Sony STR-DE225 User manual

STR-DE225/DE325
AEP Model
Canadian Model
STR-DE225/DE325
US Model
E Model
Australian Model
Chinese Model
STR-DE325
UK Model
STR-DE225
SERVICE MANUAL
FM STEREO/FM-AM RECEIVER
Manufactured under license from Dolby Laboratories
Licensing Corporation.
“DOLBY”, “PRO LOGIC” and the double-D symbol are
trademarksofDolbyLaboratoriesLicensingCorporation.
MICROFILM
SPECIFICATIONS
Photo : STR-DE225
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
(Weighting
network,
input level)
PHONO 50 74 dB
(STR-DE325) 2.5mV kilohms 72 dB**
(MM) (A, 2.5 mV)
CD,
5.1/DVD 200 mV
INPUT* 50 82 dB
TAPE/MD, kilohms 82 dB**
TV/LD,
VIDEO
**’78IHF
Outputs TAPE/MD REC OUT:
Voltage: 150 mV,
Impedance: 10 kilohms
VIDEOAUDIO OUT:
Voltage: 150 mV,
Impedance: 10 kilohms
WOOFER/MIX AUDIO
OUT:Voltage: 2V
Impedance: 10 kilohms
PHONES: Accepts low and high
impedance headphones
Muting Full mute
BASS BOOST +10dB at 70 Hz
TONE ±8dB at 100 Hz and 10 kHz
FM tuner section
Tuning range 87.5 – 108.0 MHz
Aerial terminals 75 ohms, unbalanced
Sensitivity Mono: 18.3 dBf, 2.2µV /75 ohms
Stereo: 38.3 dBf, 22.5µV /75
ohms
Usable sensitivity 11.2 dBf, 1V /75 ohms (IHF)
S/N Mono: 76 dB
Stereo: 70dB
Harmonic Mono: 0.3 %
distortion at Stereo: 0.5 %
1 kHz
Separation 45dB at 1 kHz
Frequency 30 Hz – 15kHz +0.5 dB
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
–2
— Continued on next page —

STR-DE225/DE325
— 9 — — 10 —
3-3. SCHEMATIC DIAGRAM — DISPLAY SECTION —

STR-DE225/DE325
— 13 — — 14 —
3-5. SCHEMATIC DIAGRAM — POWER SECTION —

STR-DE225/DE325
— 19 — — 20 —
3-8. SCHEMATIC DIAGRAM — MAIN SECTION (1/3) —

STR-DE225/DE325
— 21 — — 22 —
3-9. SCHEMATIC DIAGRAM — MAIN SECTION (2/3) —

STR-DE225/DE325
— 23 — — 24 —
3-10. SCHEMATIC DIAGRAM — MAIN SECTION (3/3) —

— 27 —
3-12. IC BLOCK DIAGRAMS
• IC BLOCK DIAGRAMS
IC1 BU1922
QUALITY BIT
GENERATOR
DEFFERENTIAL
DECODER
BIPHASE
SYMBOL
DECODER
OSCILLATOR
AND
DIVIDER
57kHz
BANDPASS
(8th ORDER)
CONTAS LOOP
VARIABLE AND
FIXED DIVIDER
REFERENCE
VOLTAGE
ANTI-
ALIASING
FILTER
CLOCKED
COMPARATOR
TEST LOGIC AND OUTPUT
SELECTOR SWITCH
RECONSTRUCTION
FILTER
141516 13 12 11 10 9
321 4 5 6 7 8
CLOCK REGENERATION
AND SYNC
VP1
RDCL TS7 OSCO OSCI VDDD VSSD TEST TSTL
D
QUAL
RDDA
Vref
MUX
VDDA
VSSA
CIN
SCOUT
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
ININ
OUT
IN
OUT
IN
IC401, IC500 LC7822
235
46798
1
MUTE
+ VOUT1 – VOUT1
COMP1
MF1
IN1
GND
IN2
NF2
COMP2
– VOUT2 + VOUT2
VCC1 VCC2
VEE
PROTECTOR
BIAS CIRCUIT
REG DRIVE PRE
DRIVE
1110 12 13 1514
DRIVE
PRE
DRIVE
IC701 uPC2581V

— 28 —
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
IC202 BA6208
IC950 NJM2103D
1
2
3
45
6
7
8
V+
VSB/SESIN
VSA
RESET
GND
OUTC
VSC
CR
VREF
+–
–+
–
+
–
+
Q
R S