10
MDR-IF3000
SECTION 3
ELECTRICAL ADJUSTMENTS
PRECAUTION
1. These adjustments should be performed in the order in which
they appear. It is required as a rule to adjust the processor
section (DP-IF3000) before adjusting the headphone section
(MDR-IF3000).
2. Adjustment and measurement should be made on each channel
unless otherwise specified.
3. Adjust on the left channel before adjusting on the right
channel.
4. Supply a power voltage of 9 V to the processor section (DP-
IF3000) and a power voltage of 2.4 V to the headphones
section (MDR-IF3000).
Headphones Section -10 dBV = 315mVrms
Note:
1. Use the processor section (DP-IF3000) as a jig for
adjusting the headphones section (MDR-IF3000).
Tuning Adjustment
Preparation:
low-frequency
oscillator
attenuator
jig
processor
INPUT IN
jack (J051)
1 kHz 315 mV (-10 dBV)
stabilized
power (9 V dc)
600
Ω
1. Apply the input to the jig (DP-IF3000), and connect a
stabilized power to the DC IN 9V jack (J301).
2. Supply 2.4 V dc between BATT (+) and BATT (–) on the BATT
board.
3. Set the RV602 (volume control) on the RX board to the mini-
mum level.
Connection:
100
µ
F/16 V
+
+
RX board
TP7 (L-ch)
TP8 (R-ch)
distortion meter
Adjustment Method:
1. Connect a distortion meter to TP7 (L-ch) or TP8 (R-ch) on the
RX board.
2. Adjust the L606 (L-ch) or L605 (R-ch) so as to minimize the
reading on the distortion meter.
L-ch
L606
Minimum
R-ch
L605
Minimum
FM RF
signal generator
Carrier frequency : 2.8 MHz
Modulation
: 1 kHz, 16 kHz deviation
Output level
: 34 dB
µ
V (EMF)
RX board
SIG
TP1 (GND)
0.1
µ
F
10 k
Ω
RX board
+
level meter
TP8 (R-ch)
Mute ON Position Adjustment
Preparation:
Connection:
Adjustment Method:
1. Connect a level meter to TP8 (R-ch) on the RX board.
2. Short between TP2 and TP3 on the RX board.
3. Write down the reading on the level meter at this time.
4. Remove the short between TP2 and TP3 made in item 2.
5. Adjust the RV601 on the RX board so that the reading on the
level meter is 5 dB to 10 dB below the value written down in
item 3.
