Sharp CD-BA250H Service Manual page 16

CD-BA250H/CD-BA2600H
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 1,620 kHz
AM Band — 522 kHz
Coverage
AM Tracking 990 kHz 990 kHz
*1. Input: Antenna Output: TP302
*2. Input: Antenna Output: TP301
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.16-2 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
• FM
Notes:
1: Description of the "FM IF Adjustment" is not carried on this
Setting/ Instrument
Adjusting
Connection
2: The parts in the FM front end section are prepared in a
Parts
T351 *1
(fL): T306 *2
1.1 ± 0.1 V
(fL): T303 *1
MAIN PWB
SO302 CNP302
FM AM LOOP
ANTENNA ANTENNA
FE301
T351
AM IF
Figure 16-1 ADJUSTMENT POINTS
CD ERROR CODE DESCRIPTION
– 16 –
Manual. It is because the IF coil in the FM front end section
has been best adjusted in the factory so that its further
adjustment is not needed at the field. When replacing the
FM front end assembly, no adjustment is needed either.
complete unit, so you can't obtain each part individually.
T303
AM
TRACKING fL
AM BAND
R336
COVERAGE fL
T306
TP301
TP302
R357
Error State Code
[Servo System Error]
0001 Cannot detect Pickup-in SW
0002 DSP access error
[Error during close operation]
Open/Close SW not functioning (Low → High)
0101
Open/Close SW not functioning (High → Low)
0103
[Error during open operation]
Open/Close SW not functioning (Low → High)
0201
Open/Close SW not functioning (High → Low)
0203
[Error during skip operation]
0302 Pickup-in SW is not detected
0306 During Disc 1 search, Open/Close SW or Clamp SW
or Disc SW do not change to low.
Clamp SW not function (Low → High)
0307
Clamp SW not function (High → Low)
0308
T
Stopped
CH1=500 mV CH2=200 mV CH3=1 V
DC 10:1 DC 10:1 DC 10:1
T
FDO
1
TE
3
EFBL
2
=Filter= =Offset= =Record Length=
Smoothing : ON CH1 : 0.000 V Main :
BW : FULL CH2 : 0.000 V Zoom :
CH3 : 0.00 V
CH4 : 0.00 V
Figure 16-2
1999/04/05 20:26:47
500 ms/div
(500 ms/div)
NORM:20 kS/s
CH2
v/DIV
200 mV
=Trigger=
100 K Mode : SINGLE
2 k Type : EDGE CH1
Delay : 0.0 ns
0.2 µs
Hold off :