Service manual

– 15 –
MD-X8
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 530 kHz
P02 108.0 MHz P07 1,720 kHz
P03 90.0 MHz P08 600 kHz
P04 106.0 MHz P09 1,400 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 1,720 kHz.
450 kHz to maximum.
Frequency cover fL: T302 (530 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 530 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
121
AM IF
T302
FE301
IC302
JK501
ANALOG
IN/OUT
SO301
ANTENNA
TERMINAL
VR351
T351
AM TRACKING
AM BAND
COVERAGE
FM MUTE
LEVEL
MAIN PWB