Sony XRC-353 Service manual
XR-3753/C353
SERVICE MANUAL
East European Model
For RM-X2S (Remote Commander),
please refer to RM-X2S/X3S Service
Manual (9-960-039-∏) previously issued.
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
Turning range 65.0 – 74.0 MHz
(at 30 kHz step)
87.5 – 108.0 MHz
(at 50 kHz step)
Aerial terminal External aerial 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
Photo: XR-3753
SPECIFICATIONS
General
Outputs Power aerial control lead
Tone controls Bass ± 8 dB at 100 Hz
Power requirements 12 V DC car battery
Dimensions Approx. 188 × 58 × 181 mm (w/h/d)
Mounting dimensions Approx. 182 × 53 × 164 mm (w/h/d)
Mass Approx. 1.2 kg
Supplied accessories Parts for installation and connections (1 set)
Design and specifications are subject to change without notice.
Model Name Using Similar Mechanism NEW
T ape Transport Mechanism T ype
Power amplifier control
lead (XR-C353 only)
Telephone mute control
lead (XR-C353 only)
Line out (XR-C353 only)
Treble ± 8 dB at 10 kHz
(negative ground)
Front panel case (1)
Rotary commander
RM-X2S
MG-25A-136
MW/LW
Tuning range MW: 531 – 1,602 kHz
LW: 153 – 281 kHz
Aerial terminal External aerial connector
Intermediate frequency 10.71 MHz/450 kHz
Sensitivity MW: 30 µV
LW: 50 µV
Power amplifier section
Outputs Speaker outputs
(sure seal connectors)
Speaker impedance 4 – 8 ohms
Maximum power output 35 W × 4 (at 4 ohms)
MICROFILM
FM/MW/LW CASSETTE CAR STEREO
TABLE OF CONTENTS
SERVICING NOTES
1. GENERAL
Location of Controls ........................................................ 3
Setting the Clock ............................................................. 3
Using the Rotary Remote ................................................ 3
Adjusting the Sound Characteristics ............................... 4
Muting the Sound ............................................................ 4
Changing the Sound and Beep Tone................................ 4
Installation ....................................................................... 5
Connections ..................................................................... 6
2. DISASSEMBLY.......................................................... 9
3. ASSEMBLY OF MECHANISM DECK............. 11
4. MECHANICAL ADJUSTMENTS ....................... 14
5. ELECTRICAL ADJUSTMENTS
Test Mode ........................................................................ 14
Tape Deck Section ........................................................... 14
Tuner Section................................................................... 15
6. DIAGRAMS
6-1. Printed Wiring Board –Main Section– ........................... 21
6-2. Schematic Diagram –Main Section– .............................. 23
6-3. Printed Wiring Board –Panel Section–........................... 27
6-4. Schematic Diagram –Panel Section–.............................. 29
6-5. IC Pin Function Description ............................................ 31
Flexible Circuit Board Repairing
• K eep the temperature of the soldering iron around 270 ˚C during
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.
7. EXPLODED VIEWS ................................................ 33
8. ELECTRICAL PARTS LIST................................ 36
– 2 –
SECTION 1
GENERAL
This section is extracted
from instruction manual.
– 3 –
– 4 –
– 5 –
– 6 –
– 7 –
– 8 –
SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
FRONT PANEL ASS’Y
1
Push the button
(release).
2
Remove the front panel ass’y
to the direction of the arrow A.
COVER ASS’Y
1
2
A
3
cover ass’y
– 9 –
2
1
SUB PANEL, MECHANISM DECK (MG-25A-136)
3
connector
(CN302)
2
sub panel
1
three screws
(PTT2.6 × 8)
5
screw
(PTT2.6 × 6)
6
mechanism deck
(MG-25A-136)
4
flexible flat cable
(CN301)
1
three screws
(PTT2.6 × 8)
MAIN BOARD, HEAT SINK
2
two ground point
screws
3
main board
4
eight screws
(PTT2.6 × 10)
5
heat sink
1
screw
(PTT2.6 × 8)
– 10 –
1
two screws
(PTT2.6 × 8)
SECTION 3
ASSEMBLY OF MECHANISM DECK
Note: Follow the assembly procedure in the numerical order given.
HOUSING
4
Fit claw on B part.
3
2
Install the hanger onto
two claws of the housing.
Put the housing
under A part.
housing
A
part
5
Fit projection on C part.
C
part
7
Holder the hanger by bending the claw.
1
Install the catch to the hanger.
hanger
6
Fit projection on D part.
8
Hold the hanger by
bending the claw.
D
part
ARM (SUCTION)
projection
B
part
2
Move the arm (suction) in the arrow
direction and fit on projection.
1
Fit the arm (suction) on the shaft.
– 11 –
LEVER (LDG-A) / (LDG-B)
shaft
A
shaft
1
Fit the lever (LDG-A) on
shafts A – C and install it.
B
shaft
C
4
type-E stop ring 2.0
shaft
A
shaft
B
2
Pull the lever in the
arrow direction.
3
Fit the lever (LDG-B) on
shafts A and B and
install it.
GEAR (LDG-FT)
hole
hole
gear (LDG-D)
lever (LDG-A)
gear (LDG-FB)
5
gear (LDG-FT)
5
polyethyene washer
1
2
Move the lever (LDG-B)
in the arrow direction.
tension spring (lever LDG)
3
Align hole in the gear (LDG-D)
with hole the lever (LDG-A).
– 12 –
GUIDE (C)
1
three claws
2
guide (C)
– 13 –
SECTION 4
r
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
1. Clean the following parts with a denatured-alcohol-moistene
swab:
playback head pinch roller
rubber belt capstan
idlers
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the power supply
voltage unless otherwise noted.
• T orque Measurement
Mode Torqu Meter Meter Reading
Forward CQ-102C
Forward
Back Tension (0.01 – 0.06 oz•inch)
Reverse CQ-102RC
Reverse
Back Tension (0.01 – 0.06 oz•inch)
FF, REW CQ-201B
CQ-102C
CA-102RC
30 – 65 g•cm
(0.42 – 0.90 oz•inch)
0.5 – 4.5 g•cm
30 – 65 g•cm
(0.42 – 0.90 oz•inch)
0.5 – 4.5 g•cm
60 – 200 g•cm
(0.83 – 2.78 oz•inch)
TEST MODE
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and AM (MW) Auto Scan/Stop Level adjustments
can be performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Set the “power select” switch (S501) is “A” position.
2. Turn ON the regulated power supply. (All LEDs on the set
lights up, and the clock is displayed.)
Note: Press the OFF button, if the clock is not displayed.
3. Push the preset 4 button.
4. Push the preset 5 button.
5. Press the preset 1 button for more than two seconds.
6. Then the display indicates all lights, the test mode is set.
<Release the Test mode>
1. Push the OFF button.
2. Return the “power select” switch (S501) to initially aet position.
See the adjustment location from on page 17 for the
adjustment.
0 dB=0.775 VTAPE DECK SECTION
• T ape Tension Measurement
Mode Tension Meter Meter Reading
Forward CQ-403A
Reverse CQ-403R
(more than 3.18 oz)
(more than 3.18 oz)
more than 90 g
more than 90 g
Tape Speed Adjustment
Procedure:
1. Put the set into the FWD PB mode.
speed checker
test tape
WS-48A
(3 kHz, 0 dB)
set
speaker out terminal
Specification: Constant speed
Speed checker Frequency counter
–1.5 to +2.5% 2,955 to 3,075 Hz
Adjustment Location: See page 17.
frequency counte
4
Ω
or
+–
– 14 –
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