Yamaha RX-Z9 Service Manual page 57

"xxxxx" represents details of the error point in YSS930 #0-
#7 expressed in hexadecimal.
<1st byte>
Check result of address bus between YSS930 and SRAM
<2nd byte>
Check result of data bus between YSS930 and SRAM
<3rd byte>
Check result of connecting line between YSS930 and YSS930
Check result of address bus/data bus between YSS930 and
SRAM
When "xx" is converted into binary, "1" appears where there
is an error.
1st bit: IC4 data bus check result (0=OK / 1=NG)
2nd bit: IC8 data bus check result (0=OK / 1=NG)
3rd bit: IC12 data bus check result (0=OK / 1=NG)
4th bit: IC16 data bus check result (0=OK / 1=NG)
5th bit: IC2 data bus check result (0=OK / 1=NG)
6th bit: IC6 data bus check result (0=OK / 1=NG)
7th bit: IC10 data bus check result (0=OK / 1=NG)
8th bit: IC14 data bus check result (0=OK / 1=NG)
xx in binary
"xx" value
The value of "xx" can be any of all patterns from 00 to FF depending on the combination of NG points.
Example: When IC10, IC8 and IC4 are NG
12.PCB CHECK
YSS:NGxxxxxx
Check result of address bus/data bus between YSS930 and SRAM
xx=43 (Binary: 0100_0011)
Display indicating existence of an error: NGxxxxx
3rd byte
2nd byte
1st byte
RX-Z9/DSP-Z9
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