226 X75HD/X75SD Installation and Operation Manual
Appendix B: Troubleshooting
Solution 2
Some of the early X75 and X75-RCP units have experienced premature
failure of capacitor C38 (part # 101-000067-00; see Figure B-3 on
page 227) made by Vishay (part # VJ1210Y334J(K)XBAT). This
results in a blank VFD (Vacuum Florescent Display).
Obtain the serial number of the X75HD/X75SD unit and the original
PO number. Then contact Leitch customer support. The front control
panel assembly (part number 170-000483-00) will be exchanged free of
charge. No special programming or configuration is required.
The failure nature of this C38 capacitor is that it slowly builds up the
resistance in an inverse way that eventually shorts out the power line
supplying the power to the VFD. The resistance across this capacitor
should be more than several thousand ohms, but failed capacitors are
measured below several hundred ohms.
The VFD will function without this DC filtering capacitor. If your
situation is urgent, carefully remove or replace this capacitor. Follow
these steps to remove and replace the capacitor:
1. Pull the frame 2 inches from the rack and then remove a total of 14
screws from the top and bottom of the front panel assembly.
2. Detach the front panel from the chassis by gently pulling the panel
forward.
(There is a mating connector on the left side of the chassis.)
3. Remove and replace the defective capacitor.
See “Installing a Frame-Mounted Local Control Panel” on page 263 for
more details.
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