Technics QUARTZ SA-GX100 User Manual

mi MEASUREMENTS ANDADJUSTMENTS
Note: For Z201 (AM ANT and OSC coil), 2202 (AM-IFT), Z321 (L.P.F.), L321/L322 (MPX coil) and L324 (L.P.F.), they are
supplied as adjusted parts. So, do not turn the cores of the parts.
It is not necessary to adjust the AM circuit.
¢ ADJUSTMENT POINTS
FM FRONT-END PACK
FM ANT
AM ANT
e FM ADJUSTMENT
Control positions and equipment used
*FM signal generator (FM-SG).
¢ Distortion analyser
* Oscilloscope
¢ DC electronic voltmeter (DC EVM)
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+ 20 mV) 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.
FM FRONT-END PACK
(FM offset —) (FM offset +) (FM VCO)
FM MPX VCO Adj.
VR301 |
i ak
FM offset coil
FM MONO
DISTORTION coii
° Frequency counter
Choke coil (100)H)
© Resistor (100 kQ)
FM SIGNAL GENERATOR CONDITION
Modulation
1kHz
(MONO)
A feeeny] 2
ooooee
e@00
9 cocgce
Z,

Technics QUARTZ SA-GX100 Specifications

General

Total harmonic distortion	0.05%
Speaker load impedance	8Ω to 16Ω
Tuning range	FM: 87.5 - 108 MHz
Input sensitivity	150mV (line)
Dimensions	430 x 135 x 310 mm
Power output	100W per channel (8 ohms, 20Hz - 20kHz)