Yamaha RX-V681 Service Manual page 51

C1-5. FPGA RAM
SDRAM (IC53)ʼs reading/writing are checked
C1-6. DIR BUS
Communication and bus line connection between microprocessor (IC90) and DIR (IC942) are checked.
C1-7. DSP BUS
Communication and bus line connection between microprocessor (IC90) and DSP1 (IC931)/DSP2 (IC932) are
checked.
C1-8. EEPROM
EEPROM (IC82)ʼs reading is checked.
C1-9. INVALID ITEM
Not for service.
C1-10. INVALID ITEM
Not for service.
C1-11. INVALID ITEM
Not for service.
C1-5
FPGA_RAM:OK
OK: No error detected
NG: An error is detected
C1-6
DIR B:OK
OK: No error detected
NG: An error is detected
C1-7
OK: No error detected
DSP B:OK,OK
NG: An error is detected
DSP1 DSP2
C1-8
EEPROM:OK
OK: No error detected
NG: An error is detected
C1-9
INVALID ITEM
C1-10
INVALID ITEM
C1-11
INVALID ITEM
RX-V681/RX-A760
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