– 15 –
MD-X8H
ADJUSTMENT
fL: Low-range frequency
fH: High-renge frequency
• AM adjustment and confirmation
Figure 15-1 AM IF
TUNER SECTION
• TEST mode setting method
Holding down the ENTER button and TUNER (BAND) button,
turn on the power. Frequency is set in the memory (initial
setting) as shown in Table 15. Call the setting with the
PRESET button to use it for tuner circuit adjustment or
confirmation.
Preset No.
Frequency
P01
87.5 MHz
P06
522 kHz
P02
108.0 MHz
P07
1,620 kHz
P03
90.0 MHz
P08
603 kHz
P04
106.0 MHz
P09
1,404 kHz
P05
98.0 MHz
P10
990 kHz
Figure 15-3 ADJUSTMENT POINTS
Adjusting item
Adjusting object
Adjusting
method
IF
Adjust the indication of Set IF wafeform
T351 set to 1,620 kHz. 450 kHz to maximum.
Frequency cover
fL: T302 (522 kHz)
fL: 1.1
±
0.1 V
(VT line voltage of
Adjust the indication
fH: 5.1
±
1.3 V of
pin 20 of IC302)
of set to 522 kHz.
(Only confirmation)
Tracking
fL: T302 (990 kHz)
Set the output of
speaker terminal
to maximum.
AM signal oscillator Frequency 400 Hz, 30%, AM modulation
• FM mute level adjustment
Frequency
Adjusting
object
Adjusting
method
98.0 MHz
28 dB
VR351
Input: SO301
Output: Speaker
Terminal
FM signal oscillator Frequency 400 Hz, 22.5 kHz
Adjusting object
Preset No.
Frequency
Figure 15-2 FM Mute Level
Table 15 Initial setting of memory
Electronic
voltmeter
GND
AM Loop Antenna
AM signal oscillator
Loop Antenna
UNIT
IF : Speaker Terminal
Frequency cover: IC302, pin 20
Electronic
voltmeter
UNIT
FM signal oscillator
SO301
Speaker
Terminal
20
13
12
1
AM IF
T302
FE301
IC302
JK501
ANALOG
IN/OUT
SO301
FM
ANTENNA
TERMINAL
VR351
T351
AM TRACKING
AM BAND
COVERAGE
FM MUTE
LEVEL
MAIN PWB
CNP301
AM
ANTENNA
TERMINAL
Содержание MD-X7H
Страница 28: ...MD X7H MEMO 18 ...
Страница 29: ...MD X7H MEMO 19 ...