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Unicorn DB2-H515 User Manual

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Problem Cau se Check Solution Page
Needle thread
escapes at st art
of sewi ng.
Tension disc does not
open sufficiently.
Tension disc
opening
Adjust tension release.
Excessive pretension Adjust pretension. 13
Needle too heavy for
thread
Use smaller size
needle.
Up needle stop position
too high, thread removed
by thread take-up.
Thread take-up
height at up needle
stop position
Delay up needle stop
position timing.
Thread cutter
mechanis m does
not funct ion.
Thread cutter solenoid
dose not function.
Check with tester
Replace thread cutter
solenoid.
Thread cutter signal not
transmitted.
Check circuits; refer
to motor adjustment
manual
Thread wiper does
not funct ion.
Needle thread remainder
too long.
Adjust pretension 13
Excessive material,
presser foot resistance
Replace with presser
foot having back
channel.
Timing too early; wipes
thread before tension
disc closes.
Adjust timing.
Thread wiper operation
too short
Adjust operation time.
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Unicorn DB2-H515 Specifications

General IconGeneral
BrandUnicorn
ModelDB2-H515
CategorySewing Machine
LanguageEnglish

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