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45
HCD-M700
Press the DVD
x
“R” button to end the diagnosis. Press the
DVD
.
“R” button to re-check the error ocurrence point. Press
the DVD
>
“R” button to contine check after the error occurrence
point.
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
_
0. Quit
Quit the submenu and return to the Main Menu.
2. Version
(2-2) Revision
ROM revision number is displayed.
Error: Not detected.
The revision number defined in the source file of ROM
(IC107 or 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 (IC107 or IC108) and the result is
displayed with 4-digit hexadecimal number. Compare the
result with the specified value.
(2-4) Model Type
Model code is displayed.
Error: Not detected.
The model code read is displayed with 2-digit hexadecimal
number.
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.
(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
(IC401). If mechanical deck is connected, the motor and
optical pick-up 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 “R” on the remote commander. The test is
conducted only when the input data accord. Check the out-
put level, then press the DVD
>
“R” on the remote
commander to finish the test. This test is skipped if “All” is
selected.
Supplement: How to disconnect mechanical deck
Disconnect flat cables connected to the CN009 and CN010
of DVD board. Also, disconnect harness from the CN402.
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 (IC302) and external RAM (IC303) using check data.
If mechanical deck is connected, the motor and optical
pick-up 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 CN009 and
CN010 of DVD board. Also, disconnect harness from
the CN402.
(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 (ad-
dress 0xC6) in ARP (IC302), then they are read and checked.
(5-3) ARP to RAM Data Bus
Data write
→
read, and accord check
Error 09: ARP
↔
RAM data bus error
Data 0x0001 to 0x8000 where one bit each is set to 1 are
written to the address 0 of RAM (IC303) connected to the
ARP (IC302) through the bus, then they are read and
checked. In case of discord, written bit pattern and read
data are displayed. If data where multiple bits are 1 are
read, the bits concerned may touch each other. Further, if
data where certain bit is always 1 or 0 regardless of written
data, the line could be disconnected or shorted.
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