– 7 –
3-3.
Separation Check and Adjustment
Preparation:
Procedure:
1. Set the channel of the transmitter to CH2.
2. Turn OFF the noise filter switch on the transmitter.
3. Enter 1 kHz 316 mVrms signal only to the Lch on the transmitter.
4. Connect an AC voltmeter and an oscilloscope to the Lch speaker output (both ends of MDD01) on the RX-BASE board.
5. Rotating the tuning control (RV302) on the RX-BASE board, receive signals.
6. Adjust the volume control (RV301) on the RX-BASE board so that the Lch speaker output (both ends of MDD01) on the RX-BASE
board becomes 155 mVrms.
7. Connect an AC voltmeter and oscilloscope to the Rch speaker output (both ends of MDD02) and measure voltage.
8. Check that a difference in speaker output level between Lch and Rch (i. e., separation) is over 20 dB. If not over 20 dB, rotate RV303
on the RX-BASE board to minimize the Rch output, then reconfirm that a difference in speaker output level between Lch and Rch is
over 20 dB.
9. Enter 1kHz 316 mVrms signal only to the Rch on the transmitter.
10. Adjust the volume control (RV301) on the RX-BASE board so that the Rch speaker output (voltage across MDD02) on the RX-BASE
board become 155 mVrms.
11. Connect an AC voltmeter and oscilloscope to the Lch speaker output (both ends of MDD01) and measure voltage.
12. Check that a difference in speaker output level between Lch and Rch (i.e., separation) is over 20 dB.
Adjustment Location: RX-BASE board (See page 9.)
AF OSC
ATT
AUDIO IN (Lch or Rch)
1 kHz 316 mVrms
600
Ω
Trans-
mitter
Head-
phones
+
–
+
–
TMR-RF930
MDR-RF930
+
–
+
–
oscilloscope
AC voltmeter
[RX-BASE board] – Conductor Side –
