(5-4) ARP to RAM Address Bus6. AV Decoder
Data write ? other address read discord check(6-2) 1930 RAM
Error 10: ARP ? RAM address bus errorData write ? read, and accord check
Caution: Address and data display in case of an error isError 13: AVD RAM read data discord
different from the display of other diagnosis (de-The program code data stored in ROM (IC104) are copied
scribed later).to all areas of RAM (IC504, IC505) connected to the AVD
Before starting the test, all addresses of RAM (IC303) are(IC502) through the bus, then they are read and checked if
cleared to 0x0000.they accord. Further, the same test is conducted once again
First, 0xA55A is written to the address 0x00000, and thewith the data where all bits are inverted between 1 and 0. If
address data are read and checked from addresses 0x00001discord is detected, faulty address, written data, and read
to 0x80000 while shifting 1 bit each. Next, the data at thadata are displayed ftollowing the error code 13, and the test
address is cleared, and it is written to the address 0x00001,is suspended.
and read and checked in the same manner. This check is
repeated up to the address 0x80000 while shifting the ad-(6-3) 1930 SP
dress data by 1 bit each.ROM ? AVD RAM ? Video OUT
If data other than 0 is read at the addresses except wrError: Not detected.itten
address, an error is given because all addresses werThe data including sub picture al-e streams in ROM (IC104)
ready cleared to 0. In this check, the error display pattern isare transferred to the RAM (IC504, IC505) in AVD (IC502),
different from that of other diagnosis; read data,and output as video signals from the writtenAVD (IC502).
address, and read address are displayed in this orderThey ar. Hoe output frw-om all video terminals (Composite, Y/C,
ever, the message uses same template, and accordingly eComponent).x-
change Address and Data when reading. The following dis-
play, for example,7. Video
(7-2) Color Bar
### Syscon Diagnosis ###
AVD color bar command write ? Video OUT
Error: Not detected.
The command is transferred to the AVD, and the color bar
signals are output from video terminals.
5-4. ARP to RAM Address BusThey are output from all video terminals (Composite, Y/C,
Error 10: ARP - RAM Address BComponent)
Address: 0000A55A
Write Data : 00000000
8. Audio
Read Data : 00080000
(8-2) ARP ? 1930
Press NEXT Key to Continue
Error14 : ARP ? 1930 video NG
Press PREV Key to Repeat
15 : ARP ? 1930 audio NG
_
(8-3) Test Tone
shows the data 0xA55A was read from address 0x00080000
A pink noise signal is output from the AVD (IC502) through
though it was written to the address 0x00000000. This im-
optical coaxial digital terminal and analog audio terminal.
plies that these addresses are in the form of shadow. Also,
Error: Not detected.
if the read data is not 0xA55A, another error will be present.
All channels ? 2ch Left ? 2ch Right ? Front Left ?
Front Right ? Rear Left ? Rear Right ? Center ? Sub
(5-5) ARP RAM Check
Woofer are checked in this order.
Data write ? read, and accord check
Caution: Sub Woofer is checked only for low-frequency
Error 11: ARP RAM read data discord
components, and no sound will be heard unless a
The program code data stored in ROM are copied to all
proper super woofer is connected.
areas of RAM (IC303) connected to the ARP (IC302)
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.
6-3 |
ACEC
SONY
