(5-4) ARP to RAM Address Bus6. AV Decoder
Data write ? other address read discord check
Error 10: ARP? RAM address bus error (6-2) 1930 RAM
Caution: Address and data display in case of an error isData write ? read, and accord check
different from the display of other diagnosis (de-Error 13: AVD RAM read data discord
scribed later).The program code data stored in ROM (IC205) are copied
Before starting the test, all addresses of RAM (IC304) areto all areas of RAM (IC402, IC403) connected to the AVD
cleared to 0x0000.(IC401) through the bus, then they are read and checked if
First, 0xA55A is written to the address 0x00000, and thethey accord. Further, the same test is conducted once again
address data are read and checked from addresses 0x00001with the data where all bits are inverted between 1 and 0. If
to 0x80000 while shifting 1 bit each. Next, the data at thatdiscord is detected, faulty address, written data, and read
address is cleared, and it is written to the address 0x00001,data are displayed following the error code 13, and the test
and read and checked in the same manner. This check isis suspended.
repeated up to the address 0x80000 while shifting the ad-
dress data by 1 bit each.(6-3) 1930 SP
If data other than 0 is read at the addresses except writtenROM ? AVD RAM ? Video OUT
address, an error is given because all addresses were al-Error: Not detected.
ready cleared to 0. In this check, the error display pattern isThe data including sub picture streams in ROM (IC205)
different from that of other diagnosis; read data, writtenare transferred to the RAM (IC402, IC403) in AVD (IC401),
address, and read address are displayed in this orderand output as video signals from the . How-AVD (IC401).
ever, the message uses same template, and accordingly ex-They are output from all video terminals (Composite, Y/C).
change Address and Data when reading. The following dis-
play, for example,7. Video
### Syscon Diagnosis ###
(7-2) Color Bar
AVD color bar command write ? Video OUT
Error: Not detected.
The command is transferred to the AVD, and the color bar
5-4. ARP to RAM Address Bussignals are output from video terminals.
Error 10: ARP - RAM Address BThey are output from all video terminals (Composite, Y/C).
Address: 0000A55A
Write Data : 000000008. Audio
Read Data : 00080000
Press NEXT Key to Continue(8-2) ARP ? 1930
Press PREV Key to RepeatError 14: ARP? 1930 video NG
_
15?: 1930 audio NGARP
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.
(5-5) ARP RAM Check
Data write ? read, and accord check
Error 11: ARP RAM read data discord
The program code data stored in ROM are copied to all
areas of RAM (IC304) connected to the ARP (IC303)
through the bus, then they are read and checked if they ac-
cord. If the detail check was selected initially, the data are
written to all areas and read, then the same test is conducted
once again with the data where all bits are inverted between
1 and 0. If discord is detected, faulty address, written data,
and read data are displayed following the error code 11,
and the test is suspended.
10 |
ACEC
