Test Mode - Sharp CD-BA160H Service Manual

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 15-1
EFBL)
(3) Gain adjustment (The gain is compensated inside the IC
so that the loop gain at the gain crossover frequency will
be 0dB.)
* Focus gain adjustment
* Tracking gain adjustment
T
Stopped
CH1=500mV CH2=200mV
DC 10:1 DC 10:1
T
FDO
1
TE
3
EFBL
2
=Filter= =Offset=
Smoothing : ON CH1 : 0.000V
BW : FULL CH2 : 0.000V
CH3 : 0.00V
CH4 : 0.00V
Figure 15-1
CD ERROR CODE DESCRIPTION
Error
[Servo System Error]
0001 Cannot detect Pickup-in SW
0002 DSP access error
[Error during close operation]
Open/Close SW Low → High not functioning
0101
Open/Close SW High → Low not functioning
0103
[Error during open operation]
Open/Close SW Low → High not functioning
0201
Open/Close SW High → Low not functioning
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 Low → High not functioning
0307
Clamp SW High → Low not functioning
0308
1999/04/05 20:26:47
CH3=1V 500ms/div
DC 10:1 (500ms/div)
NORM:20kS/s
CH2
v/DIV
200mV
=Record Length= =Trigger=
Main : 100K Mode : SINGLE
Zoom : 2k Type : EDGE CH1
Delay : 0.0ns
Hold off : 0.2us
State Code

TEST MODE

•
Setting the test mode
Any one of test mode can be set by pressing several keys as
fallows.
<X-BASS> + <CD> + <POWER> TEST:CD operation test
Function:-CD test mode.
C D
OPEN/CLOSE operation is using manual.
<< >>, << >> buttons make pick's slide possible.
<<PLAY>> key input.
Do TOC IL. Do normal play
When these following key is
input into PLAY key, track
number can be appoint directly
<< 1>> key: Track 4
<< 2>> key: Track 9
<< 3>> key: Track 15
<<STOP>> key input.
STOP
VOL — Last memory
BAL — CENTER
P.GEQ — FLAT
X-BASS — OFF
To cancel : Power OFF
– 15 –
CD-BA160H/1700H
-Enter test mode.
T E S T
<<MEMORY>> key input.
Laser ON.
<<MEMORY>> key input.
Tracking OFF play at that
specific point.
<<MEMORY>> key input.
Tracking ON play at that
specific point.
<<STOP>> key input.
STOP
Sliding the PICKUP with
<< >>, <<
must only be in STOP mode.
>> button