Sony xr 7072 service manual

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sony xr 7072 service manual

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Page 1

SERVICE MANUAL

Photo: XFt-7070

U8 Model
Canadian Model
E Model

XR-7070

AEP Model

XR- 7070/7077

Germany Model

XR-7072

NOTE : XR-7070 (US model) is revised

Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MG-38AKV-34
SPECIFICATIONS

AUDIO POWER SPECIFICATIONS

(7070 (US/Canadian»

POWER OUTPUT AND TOTAL HARMONIC DISCRIPTION
10 watts per channel minimum continuous average power
into 4 ohms, both channels driven, from 30 - 20,000 Hz with
no more than 1% total harmonic distortion.

Power amplifier section

Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 3.2 - 8 ohms

Maximum power output 20 W X 4 (at 4 ohms)*
*Measured at 14.4 V

Cassette player section

Tape track 4-tlack 2-channel stereo
Frequency responce 30 - 18,000 Hz
Signal»to»noise ratio

Cassette type Dolby B Dolby off

TYPE Il , IV 66 dB 58 dB

TYPE I 63 dB 55 dB
Wow and flutter 013% (WRMS)

Tuner section
FM
Tuning range

Antenna terminal
Intermediate-frequency
Usable sensitivity
Selectivity
Signal-to-noise ratio

XR-707o (US/Canadian):
87.9 - 107.9 MHZ

XR-7070 (AEP/E)/7071/7072
87.5 s 108.0 MHZ

External antenna connector

101 MHZ

12 dBf (75 ohms)

75 dB at 400 kHZ

65 dB (stereo), 70 dB (mono)

Harmonic distortion at 1 kHz

Separation
Frequency response
Capture ratio

0.5% (stereo), 013% (mono)
35 dB at 1 kHz

30 -- 15,000 HZ

2 dB

- Continured on next page -

Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation
"DOLBY" and the double-D symbol D0 are trademarks of
Dolby Laboratories Licensing Corporation.

FM/AM CASSETTE CAR STEREII
SON!

Page 2

XR-7070/7071/7072

AM (MW/LW)

Tuning range

Antenna terminal

XR-7070 (US/Canadian):
530 - 1,710 kHZ
XR-7070 (AEP/E)/7072
European and other countries
531 - 1.602 kHZ
(at 9 kHz step)
North and South American
countries
530 - 1,620 kHz
(at 10 kHz step)
AM tuning interval 9 kHz/
10 kHz switchable
XR<70712
MW 531 -- 1,602 kHz
LW 153 ~ 281 kHZ
exterminal antenna connector

General

Output lead
Tone controls
Loudness

Power requirements

Power antenna relay control lead
Power amplifier control lead
Bass t 10 dB at 100 Hz

Treble i 10 dB 3110 kHz

+6 dB at 100 Hz

+6 dB at 10 kHz

12 V DC car battery

(negative ground)

Dimensions (without bracket)

Mounting dimensions

Weight
Accessories supplied

Approx. 178 X 50 X 167 mm
(w/h/d)

(7'ln X 2 X 65/; inches)

not incl projecting parts and
controls

Approx. 182 X 53 X 145 mm
(wlh/d)

(7la X 2/- X Sal; inches)

not incl projecting parts and
controls

Approx. 2 kg (4 lb. 7 oz)
Mounting hardware (1 set)

Design and specifications subject to change without notice.

TABLE OF CONTENTS

Intermediate frequency 450 kHz
Sensitivity XR-7070/7072:
35 /.t V
XR-7071:
MW 35 ,uV
LW 70 uV
Section Title Page
Specificafions .................................. 1
1. GENERAL
Installation/Installatichontage ------------ 3
Connections/Connexions/Aansluitingen ------ 5
Location and Function of Controls ----------- 7
Tape Playback ........................... 9
Automatic Tuning ---------------
Manual Tuning -----
Memory Preset Tuning - 11
Disc Playing ------- 12
Maintenance ................... 12
2, DISASSEMBLY ......................... 13
3. ADJUSTMENTS
3-]. Mechanical Adjustments --------
3-2, Electrical Adjustments
Deck Section - 15
Tuner Section ............................ 17
DIAGRAMS
4-1. [c301 u PD75116GF-625-3BE
(Micro Computer) ........................ 20


Section [fie P_agg
4-2. IC Block Diagrams ----------------------- 23
4-3 Printed Wiring Boards

(Type A: XR-7070 (US) Main board

part numbec 1-634-042-11) ---------------- 25
4-4. Schematic Diagrams

(Type A: XR-7070 (US) Main board

part number. l-634~042-1 1) ---------------- 29
4-5. Printed Wiring Boards

(Type B: XR-7o70 (Canadian/AEP/E)/7071

/7072 and XR-7070 (US) Main board

part number. 1-634-042-13) ---------------- 35
4-6. Schematic Diagram

(Type B: XR-7000 (Canadian/AEP/E)/7071

[7072 and XR-7070 (US) Main board

part number. 1-634-042-13) ---------------- 39
5_ EXPLODED VIEWS .................... 44
6. ELECTRICAL PARTS LIST ~~~~~~~~~~~~ 50
Mounting Hardware ............................. 56