CD-BA160 (serv.man4). Part 1 - text - Sharp Audio Service Manual (repair manual). Page 15

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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.
               -Enter test mode.

C  D       T  E  S  T

OPEN/CLOSE operation is using manual.

<<

>>, <<

>> buttons make pick's slide possible.

Do TOC IL. Do normal play
When these following key is
input into PLAY key, track
number  can be appoint directly

<<PLAY>> key input.

<<MEMORY>> key input.

<<

1>> key: Track 4

<<

2>> key: Track 9

<<

3>> key: Track 15

<<STOP>> key input.

STOP

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

VOL — Last memory
BAL — CENTER
P.GEQ — FLAT
X-BASS — OFF

To cancel : Power OFF

Sliding the PICKUP with
<<

>>, <<

>> button

must only be in STOP mode.

[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.

0307

Clamp SW Low 

→ 

High not functioning

0308

Clamp SW High 

→

 Low not functioning

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.

(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

•

EFBL

FDO

TE

Stopped

IL isn't done

•