Sony DVPC-X850D, Service Manual

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6-2
Selecting 2 and subsequent items executes respective menus and
outputs the results.
For the contents of each submenu, see “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 of ROM
(IC205) 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 ~
0x002EFFFF of ROM (IC205) 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 EEPROM (IC201) 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
(3-2) Gate Array Check
Data write
→
read, and accord check
Error 02: Gate array write/read discord
Data 0x00~0xFF are written to the address 0xF of GA
(IC601), then read and checked if they accord.
(3-3) 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 (IC201), then read and checked.
Before writing, the data are saved, then after checking, they
are written to restore the contents of EEPROM.
(3-4) NAND Flash Check
Data clear
→
write
→
read, and accord check
Error 04: Clear error
05: Write error
06: Read data discord
21: Faulty blocks exceed 10
The data clear, write, read, and check are executed to the
block 0 of Flash memory (IC602).
In case of a faulty block, its address is displayed.
An error is output if faulty blocks exceed 10.
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 (IC701), then read and
checked.
(4-3) DSP Driver Test
Test signal data
→
DSP Driver
Error: Not detected.
Caution: Do not conduct this test with a mechanical deck
connected.
The maximum voltage is applied to the Servo Driver IC
(IC801, IC802). If mechanical deck is connected, the motor
and optics could be damaged. Disconnect mechanical deck
following the output message, then enter specified 4- or 5-
digit number from the remote commander, and press the
ENTER . The test is conducted only when the input data
accord. Check the output level, then press the NEXT to
finish the test.
This test is skipped if “All” is selected.
Supplement: How to disconnect mechanical deck
Disconnect flat cables connected to the CN002 and CN003
of MB-85 board. Also, disconnect harness from the CN011.
5. Supply
Caution: Do not conduct this check with a mechanical deck
connected.
An access is made to the stream supply and servo control
IC (IC303) and external RAM (IC304) using check data.
If mechanical deck is connected, the motor and optics
could be damaged. This check is also executed by the “All”
menu item.
Supplement: How to disconnect mechanical deck Disconnect flat
cables connected to the CN002 and CN003 of MB-
85 board. Also, disconnect harness from the CN011.
(5-2) ARP Register Check
Data write
→
read, and accord check
Error 08: ARP register write, and read data discord
Data 0x00 to 0xFF are written to the TMAX register (address
0xC6) in ARP (IC303), then they are read and checked.