Technics QUARTZ SA-R330 - Page 9

. SA-R330
Mi MEASUREMENTS AND ADJUSTMENTS FM STEREO DISTORTION ADJUSTMENT FM SIGNAL GENERATOR CONDITION
Modulation Stereo “L” mode or "'R”
m@FM
1.
Test
equipment
connection
Is
shown
in
figure.
mode
45%,
Pilot
10%
2. Set the unit to “FM” mode. Modulation frequency
eae 2 3. Set the radio f cy displ d signal generator to Output level
Control positions and equipment used SaadGMiias Co
¢ FM signal generator (AM and FM-SG). *AC and DC electronic voltmeter (EVM) 4. Adjust L1 so that the distortion factor of L-CH is minimized.
¢ Stereo modulator «Frequency counter 5. Make sure that the distortion factors of L-CH and R-CH are
© Distortion analyser ¢ Resistor (100kQ) nearly the same with each other to minimum.
* Oscilloscope
Notes:
; : 1.The adjusting screwdriver used should be made of resin.
Note: For 2201, Z202, Z321, L321, L322 and L324, adjusted parts are supplied. So, do not turn the cores of these parts. 2.L1 should be rotated no more 1/4 turn (90 deg.) on elther
side.
Stereo modulator
Output mode... Lor R
FM MONO DISTORTION ADJUSTMENT FM SIGNAL GENERATOR CONDITION
1. Test equipment connection is shown in figure. Modulation
2. Set the unit to “FM” position. Modulation tequeney MONG)
3. Set the radio frequency display and signal generator Output level
to 100.10 MHz.
4. Adjust T201 core so that voltage measured in signal
mode is OmV (0+20mV) in 300mV range.
. Adjust T202.so that the distortion factor of Lch is = ¢ Adjustment points
minimized.
. Repeat steps 4 and 5 a few times. a
.
Make
sure
that
the
distortion
factors
of
Lch
and
Rch
aga
5
AM
ANT
FM
ANT
8 (75Q)
are nearly the same with each other to minimum.
Note:
The adjusting screwdriver used should be made of
resin.
MPX VCO ADJUSTMENT FRONT END PACK
. Test equipment connection is shown in figure.
. Set the unit to “FM auto” position.
. Place the radio frequency display and signal FAROUENCY.
generator to 100.10 MHz. TERMINAL = COUNTER
. Adjust VR301 for 19.00+0.03kHz on frequency
counter reading. iar) O
%* USING ALTERNATE SYSTEM
1. Apply stereo signal from generator or receive the _
stereo broadcast. 5 ©
2. Adjust VR301 until stereo indicator lights up. cS (indicator lighting)
Cement arm of VR301 as shown in figure. oO 5: Adjust point of Pilot circuit
-— ©: Stereo OFF position
: Stereo ON position
FM offset
coil
Modulation Stereo “L” mode or “R”
2.Set
the
unit
to
“FM”
mode.
mode
90%,
Pilot
10%
3.Set the radio frequency display and signal generator to Modulation frequency 1kHz (Pilot 19kHz) FM MONO
100.10MHz.
Output
level
DISTORTION
4.Adjust VR302 so that the R-CH output is minimized when coil
stereo modulator is in “L”(L-CH modulation) mode.
FM STEREO
1.Test equipment connection is shown in figure.
SEPARATION Adj.
MPX VCO Adj.
LPF (fc = 15 kHz ~ 19 kHz)