Sony XR-1750 Service Manual
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Sony XR-1750 Service Manual

Sony XR-1750 Service Manual

Fm/am cassette car stereo
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SERVICE MANUAL
Ver 1.1 2001.04
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)
Sony Corporation
9-925-564-12
2001D0500-1
e Vehicle Company
C 2001.4
Shinagawa Tec Service Manual Production Group
XR-1750
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
SPECIFICATIONS
Antenna terminal
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity
Power amplifier section
Outputs
Speaker impedance
Maximum power output 35 W × 4 (at 4 ohms)
General
Outputs
Tone controls
Power requirements
Dimensions
Mounting dimensions
Mass
Supplied accessories
Design and specifications are subject to change without notice.
FM/AM CASSETTE CAR STEREO
US Model
E Model
Australian Model
MG-52A-135
External antenna connector
30 µV
Speaker outputs (sure seal connectors)
4 – 8 ohms
Power antenna control lead
Power amplifier control lead
Rear line out (1)
Bass ±8 dB at 100 Hz
Treble ±8 dB at 10 kHz
12 V DC car battery (negative ground)
Approx. 188 × 58 × 182 mm
× 2
× 7
1
3
1
(7
/
/
/
in.) (w/h/d)
2
8
4
Approx. 182 × 53 × 161 mm
× 2
× 6
1
1
3
(7
/
/
/
in.) (w/h/d)
4
8
8
Approx. 1.2 kg (2 lb. 10 oz.)
Parts for installation and connections (1 set)
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  • Page 1 XR-1750 SERVICE MANUAL US Model E Model Ver 1.1 2001.04 Australian Model Model Name Using Similar Mechanism Tape Transport Mechanism Type MG-52A-135 SPECIFICATIONS 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.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SERVICING NOTES GENERAL Flexible Circuit Board Repairing • Keep the temperature of the soldering iron around 270 ˚ C dur- Location of Controls ............3 Installation (US Model) ........... 4 ing repairing. • Do not touch the soldering iron on the same conductor of the Installation (E, Australian Model) ........
  • Page 3 SECTION 1 GENERAL This section is extracted from instruction manual. – 3 –...
  • Page 4 – 4 –...
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  • Page 8: Disassembly

    SECTION 2 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. COVER 3 Remove the cover to direction of the arrow A . FRONT PANEL ASS’Y 1 two claws 1 two claws 1 two claws 2 front panel ass’y –...
  • Page 9 MECHANISM DECK 3 two screws (PTT2.6 × 6) 1 connector (CN351) 5 mechanism deck 2 flexible flat cable (CN1) 4 front chassis 3 three screws (PTT2.6 × 6) MAIN BOARD, HEAT SINK 6 heat sink 2 two ground point 1 three screws screws (PTT2.6 ×...

  • Page 10: Assembly Of Mechanism Deck

    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 hole 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.
  • Page 11 2 screw (PS2 × 4) CHASSIS (S) ASS’Y 2 screw (PS2 × 4) 1 chassis (S) ass’y LEVER (MODE) 1. Align ¢ mark on the rotary switch with hole in the lever (mode). 2. Fit on positions A , B and C and install the lever (mode).
  • Page 12 LEVER (PINCH SELECTION) 1 Align. 2 lever (pich selection) HEAD PLATE ASS’Y 3 step screw (HP) 3 step screw (HP) 2 Fit shaft in groove. 1 Fit in groove. groove – 12 –...
  • Page 13 LEVER (PINCH) ASS’Y 2 two polyethylene washers 1 Fit shaft of the lever (Pinch) ass’y in hole on the chassis (M) ass’y and install the lever (pinch) ass’y. shaft shaft shaft A 3 Install the spring (pinch press) to shaft A . Set the ends of spring to B and C .
  • Page 14 ARM (SUCTION) 2 Move the arm (suction) in the arrow direction and fit on projection. projection 1 Fit the arm (suction) on the shaft. LEVER (LDG-A) / (LDG-B) shaft A shaft A shaft B shaft C shaft B 1 Fit the lever (LDG-A) 3 two type-E stop ring 2.0 on shaft A –...
  • Page 15 GEAR (LDG-FT) 1 gear (LDG-A) 6 polyethylene washer 5 gear (LDG-FT) 2 tension spring (lever LDG) gear (LDG-D) hole 3 Move the lever (LDG-B) in the arrow direction. gear (LDG-A) gear (LDG-FB) 4 Align hole in the gear (LDG-D) with ¢...

  • Page 16: Mechanical Adjustments

    SECTION 4 SECTION 5 MECHANICAL ADJUSTMENTS ELECTRICAL ADJUSTMENTS 1. Clean the following parts with a denatured-alcohol-moistened See the adjustment location from on page 17 for the swab: adjustment. playback head pinch roller rubber belt capstan TAPE DECK SECTION TAPE DECK SECTION 0 dB=0.775 V 0 dB=0.775 V idler...
  • Page 17 Adjustment Location: – SET UPPER VIEW – Tape Speed Adjustment RV1 FM S Meter Adjustment – SET SIDE VIEW – 15 14 Pin !• – 17 –...

