~
Explanation of
connectors
If
the
machine
has
been disassembled
or
adjusted during repair work, most
of
the
machine troubles are
due
to
connector problems including improper connection
or
weak contact.
It
is,
therefore, necessary
to
check each connector number and
pin
contact
for
correct connection
prior
to
proceeding
to
the
, troubleshooting pro.cedures.
The table
below
lists
the
connector numbers and symptoms resulting
from
wrong
connections. For
detailed connector and harness arrangement, refer
to
page
90,
"CONTROL
CIRCUIT
BLOCK
DIAGRAM".
Connector
No.
and location
f
Contorol
PCB
l·
I I p 1 I
~
I
I p 3 I I
.
PMOPCB
.
I
Contoro
I
PCB
· I
I p 2 I I P13 I
I
[5nTT
LzLJ
gg
I P 8 I
I I
"Airvcslve
I
So~~~id
·I
II
'--------1
I
I
PMOPCB
I P 2 I
I I
,........_.._,,
,.....,.._~
I J 4 I I J s I
I
P4ll
Psl
I
I X·drive I I Y·drive, .
·j
~ulse
motor
I !pulse
motor
I
I
Motor
I
I
I
I
I
I
P3
I
Motor
PCB
p 2
I I
p 1
I I
I
I
I
I
Power
I
Contoro
I
PCB;
I
I P 8 I
rTIS
I
P 2 I
r
Synchronizer
1
1
I
I
Drive signals and source
Symptoms resulting from
wrong
connection
Control
power
source
• Abnormal motion
•
No
motion
Solenoid drive power source
Air
valve drive power source
•
Faulty
operation
of
the
work
clamp,
presser
foot,
thread
wiper
components,
thread
trimming
components
Pulse
motor
drive
power
•
source
•
Start/stop
control
currents
•
for
the machine •
+SV •
Needle stop position control,
synchronization control, and •
rotation control signals
•
-59-
Step
out
in X and Y
axes
Unusual noises
of
X-drive· and
Y-drive
pulse motors
Abnormal rotation
of
the machine
Stop operation failure
The
machine rotates
at
abnormally
high
speed, then stops. (Error No.2)
The
needle does
not
stop
at
the
correct
top-end position.
The
machine
rotates,
but
the
feed
mechanism does
not
work.
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