T-8421C, 8422C, 8452C, 8722C, 8752C
14. TROUBLESHOOTING
79
Problem Possible cause Page
13 Machine does not operate
at high speed.
y Is the sewing speed setting or backtack speed setting incorrect?
Use the sewing speed control keys to set the high speed.
28
14 Machine stops during
sewing.
y Is the fixed stitch key turned on?
Press the fixed stitch key so that the indicator turns off.
y 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.)
27
*
15 Nothing appears on the
operation panel display.
y Is the power supply connector
disconnected from the control
box?
Insert the connector
securely.
y Is operation panel connector
P7 inside the control box
disconnected?
Insert the connector
securely.
14
• 15
12*
16 “GrEASEUP” flashes on
the operation panel when
the power is turned on.
y This display is to notify you that it is time to apply grease.
Apply grease.
57*
4264M
2197B
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