Tuner Section; Cd Section; Items Adjusted Automatically; Cd Error Code Description - Sharp CD-BK2100V Service Manual

TUNER SECTION

fL: Low-range frequency
fH: High-range frequency
AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Test Stage Frequency
AM IF 450 kHz
AM Band —
Coverage
AM Tracking 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.
13-2 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
Frequency Setting/
Instrument
Display Adjusting
Connection
Parts
1,602 kHz T351 *1
531 kHz (fL): T306 *2
1.1 0.1 V
990 kHz (fL): T303 *1
1
IC302
FM BAND
COVERAGE fL
Figure 13-1 ADJUSTMENT POINTS
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
CNP302
AM LOOP
SO302
ANTENNA
FM ANTENNA
20
TP301
L312
T302
T301
FM IF
1
T351
AM IF
Stopped
T
1
3
2
Smoothing : ON
BW : FULL

CD ERROR CODE DESCRIPTION

Error
[Servo System Error]
0001 Cannot detect Pickup-in SW
0002 DSP access error
[Error during close operation]
0101 Open/Close SW not functioning (Low
0103 Open/Close SW not functioning (High
[Error during open operation]
0201 Open/Close SW not functioning (Low
0203 Open/Close SW not functioning (High
[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.
0307 Clamp SW not function (Low
0308 Clamp SW not function (High
– 13 –
Setting/
Display Adjusting
87.50 MHz T301(fL);
1.3 V
L312
1
T303
AM
TRACKING fL
T306
AM BAND
COVERAGE fL
TP302
R357
T
CH1=500mV CH2=200mV CH3=1V
DC 10:1
DC 10:1 DC 10:1
FDO
TE
EFBL
=Filter= =Offset= =Record Length=
CH1 : 0.000V Main : 100K Mode : SINGLE
CH2 : 0.000V Zoom : 2k Type : EDGE CH1
CH3 : 0.00V Delay :
Hold off :
CH4 : 0.00V
Figure 13-2
State Code
CD-BK2100V
Instrument
Connection
Point
*1
50 mV
*2
1999/04/05 20:26:47
500ms/div
(500ms/div)
NORM:20kS/s
CH2
v/DIV
200mV
=Trigger=
0.0ns
0.2 s
High)
Low)
High)
Low)
High)
Low)