Sony XR-1750 User manual

XR-1750
US Model
E Model
Australian Model
SERVICE MANUAL
FM/AM CASSETTE CAR STEREO
SPECIFICATIONS
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MG-52A-135
AUDIO POWER SPECIFICATIONS (US model)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
13 watts per channel minimum continuous average power into 4 ohms, 4 channels driven from
20 Hz to 20 kHz with no more then 1% total harmonic distortion.
Cassette player section
Tape track 4-track 2-channel stereo
Wow and flutter 0.08% (WRMS)
Frequency response 30 – 20,000 Hz
Signal-to-noise ratio 58 dB
Tuner section
FM
Tuning range US model:
87.5 – 107.9 MHz
E, Australian model:
50 kHz/200 kHz switchable
87.5 – 108.0 MHz (at 50 kHz step)
87.5 – 107.9 MHz (at 200 kHz step)
Antenna terminal External antenna connector
Intermediate frequency 10.7 MHz
Usable sensitivity 8 dBf
Selectivity 75 dB at 400 kHz
Signal-to-noise ratio 65 dB (stereo), 68 dB (mono)
Harmonic distortion at 1 kHz
0.5% (stereo), 0.3% (mono)
Separation 35 dB at 1 kHz
Frequency response 30 – 15,000 Hz
Capture ratio 2 dB
AM
Tuning range US model:
530 – 1,710 kHz
E, Australian model:
9 kHz/10 kHz switchable
531 – 1,602 kHz (at 9 kHz step)
530 – 1,710 kHz (at 10 kHz step)
Antenna terminal External antenna connector
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity 30 µV
Power amplifier section
Outputs Speaker outputs (sure seal connectors)
Speaker impedance 4 – 8 ohms
Maximum power output 35 W ×4 (at 4 ohms)
General
Outputs Power antenna control lead
Power amplifier control lead
Rear line out (1)
Tone controls Bass ±8 dB at 100 Hz
Treble ±8 dB at 10 kHz
Power requirements 12 V DC car battery (negative ground)
Dimensions Approx. 188 ×58 ×182 mm
(71/2 ×23/8 ×71/4in.) (w/h/d)
Mounting dimensions Approx. 182 ×53 ×161 mm
(71/4 ×21/8 ×63/8in.) (w/h/d)
Mass Approx. 1.2 kg (2 lb. 10 oz.)
Supplied accessories Parts for installation and connections (1 set)
Design and specifications are subject to change without notice.
Ver 1.1 2001.04
9-925-564-12 Sony Corporation
2001D0500-1 e Vehicle Company
C2001.4 ShinagawaTec Service Manual Production Group

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TABLE OF CONTENTS
1. GENERAL
Location of Controls ........................................................ 3
Installation (US Model) ................................................... 4
Installation (E, Australian Model) ................................... 5
Connection....................................................................... 6
2. DISASSEMBLY.......................................................... 8
3. ASSEMBLY OF MECHANISM DECK ........... 10
4. MECHANICAL ADJUSTMENTS ....................... 16
5. ELECTRICAL ADJUSTMENTS
Tape Deck Section ........................................................... 16
Tuner Section................................................................... 16
6. DIAGRAMS
6-1. IC Pin Function Description ............................................ 18
6-2. Printed Wiring Boards –MAIN Section– ........................ 20
6-3. Schematic Diagram –MAIN Section–............................ 23
6-4. Printed Wiring Board –CONTROL Section– ................. 27
6-5. Schematic Diagram –CONTROL Section–.................... 29
7. EXPLODED VIEWS ................................................ 33
8. ELECTRICAL PARTS LIST................................ 37
SERVICING NOTES
Flexible Circuit Board Repairing
•Keep the temperature of the soldering iron around 270 ˚C dur-
ing repairing.
•Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
•Be careful not to apply force on the conductor when soldering
or unsoldering
Notes on chip component replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.

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SECTION 1
GENERAL This section is extracted
from instruction manual.

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1
Note: Follow the disassembly procedure in the numerical order given.
COVER
SECTION 2
DISASSEMBLY
FRONT PANEL ASS’Y
2
A
2
1
3 Remove the cover
to direction of the arrow A .
1 two claws
1 two claws
1 two claws
2 front panel ass’y

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MECHANISM DECK
MAIN BOARD, HEAT SINK
5 mechanism deck
3 two screws
(PTT2.6 × 6)
2 flexible flat cable
(CN1)
5 seven screws
(PTT2.6 × 10)
6 heat sink
2 two ground point
screws
3 main board
4 insulator
1 connector
(CN351)
3 three screws
(PTT2.6 × 6)
4 front chassis
1 three screws
(PTT2.6 × 10)

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SECTION 3
ASSEMBLY OF MECHANISM DECK
Note: Follow the assembly procedure in the numerical order given.
ALIGNMENT OF FRONT SWITCH
1 Align ¢ mark on the rotary switch
the position shown in the figure.
chassis (S) ass’y
2 Align hole in the gear (LDG-D) with the
position shown in the figure.
hole
2 Install the gear (LDG-E).
1 Align hole as shown in the figure.
GEAR (LDGE)