Technics SA-X800L - Page 16

FM MONO DISTORTION ADJUSTMENT
1. Test equipment connection is shown in figure.
2. Set the unit to “FM” position.
3. Place the radio frequency display and signal
generator setting to 100.10MHz.
4. Adjust T203 core so that voltage measured
in signal mode is OmV (0+30mV) in 300mV range.
5. Adjust T204 so that the distortion factor of
Lch is minimized.
6. Repeat steps 4 and 5 a few times.
7. 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 SIGNAL GENERATOR CONDITION
Modulation..........0..... ee 100%
Modulation frequency.......... 1kHz
Output level............. 66dB
MPX VCO ADJUSTMENT
1. Test equipment connection is shown in figure.
2. Set the unit to “FM auto” position.
3. Place the radio dial and signal generator setting to
100.10 MHz.
4. Adjust VR201 for 38kHz + 0.05kHz on frequency
counter reading.
5. Modulate the pilot by 8% and make sure that the stereo
EYE lights up.
* USING ALTERNATE SYSTEM
1. Apply stereo signa! from generator or receive the stereo
broadcast.
2. Adjust VR201 until stereo indicator lights up.
Cement arm of VR201 as shown tn figure
FM SIGNAL GENERATOR CONDITION
Modulation ........:. 0% (non-modulation)
Output level... 0.0.00; 66dB
FREQUENCY
FM ANTENNA COUNTER
TERMINAL
ars) OS
—S—
: Stereo ON position
©)
®
=
©
=
©:
Stereo
OFF
position
-@
(indicator lighting)
©: Adjust point of Pilot circuit
CASSETTE
MEASUREMENT CONDITION:
¢ Make sure heads are clean.
¢ Make sure capstan and pressure roller are clean.
e Make sure beat-proof switch is ‘‘A’’.
eDOLBY NRSW: “OFF”
TEST TAPE:
Head azimuth adjustment (8kHz, —20dB):
QZZCFM
¢ Tape speed adjustment (3kHz, — 10dB): Q2ZZCWAT
eNormal reference blank: QZZCRA
*CrO2 reference blank: QZZCRX
HEAD AZIMUTH ADJUSTMENT (DECK A/B)
1. Test equipment connection is shown in figure.
2. Playback the azimuth adjusted part (8kHz, —20dB) of
the test tage (QZZCFM} and regulate the angle adjusting
screw so that the outputs of L-CH and R-CH are
maximized. (When the adjusting positions are different
with L-CH and R-CH, find a position where are the out-
puts of L-CH and R-CH are balanced, and then mark the
adjustment.)
3. At the same time,
eliminate phase deflection.
4. After the adjustment, apply screw-lock to the angle
adjusting value.
draw a lissajous waveform and
iO
(GNO) SiGET
O
OSCILLOSCOPE
AZIMUTH SCREW
TAPE SPEED ADJUSTMENT (DECK A/B)
1. Test equipment connection is shown in figure.
2. Place unit into ‘‘TAPE” position.
3. Playback the middle part of the test tage (QZZCWAT).
4. Adjust the VR in the motor so that the output is within
the standard.
| Standard value: 3000 + 20Hz |
SP TERMINAL
FREQUENCY COUNTER
gers]
BIAS OSCILLATION ADJUSTMENT (DECK A)
1. Test equipment connection is shown :n figure.
2. Place unit into “TAPE” position.
3. Place cassette deck into REC mode. (QZZCRA)
4. Adjust L401 for 95~100kHz on frequency counter reading.
ERASE CURRENT ADJUSTMENT (DECK A)
1. Test equipment connection is shown in figure.
2. Place unit into ‘‘TAPE” position.
3. Place cassette deck into REC mode. (QZZCRA)
4. Adjust VR401 for 70+5mV on AC Electronic
Voltmeter. (AC EVM)
Standard value: Normal tape More than 70+5mV
CrO,tape More than 80mV
RECORDING BIAS ADJUSTMENT (DECK A)
1. Test equipment connection is shown in figure.
2. place unit into ‘‘TAPE” position.
3. Place cassette deck into REC mode. (QZZCRA)
4. Adjust VR307 (Lch) and VR308 (Rch) for 4.8+0.1mV
on AC Electronic Voltmeter (AC EVM)
Standard value: Normal tape 4.8+0.1mV
CrO, tape 5~8.0mV
UNIT
FREQUENCY COUNTER
AC EVM
RECORDING CURRENT ADJUSTMENT (DECK A)
. Test equipment connection is shown in figure. (Fig.1)
2. Place unit into ‘‘TAPE”’ position and cassette deck into
STOP mode.
3. Short circuitry to “ERASE HEAD” and TP307 (GND).
4. Place cassette deck into REC mode.
5. Supply AF Oscillator signal (1 kHz) into AUX terminal
and adjust the input level to get 410+10mV on AC
Electronic Voltmeter (AC EVM)
6. Test equipment connection is shown in figure. (Fig. 2)
. Place cassette deck into REC mode. (QZZCRA)
8. Adjust VR305 (Lch) and VR306 (Rch) for 0.38+0.01
mV on AC Electronic Voitmeter (AC EVM)
pany
~
UNIT
TERMINAL
EKIK)
(Lech) (Reh)
AC EVM
(Fig. 2)
AC EVM