DV-620 (serv.man12). Complete - Sharp DVD Service Manual (repair manual). Page 13

 Test Mode

A power source is put, and a playback key and a stop key are pushed after the "NO DISC" display at the same
time. (It keeps pushing it for about three seconds.)

ROM Renewal Mode

A power source is put with pushing a playback key and a halt key at the same time.
(It keeps pushing it for about three seconds.)

The preparation date display of the program

10000000  

∗∗∗∗∗∗∗∗

                                                   (Last updata)

Model number display

10000001  00007604

                                               (Model number)

The version display of the program

10000002  

∗∗∗∗∗∗∗∗

                                                 (Program ver.)

Reagion number display

10000003  00000008

                          (Region code:Binary display)

Color bar display

20000001  00000000 (FIP)

Micro-code number display

10000004  

∗∗∗∗∗∗∗∗

                                               (Microcode ver.)

The preparation date display of the servo program

10000005  

∗∗∗∗∗∗∗∗

                                                      (Servo ver.)

It is returned to the test mode initial image plane.

<The "2" key of the remote controller is pushed.>

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

Test mode initial image plane

F0000000  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.

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

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

"Playback" key

Servo DSP  Microcode version

10000006  

∗∗∗∗∗∗∗∗

It is returned to the test mode initial image plane.

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

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

There is no copy guard signal.
As for the symptom when it was 
dubbed in the video tape recorder?

Color bar display

20000002  00000000 (FIP)

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

AGC only
As for the symptom when it was 
dubbed in the video tape recorder?

Color bar display

20000003  00000000 (FIP)

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

AGC+Color stripe1
As for the symptom when it was 
dubbed in the video tape recorder?

AGC+Color stripe2
As for the symptom when it was 
dubbed in the video tape recorder?

Color bar display

20000003  00000000 (FIP)

To (1)

The all FIPs burning

40000000  00000000 (OSD only)

<The "4" key of the remote controller is pushed.>

<"3" key input>

The "4" key of the remote controller is pushed.

Model name   Model number
DV-750

00007503

DV-750TK

00007503

Model name Reagion cord
DV-750

00000004

DV-750TK

00000004

Micro-code is the thing of the process 
program of the system integrated circuit.