Bernina B 570 - Foot Control; Upper Thread Observer (UTO)

BERNINA International AG Seestrasse 161 CH-8266 Steckborn Schweiz Seite 134 von 172
DRAFT – VERSION
4d Foot control
Is used to check foot control function
Check:
• Select test 4d.
• Slowly press foot control down as far as stop. The
position is reflected on the bar.
• Heel-kicking the foot control will light up the needle
stop up/down icon.
• To return to section 4, press or .
Repair note:
• Check foot control cable for deformation and/or wear and tear and loose contacts.
• Check foot control ceramic plate and spring-mounted carbon pin holder for correct fitting
and functioning.
• Replace PCBA-Base (see 4.2.4
).
4f Upper Thread Observer (UTO)
Is used to check upper thread observer function
Check:
• Select test 4f.
• Insert thread loop from below into the thread tension
unit up to the regulator spring.
• Move regulator spring with thread loop up and down.
• With the thread, move regulator spring up and down.
• The color of the bar changes to green.
• To return to section 4, press or .
Repair note:
• Check regulator spring for damage (bent or broken).
• Check if regulator spring is connected with actuating lug (see 4.3.18.1
).
• Check if regulator spring is properly set (see 5.11).
• Check cables for deformation and/or wear and tear.
• Replace PCBA-RET (see 4.2.8
).
• Replace PCBA-Base (see 4.2.4).