Sony xr 7081 service manual
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Page 1
SERVICE MANUAL
Dolby noise reduction manufactured under license trom
Dolby Laboratories Licensing Corporation.
"DOLBY" and the double-D symbol DI] are trademarks of
Dolby Laboratories Licensing Corporation.
AEP Model
UK Model
SPECIFICATIONS
Power amplifier section
Outputs Speaker outputs (sure seal
connectors)
Speaker impedance 478 ohms
Maximum power output
27 W x 2 (at 4 ohms)
9 W x 4 (at 4 ohms)
' Measured at 14.4 V
Cassette player section
Tape track 4-track 2-channel stereo
Frequency response {SO-18.000 Hz
SignaHo-noise ratio
Cassette type Dolby B Dolby oft
TYPE II. IV 66 dB 58 dB
TYPE I 63 dB 55 dB
Wow and llutter 0.1% (WRMS)
Tuner section
FM
Tuning range 87.571080 MHz
Antenna terminal External antenna connector
Intermediate trequency
10.7 MHz
Selectivity 75 dB at 400 kHz
Usable sensitivity 12 dBf (75 ohms)
Signal-to-noise 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 H1715.000 Hz
Capture ratio 2 dB
MW/LW
Tuning range MW: 531 -1.602 kHz
LW: 153»281 kHz
Antenna terminal External antenna connector
Intermediate lrequency
450 kHz
Sensitivity MW: 35W
LW: 70uV
U S | M h ©XR-7200
Model Name sing imi ar ec anism
® NEW
T M h T ® MG-55D-31
Tape ransport ec anism ype
® MG-55L-31
General
Output lead Line output connector
Remote control output lead
(tor auxiliaty input)
Amplifier remote control lead
Power antenna relay control
lead
Input lead Auxiliary input connector
Remote control input lead (tor
auxiliary input)
Tone controls Bass 2 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)
Dimensions (without bracket)
Approx, 178 x 5!) X153 mm
(w/h/d)
not incll projecting parts and
controls
Mounting dimensions
Approx. 162 x 53 x145 mm
(w/h/d)
not incl. projecting parts and
controls
Weight Approx. 1.9 kg
Accessory supplied
Mounting hardware (1 set)
FM/MW/LW CASSETTE BAR STEREII
SONY;
Page 2
XR-7081
TABLE OF CONTENTS
S_ecti0" M Page m M ESE
Specifications --------------------- 1 3. ADJUSTMENTS
N0 0" Repairing """"""""""""""" 2 3-1. Mechanical Adjustment ~~~~~
3A2. Electrical Adjustments
1. GENERAL
Location and Function of Controls ---------- 3 DIAGRAMS
Supplied Mounting Hardware -------------- 4 4,1 1C301 ( ll PD751080-F43-IB) ............. 15
Installation ............................. 5 l C Block Diagrams ..................... 21
Connections 6 4-2. Tuner Section Schematic Diagram ~~~~~~~~~~~ 23
Tape Plalybmk 8 4-3. Primed Wiring Boards ~~~~~~~~~~ - 25
AUOmm Tuning 8 4-4. Main Section Schematic Diagram ----------- 29
Manual Tuning -------------- 9
Memry PM Tuning """" 9 5. EXPLODED VIEWS -------------------- 33
Maintenance ............................ 9
s. ELECTRICAL PARTS LIST ------------ 38
2- DISASSEMBLY ......................... 10
[NOTE ON REPAIRING] 0 Note on repalrlng
Note on Repairing AMP Board
When repairing AMP Board removed from the chassis
as shown in Fig 1, check or repair it connected with
lead wires and such like.
When Checking AMP Board separately, connect with a
lead wire between ground patterns as showri in Fig 2.
Ground lead wire
AMP board
Fig. 1
[AMP BOARD)
lead wire (between ground patterns)
*Afier repairing, remove the lead wire.
Fig. 2
_2_
There are two types of the mechanism deck in
XRA7081.
Distinguishing methods are as followings.
1. Distinguishing by the whole mechanism deck
9010062: MG-550-31
9010065 MG«55L-31
fig-i
2. Distinguishing by the playback head
MG-5SD-3 1
p
MG-55L-31
W