Table of Contents
Notes:
1. Use transmitter with check and adjustment alreadycompleted.
2. The transmitter section adjustments should be completed before
performing the headphones section adjustment.
3. On adjusting the headphones section, use the transmitter as a jig.
Headphones
Transmitter
MDR-RF830
TMR-RF830R
Procedure:
AF OSC
L-CH (J403)
1kHz 316mVrms (–7.8dB)
ATT
600
1. Feed a signal to jig (transmitter) and connect a power supply to
DC IN
9V jack (J404).
Receive frequency check and adjustment
1. Set the transmitter channel to CH2.
2. Set the transmitter noise filter SW to OFF .
3. Input a signal of 1kHz 316mVrms to onl y the transmitter L-
CH (J403).
4. Place transmitter and headphones at a distance of more than 5m
apart.
5. Set the VOL (RV301) to MIN.
6. Position RX board TUNING VOL (RV302) to the center .
7. Connect a digital voltmeter (DC range) and an oscilloscope
between
IC301 pin @¡ and GND.
8. First check to make sure that a demodulated waveform of 1kHz
(appr oximately 13mVrms) is outputted to the oscilloscope ,
then
check to make sure the DC voltmeter reading is DC 1 to 1.2V .
9. If a demodulated waveform of 1kHz is not outputted to the
oscilloscope or if the DC level is not within the range specified
above, adjust the RX board L301 so that a demodulated
waveform of 1kHz is outputted to the oscilloscope and while
the wave-form is outputted, further fine adjust the L301 so that
the DC voltmeter reading is DC1.1V.
10. When completed, make sure signals can be received when
switching the transmitter channel to CH1 or CH3 by turning
RX board TUNING VOL (RV302).
Connection points and Adjustment Location:
RX
ELECTRICAL ADJUSTMENTS
Jig
Transmitter
Ω
J404
power supply
(DC 9V)
BOARD (See page 5)
SECTION 2
Separation check and adjustment
1. Set the transmitter channel to CH2.
2. Set the transmitter noise filter SW to OFF .
3. Input a signal of 1kHz 316mVrms to onl y the transmitter L-
CH (J403).
4. Connect an digital voltmeter (AC range) and oscilloscope to
the L-CH speaker outputs (both sides of MDD01).
5. Receive signals by turning the TUNING VOL (RV302).
6. Adjust the VOL (RV301) so that the RX board L-CH speaker
outputs (both sides of MDD01) are 155mVrms.
7. Connect an digital voltmeter (AC range) and oscilloscope to
the R-CH speaker outputs (both sides of MDD02) and measure
the voltages.
8. At this time, check to make sure the level separation of L-CH
and R-CH speaker outputs is more than 20dB. If the separation
is less than 20dB, turn R V303 on the RX boar d so that the R-
CH output is minimal, then check to see if the level separation
of L-CH and R-CH speaker outputs is more than 20dB.
9. Input a signal of 1kHz 316mVrms to only the transmitter R-CH
(J402).
10. Adjust the VOL (RV301) so that the RX boar d R-CH speaker
outputs (both sides of MDD02) are 155mVrms.
11. Connect an digital voltmeter (AC range) and oscilloscope to
the L-CH speaker outputs (both sides of MDD01) and measure
the voltages.
12. At this time, check to make sure the level separation of L-CH
and R-CH speaker outputs is more than 20dB.
Connection points and Adjustment Location:
— 4 —
RX BOARD (See page 5)
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