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Z-8550A, 8560A
14. TROUBLESHOOTING
113
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 incorrect?
Adjust the rotating direction of the thread trimming cam.
Instruction
manual
82
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”.
Instruction
manual
Instruction
manual
110
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.
84
15 Oil gauge (1) is not visible
in oil gauge window.
• Is the oil tank empty?
Fill the oil tank with oil.
Instruction
manual
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.
Instruction
manual
17 Machine stops during
sewing.
• Is the fixed stitch key turned on? (8560A)
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.)
Instruction
manual
18 Nothing appears on the
operation panel display.
• Is the operation panel
connector 8P inside the control
box disconnected?
Insert the connector securely.
Instruction
manual
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.
85
2195M
3558M