HCD-WZ8D, MHC-WZ8D - Sony Audio Service Manual (repair manual). Page 16

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• 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 displayed.
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 below.

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-WZ8D)

>

.

>

.

0-2-5. Region

Model destination code is displayed. (2 digits number)

0-3-1. Sampling Check

EEPROM check at every 64 words.
It compares read data with write data of each address. When
there are discrepancies between two data, it displays error.

0-3-2. Detail Check

EEPROM check at every 1 word.
It compares read data with write data of each address. When
there are discrepancies between two data, it displays error.

Pull up/down setting check of the DVD system processor (IC207)
pin 150, 151 and 154 (for clock setting port).

SD bus data check between DVD decoder (IC701) and D-RAM
(IC706).

Output the color bars for video level adjustment.

On the Test Mode Menu screen, press the 

[1]

 key on the remote

commander, and the Adjustment Menu will be displayed.

## Drive Auto Adjustment ##

Adjustment Menu

 0. ALL

 1. DVD-SL

 2. CD

 3. DVD-DL

Exit: RETURN

Normally, 

[10/0]

 is selected to adjust DVD (single layer), CD and

DVD (dual layer) in this order. But, individual items can be adjusted
for the case where adjustment is suspended due to an error. In this
mode, the adjustment can be made easily through the operation
following the message displayed on the screen.
The disc used for adjustment must be the one specified for
adjustment.

Press the 

[10/0]

 key on the remote commander, and the servo set

data in EEPROM will be initialized. Then, 1. DVD-SL disc, 2. CD
disc and 3. DVD-DL disc are adjusted in this order.
Each time one disc was adjusted, it is ejected. Replace it with the
specified disc following the message. You can finish the adjustment
by pressing the 

[RETURN]

 button on the remote commander.

During adjustment of each disc, the measurement for disc type judg-
ment is made. As automatic adjustment does not judge the disc
type unlike conventional models, take care not to insert wrong type
discs. Also, do not give a shock during adjustment.