Before starting the test, all addresses of RAM (IC303) are6. AV Decoder
cleared to 0x0000.(6-2) 1930 RAM
First, 0xA55A is written to the address 0x00000, and theData write ? read, and accord check
address data are read and checked from addresses 0x00001Error 13: AVD RAM read data discord
to 0x80000 while shifting 1 bit each. Next, the data at thaThe program code datta stored in ROM (IC104) are copied
address is cleared, and it is written to the address 0x00001,to all areas of RAM (IC504, IC505) connected to the AVD
and read and checked in the same manner. This check is(IC502) through the bus, then they are read and checked if
repeated up to the address 0x80000 while shifting the ad-they accord. Further, the same test is conducted once again
dress data by 1 bit each.with the data where all bits are inverted between 1 and 0. If
If data other than 0 is read at the addresses except wrdiscord is detected, fittenaulty address, written data, and read
address, an error is given because all addresses were al-data are displayed following the error code 13, and the test
ready cleared to 0. In this check, the error display pattern isis suspended.
different from that of other diagnosis; read data, written
address, and read address are displayed in this order(6-3) 1930 SP. How-
ever, the message uses same template, and accordingly eROM ? AxVD -RAM ? Video OUT
change Address and Data when reading. The following dis-Error: Not detected.
play, for example,The data including sub picture streams in ROM (IC104)
are transferred to the RAM (IC504, IC505) in AVD (IC502),
### Syscon Diagnosis ###and output as video signals from the AVD (IC502).
They are output from all video terminals (Composite, Y/C,
Component) except EURO AV terminal.
5-4. ARP to RAM Address Bus7. Video
Error 10: ARP - RAM Address B(7-2) Color Bar
Address: 0000A55AAVD color bar command write ? Video OUT
Write Data : 00000000Error: Not detected.
Read Data : 00080000The command is transferred to the AVD, and the color bar
Press NEXT Key to Continue
Press PREV Key to Repeatsignals are output from video terminals.
_They are output from all video terminals (Composite, Y/C,
Component) except EURO AV terminal.
shows the data 0xA55A was read from address 0x00080000
though it was written to the address 0x00000000. This im-(7-3) Composite Out
EURO-AV Composite video output check
plies that these addresses are in the form of shadow. Also,
if the read data is not 0xA55A, another error will be present.AVD color bar command write ? Video (EURO-AV Com-
posite) OUT
Error: Not detected.
(5-5) ARP RAM Check
Data write ? read, and accord checkWith the Component of video output turned off, the color
bar signals are output from the EURO-AV terminal.
Error 11: ARP RAM read data discord
The program code data stored in ROM are copied to all
areas of RAM (IC303) connected to the ARP (IC302)(7-4) Y/C Out
EURO-AV Y/C video output check
through the bus, then they are read and checked if they ac-
cord. If the detail check was selected initially, the data areAVD color bar command wr? Vite ideo (EURO-AV Y/C)
written to all areas and read, then the same test is conductedOUT
Error: Not detected.
once again with the data where all bits are inverted between
1 and 0. If discord is detected, faulty address, written data,With the Y/C of video output turned on, the color bar sig-
nals are output from the EURO-AV terminal.
and read data are displayed following the error code 11,
and the test is suspended.
(7-5) RGB Out
EURO-AV RGB video output check
AVD color bar command write ? Video (EURO-AV RGB)
OUT
Error: Not detected.
With the RGB of video output turned on, the color bar sig-
nals are output from the EURO-AV terminal.
(7-6) Component Out
EURO-AV Component video output check
AVD color bar command write ? Video (EURO-AV Com-
ponent) OUT
Error: Not detected.
With the Component of video output turned on, the color
bar signals are output from the EURO-AV terminal.
(7-7) Euro AV Through
Euro-AV2 input check.
Check video and audio signal pass through from Euro-AV2
to Euro-AV1.
Error: Not detected.
6-3 |
ACEC
SONY
