Read Sharp CD-BA1200 (serv.man6) Service Manual online
CD-BA1200H
– 14 –
CD SECTION
•
AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
*1. Input: Antenna
Output: TP302
*2. Input: Antenna
Output: TP301
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
fH: High-range frequency
AM IF
450 kHz
1,620 kHz
T351
*1
AM Band
—
522 kHz
(fL): T306
*2
Coverage
1.1
±
0.1 V
AM Tracking 990 kHz
990 kHz
(fL): T303
*1
Figure 14-1 ADJUSTMENT POINTS
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
T306
T303
R357
TP301
TP302
T351
AM IF
AM
TRACKING fL
TRACKING fL
AM BAND
COVERAGE fL
COVERAGE fL
FE301
SO301
FM ANTENNA
TERMINAL
FM ANTENNA
TERMINAL
CNP302
AM LOOP
ANTENNA
AM LOOP
ANTENNA
MAIN PWB
1
R381
Figure 14-2
CD ERROR CODE DESCRIPTION
Error
State Code
[Servo System Error]
0001
Cannot detect Pickup-in SW
0002
DSP access error
[Error during close operation]
0101
Open/Close SW Low
→
High not functioning
0103
Open/Close SW High
→
Low not functioning
[Error during open operation]
0201
Open/Close SW Low
→
High not functioning
0203
Open/Close SW High
→
Low not functioning
[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.
or Disc SW do not change to low.
0307
Clamp SW Low
→
High not functioning
0308
Clamp SW High
→
Low not functioning
Items adjusted automatically
(1) Offset adjustment (The offset voltage between the head
amplifier output and the VREF reference voltage is
compensated inside the IC.)
compensated inside the IC.)
* Focus offset adjustment
* Tracking 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 0dB.)
be 0dB.)
* Focus gain adjustment
* Tracking gain adjustment
* Tracking gain adjustment
• Adjustment
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
CH2 : 0.000V
Main : 100K
Zoom : 2k
Zoom : 2k
Mode : SINGLE
Type : EDGE CH1
Delay : 0.0ns
Hold off : 0.2us
Type : EDGE CH1
Delay : 0.0ns
Hold off : 0.2us
CH3 : 0.00V
CH4 : 0.00V
CH4 : 0.00V
BW : FULL
=Trigger=
=Filter=
=Offset=
CH2
v/DIV
200mV
v/DIV
200mV
1999/04/05 20:26:47
• FM
Notes:
1: Description of the "FM IF Adjustment" is not carried on this
Notes:
1: Description of the "FM IF Adjustment" is not carried on this
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.
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.
2: The parts in the FM front end section are prepared in a
complete unit, so you can't obtain each part individually
