5. Supply(5-5) ARP RAM Check
(5-2) ARP Register CheckData write ? read, and accord check
Data write ? read, and accord checkError 11: ARP RAM read data discord
Error 08: ARP register write, and read data discorThe progdram code data stored in ROM are copied to all
Data 0x00 to 0xFF is written sequentially to the ARP areas of RAM (IC303) connected to the TMAXARP (IC301)
register (address 0xC6) and then read for checking.through the bus, then they are read and checked if they ac-
cord. If the detail check was selected initially, the data are
(5-3) ARP to RAM Data Buswritten to all areas and read, then the same test is conducted
Data write ? read, and accord checkonce again with the data where all bits are inverted between
Error 09: ARP ?? RAM data bus error1 and 0. If discord is detected, faulty address, written data,
Data 0x0001 to 0x8000 where one bit each is set to 1 areand read data are displayed following the error code 11,
written to the address 0 of RAM (IC303) connected to theand the test is suspended.
ARP (IC301) through the bus, then they are read and
checked. In case of discord, written bit pattern and read6. AV Decoder
data are displayed. If data where multiple bits are 1 are
read, the bits concerned may touch each other. Further, if(6-2) 1935 RAM
Data write ? read, and accord check
data where certain bit is always 1 or 0 regardless of writtenError 14: AVD RAM read data discord
data, the line could be disconnected or shorted.The program code data stored in ROM (IC106 or 107) are
(5-4) ARP to RAM Address Buscopied to all areas of RAM (IC404, IC406) connected to
the AVD (IC403) through the bus, then they are read and
Data write ? other address read discord checkchecked if they accord. Further, the same test is conducted
Error 10: ARP ?? RAM address bus erroronce again with the data where all bits are inverted between
Caution: Address and data display in case of an error is
different from the display of other diagnosis (de-1 and 0. If discord is detected, faulty address, written data,
and read data are displayed following the error code 14,
scribed later).and the test is suspended.
Before starting the test, all addresses of RAM (IC303) areDuring the test, OSD display becomes blank as the OSD
cleared to 0x0000.
First, 0xA55A is written to the address 0x00000, and thearea is also checked.
address data are read and checked from addresses 0x00001(6-3) 1935 SP
to 0x80000 while shifting 1 bit each. Next, the data at thatROM ? AVD RAM ? Video OUT
address is cleared, and it is written to the address 0x00001,
and read and checked in the same manner. This check isError: Not detected.
The data including sub picture streams in ROM (IC106 or
repeated up to the address 0x80000 while shifting the ad-IC107) are transferred to the RAM (IC404, IC406) in AVD
dress data by 1 bit each.(IC403), and output as video signals from the AVD (IC403).
If data other than 0 is read at the addresses except written
address, an error is given because all addresses were al-Though OSD display becomes blank, the output of video
signals continues until the key is pressed.
ready cleared to 0. In this check, the error display pattern is They are output from all video terminals (Composite, Y/
different from that of other diagnosis; read data, writtenC, Component) except EURO AV terminal.
address, and read address are displayed in this order. How-
ever, the message uses same template, and accordingly ex-
change Address and Data when reading. The following dis-
play, for example,
### Syscon Diagnosis ###
5-4. ARP to RAM Address Bus
Error 10: ARP - RAM Address B
Address: 0000A55A
Write Data : 00000000
Read Data : 00080000
Press NEXT Key to Continue
Press PREV Key to Repeat
_
shows the data 0xA55A was read from address 0x00080000
though it was written to the address 0x00000000. This im-
plies that these addresses are in the form of shadow. Also,
if the read data is not 0xA55A, another error will be present.
6-3 |
ACEC
