Sony ST-JX44L Service Manual page 2

ST-JX44L
MWILW tuner section
MW LW
Tuning range §22 kHz — 1,602 kHz 153 KHz - 344 kHz
ferrite-bar provided provided
antenna
Antenna
external
antenna provided provided
terminal
Intermediate 450 kHz 450 kHz
frequency
ferrite-bar 200 pV/im 500 pV/m
Usable antenna (at 1,000 kHz) (at 230 kHz)
Seren uIty external 30 uV 50 pV
antenna (at 1,000 kHz) (at 230 kHz)
Signal-to-noise ratio 55 dB 55 dB
Harmonic distortion 0.3% 0.3%
ao 35 dB 35 dB
Selectivity (@ kHz) Q kHz)
Image response ratio 45 dB 45 dB
(at 999 kHz) (at 230 kHz)
General
System PLL quartz-locked digital synthesizer
system
System FM stereo, FM/AM superheterodyne tuner
Power requirements AEP model: 220 V ac (or 240 V ac adjustable by
authorized Sony personnel), 50/60 Hz
UK model: 240 V ac (or 220 V ac adjustable by
authorized Sony personnel), 50/60 Hz
Memory back-up power: 3 V dc, two bat-
teries, IEC designation R6 (size AA)
Battery life: approx. 1 year with Sony
SUM-3(NS) New Super Batteries
Power consumption 8 watts
Dimensions Approx. 430 x 55 x 300 mm (w/h/d)
(17 x 2!/4 x 117/s inches)
including projecting parts and controls
Weight Approx. 2.9 kg (6 Ibs 7 oz) net
Approx. 3.4 kg (7 Ibs 8 oz) in shipping carton
MODEL IDENTIFICATION
— Specification Label —
SONY
FM STEREO/FM-AM TUNER
FREQUENCY RANGE : FM87.5 —1O8MHz
LW 153-344kHz ==MW522—1602kHz
50/60Hz
=
MODEL NO ST—JUX44L
IF [FMIO.7MHz AM450kHz
- Ae t g e 8W
1
SERIAL _NO,
FEATURES
The quartz-locked digital frequency-synthesizer system allows ac-
curate and stabie tuning that is not affected by temperature varia-
tions or long period usage.
Quick and accurate station selection is possible with an electronic
digital readout on the frequency display window. Tuning can be
done either by changing frequency display reading rapidly, or step
by step.
The MEMORY SCAN button allows you to scan automatically the
preset stations only, listening to each one for a few seconds to
check if there is anything you would like to listen to.
FM muting circuit is incorporated to eliminate any interstation
noise. The setting of the S{ERE° switch can also be memorized for
each station, and permits one-touch reception with a suitable
mode/FM muting setting.
A beat-cut filter for eliminating 114 kHz beats is provided prior to
the multiplex circuit to assure better FM stereo reception.
Circuit highlights
Excellent reception characteristics are assured by employing
carefully selected parts: a MOS FET in the RF amp. for high sen-
sitivity and excellent spurious response ratio, three uni-phase
filters and an IC in the IF amplifier for high selectivity, and a phase-
locked loop IC for excellent separation and low-distortion
characteristics.
The memory contents are retained by two memory back-up bat:
teries when the power is turned off. These memory back-up bat-
teries also aliow the last station tuned in to be held in the memory.
With the RM-44 system remote controller, you can remotely control
power on/off and prememorized station selection.
AEP model: 220V ~
UK model: 240V ~
AEP-W. Germany model: