FFS2000 Series Chapter 6: Fiber Preparation
Page 42 TTN047338-D02
Problem Possible Cause Solution
Cleave blade is dirty. Clean the cleave blade with a cotton swab
dipped in isopropanol.
Cleave tension is insufficient
(check for FHB slippage; see
above).
Increase the cleave tension.
Cleave blade height adjustment
may be required
Please contact Thorlabs for instructions.
The FHB cocks forward
when the cleave lever
is released.
The bottom of the FHB or the
plate where the FHB sits is dirty.
Scrub with toothbrush provided.
Cleave tension is too high. Reduce cleave tension.
Fiber slips through or
breaks in the V-groove.
Stripper/cleaver top or V-grooves
are dirty, or FHB V-grooves are
dirty.
Clean the top and V-grooves using the soft
brush or a cotton swab dipped in isopropanol.
Note: If the fiber breaks in the stripper/cleaver
block and enough fiber remains in the V-
groove, remove the broken piece and re-
cleave.
Blade doesn’t touch
one or both fibers.
Fiber not in V-groove. Ensure fiber is correctly located in the V-
groove.
Cleave blade height adjustment
may be required.
Please contact Thorlabs for instructions.
Bad cleave.
FHB not sliding Freely. The FHBs must move smoothly and freely for
the correct tension to be applied to the fiber. If
the FHBs have become contaminated it may
be necessary to strip down and rebuild them.
Please contact Thorlabs for assistance.
Cleave tension needs adjustment. Adjust the cleave tension.
Cleave blade may be damaged. Inspect blade for chips/cracks. See the
Maintenance Section for instructions to rotate
the blade 180° to expose a new blade edge.
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