DV-L70 (serv.man4). Test modes - Sharp DVD Service Manual (repair manual). Page 2

Mecah test mode display

3000E000  EEEEEEEE

<Disk is put, and the "2" key of the remote controller is pushed.>

*It is usually returned in power source off for the state.

<The "3" key of the remote controller is pushed.>

<The "1" key of the remote controller is pushed.>

When it failed in servo initialization.
It is returned to the test mode initial image plane
 by pushing "the playback" of the remote 
controller and a "stop" key at the same time.

Laser test mode display

0D000100  00000000

The "playback" key of the remote controller is pushed.

A playback key and a stop key are pushed at 
the same time, and it is returned to the test mode 
initial image plane.

DVD mode (Light is sent out by DVD laser, 

and a pickup is moved to the circumference.)

DD000100  00000000

The "playback" key of the remote controller is pushed.

CD mode (Light is sent out by CD laser, 

and a pickup is moved to the circumference.)

CD000100  00000000

The "playback" key of the remote controller is pushed.

The emission of the laser can be confirmed when 
a disk cover is opened and a cap switch is 
pushed with the thin bar and so on.
Note:Not to face the light of the laser squarely, 
        caution!

Slead motor is rotated, and it moves a pickup to 
the circumference.

Laser off mode (Light isn't sent out by laser, 

and a pickup is moved to the circumference.)

FD000100  00000000

The "playback" key of the remote controller is pushed.

The "playback" key of the remote controller is pushed.

The "playback" key of the remote controller is pushed.

It is returned to the cause in power source off.
How to distinguish a difference in the DVD laser 
and the CD laser.
DVD laser is lighter in comparison with the CD laser.
Note:Not to face the light of the laser squarely, 
        caution!

From (1)

To (2)

Mecah test mode display

30000000  00000000

DDT mode

0D000100  00000000

DDT step 1

DD000201  

∗∗

++--00

DDT mode

0D00E201  000000EE

When a disk is not in.

It is executed to focus on of DDT.
Focus offset value(

∗∗

)

Track offset value(++)
0 layer focus balance value(--)

The "playback" key of the remote controller is pushed.

DDT step 2

DD000202  

∗∗

++0000

A track, slead on are done after RF gain outline adjustment and track balance adjustment are done.
0 layer RF gain value(

∗∗

)

Track balance value(++)
0 layer focus balance value

The "playback" key of the remote controller is pushed.

DDT step 3

DD000203  

∗∗

++0000

Just focus adjustment is done.
RF gain adjustment is done again after the completion.
0 layer focus balance value(

∗∗

)

Track RF gain value(++)

The "playback" key of the remote controller is pushed.

DDT step 4

DD000204  

∗∗

000000

Focus gain adjustment is done.
0 layer focus gain value(

∗∗

)

The "playback" key of the remote controller is pushed.

DDT step 5

DD000205  

∗∗

000000

Track gain adjustment is done.
Track gain value(

∗∗

)

DDT step 6

DD000206  

∗∗

++0000 (DVD)

DD000206  00000000 (CD)

A two-layer disk does just focus of layer 1 and focus gain adjustment.
A CD does reading of TOC.
1 layer focus gain value(

∗∗

)

1 layer focus balance value(++)