Technics QUARTZ SA-160

Mi MEASUREMENTS AND ADJUSTMENTS
mFM
Control positions and equipment used
¢ FM signal generator (FM-SG).
Stereo modulator
* Distortion analyser
¢ Oscilloscope
eAC and DC electronic voitmeter (EVM)
e Frequency counter
¢Choke coil (100yH)
¢ Resistor (100 kQ)
Note: For 2201, Z202, L321, L322 and L324, adjusted parts are supplied. So, do not turn the cores of these parts.
FM MONO DISTORTION ADJUSTMENT
1. Test equipment connection is shown in figure.
2. Set the unit to “FM” position.
3. Set the radio frequency display and signal generator
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
minimized.
. Repeat steps 4 and 5 a few times.
. Make sure that the distortion factors of Lch and Rch
are nearly the same with each other to minimum.
Note:
The adjusting screwdriver used should be made of
resin.
MPX VCO ADJUSTMENT
. Test equipment connection is shown in figure.
. Set the unit to “FM auto” position.
. Set the radio frequency display and signal generator
to 100.10MHz.
. Adjust VR301 for 19.00 +0.03kHz on frequency
counter reading.
% USING ALTERNATE SYSTEM
1. Apply stereo signa! from generator or receive the
stereo broadcast.
‘2. Adjust VR301 until stereo indicator lights up.
Cement arm of VR301 as shown in figure.
FM STEREO SEPARATION ADJUSTMENT (For [EG] area.)
1.Test equipment connection is shown in figure.
2.Set the unit to "FM” mode.
3.Set the radio frequency display and signal generator to
100.10MHz.
4.Adjust VR302 so that the R-CH output is minimized when
stereo modulator is in “L”(L-CH modulation) mode.
FM SIGNAL GENERATOR CONDITION
Modulation
Modulation frequency 1kHz
(MONO)
Output level
FM SIGNAL GENERATOR CONDITION
Modulation 0%
FREQUENCY
FM ANTENNA COUNTER
TERMINAL
: Stereo ON position
®-
©)
-
©):
Stereo
OFF
position
-@
{indicator lighting)
© : Adjust point of Pilot circuit
FM SIGNAL GENERATOR CONDITION
Modulation Stereo “L” mode or “R”
mode ‘90%, Pilot 10%
Modulation frequency 1kHz (Pilot 19kHz)
Output level
LPF (fo= T5kHz~ 19kHz)
SA-160
FM STEREO DISTORTION ADJUSTMENT (For [EG] area.) FM SIGNAL GENERATOR CONDITION
Modulation Stereo “L’’ mode or “R”
mode 100%
1. Test equipment connection is shown in figure.
2. Set the unit to “FM” mode.
3.Set the radio frequency display and signal generator to
100.10 MHz.
4. Adjust L1so that the distortion factor of L-CH is minimized.
5. Make sure that the distortion factors of L-CH and R-CH are
nearly the same with each other to minimum.
Modulation frequency
Output level
Notes:
1. The adjusting screwdriver used should be made of resin.
2.L1 should be rotated no more 1/4 turn (90 deg.) on either
side.
Stereo modulator Adjust within +90°
Output mode... Lor R
e Adjustment points
AM ANT FM ANT
FM offset
coil
FM MONO
DISTORTION
coil
FM STEREO
SEPARATION Adj.
MPX VCO Adj.