3M 250/900 - page 5

78-0013-6978-0-B

250 µm ﬁ ber

2.6 Close the funnel door and bow start door on the fiber

holder. Again ensure that the guide funnel is pushed

completely forward to the end of the fiber holder.

Pull the fiber back until the fiber tip is flush with

the end of the funnel. To verify the cleave length is

still correct, all coatings should align with the hole

located in the funnel. Close the back clamp.

Note: for semi-tight buffer ﬁ ber, the 250 µm coating

may protrude up to 1 mm past the 900 µm buffer. If

necessary, re-strip, clean and cleave the ﬁ ber to meet

length requirements.

Fiber coatings

2.7 Place fiber holder in assembly base and slowly slide

fiber holder forward, toward the connector.

Note: Allow 10 seconds for this movement from the

time the ﬁ ber begins to enter the boot on the connec-

tor until the ﬁ ber holder bottoms out in the assembly

base.

10 seconds or a rate of 3 mm/sec

Guide funnel door opened by

cam on the assembly base

Fiber bow should start when the white line on

fiber holder aligns with the “BOW START”

mark on the assembly base

2.8 While slowly sliding the fiber holder toward the

connector, a bow should start to form in the fiber

when the white line on the fiber holder aligns with

the white BOW START line on the assembly base.

If a bow is not seen, slide the fiber holder back. If

a bow is not seen, or if a bow is seen before the

two white lines meet, slide the fiber holder back.

Re-strip, clean and cleave the fiber, and begin the

termination process again.

Fiber bow

Release lever Guide funnel stops when

ear contacts release lever

No gap between fiber

holder and actuation

when fully inserted

No gap between fiber

2.9 Continue to slowly slide fiber holder towards

connector until it stops. Verify fiber bow again.

Note: The ﬁ ber will bow and lift the middle cover

for rigid ﬁ bers and remain closed for 250 µm and

especially ﬂ exible 900 µm ﬁ bers. This ensures proper

ﬁ ber insertion force.

Guide funnel

Place fiber tip here

Hole