Sony xr 7551 service manual

Page 1

SERVICE MANUAL

AEP Model

'1')" twiixfléW/KfX/X/flf/

Tuner section
FM

Tuning range 875-108 MHz
Intermediate frequency

10.7 MHZ
Antenna terminal External antenna connector
Usable sensitivity 12 dBi (75 ohms)
Selectivity 75 dB at 400 kHz
Signal-tonoise ratio

65 dB (stereo). 70 dB (mono)
Harmonic distortion at 1 kHz

0.5% (stereo), 0.3% (mono)

Separation 35 dB at 1 kHz
Frequency response

30- 15.000 Hz
Capture ratio 2 dB
MW/LW

Tuning range MW: 531-1,602 kHz
LW: 153-281 kHz
Intermediate lrequency

450 kHZ
Antenna terminal External antenna connector
Sensitivity 35W
Cassette player section
Tape track 4-track 2-channel stereo
Frequency response
30 - 20,000 Hz
Signal-tomoise ratio
Cassette
type Dolby B Dolby C Dolby oft
TYPE II. N 66 dB 76 dB 58 dB
TYPE I 63 dB 73 dB 55 dB

Wow and flutter 0,09% (WRMS)

Model Name Using Similar Mechanism XR-7500

Tape Transport Mechanism Type MG-55E-31
SPECIFICATIONS
Power amplifier section (hide-away amplifier)
Outputs Speaker outputs (sure seal
connectors)
Inputs Line inputs (photo jacks)
Speaker impedance
2- 8 ohms

Maximum power output
35 watts per channel at 4 ohms (4
channels driven)

Geneml
Output lead Power antenna relay control lead
Power amplifier control lead
Tone controls Bass :10 dB at 100 Hz
Treble :10 dB at 10 kHz
Loudness +10 dB at 100 Hz
+6 dB at 10 kHz
Power requirements
12 V DC car battery (negative
ground)

- Continued on next page A

FM/MW/LW CASSETTE CAR STEREO
SONY;

Page 2

XR-7551

Dimensions Main unit (without bracket):
Approx. 178 x 50 x 153 mm (w/hld)
not incl. projecting parts and
controls
Hideaway amplifier:
Approx. 178 x 30 x 135 mm (wlhld)
not incl. projecting parts and
controls
Mounting dimensions (main unit)
Approx. 182x 53x 145 mm (wlhld)
not incl. projecting parts and
controls
Weight Main unit: Approx. L9 kg
Hideaway amplifier: Approx 0.8 kg
Accessories supplied
Remote controller (1)
Connecting cord (2)
Mounting hardware (1 set)
R03 (size AAA) battery (2)

Design and specifications subject to change without
notice.

TAB LE OF CONTENTS

Section Litl_e Page
Specifications ................ 1
1. GENERAL
Location and Function of Controls ~ - 3
Installation 4
Connections .......................... 6
2. DISASSEMBLY ......................... 7
3. ADJUSTMENTS
3-1. Mechanical Adjustment -------------------- 9
3-2. Electrical Adjustments
Deck Section ............................ 9
Tuner Section ---------------------------- 1 1
DIAGRAMS
4-1. IC501 (,u PD755160) Functional
Description .............................. 15
4-2. Main, key Printed Wiring Boards ............ 19
4-3. Main, Key Schematic Diagram -------------- 23
4-4. Power Amplifier Printed Wiring Boards 27
4-5. Power Amplifier Schematic Diagram -------- 29
5. EXPLODED VIEWS -------------------- 31
6. ELECTRICAL PARTS LIST ------------ 37
Mounting Hardaware ............................ 44