  • Page 18: Diagrams

    SECTION 6 DIAGRAMS 6-1. IC PIN FUNCTION DESCRIPTION • MAIN BOARD IC501 µPD17707GC-522-3B9 (SYSTEM CONTROL) Pin No. Pin Name Function – Not used (Fixed at “L”) 2, 3 POS3, POS2 Tape position detection pin 4, 5 POS0, POS1 Tape position detection pin TAPEON Tape power supply control pin CM_ON...
  • Page 19 Pin No. Pin Name Function AMSON At AMS: “L” N_ROUT Forward/reverse control pin TAPMUT Tape muting control pin At muting: “H” Illumination power supply control pin ILLON At PW SEL on: ACC on: “H” At PW SEL off: Power on: “H” SD_IN Station detection signal input pin NOSESW...

  • Page 23: Ic Block Diagrams

    • IC Block Diagrams IC301 CXA2509AQ-T4 IC361 MM1322XFBE 8 OUT2 120µ/ 70µ + – MSMODE – NR BIAS DRSW PBFB1 MODE PBRIN1 OUT1 TAPE/AUX TAPESW PBREF1 INSW TAPE EQ PBFIN1 NRSW MODE FWD/RVS PBGND MS ON/ DETECT – MSOUT PBFIN2 PBREF2 DGND PBRIN2...
  • Page 24 IC601 BA3918-V2 REGULATOR OVER VOLTAGE PROTECT – 2 3 4 – 32 –...

  • Page 25: Exploded Views

    SECTION 7 EXPLODED VIEWS NOTE: • -XX and -X mean standardized parts, so they • Items marked “*” are not stocked since they may have some difference from the original are seldom required for routine service. Some one. delay should be anticipated when ordering •...
  • Page 26 Ver 1.1 2001.04 (2) FRONT PANEL SECTION PL901 PL902 LCD901 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-009-301-01 BUTTON (BASS) * 63 3-010-282-01 PLATE (LCD), GROUND 3-009-299-01 BUTTON (L2) (3) (+.–) * 64 3-009-305-01 SHEET (REFLECTOR) 3-012-576-01 BUTTON (RESET) * 65 3-009-302-01 PLATE (LCD), LIGHT GUIDE...
  • Page 27 (3) MECHANISM DECK SECTION-1 (MG-52A-135) M901 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-928-675-01 BELT (52) 3-933-346-01 CATCHER * 102 3-928-673-01 LEVER (LDG-A) 3-933-344-01 GUIDE (C) 3-928-674-01 LEVER (LDG-B) 3-341-753-11 WASHER, POLYETHYLENE 3-933-341-01 SPRING (LEVER LDG), TENSION 3-933-335-01 GEAR (LDG-FT) 3-928-671-01 HOUSING 3-928-667-01 GEAR (LDG-A)
  • Page 28 (4) MECHANISM DECK SECTION-2 (MG-52A-135) HP901 S901 M902 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-3371-710-1 CHASSIS (S) ASSY 3-364-151-01 WASHER 3-933-337-01 SPRING (B-T-R), CONE COIL * 168 X-3371-701-1 CHASSIS (M) SUB ASSY (A) 3-701-437-01 POLY-SLIDER (A) X-3371-707-1 CLUTCH (PLAY) ASSY 3-933-333-01 GEAR (LDG-E) 3-701-437-21 WASHER...
  • Page 29 SECTION 8 CONTROL ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they When indicating parts by reference parts list may be different from the parts speci- are seldom required for routine service. number, please include the board.
  • Page 30 CONTROL MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark SW910 1-762-619-11 SWITCH, KEY BOARD (WITH LED) (DSPL) C151 1-163-986-00 CERAMIC CHIP 0.027uF 10% 25V SW911 1-762-619-11 SWITCH, KEY BOARD (WITH LED) (BTM) (E, Australian) SW912 1-762-619-11 SWITCH, KEY BOARD (WITH LED) (LCL) C153 1-126-301-11 ELECT 20% 50V...
  • Page 31 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C402 1-124-228-11 ELECT 22uF 20% 10V < DIODE > C406 1-124-584-00 ELECT 100uF 20% 10V 8-719-040-04 DIODE MA721WK-(TX) C407 1-124-584-00 ELECT 100uF 20% 10V 8-719-010-34 DIODE UZ-4.7BSC C408 1-164-004-11 CERAMIC CHIP 0.1uF...
  • Page 32 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark JC21 1-216-295-00 CONDUCTOR, CHIP (2012) < COIL > JC22 1-216-295-00 CONDUCTOR, CHIP (2012) L501 1-410-971-11 INDUCTOR 10uH JC23 1-216-295-00 CONDUCTOR, CHIP (2012) L801 1-416-046-11 COIL, CHOKE 400uH JC24 1-216-295-00 CONDUCTOR, CHIP (2012)
  • Page 33 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R152 1-216-067-00 METAL CHIP 5.6K 1/10W R502 1-216-238-00 METAL CHIP 1/8W (E, Australian) (E, Australian) R152 1-216-071-00 METAL CHIP 8.2K 1/10W R502 1-216-246-00 METAL CHIP 100K 1/8W (US) (US) R161...
  • Page 34 XR-1750 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R589 1-249-417-11 CARBON 1/4W ************** R590 1-249-417-11 CARBON 1/4W HARDWARE LIST R591 1-216-081-00 METAL CHIP 1/10W ************** R592 1-216-105-00 METAL CHIP 220K 1/10W R593 1-216-073-00 METAL CHIP 1/10W 7-685-792-09 SCREW +PTT 2.6X6 (S)
  • Page 35 XR-1750 MEMO...
  • Page 36 XR-1750 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 2001.04...

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