VSB/SESIN
V+
5
+
–
— 28 —
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