Sharp CD-M10000W Service Manual page 14

CD-M10000W/CP-M10000
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Frequency Frequency
Test Stage
Display
AM IF 450 kHz 1,602 kHz
AM Band — 531 kHz
Coverage
AM Tracking 990 kHz 990 kHz
*1. Input: Antenna Output: TP302
*2. Input: Antenna Output: TP301
SO301
FM ANTENNA
TERMINAL
IC301
TP301 T302
C393
FM IF
T301
FM BAND
COVERAGE fL
T351
AM IF
Figure 14-1 ADJUSTMENT POINTS
CD SECTION
• Adjustment
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
amplifier output and the VREF reference voltage is
compensated inside the IC.)
* Focus offset adjustment
* Tracking offset adjustment
(2) Tracking balance adjustment (waveform drawing
Fig. 14-2 EFBL)
(3) Gain adjustment (The gain is compensated inside the IC
so that the loop gain at the gain crossover frequency will
be 0 dB.)
* Focus gain adjustment
* Tracking gain adjustment
All manuals and user guides at all-guides.com
Setting/ Instrument
Adjusting
Connection
Parts
T351 *1
(fL): T306 *2
1.1 ± 0.1 V
(fL): T303 *1
CNP301
AM LOOP
MAIN PWB
ANTENNA
T303
AM
TRACKING fL
L312
T306
FM RF
AM BAND
COVERAGE fL
TP302
R357
• FM RF
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Test Stage Frequency Frequency
FM Band —
Coverage
FM RF 98.00 MHz 98.00 MHz
(10-30 dB)
*1. Input: Antenna Output: TP301
*2. Input: Antenna Output: Speaker terminal
• FM IF
Signal generator: 10.7 MHz, FM modulated
Test Stage Frequency Frequency
IF 10.7 MHz
*1. Input: Antenna Output: TP301
T
Stopped
CH1=500 mV CH2=200 mV
DC 10:1 DC 10:1
T
FDO
1
TE
3
EFBL
2
=Filter= =Offset=
Smoothing : ON CH1 : 0.000 V
BW : FULL CH2 : 0.000 V
CH3 : 0.00 V
CH4 : 0.00 V
– 14 –
Setting/ Instrument
Display Adjusting
Connection
Point
87.50 MHz T301(fL): *1
3.4 V ± 50 mV
L312 *2
Setting/
Instrument
Display Adjusting Connection
Point
98 MHz T302 *1
(Turn the
core of trans-
former T302
fully counter-
clock wise)
1999/04/05 20:26:47
CH3=1 V
500 ms/div
DC 10:1 (500 ms/div)
NORM:20 kS/s
CH2
v/DIV
200 mV
=Record Length= =Trigger=
Main : 100 K Mode : SINGLE
Zoom : 2 k Type : EDGE CH1
Delay : 0.0 ns
0.2 µs
Hold off :
Figure 14-2