Adjustment - Sharp MD-MX30 Service Manual

MD-MX30/MX30W
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
fC: Center-range frequency
• AM adjustment and confirmation
AM signal oscillator Frequency 400 Hz, 30%, AM modulation
MD-MX30
Adjusting item
Adjusting object
IF Adjust the indication of Set IF waveform
T351 set to 1,720 kHz. 450 kHz to maximum.
Frequency cover fL: T306 (530 kHz)
(VT line voltage of Adjust the indication
TP301) of set to 530 kHz.
fH: (1,720 kHz)
Tracking fC: T302 (990 kHz)
MD-MX30W
Adjusting item Adjusting object
IF Adjust the indication of Set IF waveform
T351 set to 1,620 kHz. 450 kHz to maximum.
Frequency cover fL: T306 (522 kHz)
(VT line voltage of Adjust the indication
TP301) of set to 522 kHz.
fH: (1,620 kHz)
Tracking fC: T302 (990 kHz)
• FM mute level adjustment
MD-MX30:
FM signal oscillator Frequency 1 kHz, 67.5 kHz dev.
MD-MX30W:
FM signal oscillator Frequency 1 kHz, 40 kHz dev.
Frequency
Adjusting
method
98 MHz 26 dB(EMF)
SO301A
FM signal oscillator
Figure 20-2 FM Mute Level
• Erasing the registered broadcast station
When the power is off, press and hold the TUNER(BAND)
button and the MD STOP button, and then press the ON/
STAND-BY button.
All the registered stations are erased.
CD SECTION

• Adjustment

Since this CD system incorporates the automatic adjustment functions, readjustment is not needed when replacing the pickup.
Therefore, PWBs and pickups can be combined freely.
Each time a disc is changed, automatic adjustment is performed. Therefore, playback of each disc can be performed under
optimum conditions.
ADJUSTMENT
Adjusting
method
fL: 1.3 0.1 V
fH: 8.5 1.3 V
(Only confirmation)
Set the output of
speaker terminal
to maximum.
Adjusting
method
fL: 1.3 0.1 V
fH: 8.5 1.3 V
(Only confirmation)
Set the output of
speaker terminal
to maximum.
Adjusting
Adjusting object
object
VR351 Input: SO301B
Output: Speaker
Terminal
Electronic
voltmeter
Speaker Terminal
UNIT
• Setting the Test Mode
While holding down the TUNER(BAND) button and the MD
PLAY button, press the ON/STAND-BY button. Frequencies
are rewritten in memory as shown in table 18. Call them using
the JOG DIAL for tuner circuit adjustment and check.
Note that once you reinitialize the settings, the frequencies
recorded by users will be changed.
Preset No. Frequency
P01 87.5 MHz
P02 108.0 MHz
P03 90.0 MHz
P04 106.0 MHz
P05 98.0 MHz
AM Loop Antenna
AM signal oscillator
Figure 20-1 AM IF/Frequency Cover
TUNER PWB-A3
IC303
13
14
15
16
17
18
19
20
21
22
23
24
CF302
T306
OSC.AM
T302
AM ANT.
Figure 20-3 ADJUSTMENT POINT
– 20 –
Frequency Frequency
Preset No.
(MD-MX30) (MD-MX30W)
P06 530 kHz
P07 1,720 kHz 1,602 kHz
P08 600 kHz
P09 1,400 kHz 1,404 kHz
P10 990 kHz
Table 20
Electronic
IF:Speaker Terminal
voltmeter
Freqency cover:TP301
UNIT
GND
12
11
10
9
8
7 CF352
6
5
4
3
T351
2
1
AM IF
FM MUTE
LEVEL
VR351
TP301
IC302
12 11
13 10
FE301
14 9
15 8
16 7
17 6
18
5
19 4
20
3
21 2
22 1
SO301B
SO301A
ANTENNA TERMINAL
531 kHz
603 kHz
990 kHz