– 17 –
MD-M3/M1
SO301
Electronic
voltmeter
Speaker
Terminal
UNIT
FM signal oscillator
Since this CD system incorporates the following automatic
adjustment functions, readjustment is not needed when
replacing the pickup. Therefore, different PWBs and pickups
can be combined freely.
Each time a disc is changed, these adjustments are
performed automatically. Therefore, playback of each disc
can be performed under optimum conditions.
Items adjusted automatically
(1) Offset adjustment (The offset voltage between the head
amplifieroutput and the VREF reference voltage is
compensated inside the IC.)
* Focus offset adjustment
* Tracking offset adjustment
(2) Tracking balance adjustment (waveform drawing 17-4
EFBL)
(3) Gain adjustment (The gain is compensated inside the IC
sothat the loop gain at the gain crossover frequency will
be 0dB.)
* Focus gain adjustment
* Tracking gain adjustment
• Adjustment
Figure 17-4
CD SECTION
T
T
EFBL
FDO
TE
Stopped
CH1=500mV
DC 10:1
CH2=200mV
DC 10:1
CH3=1V
DC 10:1
500ms/div
(500ms/div)
NORM:20kS/s
1
2
3
=Record Length=
Smoothing : ON
CH1 : 0.000V
CH2 : 0.000V
Main : 100K
Zoom : 2k
Mode : SINGLE
Type : EDGE CH1
Delay : 0.0ns
Hold off : 0.2us
CH3 : 0.00V
CH4 : 0.00V
BW : FULL
=Trigger=
=Filter=
=Offset=
CH2
v/DIV
200mV
1999/04/05 20:26:47
GND
AM Loop Antenna
Loop Antenna
Electronic
voltmeter
IF : Speaker Terminal
Freqency cover: IC302,Pin 20
UNIT
FM signal oscillator
ADJUSTMENT
fL: Low-range frequency
fH: High-range frequency
• AM adjustment and confirmation
Figure 17-1 AM IF
TUNER SECTION
Adjusting item
Adjusting object
Adjusting
method
IF
Adjust the indication of Set IF waveform
T351 set to 1,720 kHz. 450 kHz to maximum.
Frequency cover
fL: T306 (530 kHz)
fL: 1.1
±
0.1 V
(VT line voltage of
Adjust the indication
fH: 8.0
±
1.3 V of
pin 20 of IC302)
of set to 530 kHz.
(Only confirmation)
fH: (1,720 kHz)
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 MHz
25 dB
VR351
Input: SO301
Output: Speaker
Terminal
FM signal oscillator Frequency 1 kHz, 40 kHz
Adjusting object
Figure 17-2 FM Mute Level
• Erasing the registered broadcast station
When the power is off, press and hold the TUNER button and
the STOP button, and then press the POWER button.
All the registered stations are erased.
T306
VR351
T351
IC302
POWER/TUNER PWB
IC303
T302
FE301
AM IF
AM Tracking
AM Band Coverge
FM Mute Lebel
20
SO301
Antenna Terminal
Figure 17-3 ADJUSTMENT POINT
Содержание CP-M1
Страница 74: ...MD M3 M1 74 MEMO ...