Sony HCD-M90 Service Manual page 19

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Syscon Diagnosis
The same contents as board detail check by serial interface can be
checked from the remote commander.
On the Test Mode Menu screen, press the
commander, and the following Check Menu will be displayed.
### Syscon Diagnosis ###
Check Menu
0. Quit
1. All
2. Version
3. Peripheral
4. Servo
5. Supply
6. AV Decoder
7. Video
8. Audio
_
0. Quit
Quit the Syscon Diagnosis and return to the Test Mode Menu.
1. All
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 judgment
through a visual check to the result, the following screen is displayed
for the key entry.
### Syscon Diagnosis ###
Diag All Check
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L 13942296513
No. 2 Version
2-2. Revision
ROM Revision = 1070
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
to go to the next item, or the
check again. To quit the Syscon Diagnosis and return to the Check
Menu screen, press the
commander. If an error occurred, the diagnosis is suspended and
the error code is displayed as shown below.
### Syscon Diagnosis ###
3-2. EEPROM Check
Error 03: EEPROM Write/Reed N
Address : 00000001
Write Data : 2492
Read Data : 2490
Press NEXT Key to Continue
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Press PREV Key to Repeat
_
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Selecting 2 and subsequent items calls the submenu screen of each
item. 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
_
2. Version
(2-2) Revision
ROM revision number is displayed.
Error: Not detected.
The revision number defined in the source file of ROM
(IC108) is displayed with four digits.
(2-3) ROM Check Sum
Check sum is calculated.
Error: Not detected.
The 8-bit data are added at addresses 0x000F0000 to
0x002EFFFF of ROM (IC108) and the result is displayed
with 4-digit hexadecimal number. Compare the result with
the specified value.
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3 6 7 1 3 1 5
(2-4) Model Type
Model code is displayed.
Error: Not detected.
The model code read from EEPROM (IC101) 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.
3. Peripheral
key
(3-2) EEPROM Check
Data write → read, and accord check
Error 03: EEPROM write/read discord
Data 0x9249, 0x2942, 0x4294 are written to addresses
0x00~0xFF of EEPROM (IC101), then read and checked.
Before writing, the data are saved, then after checking, they
are written to restore the contents of EEPROM.
4. Servo
(4-2) Servo DSP Check
Data write → read, and accord check
Error 12: Read data discord
Data 0x9249, 0x2942, 0x4294 are written to the address
0x602 of RAM in the servo DSP (IC302), then read and
checked.
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HCD-M90
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