Sony DVP-CX860 Service Manual page 92

1. All
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 au-
tomatically unless an error is found.
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
(IC106) is displayed with four digits.
(2-3) ROM Check Sum
Check sum is calculated.
Error: Not detected.
The data are added of ROM (IC106) and the result is dis-
played with 4-digit hexadecimal number. Error is not de-
tected. Compare the result with the specified value.
(2-4) Model Type
Model code is displayed.
Error: Not detected.
The model code is displayed with 2-digit hexadecimal num-
ber.
DVP-CX860 (US, CND)
DVP-CX860 (AEP, UK)
DVP-CX870D (US, CND)
(2-5) Region
Region code is displayed.
Error: Not detected.
The region code determined from the model code is dis-
played.
3. Peripheral
(3-2) EEPROM Check
Data write → read, and accord check
Error 03: EEPROM write/read discord
Before writing, the data are saved, then after checking, they
are written to restore the contents of EEPROM.
(3-3) Gate Array Check
Data write → read, and accord check
Error 02: Gate array write/read discord
4. Servo
(4-2) Servo DSP Check
Data write → read, and accord check
Error 12: Read data discord
(4-3) DSP Driver Test
Test signal data → DSP Driver
Error: Not detected.
5. Supply
Caution: Do not conduct this check with a mechanical deck con-
nected.
An access is made to the stream supply and servo con-
trol IC (IC302) and external RAM (IC303) 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
(5-2) ARP Register Check
Data write → read, and accord check
Error 08: ARP register write, and read data discord
(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
Model Type checked. In case of discord, written bit pattern and read
data are displayed. If data where multiple bits are 1 are
6 0
read, the bits concerned may touch each other. Further, if
6 3
data where certain bit is always 1 or 0 regardless of written
7 0
data, the line could be disconnected or shorted.
6-2
Disconnect flexible flat cables connected to the
CN201 and CN202 of MB-86 board. Also, discon-
nect flat cable from the CN401.