Adjustment - Sharp MD-X60 Service Manual

MD-X60
TUNER SECTION
fL: Low-range frequency
fH: High-renge frequency
• AM adjustment and confirmation
AM signal oscillator Frequency 400 Hz, 30%, AM modulation
Adjusting item Adjusting object
IF Adjust the indication of Set IF wafeform
T351 set to 1,720 kHz. 450 kHz to maximum.
Frequency cover fL: T306 (530 kHz)
(VT line voltage of Adjust the indication
pin 20 of IC302) of set to 522 kHz.
Tracking fL: T302 (990 kHz)
• FM mute level adjustment
FM signal oscillator Frequency 400 Hz, 22.5 kHz
Frequency Adjusting
method
98 MHz 30 dB
AM Loop Antenna
IF : Speaker Terminal
Freqency cover: IC302,Pin 20
FM signal oscillator
Loop Antenna
Figure 16-1 AM IF

ADJUSTMENT

Adjusting
method
fL: 1.1 ± 0.1 V
fH: 5.1 ± 1.3 V of
(Only confirmation)
Set the output of
speaker terminal
to maximum.
Adjusting
Adjusting object
object
VR351 Input: SO301
Output: Speaker
Terminal
Electronic
voltmeter
UNIT
GND
T306
T302
AM Tracking
Figure 16-3 Adjustment Point
• 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 16. Call the setting with the
PRESET button to use it for tuner circuit adjustment or
confirmation.
Preset No. Frequency
P01 87.5 MHz
P02 108.0 MHz
P03 90.0 MHz
P04 106.0 MHz
P05 98.0 MHz
Table 16 Initial setting of memory
• Erasing the registered broadcast station
Holding down TRACK EDIT and ENTER in power-off state,
press POWER.
All the registered stations are erased.
Note:
Even when the RESET switch provided at the rear side of this
model, is pressed, the preset of tuner is not cleared.
SO301
FM signal oscillator
Figure 16-2 FM Mute Level
TUNER PWB
T351
AM IF
VR351
FM Mute Level
AM Band Coverge
13 12
20
1
SO301
Antenna Terminal
– 16 –
Preset No. Frequency
P06 530 kHz
P07 1,720 kHz
P08 600 kHz
P09 1,400 kHz
P10 990 kHz
Electronic
Speaker
voltmeter
Terminal
UNIT