Sony xr 1250 service manual

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XR-lZ5fl

SERVICE MANUAL

E Model

Model Name Using Similar Mechanism XR-1550
Tape Transport Mechanism Type MG-301TN-38
SPECIFICATIONS
Cassette player section General

Tape track 4«tracl< Z-channel stereo Output lead Power antenna rela}

Wow and flutter 0.2 7c (WKHS) control lead

Frequency response 30 - 15,000 Hz Tone controls 12 dB at 10 kHz

Signal-to- noise ratio 50 d8 Power requirements 12 V DC car battery
(negative ground)

Tuner sedion Dimensions Approx. 188 x 58 x 170 mm
(w/h/dl not incl.

F M projecting parts and

Tuning range 87.5 - 108 MHz controls

Antenna terminal External antenna connector Mounting dimension Approx. 182 x 53 x 165 mm

Intermediate frequency 107 MHz (w/h/d) not incl.

Usable sensitivity 12 dBf projecting parts and

Selectivity 65 dB at 400 kHz controls

Signal~to~noise ratio 53 dB (stereo), 60 dB Mass Approx. 1.5 kg

(mono) Supplied accessories Mounting hardware (1 set)

Harmonic distortion at 1 kHz

LB 7: (stereo), 1.0 %
(mono)

Design and spetlficatr'ons are sub/Mt to change without

antics.
Separation 25 dB at 1 kHz
Frequency response 30 - 5,000 Hz
Capture ratio 9 dB
AM

Tuning range

Antenna terminal
Intermediate frequency
Sensitivity

AM tuning interv l:

9 kHz/10 kHz stxltchable
322 -- 1,620 kHz (at 9 kHz
Step)

520 - 1.720 kHz. (at It) kHz
step)

External nntenm connector
450 kHz

35 _u\

Power amplifier section

Outputs

Speaker impedance

Speaker outputs
(sure seal connectors)
4 - 8 ohms

Maximum power output 7 W x -l (at 4 ohms)

15Wx2(at~lohms)

FM/AM CASSETTE CAR STEREO

SONY;

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TABLE OF CONTENTS

Section Ltle Egg
1. GENERAL

Button Locations .................................. 3

Listening to Tape Playback ........................ 3

Tuning in a Station ................................ 3

Memorizing Stations .

Maintenance

Connections ........................................ 6
2. DISASSEMBLY
21. Cover ........................................ 8
22. Front Panel Assy H ..... 8
2-3. Mechanism Deck Block . . . .9
24 Main Board ...................................... 9
3. MECHANICAL ADJUSTMENTS ................. 10
4. ELECTRICAL ADJUSTMENTS

Deck Section i . .

Tuner Section .....
5. DIAGRAMS
5-1. Circuit Boards Location ..............
5-2. Printed Wiring Boards-Main Section-
5~3. Schematic Diagram-Main Section (1/3)- ........ 19
5-4. Schematic DiagramMMain Section (2/ 3)- ........ 22
5-5. Schematic Diagram-Main Section (3/3)- ........ 25
5-6. Schematic Diagram~Volume Section- .......... 28
5-7. Printed Wiring BoardSvVolume Section ........ 31
6. EXPLODED VIEWS
6-1. Cover Section .................................. 35
6-2. Chassis Section ................................. 36
6-3. Front Panel Section ........................ 37
6-4. Mechanism Deck Section ........................ 38
7. ELECTRICAL PARTS LIST ...................... 39