Sharp CD-BK260V Service Manual page 14

CD-BK260V/CD-BK2700V/CD-BK280V
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
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
• FM RF
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Test Stage
FM Band
Setting/ Instrument
Coverage
Adjusting
Connection
FM RF
Parts
T351 *1
*1. Input: Antenna
(fL): T306 *2
1.1 ± 0.1 V
*2. Input: Antenna
(fL): T303 *1
CNP301
SO302
AM LOOP
FM ANTENNA
ANTENNA
TERMINAL
IC301
T302
FM IF
T301
FM BAND
COVERAGE fL
T351
AM IF
Figure 14-1 ADJUSTMENT POINTS
CD ERROR CODE DESCRIPTION
– 14 –
Frequency Frequency
Display
— 87.50 MHz
98.00 MHz 98.00 MHz
(10-30 dB)
Output: TP301
Output: Speaker terminal
MAIN PWB
T303
AM
TRACKING fL
R316
L312
TP301
T306
FM RF
AM BAND
COVERAGE fL
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 14-2
Setting/ Instrument
Adjusting
Connection
Point
T301(fL): *1
1.3 V ± 50 mV
L312 *2
1999/04/05 20:26:47
500 ms/div
(500 ms/div)
NORM:20 kS/s
CH2
v/DIV
200 mV
=Trigger=
100K Mode : SINGLE
2k Type : EDGE CH1
Delay : 0.0 ns
0.2 µs
Hold off :