Sony DVP NS725P - Progressive-Scan DVD/CD Player, Service Manual

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6-2
*In "All item continuous check", pressing step or enter will not
quit the diagrosis.
Selecting
2
and subsequent items calls the submenu screen of
each item. When “–––––” is displayed in the submenu, it means
that the test is not supported in the model.
For example, if “5. Supply” is selected, the following submenu
will be displayed.
### Syscon Diagnosis ###
Check Menu
No. 5 Supply
0. Quit
1. All
2. ARP Register Check
3. ARP to RAM Data Bus
4. ARP to RAM Address Bus
5. ARP RAM Check
_
0. Quit
Quit the submenu and return to the main menu.
1. (All submenu items continuous check.)
This menu checks 2 and subsequent items successively. At the
item where visual check is required for judgment or an error
occurred, the checking is suspended and the message is output
for key entry. Normally, all items are checked successively one
after another automatically unless an error is found.
Selecting
2 and subsequent items executes respective menus
and outputs the results.
For the contents of each submenu, see “General Description of
Checking Method” and “Check Items List”.
General Description of Checking Method
2. Version
(2-2) Revision
ROM revision number is displayed.
Error: Not detected.
The revision number defined in the source file is
displayed with four digits.
(2-3) ROM Check Sum
Check sum is calculated.
Error: Not detected.
8-bit data are added up to the ROM address 0x000F0000
to 0x002EFFFF, and the result is displayed with 4-digit
hexadecimal number. Error is not detected. Compare the
result with the specified value.
(2-4) Model Type
Model code is displayed.
Error: Not detected.
The model code read from the EEPROM is displayed
with 2-digit hexadecimal number.
(2-5) Region
Region code is displayed.
Error: Not detected.
The region code determined from the model code is
displayed.
(2-6) M’t check
Mount resistance is checked.
Error 22: The region code does not accord.
Check wether the region code that is deduced from model
resistance and destination resistance accords with the
region code that is deduced from region resistance value.
3. Peripheral
(3-2) EEPROM Check
Data write t read, and accord check
Error 03: EEPROM write/read discord
0x9249, 0x2942 and 0x4294 are written to the address
0x00 to 0xFF of the EEPROM and then read for
checking. Before writing, the data are saved, then after
checking, they are written to restore the contents of
EEPROM.
(3-6) Venc Check (NS755V/NS915V)
Data write t read, and accord check
Error 52: Write and read data discord.
Accessing to the SYSCON may be defective.
(3-8) External RAM Check
Test Data write
t
read, and accord check
Error 02: The external RAM used in the system control is
checked.
To quit the diagnosis and return to the Check Menu screen,
press
x or
[ENTER]
key. If an error occurred, the diagnosis is
suspended and the error code is displayed as shown below.
### Syscon Diagnosis ###
3-3. EEPROM Check
Error 03: EEPROM Write/Read N
Address
: 00000001
Write Data : 2492
Read Data : 2490
Press NEXT Key to Continue
Press PREV Key to Repeat
_
Press x key to quit the diagnosis, or . key to repeat the
same item where an error occurred, or
>
key to continue the
check from the item next to faulty item.