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XL-R910SL
Digital output
When trouble is found in the optical output and coaxial output.
Check signal
No
(digital) input pin No 1
of NIC1(74HCN04)
Yes
Check signal
No
(digital) output pin No 4,6
of NIC1(74HCU04)
Yes
Check voltage
No
pin No2 of NOM2
(optical transmitter)
:5V?
Yes
-Check for NEF1,NEF2,NR10,NR11,NR12
-Replace NOM2
-Check solder of between NOM2 and NJA1
-Check for optical cable and coaxial cable
1-8
Check signal
No
Check connector to NCW1(17P)
(digital) input pin No 15
of NCW1(17P)
Yes
Check for MR14,NC7
Check voltage
No
of NIC1(74HCU04)
pin No14:5V?
No7:0V?
Yes
Replace NIC1
Check mechanism
Check voltage
No
input of RIC2(78L05)
:8V?
Yes
Replace RIC2
Check for RC7,RD5,RD6,RD7,RD8,
RFU3(2.5A),RCW1,PFU1/PFU2
Check voltage
No
positive of RC7(6800uF/25v)
at main PCB : 12V?
Yes
Replace RQ3,
RZD3,RR3
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