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MICROFILM
XR-3753/C353
East European Model
SERVICE MANUAL
FM/MW/LW CASSETTE CAR STEREO
SPECIFICATIONS
Model Name Using Similar Mechanism
NEW
Tape Transport Mechanism Type
MG-25A-136
General
Outputs
Power aerial control lead
Power amplifier control
lead (XR-C353 only)
Telephone mute control
lead (XR-C353 only)
Line out (XR-C353 only)
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 × 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)
Front panel case (1)
Rotary commander
RM-X2S
Design and specifications are subject to change without notice.
Photo: XR-3753
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
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)
For RM-X2S (Remote Commander),
please refer to RM-X2S/X3S Service
Manual (9-960-039-
) previously issued.


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TABLE OF CONTENTS
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
7.
EXPLODED VIEWS ................................................ 33
8.
ELECTRICAL PARTS LIST ................................ 36
SERVICING NOTES
Flexible Circuit Board Repairing
· Keep 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.


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SECTION 1
GENERAL
This section is extracted
from instruction manual.


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