Denon DRA-F107 - 3. System Connector(DENON BUS) dont work

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DRA-F107 / DRA-F107DAB
3. System Connector(DENON BUS) don't work
Check Power Supply Voltages for DENON BUS Check Soldering.
INPUT B'D DENON BUS BLOCK N.G INPUT B'D DENON BUS BLOCK
䊶 [WF31䈁:13pin ST5V 䊶 [WF31䈁:13pin ST5V
MAIN B'D
䊶 [WN31䈁:13pin ST5V
䊶 Q613
䊶䈀BN96䈁:1pin ST6V
䊶 D607
䊶 SUB TRANS B'D
O.K.
Check Control Signal for DENON BUS Check Soldering.
INPUT B'D DENON BUS BLOCK N.G INPUT B'D DENON BUS BLOCK
䊶 [WF31䈁:9pin BUS CLK,10pin BUS RXD_O 䊶 JK31
11pin BUS TXD_O OK? 䊶 Q301,Q302
䊶 [WF31] 9,10,11pin
MAIN B'D
[WN31] 9,10,11pin
IC31
[IC21]:26,27,28 pin
O.K.
END
4. The Key Operation don't work
Check Signal for KEY Check Soldering.
MAIN B'D N.G 䊶 WF81,S801䌾S809,VR81,VR82 on FRONT B'D
䊶 [IC62]3,5pin F_JOG±,21,22 VJOG± 䊶 WN81,IC62 in MAIN B'D
䇭17pin PWR_KEY,93,95pin Key 0/1 OK?
O.K.
END
5. The Remote Control Operation don't work
Check Signal for Remote Control Check Soldering.
䊶䌛IC62䌝:73pin REMOTE on MAIN B'D N.G 䊶 WF81on FRONT B'D
䊶䌛RC81䌝:3pin Vcc 3.3V OK? 䊶 WN81,IC62 in MAIN B'D
O.K.
END