Sony XR-2750 Service Manual
Fm/mw/lw cassette car stereo
Hide thumbs
Also See for XR-2750:
- Operating instructions manual (38 pages) ,
- Installation/connections (4 pages)
Table of Contents
Advertisement
Quick Links
SERVICE MANUAL
Cassette player section
Tape track
4-track 2-chanel stereo
Wow and flutter
0.08% (WRMS)
Frequency response
30 – 20,000 Hz
Signal-to-noise ratio
58 dB
Tuner section
FM *
Tuning range
XR-2750:
87.5 – 108.0 MHz
XR-2753:
65.0 – 74.0 MHz (at 30 kHz step)
87.5 – 108.0 MHz (at 50 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
* There are the numerical values measured at 87.5 – 108.0 MHz
MW/LW
Tuning range
MW: 531 – 1,602 kHz
LW : 153 – 281 kHz
Antenna terminal
External antenna connector
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity
MW: 30 µV
LW: 50 µV
MICROFILM
XR-2750/2753
Photo: XR-2753
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
SPECIFICATIONS
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/MW/LW CASSETTE CAR STEREO
AEP Model
UK Model
East European Model
XR-3750/C553SP
MG-52A-135
Speaker outputs (sure seal connectors)
4 – 8 ohms
Power antenna control lead
Bass ±8 dB at 100 Hz
Treble ±8 dB at 10 kHz
12 V DC car battery (negative ground)
Approx. 188 × 58 × 183 mm (w/h/d)
Approx. 182 × 53 × 164 mm (w/h/d)
Approx. 1.6 kg
Parts for installation and connections (1 set)
XR-2750
XR-2753
Advertisement
Table of Contents
Related Manuals for Sony XR-2750
Summary of Contents for Sony XR-2750
- Page 1 XR-2750/2753 SERVICE MANUAL AEP Model UK Model XR-2750 East European Model XR-2753 Photo: XR-2753 Model Name Using Similar Mechanism XR-3750/C553SP Tape Transport Mechanism Type MG-52A-135 SPECIFICATIONS Cassette player section Power amplifier section Tape track 4-track 2-chanel stereo Outputs Speaker outputs (sure seal connectors) Wow and flutter 0.08% (WRMS)
-
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 ............... 4 ing repairing. • Do not touch the soldering iron on the same conductor of the Connections .............. - Page 3 SECTION 1 GENERAL This section is extracted from instruction manual. – 3 –...
- Page 4 – 4 –...
- Page 5 – 5 –...
- Page 6 – 6 –...
- Page 7 – 7 –...
-
Page 8: Disassembly
SECTION 2 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. COVER 1 two screws (PTT2.6 × 6) 3 Remove the cover to ward direction A . COLLAR (A), HANDLE ASS’Y 3 screw (PTT2.6 × 6) 3 screw 1 seven claws 4 handle ass’y (PTT2.6 ×... - Page 9 FRONT PANEL ASS’Y 1 two claws 1 three claws 2 front panel ass’y MECHANISM DECK 3 two screws (PTT2.6 × 6) 5 mechanism deck 1 connector (CNP331) 4 front chassis 2 flexible board (CNP301) 3 three screws (PTT2.6 × 6) –...
- Page 10 POWER BOARD 3 power board 1 three screws (PTT2.6 × 8) 2 two connectors (CNJ400, 401) MAIN BOARD 1 two ground point screws 4 antenna cable 2 ground point screw 3 main board – 10 –...
-
Page 11: 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 12 CHASSIS (S) ASS’Y 2 screw (PS2 × 4) 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 13 LEVER (PINCH SELECTION) 1 Align. 2 lever (pich selection) HEAD PLATE ASS’Y 5 step screw (HP) 5 step screw (HP) 3 Press the ATS lever. 2 Fit shaft in groove. 4 Position the head plate sub ass’y as shown in the figure. ATS lever 1 Fit in groove.
- Page 14 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 15 ARM (SUCTION) 2 Move the arm (suction) in the arrow direction and fit on projection. 1 Fit the arm (suction) on the shaft. projection 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 16 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 17: Mechanical Adjustments
SECTION 4 SECTION 5 MECHANICAL ADJUSTMENTS ELECTRICAL ADJUSTMENTS 1. Clean the following parts with a denatured-alcohol-moistened TEST MODE swab: This set have the test mode function. In the test mode, FM Auto playback head pinch roller Scan/Stop Level and MW Auto Scan/Stop Level adjustments can rubber belt capstan be performed easier than it in ordinary procedure. -
Page 18: Tape Deck Section
See the adjustment location from on page 20 for the TUNER SECTION 0 dB=1 µV adjustment. Cautions during repair When the tuner unit is defective, replace it by a new one be- TAPE DECK SECTION 0 dB=0.775 V cause its internal block is difficult to repair. Tape Speed Adjustment FM Auto Scan/Stop Level Adjustment Procedure:... - Page 19 FM Stereo Separation Adjustment MW Auto Scan/Stop Level Adjustment Setting: Setting: SOURCE button: FM SOURCE and MODE button: MW FM RF signal level meter 30 Ω 15 pF generator antenna jack (J1) 4 Ω 65 pF – AM RF signal generator SPEAKER OUT Carrier frequency : 98.0 MHz...
- Page 20 Adjustment Location: – SET UPPER VIEW – Tape Speed Adjustment RV1 MW Auto Scan/Stop Level Adjustment RV2 FM Auto Scan/Stop Level Adjustment RV4 FM Stereo Separation Adjustment – 20 –...
-
Page 21: 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 2, 3 POS3,POS2 Tape position detection pin 4, 5 POS0,POS1 Tape position detection pin TAPEON Tape power supply control pin CM_ON Capstan motor control pin LM_LOD... - Page 22 Pin No. Pin Name Function 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 Front panel removal or attaching detection pin TELMUT Telephone muting detection pin “L”: 20dB audio muting...
