MICROFILM
XR-2750/2753
AEP Model
UK Model
XR-2750
East European Model
XR-2753
SERVICE MANUAL
FM/MW/LW CASSETTE CAR STEREO
SPECIFICATIONS
Photo: XR-2753
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
Power amplifier section
Outputs
Speaker outputs (sure seal connectors)
Speaker impedance
4 8 ohms
Maximum power output 35 W
× 4 (at 4 ohms)
General
Outputs
Power antenna control lead
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 × 183 mm (w/h/d)
Mounting dimensions
Approx. 182
× 53 × 164 mm (w/h/d)
Mass
Approx. 1.6 kg
Supplied accessories
Parts for installation and connections (1 set)
Design and specifications are subject to change without notice.
Model Name Using Similar Mechanism
XR-3750/C553SP
Tape Transport Mechanism Type
MG-52A-135
2
TABLE OF CONTENTS
1.
GENERAL
Location of Controls ........................................................ 3
Installation ....................................................................... 4
Connections ..................................................................... 5
2.
DISASSEMBLY .......................................................... 8
3.
ASSEMBLY OF MECHANISM DECK ........... 11
4.
MECHANICAL ADJUSTMENTS ....................... 17
5.
ELECTRICAL ADJUSTMENTS
Test Mode ........................................................................ 17
Tape Deck Section ........................................................... 18
Tuner Section ................................................................... 18
6.
DIAGRAMS
6-1. IC Pin Function Description ............................................ 21
6-2. Printed Wiring Boards MAIN Section ........................ 23
6-3. Schematic Diagram MAIN Section ............................ 27
6-4. Printed Wiring Board CONTROL Section ................. 32
6-5. Schematic Diagram CONTROL Section .................... 34
7.
EXPLODED VIEWS ................................................ 39
8.
ELECTRICAL PARTS LIST ................................ 43
SERVICING NOTES
Flexible Circuit Board Repairing
· Keep the temperature of the soldering iron around 270 ° C dur-
ing 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.
CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by
the manufacturer.
Discard used batteries according to the manufacturer's instructions.
ADVARSEL!
Lithiumbatteri-Eksplosionsfare ved fejlagtig håndtering.
Udskiftning må kun ske med batteri
af samme fabrikat og type.
Levér det brugte batteri tilbage til leverandøren.
ADVARSEL
Eksplosjonsfare ved feilaktig skifte av batteri.
Benytt samme batteritype eller en tilsvarende type
anbefalt av apparatfabrikanten.
Brukte batterier kasseres i henhold til fabrikantens
instruksjoner.
VARNING
Explosionsfara vid felaktigt batteribyte.
Använd samma batterityp eller en likvärdig typ som
rekommenderas av apparattillverkaren.
Kassera använt batteri enligt gällande föreskrifter.
VAROITUS
Paristo voi räjähtää, jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.
Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.
3
SECTION 1
GENERAL
This section is extracted
from instruction manual.
4
5