Owner's Manual

Z-8550A, 8560A
15. TROUBLESHOOTING
78
Problem Possible cause Page
12 Incorrect thread trimming
(8560A)
(Upper and lower threads
are both not being
trimmed)
• Is the fixed knife or movable knife damaged or worn?
Replace the fixed knife or the movable knife.
• Is the thread trimming timing correct?
Adjust the rotating direction of the thread trimming cam.
55*
68*
13 Incorrect thread trimming
(8560A)
(Upper thread or lower
thread is not being
trimmed)
• Is the needle properly installed?
If it is incorrect, install the needle correctly.
• Is the fixed knife or movable knife blunt?
Replace the fixed knife or the movable knife.
• Do skipped stitches occur during sewing?
Refer to “Skipped stitches during sewing”.
15
55*
77*
14 The thread wiper does not
wipe the thread. (8560A)
• Is the length of thread trailing from the needle hole too long after
thread trimming?
Adjust the upper thread feeding device.
69*
15 Oil gauge (1) is not visible
in oil gauge window.
• Is the oil tank empty?
Fill the oil tank with oil.
9
16 Machine does not operate
at high speed.
• Is the sewing speed setting or backtack speed setting incorrect?
Use the sewing speed control keys to set the high speed.
22
17 Machine stops during
sewing.
• Is the fixed stitch key turned on?
Press the fixed stitch key so that the indicator turns off.
• Is the power supply voltage too low?
Check the power supply.
(If the power cord is too long or too many appliances are being
run from a single outlet, this may cause voltage drops which will
in turn cause the reset function to activate and stop the
machine, even if the power supply itself is normal.)
37
*
18 Nothing appears on the
operation panel display.
• Is the operation panel
connector 8P inside the control
box disconnected?
Insert the connector securely.
11*
19 “GREASEUP” flashes on
the operation panel when
the power is turned on.
• This display is to notify you that it is time to apply grease.
Apply grease.
52
2195M
3558M