Advertisement
SEQ-300
:
|
|
ae
2,
SECTION 1
|
GENERAL
- MODEL IDENTIFICATION
SAFETY
CHECK-OUT
1-1. FUNCTION OF CONTROLS
— Specification Label on Jack Plate —
SONY:
GRAPHIC EQUALIZER
MODEL NO, SEQ-300
SERIAL NO.
MADE
IN JAPAN
US, Canadian model: AC 120V 60Hz 5W
AEP model: AC 220V ~50/60Hz 5W
After
correcting
the
original
service
problem,
perform the following safety check before releasing
the set to the customer:
Check the antenna terminals, metal trim, "metallized" —
knobs, screws, and all other exposed metal parts for
AC leakage. Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not
exceed
0.5mA
(S00
microampers).
Leakage
current
can
be
measured
by
any
one
of three
methods.
(FRONT PANEL)
(BACK PANEL)
[1] POWER switch
EQUALIZATION switch
[2] 7 BAND SPECTRUM ANALYZER
[5] TAPE switch
UK model: AC 240V ~50/60Hz 5W
1.
A commercial
leakage
tester,
such
as the
;
[6] REC OUT jack
E
del F
AC
1 10-1 20V
/220-240V
Si
329
RCA
WT
S40A
F
il
h
[3]
Graphic equalizer controls
7
MOQEl.
impson
or
;
:
ollow the
Frequency coverage of each equalizer control
TAPE RECORDER IN jack
~50/60Hz 5W
manufacturers' instructions to use these instru-
GO Liss lds ta Bamseoreut che bacex
LINE IN jack
ments.
150 Hz:
This control governs the low-middle range and
[9] LINE OUT jack
greatly influences the overall characteristics of the
-2.
A battery-operated AC milliammeter.
The Data
sound.
,
AC OUTLET (UNSWITCHED 100W MAX)
Precision 245 digital multimeter is suitable for
400 Hz: Use to adjust the power, spaciousness and warmth
[11] VOLTAGE SELECTOR: E MODEL ONLY
this job
|
of the sound.
(110-120V/220-240V)
JO0:
1 kHz:
Use to provide more presence for vocals.
3.
Measuring the voltage drop across a resistor by
Sas
ee a
brighter: sounc:ang:t0 reduce
stridency.
means
of a VOM
or battery-operated
AC
volt-
6 kHz:
This control effects the treble. Use to adjust the
meter.
The
"limit"
indication
is 0.75 V, so
brightness of the sound and to reduce high
analog
meters
must
have
an
accurate
low-
frequency noise, such as tape hiss.
14 kHz:
This control adjusts the general atmosphere rather
voltage
scale.
The
Simpson
250
and
Sanwa
SH-63Trd
are examples of a passive VOM
that
is suitable.
Nearly all battery operated
digital
multimeters
that
have
a 2V
AC
range
are
suitable.
(See Fig. A)
To Exposed Metal
Parts on Set
AC
voltmeter
(0.75 V)
Earth Ground
Using an AC voltmeter to check AC leakage.
than the sound itself.
Use to highlight the delicate quality of
instrumental sound.
Note:
Follow the disassembly procedure in the numerical order given.
1-2. REMOVAL OF THE CASE
Precaution:
When removing the case, lift it up straight with keeping it holizontal as shown below, otherwise 6 claws( A ) that the
front-panel-side of the case hangs on will be broken.
@ Remove the screws (4pcs).
Q Lift the case up straight.
Advertisement
