HCD-GN88D - Sony Audio Service Manual (repair manual). Page 2

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The Test Mode allows you to make diagnosis and adjustment eas-
ily using the remote commander and monitor TV. The instructions,
diagnostic results, etc. are given on the on-screen display (OSD).

1.

Press the  

+/1

  button to turn the power on, and set the function

to DVD.

2.

While pressing the

x

and  

Z

  button, turn the 

[VOLUME]

knob clockwise to enter the test mode.

3.

It displays “SERVICE IN” on the liquid crystal display, and
displays the Test Mode Menu on the monitor screen as follows.
(At the bottom of the menu screen, the model name and revision
number are displayed)

Test Mode Menu

0. Syscon Diagnosis
1. Drive Auto Adjustment
2. Drive Manual Operation
3. Mecha Aging
4. Emergency History
5. Mecha Error History
6. Version Information
7. Video Level Adjustment

Exit: POWER Key

Model    :MHC-GN88D xx
Revision :x.xx

4.

To execute each function, select the desired menu and press its
number on the remote commander RM-SR246D.

5.

To release from test mode, press the  

+/1

  button and turn the

power off.

The same contents as board detail check by serial interface can be
checked from the remote commander operation.
On the Test Mode Menu screen, press 

[10/0]

 key on the remote

commander, and the following Check Menu will be displayed.

### Syscon Diagnosis ###

Check Menu

0. Quit
1. All
2. Version
3. EEPROM
4. GPIO
5. SD Bus
6. Video

Quit the Syscon Diagnosis and return to the Test Mode Menu.

This menu checks all diagnostic items continuously. Normally, all
items are checked successively one after another automatically
unless an error is found, but at a certain item that requires judg-
ment through a visual check to the result, the following screen is
displayed for the key entry.

• Example display

### Syscon Diagnosis ###

Diag All Check

No.2 Version

2-3. ROM Check Sum

Check Sum = xxxx

Press NEXT Key to Continue
Press PREV Key to Repeat

For the ROM Check, the check sum calculated by the Syscon is
output, and therefore you must compare it with the specified value
for confirmation.
Following the message, press the 

[NEXT        ]

 button to go to the

next item, or press the 

[        PREV]

 button to repeat the same

operation again.
To quit the diagnosis and return to Check Menu screen, press the

[RETURN]

 key on the remote commander to display Check Menu.

• Error occurred
If an error occurred, the diagnosis is suspended and error is dis-
played.
Press the 

[RETURN]

 key on the remote commander to quit the

diagnosis, or press the 

[         PREV]

 button to repeat the same

check where an error occurred, or press the 

[NEXT        ]

 button to

continue the check from the item next to faulty item.

Selecting 2 and subsequent items calls the submenu screen of each
item. And selecting 2 and subsequent items executes respective
menus and outputs the results.
For the contents of each submenu, see “Check Items List” as be-
low.

0-2. Version

0-2-1. All
0-2-2. Revision
0-2-3. ROM Check Sum
0-2-4. Model Type
0-2-5. Region

0-3. EEPROM Check

0-3-1. Sampling Check
0-3-2. Detail Check

0-4. GP I/O Check
0-5. SD Bus Check
0-6. Video Check

0-2-2. Revision

The revision number of ROM (IC206) that the program for
the DVD system processor (IC207) is stored.

0-2-3. ROM Check Sum

Check sum is calculated.
(4 digits hexadecimal number)

0-2-4. Model Type

Model name is displayed. (MHC-GN88D)

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