-
Page 26: Ic Block Diagrams
• IC Block Diagrams IC301 CXA2509AQ-T4 IC361 MM1322XFBE 8 OUT2 120µ/ 70µ + – MSMODE – NR BIAS PBFB1 DRSW 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 27 IC601 BA3918-V2 REGULATOR OVER VOLTAGE PROTECT – 2 3 4 – 38 –...
-
Page 28: Exploded Views
Remark Ref. No. Part No. Description Remark 3-012-567-01 COLLAR (A) * 10 A-3313-118-A POWER BOARD, COMPLETE (XR-2750) X-3372-126-1 HANDLE ASSY 3-012-575-01 PANEL (REAR) 3-012-574-01 INSULATOR 3-340-614-11 SCREW (JACK), STEP A-3313-089-A MAIN BOARD, COMPLETE (XR-2753) 3-012-593-01 BRACKET A-3313-117-A MAIN BOARD, COMPLETE (XR-2750) - Page 29 * 67 A-3294-286-A CONTROL BOARD, COMPLETE (XR-2753) AMS. = 0 –. SEL. MUTE) * 67 A-3294-294-A CONTROL BOARD, COMPLETE (XR-2750) 3-009-308-01 BUTTON (1-3) (6. 1. 2. 3) X-3374-100-1 PANEL SUB ASSY (XR-2750) 3-009-309-11 BUTTON (4-6) (4. 5. 6) X-3374-101-1 PANEL SUB ASSY (XR-2753) 3-009-315-01 BUTTON (R) (3) (BTM.
- Page 30 (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 31 (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 32: Electrical Parts List
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < RESISTOR > A-3294-286-A CONTROL BOARD, COMPLETE (XR-2753) A-3294-294-A CONTROL BOARD, COMPLETE (XR-2750) R901 1-216-045-00 METAL CHIP 1/10W R902 1-216-045-00 METAL CHIP 1/10W ************************ R903 1-216-045-00 METAL CHIP... - Page 33 (XR-2753) SW927 1-762-619-11 SWITCH, KEY BOARD (WITH LED) (4/METAL) SW904 1-762-617-11 SWITCH, KEY BOARD (WITH LED) (XR-2753) (+ + ): SEEK/AMS) (XR-2750) SW970 1-762-937-11 SWITCH, ROTARY (D-BASS) SW904 1-762-619-11 SWITCH, KEY BOARD (WITH LED) ************************************************************ (+ + ): SEEK/AMS) (XR-2753)
- Page 34 0.001uF 10% 50V C281 1-126-160-11 ELECT 20% 50V 8-719-040-04 DIODE MA721WK-(TX) 8-719-010-34 DIODE UZ-4.7BSC C285 1-126-160-11 ELECT 20% 50V 8-719-048-54 DIODE MTZJ-T-77-10A (XR-2750) C286 1-163-205-00 CERAMIC CHIP 0.001uF 10% 50V 8-719-110-17 DIODE RD10ESB2 (XR-2753) C301 1-124-234-00 ELECT 22uF 20% 16V...
- Page 35 8-729-900-53 TRANSISTOR DTC114EK < CHIP CONDUCTOR > Q354 8-729-106-60 TRANSISTOR 2SB1115A 1-216-295-00 CONDUCTOR, CHIP (2012) Q355 8-729-900-53 TRANSISTOR DTC114EK 1-216-296-00 CONDUCTOR, CHIP (3216) (XR-2750) Q501 8-729-027-23 TRANSISTOR DTA114EKA-T146 1-216-296-00 CONDUCTOR, CHIP (3216) Q502 8-729-920-74 TRANSISTOR 2SC2412K-QR JC101 1-216-295-00 CONDUCTOR, CHIP...
- Page 36 1-249-393-11 CARBON 1/4W (XR-2753) R501 1-216-097-00 METAL CHIP 100K 1/10W R121 1-216-071-00 METAL CHIP 8.2K 1/10W R502 1-216-073-00 METAL CHIP 1/10W (XR-2750) (XR-2750) R502 1-216-097-00 METAL CHIP 100K 1/10W R122 1-216-065-00 METAL CHIP 4.7K 1/10W (XR-2753) (XR-2750) R503 1-216-097-00 METAL CHIP...
-
Page 37: Ptt2
R857 1-247-807-11 CARBON 1/4W < COIL > < TUNER > L801 1-416-046-11 COIL, CHOKE 400uH A-3282-029-A TUNER UNIT TUX-006/2 (E) (XR-2750) A-3282-031-A TUNER UNIT TUX-006/2 (EE) (XR-2753) < RESISTOR > < VIBRATOR > R534 1-216-057-00 METAL CHIP 2.2K 1/10W R535... - Page 38 7-628-253-00 SCREW +PS 2X4 ************************************************************ ACCESSORIES & PACKING MATERIALS ******************************* 1-782-344-11 CORD (WITH CONNECTOR) (POWER) 3-859-732-11 MANUAL, INSTRUCTION (ENGLISH,FRENCH, SPANISH , TURKISH) (XR-2750) 3-859-732-21 MANUAL, INSTRUCTION (ENGLISH, POLISH, BULGARIAN, MAGYAR, RUSSIAN) (XR-2753) 3-859-733-11 MANUAL, INSTRUCTION, INSTALL (ENGLISH, FRENCH, SPANISH, TURKISH) (XR-2750)
- Page 39 XR-2750/2753 Sony Corporation 97C057548-1 9-925-566-11 Personal & Mobile Communication Company Printed in Germany © 1997. 3 – 50 – Published by Quality Assurance Dept.