Technics SL-QX300

@ Cartridge section
Type: Moving magnet stereo cartridge Channel separation: 22 dB at 1 kHz
Magnetic circuit: All laminated core Channel balance: Within 1.8dB at 1kHz
Frequency response: 10 Hz~50kHz Recommended load
20 Hz~10 kHz +1 dB impedance: 47 kQ~100 kQ
Output voltage: 2.5 mV at 1 KHz 5 cm/s. zero to Compliance (dynamic): 12 10-§cm/dyne at 100 Hz
peak lateral velocity Stylus pressurerange: 1.25+0.25g(12.5+2.5mN)
(7 mV at 1 kHz, 10 cm/s. zero to Weight: 6 g (cartridge only)
peak 45° velocity [DIN 45 500]) Replacement stylus: EPS-P33ES
@ The power supply fot this unit varies depending upon the areas. Also, the parts used for power supply are different. So,
refer to the circuit diagram and the replacement parts list.
* [EK], [XA] and [XM] areas are provided with voltage selector.
m@ CONTENTS
Page Page
SAFETY PRECAUTION... oo hS SRA eed see ewe 2 REPLACEMENT PARTS LIST
LOCATION
OF
CONTROLS.............20
000
eee
3
Electrical
parts:
0.0:
Funes,
ote)
Cee
a
ce
ee
es
15
DISASSEMBLY
INSTRUCTIONS
................
4~6
Mechanical
parts...
«6
sge<.5
660
sie
Br,
sow
Ryans
apse
bo
a
21
MEASUREMENTS
AND
ADJUSTMENT
...............
7
BLOCK
DIAGRAM).
oa
ccc
os
ee
in
0s
Me
he
Gwe
ee
ow
Gb
16
TROUBLE SHOOTING.............002-02000 8~10 EXPLODED VIEWS
SCHEMATIC
DIAGRAM
...........0000e8eeee
11,
12
Cabinet
and
chassis
parts...
..........0000004
17,
18
CIRCUIT
BOARD
AND
WIRING
Automatic
mechanism
plate
parts.............000
19
CONNECTION
DIAGRAM
...............000:
13,
14
Location
of
auto
mechanism
plate
................
20
PACKING
§ 66.6.
8
aoe Paw
dow
sd
Swe
hw
a
Be
we
a
22
m@ SAFETY PRECAUTION
[2]
ORWN =
. Before servicing, unplug the power cord to prevent an electric shock.
. When replacing parts, use only manufacturer’s recommended components for safety.
Check the condition of the power cord. Replace if wear or damage is evident.
. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
.
Before
returning
the
serviced
equipment
to
the
customer,
be
sure
to
make
the
following
insulation
resistance
test
to
prevent the customer from being exposed to a shock hazard.
INSULATION RESISTANCE TEST
di.
2.
3}
Unplug the power cord and short the two prongs of the plug with a jumper wire.
Turn on the power switch.
Measure
the
resistance
value
with
ohmmeter
between
the
jumpered
AC
plug
and
each
exposed
metal
cabinet
part,
such
as
screwheads
antenna,
control
shafts,
handle
brackets,
etc.
Equipment
with
antenna
terminals
should
read
between
3MQ
and
5.2MQ
to
all
exposed
parts.
(Fig.
A)
Equipment
without
antenna
terminals
should
read
approximately
infinity
to
all exposed
parts.
(Fig.
B)
Note:
Some
exposed
parts
may
be
isolated
from
the
chassis
by
design.
These
will
read
infinity.
4.
Antenna
terminal
Exposed Exposed
metal metal
part
part
Ohmmeter Ohmmeter
(Fig. A) (Fig. B)
Resistance = 3M2—5.2MQ Resistance = Approx oo
If
the
measurement
is
outside
the
specified
limits,
there
is
a
possibility
of
a
shock
hazard.
The
equipment
should
be
repaired
and rechecked
before
it
is
returned
to
the
customer.