– 21 –
– 22 –
MW Auto Scan/Stop Level Adjustment
Setting:
[SOURCE]
n
[MODE]
button : AM (MDX-C7970)
MW (MDX-C7970R)
FREQUENCY SELECT switch : AM 10 k (E model)
Procedure:
1. Set to the test mode. (See page 18)
2. Push the
[SOURCE]
button and set to FM.
3. Push the
[MODE]
button and set to AM or MW.
Display
4. Adjust with the volume RV1 on TU1 so that the “AM” or “MW”
indication turns to “AM0” or “MW0” indication on the dis-
play window.
But, in case of alredy indicated “AM0” or “MW0”, turn the
RV1 so that put out light “0” indication and adjustment.
Display
*2: MDX-C7970R indicates “MW”.
*3: MDX-C7970R indicates “999”.
*4: Only MDX-C7970R indicates.
Adjustment Location: See page 22.
AM RF signal
generator
Carrier frequency : 1000 kHz (MDX-C7970)
999 kHz (MDX-C7970R)
30% amplitude
modulation by
1 kHz signal
Output level
: 33 dB (44.7
µ
V)
(50
Ω
)
set
AM dummy antenna
30
Ω
15 pF
65 pF
antenna jack (J1)
SHUF
TP
*3
*2
*4
SHUF
TP
*3
*2
*4
Adjustment Location:
– SET UPPER VIEW –
RV1 RDS S-Meter Adjustment (MDX-C7970R)
TU1
RV1 AM (MW) Auto Scan/Stop Level Adjustment
RV2 FM Auto Scan/Stop Level Adjustment
FM Stereo Separation Adjustment (MDX-C7970)
FM Stereo Separation Adjustment (Narrow) (MDX-C7970R)
RV3 FM Stereo Separation Adjustment (Wide) (MDX-C7970R)
RV4
Summary of Contents for MDX-C7970/C7970R
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Page 41: ... 61 4 20 SCHEMATIC DIAGRAM SUB Board MDX C7970 C7970R Page 54 Page 57 ...
Page 48: ... 68 6 IC700 X1 KEY Board 1 IC801 º OSC IN 5 8 Vp p 271 ns 2 8 Vp p 3 5 µs ...