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