10. TROUBLESHOOTING
RH-9820
225
10. TROUBLESHOOTING
•
If there is a problem with operation, first check that the threads are correctly threaded and that the needle is correctly
installed.
•
Please check the following points before calling for repairs or service.
•
If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of
purchase.
CAUTION
Turn off the power switch and disconnect the power cord before carrying out troubleshooting.
Otherwise the machine may operate if the start switch is pressed by mistake, which could result in serious injury.
Problem Cause
Remedy
Page
Thread tension is too strong.
Adjust the thread tension to the correct
tension.
Instruction
manual
Needle is not installed correctly.
Install the needle so that it faces
correctly.
Instruction
manual
Thread is too thick for the needle.
Select a thread which is suitable for the
needle.
Instruction
manual
Needle and looper adjustment is
incorrect.
Adjust the clearance between the
needle and looper, the needle bar height
or the looper and spreader height.
141, 148
149
Needle, looper, spreader, throat plate or
thread path is damaged.
Repair or replace the respective part(s).
Thread breaks
Thread is not threaded correctly.
Thread the thread correctly.
Instruction
manual
Upper thread tension is too strong or too
weak.
Adjust the upper thread tension to the
correct tension.
Instruction
manual
Needle point is broken or bent.
Replace with a new needle.
Clearance between needle and looper
tip is incorrect.
Adjust the clearance between the
needle and looper tip.
149
Needle, looper and spreader adjustment
is incorrect.
Adjust correctly.
141
146 - 151
Needle and needle guard adjustment is
incorrect.
Adjust the needle guard.
149
Eye looper tip is blunt.
Repair with an oilstone or replace the
looper with a new one.
Needle is not installed correctly.
Install the needle so that it faces
correctly.
Instruction
manual
Skipped stitches occur.
Needle is too thin.
Select a needle that is suitable for the
sewing conditions.
Instruction
manual
Summary of Contents for RH-9820
Page 7: ...RH 9820 v Belt cover Rear 0331B 0332B 0334B 0486B 0485B 0333B ...
Page 46: ...4 MECHANICAL DESCRIPTIONS RH 9820 37 ...
Page 58: ...5 DISASSEMBLY RH 9820 49 5 10 Lubrication 1089B ...
Page 124: ...6 ASSEMBLY RH 9820 115 6 19 Covers 1064B ...
Page 210: ...8 ELECTRICAL MECHANISM 201 RH 9820 PMD P C board Power supply motor P C board 0693B 4593Q ...
Page 211: ...8 ELECTRICAL MECHANISM 202 RH 9820 Panel P C board 0694B ...
Page 217: ...8 ELECTRICAL MECHANISM 208 RH 9820 0761B ...
Page 218: ...8 ELECTRICAL MECHANISM 209 RH 9820 0762B ...
Page 236: ...SERVICE MANUAL RH 9820 I6100920B 2007 03 B 1 Printed in Japan ...