Brother Z-8550A Service Manual page 122

14. TROUBLESHOOTING
Problem
12 Incorrect thread trimming
(8560A)
(Upper and lower threads
are both not being
trimmed)
13 Incorrect thread trimming
(8560A)
(Upper thread or lower
thread is not being
trimmed)
14 The thread wiper does not
wipe the thread. (8560A)
15 Oil gauge (1) is not visible
in oil gauge window.
16 Machine does not operate
at high speed.
17 Machine stops during
sewing.
18 Nothing appears on the
operation panel display.
19 "GrEASEUP" flashes on
the operation panel when
the power is turned on.
113
• 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.
• 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".
• Is the length of thread trailing from the needle hole too long after
thread trimming?
Adjust the upper thread feeding device.
• Is the oil tank empty?
Fill the oil tank with oil.
2195M
• Is the sewing speed setting or backtack speed setting incorrect?
Use the sewing speed control keys to set the high speed.
• 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.)
• Is the operation panel
connector 8P inside the control
box disconnected?
Insert the connector securely.
• This display is to notify you that it is time to apply grease.
Apply grease.
Possible cause
Z-8550A, 8560A
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Instruction
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Instruction
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3558M
85