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XL-R910SL
Troubleshooting
Power supply / VFD (FL display) section
When trouble is found in the power supply and the FL display.
Check voltage
pin No13,14,18,46,72 of
UIC1 front PCB
: 5V(VDD)
Yes
Check oscillation
of UX1(6MHz) at front
PCB
Yes
Check voltage
pin No46 of UIC1
:-30V?
Yes
Check voltage
between 1 and 2, between
48 and 49 of VFD1
:AC4V?
Yes
Replace micom ,VFD1
1-6
No
Check voltage
output of RIC1(7805)
:5V?
Yes
Check connector (UCW1)
front PCB to main PCB
Check voltage
No
pin No27(p.sense)
of UIC1 : 5V
Yes
Replace UX1,SC4,
SC5,UIC1
Check voltage
No
negative of RC9
(100uF/500V)
:-30V?
Yes
Check connector(UCW1)
from front PCB to main PCB
No
-Check connector of UCW1
-Check for RCW1,PFU1/PFU2
No
Check voltage
input of RIC1(7805)
:8V?
Yes
Replace RIC1
Check for RC7,RD5,RD6,RD7,RD8,
Check voltage
No
output of RIC3(78L05) at
main PCB : 5V?
Yes
Check for UCW1(8P),
SR3,UC7,UD1,UQ1,UC6,UR2
Check voltage
No
negative of RC8
(100uF/100V)
:-42V?
Yes
Check for RR6,RZD5,
RZD6,RR7,RZD7
Check voltage
No
No
positive of RC7(6800uF/25V)
at main PCB : 12V?
Yes
Replace RQ4,
RZD4,RR5
RFU3,RCW1,PFU1/PFU2
Check voltage
No
No
positive of MC1(10uF/50V)
:15V?
Yes
Replace RIC3
Check for MC1,MR1,MD1,
RCW1,RFU3,PFU1/PFU2
No
Check for RC8,RD9,RR9
RCW1,PFU1/PFU2
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