Technics SA-X800L - Measurements and Adjustmentg

Procedure
How to remove the volume control
button, muting button, balance
control button and input selector
button
¢ Remove the buttons from guide pin.
Front Panel
Ref. No.
9
Procedure
1—2-3—
4-8-9
Balance Control Button
How to remove the cassette lid
e Remove the spring in the direction of
allow (@) damper gear assembly in the
direction of allow (®) with radio pliers
or the like.
¢ Draw out the cassette holder lid in the
direction of allow (@).
Ref. No. How to remove the mechanism
8 (DECK A, B) unit
Procedure
1-2-3—
4-8
e Remove the 8 screws (Q9~®).
¢ Remove the 4 connectors
(J301~303, 401).
aia
How
to
remove
the
remote
control
Procedure
10
e Remove the Battery cover lid.
¢ Insert a screwdriver blade between the
upper and lower covers inside the
battery compartment and them slowly
loosen the bottom cover.
Battery Cover Lid
Upper Cover
MMEASUREMENTS AND ADJUSTMENTS
@ LW/MW/FM
Control positions and equipment used
¢ AM and FM signal generator (AM and FM-SG)
eStereo modulator
* Distortion analyser
* Oscilloscope
¢AC and DC electronic voltmeter (EVM)
So, do not turn the cores of this parts.
MW-RF ADJUSTMENT
1. Test equipment connection is shown in figure.
2. Set the unit to “MW” position.
3. Place the radio dial and signal generator setting to
612kHz.
4. Adjust L208 for maximum output.
5. Place the radio dial and signal generator setting to
1503 kHz.
6. Adjust CT202 for maximum output.
7. Repeat steps 3.~6.
Note:
Antenna input level must be as low as possible
being free from AGC.
e Frequency counter
Choke coil (100 WH)
e Resistor (100kQ)
Ceramic capacitor (200 pF)
eAM dummy antenna
Note: For T202 (MW IFT), L210 (MW OSC coil) and L211 (LW OSC coil), adjusted parts are supplied.
AM SIGNAL GENERATOR CONDITION
Modulation..........cccccesessecees 30%
AC EVM Oscilloscope
ee ‘Capacitor Output
200pF terminal
LW-RF ADJUSTMENT
1. Test equipment connection is shown in figure.
2. Set the unit to “LW” position.
3. Place the radio frequency display and signal
generator setting to 155kHz.
4. Adjust L209 for maximum output.
5. Place the radio frequency display and signal
generator setting to 353kHz.
6. Adjust CT203 for maximum output.
7. Repeat steps 3.~6.
Note:
Antenna input level must be as low as possible
being free from AGC.
AM SIGNAL GENERATOR CONDITION
Modulation..........c.cccsecees 30 %
Capacitor Output
200pF terminal
FM-RF ADJUSTMENT
1. Test equipment connection is shown in figure.
2. Place unit into “FM” position.
3. Place the radio dial and signal generator setting to
100.10MHz. Add weak input so that noise is
included in the output waveform.
4. Adjust CT201 and T201 so that the output
waveform is vertically symmetrical.
Note:
As three output reading will be present,
adjustments must be made at center frequency.
FM SIGNAL GENERATOR CONDITION
Modulation... cece 100%
Modulation frequency............ 1kHz
Output level... eee 66dB
AC EVM OSCILLOSCOPE