Bus Dsp1; Eeprom; Rs-232C Loopback Test - Yamaha RX-V767 Service Manual

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RX-V767/HTR-7063/RX-A800
C1-7. BUS DSP1
Communication and bus line connection
between microprocessor (IC908) and DSP1
(IC45) are checked.
OK
: No error detected
NG : An error is detected
C1-8. EEPROM
The Read check of EEPROM (IC903) are
executed.
OK
: No error detected
NG : An error is detected
C1-9. RS-232C LOOPBACK TEST
(RX-A800 model)
Transmission of the RS-232C terminal is checked.
"OK" appears when the data is transmitted
properly and "NG" when it is not.
With the power to this unit turned off, short
between pins No. 2 (RxD) and No. 3 (TxD) of
the RS-232C terminal.
(Be sure to turn off the power when shorting the
pins.)
Start up the self-diagnostic function and select
this menu.
C1-10. INVALID ITEM
Not for service.
46
C1-7.  BUS DSP1
C 1 - 7
D S P 1   B U S : O K
C1-8.  EEPROM
C 1 - 8
E E P R O M : O K
C1-9.  RS-232C LOOPBACK TEST
C 1 - 9
2 3 2 C   D A T A : O K
RS-232C terminal
9
8
7
6
5
4
3
2
1
TxD
RxD
C1-10. INVALID ITEM
C 1 - 1 0
I N V A L I D   I T E M
マ イ コ ン(IC908) と DSP1(IC45) の 通 信・
バスラインの接続をチェックします。
OK  :不良検出なし
NG  :不良検出あり
EEPROM (IC903) の読み出しをチェックします。
OK  :不良検出なし
NG  :不良検出あり
サービスでは使用しません。
サービスでは使用しません。

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