Sony xr 7450 service manual

Page 1

SERVICE MANUAL

AEP Model

Power amplifier section (hide-away amplifier)

Outputs Speaker outputs (sure seal
connectors)

Inputs Line inputs (phono jacks)

Speaker impedance

32-8 ohms
Maximum power output
30 watts per channel at 4 ohms (4
channels driven)
'Measured at 14.4 V

Cassette player section

Tape track rack 2-channei stereo
Frequency response
30 -20,000 Hz
SignaHo-noise ratio
Cassette
D l B Dolb C Dol oil
type 0 by y by
TYPE II, IV 66 dB 76 dB 58 dB
TYPE I 63 dB 73 dB 55 dB

WW and flutter 099% (WFtMS)

Model Name Using Similar Mechanism

XR-7201 I7 202

Tape Transport Mechanism Type

MG-550-31

SPECIFICATIONS

Tuner section
FM
Tuning range 875-10610 MHz
Antenna terminal External antenna connector
Intermediate lrequency

10,7 MHZ
Usable sensitivity 12 em (75 ohms)
Selectivity 75 dB at 400 kHz
Signal-tortoise ratio

55 dB (stereo), 70 dB (mono)
Harmonic distortion at 1 kHz

05% (stereo), 0.3% (mono)

Separation 35 dB at 1 kHz
Frequency response

30-15900 Hz
Capture ratio 2 dB
AM

AM tuning interval
9 kHz/10 kHz switchable
European and other countries
531-1502 kHz (at 9 kHz step)
Central and South American
countries
530-1520 kHz (at 10 kHz step)
Antenna terminal External antenna connector
Intermediate frequency
450 kHz
35pV

Tuning range

Sensitivity

Dolby noise reduction manufactured under license from

Dolby Laboratories Licensing Corporation.

DOLBY and the double-D symbol DU are trademarks of

Dolby Laboratories Licensing Corporations

General
Output lead Power antenna relay control lead
Tone controls Bass :10 dB at 100 Hz

Treble :10 dB at 10 kHz
Loudness +7 dB at 100 Hz

+7 dB at 10 kHz
Power requirements
12 V DC car battery (negative
ground)
Dimensions
Main unit (without bracket):
Approx. 178 x 50 x 153 mm (w/h/d)
not incl. projecting parts and
controls
Hide-away amplifier:
Approx. 173 x 30 x 135 mm (w/hld)
not incl. projecting parts
Mounting dimensions (Main unit)
Approx 182 x 53 x145mm (wlhld)
not incl. proiecting pans and

controls
Weight
Main unit: Approx 13 kg
Hide-away amplifier:
Approx. 0.8 kg

Accessories supplied
Mounting hardware (1 set)
Connecting cord (2)

Design and specifications subject to change without
notice.

EM/AM CASSETTE CAR STEREO

ONYE

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XR-7450

Tuner section

- SSIR (Sony Super Inlerlerence Rejection) PLL
Synthesizer tuner.

- Automatic memory lunction stores a total of 24
stations in memory quickly and easily.

- Memory scan function scans preset stations for five
seconds in order.

Cassette deck section

- Full logic control leather touch mechanism.

- Amorphous head which produces clear sound.

a The auto»reverse lunction changes the tape direction
automatically.

t The C-type Dolby NR wetern is incorporated as well
as the B-type Dolby NFt system.

- intro-play scans the beginning of each selection
sequentially.

- Repeat play plays the selection being played
repeatedly

- Blank skip function automatically skips the blank
portion longer than eight seconds and plays back the
next selection.

CD section (when the optional Sony CD changer is

connected)

0 The intro-play tunction plays the first ten seconds of
each selection on every disc.

- The repeat play lunction enables a repeat play of the
selection you are now listening to.

- The disc scan function plays the tirsl ten seconds of
the tlrst selection on each disc.

0 The shuttle play lunction plays selections in random
order

- Manual search allows you to search for a desired
point in a selection.

General

- Composed of the main unit and the hideaway
4-channel power amplifier with a maximum power
output of 30 W per channel.

- SUB WOOFEFl output for powerful bass reproduction
system.

0 Slide-out security bracket allows you to take the unit
away with you when you leave your car. You can also
choose the fixed mounting with the supplied
hardware.

TABLE OF CONTENTS

Section Title Page
Specifications .................................. 1
Features ................................ . . 2
1. GENERAL
Location and Function of Controls ----------- 3
Installation 4
Connections 6
Tape Playback ------- 8
Automatic Tuning ----- 8
Manual Tuning ---------- 9
Memory Preset Tuning 9
Disc Playing ------------ 9
Maintenance ............................. 10
2' DISASSEMBLY ......................... 11
3. ADJUSTMENTS
3-1. Mechanical Adjustment ~~~~~~~~~~~~~~~~~~~~ l3
3«2. Electrical Adjustments ------------------ l3
4. DIAGRAMS
ICZ ( /1 PD751IZGF-540-3BE)
IC701 ( u PD7508HG-662-22)
Description .............................. 19
4.1. Printed wiring Board ..................... 24
4-2. Main, Display Block Schematic Diagram ----- 29
4-3. Dolby, Mechanism, Sub-woofer Block
Schematic Diagram ----------------- 33
4-4. Power Amp Board Schematic Diagram
and Printed Wiring Board --------------- . - - 37
5_ EXPLODED VIEWS .................... 41
6. ELECTRICAL PARTS LIST ----- ~ ------ 47
MOUNTING HARDWARE
501 3-310-655-Ol SUPPORT (ND) , FITTING
502 3-302-126-01 SCREW, TAPPING (DIA. 5X20)
503 7-682-583-04 SCREW +P 5X40
504 7-684-025-04 N 5, TYPE 2
505 3-349-4l 0-01 BUSHING
506 *3-349-456-0l BRACKET IFIX,LEFT)
*3-349-457-Ol BRACKET (FIX,RIGHTl
507 *3-349-458-01 FRAME, ORNAPENTAL
501 502 503 504 505
x1 x 1 x1 x 1 x I

506 507
g Lu Y

Not supplied

Q

Rxl *1