Sony XR-C750 Service Manual
XR-C750
SERVICE MANUAL
SPECIFICA TIONS
AUDIO POWER SPECIFICA TIONS (US model)
POWER OUTPUT AND TOTAL HARMONIC DISTOR TION
17 watts per channel minimum continuous average power into
4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more than
1 % total harmonic distortion.
US Model
E Model
Model Name Using Similar Mechanism XR-C500
T ape Transport Mechanism Type MG-52B-135
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
Cassette type Dolby B NR Dolby C NR Dolby NR off
TYPE II, III, IV 67 dB 73 dB 61 dB
TYPE I 64 dB 70 dB 58 dB
Tuner section
FM
Tuning range US model :
87.5 - 107.9 MHz
E model :
FM tuning interval :
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 9 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 (US model)
Tuning range 530 - 1,710 kHz
Antenna terminal External antenna connector
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity 30 µV
MW (E model)
Tuning range MW tuning interval :
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
– Continued on next page –
FM/AM CASSETTE CAR STEREO
US Model
FM/MW/SW CASSETTE CAR STEREO
E Model
MICROFILM
– 1 –
SW1, 2 (E model)
Tuning range SW1 : 2,940 - 7,735 kHz
SW2 : 9,500 - 18,135 kHz
(except for 10,140 - 11,575
kHz)
Antenna terminal External antenna connector
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity 50 µV
Power amplifier section
Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 4 - 8 ohms
Maximum power output 40 W × 4 (at 4 ohms)
US model :
35 W × 4 (at AM band, 4
ohms)
E model :
35 W × 4 (at MW and SW
band, 4 ohms)
General
Outputs Line outputs (3)
Power antenna relay
control lead
Power amplifier control
lead
Tone controls Bass ± 8 dB at 100 Hz
Treble ± 8 dB at 10 kHz
Power requirements 12 V DC car battery
(negative earth)
Dimensions Approx. 184 × 50 × 176 mm
(7 1/4 × 2 × 6 7/8 in.)
(w/h/d)
Mounting dimensions Approx. 182 × 53 × 163 mm
(7 1/4 × 2 1/8 × 6 1/2 in.)
(w/h/d)
Mass Approx. 1.3 kg (2 lb. 14 oz.)
Supplied accessories Parts for installation and
connections (1 set)
Front panel case (1)
Rotary remote RM-X2S (1)
Wireless remote
RM-X45 (1) (E model)
Design and specifications are subject to change without
notice.
T ABLE OF CONTENTS
1. GENERAL
Location of Controls.................................................................. 3
Setting the Clock ....................................................................... 3
Cassette Player .......................................................................... 3
Radio ......................................................................................... 4
Other Functions ......................................................................... 5
CD/MD Changer ....................................................................... 7
Additional Information .............................................................. 9
Connections ............................................................................. 11
2. DISASSEMBL Y
2-1. Cover Assy .......................................................................... 13
2-2. Front Panel Assy ................................................................. 13
2-3. Sub Panel Assy.................................................................... 14
2-4. Mechanism Deck Block ...................................................... 14
2-5. Heat Sink ............................................................................. 15
2-6. Main Board ......................................................................... 15
3. ASSEMBL Y OF MECHANISM DECK
Alignment of Rotary Switch.................................................... 16
Gear (LDG-E).......................................................................... 16
Chassis (S) Assy ...................................................................... 17
Lever (Mode) ........................................................................... 17
Lever (Pinch Selection) ........................................................... 18
Head Plate Assy....................................................................... 18
Lever (Pinch) Assy .................................................................. 19
Housing ................................................................................... 19
Arm (Suction).......................................................................... 20
Lever (LDG-A)/(LDG-B)........................................................ 20
Gear (LDG-FT) ....................................................................... 21
Guide (C) ................................................................................. 21
4. MECHANICAL ADJUSTMENTS................................. 22
5. ELECTRICAL ADJUSTMENTS
Deck Section............................................................................ 22
Tuner Section........................................................................... 23
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.
6. DIAGRAMS
6-1. IC Pin Descriptions ............................................................. 26
6-2. Block Diagram –TC Section– ............................................. 29
6-3. Block Diagram –Main Section–.......................................... 31
6-4. Printed Wiring Boards –Main Section– .............................. 33
6-5. Schematic Diagram –Main Section–................................... 37
6-6. Printed Wiring Boards –Panel Section–.............................. 42
6-7. Schematic Diagram –Panel Section– .................................. 44
7. EXPLODED VIEWS
7-1. Chassis Section ................................................................... 51
7-2. Front Panel Section ............................................................. 52
7-3. Mechanism Deck Section-1 ................................................ 53
7-4. Mechanism Deck Section-2 ................................................ 54
8. ELECTRICAL P ARTS LIST ...................................... 55
Dolby noise reduction manufactured under license from Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation.
– 2 –
– 3 –
SECTION 1
GENERAL
This section extracted from
US model’s instruction manual.
– 4 –
– 5 –
– 6 –
– 7 –
– 8 –
– 9 –
– 10 –
– 11 –
– 12 –
SECTION 2
DISASSEMBL Y
Note : Follow the disassembly procedure in the numerical order given.
2-1. COVER ASSY
1 claw
4 cover assy
3 claws
2-2. FRONT P ANEL ASSY
2 claw
3 Push the bearing (L).
1 Push the button (OPEN).
2 Push the bearing (R).
4 front panel assy
– 13 –
2-3. SUB P ANEL ASSY
3 PTT 2.6x8
4 claws
5 claw
2 PTT 2.6x8
2-4. MECHANISM DECK BLOCK
1 PTT 2.6x8
6 sub panel assy
1 screws
(2.6x6) (C TIGHT)
2 CN201
4 mechanism deck block
3 CN231
– 14 –
2-5. HEA T SINK
1 CN302
2-6. MAIN BOARD
8 heat sink
7 PTT 2.6x8
5 PTT 2.6x8
4 PTT 2.6x8
2 PTT 2.6x8
3 cord (with connector)
6 PTT 2.6x8
2 ground point screws
1 ground point screw
3 MAIN board
4 insulator
– 15 –
SECTION 3
ASSEMBL Y OF MECHANISM DECK
Note : Follow the assembly procedure in the numerical order given.
ALIGNMENT OF ROT ARY SWITCH
hole
1 Align ¢ mark on the rotary switch
the position shown in the figure.
chassis (S) assy
GEAR (LDG-E)
1 Align hole as shown in the figure.
2 Align hole in the gear (LDG-D) with
the position shown in the figure.
2 Install the gear (LDG-E).
– 16 –
CHASSIS (S) ASSY
3 screw (PS 2x4)
2 screw (PS 2x4)
1 chassis (S) assy
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).
rotary switch
A
¢ mark on rotary switch
lever (mode)
C
hole in lever (mode)
B
– 17 –
LEVER (PINCH SELECTION)
1 Align.
2 lever (pinch selection)
HEAD PLA TE ASSY
2 Fit shaft in groove.
6 step screw (HP)
5 step screw (HP)
head plate sub assy
3 Press the ATS lever .
4 Position the head plate sub
assy as shown in the figure.
ATS lever
1 Fit in groove.
– 18 –
groove
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