Brother International MD-817 Service Manual - Page 40

Checking, Machine, Solenoids

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CHECKING THE MACHINE SOLENOIDS M Solenoid load of the machine Connector from the machine head Reverse switch 9 ® GND ® 8 5 0 Reverse solenoid Thread wiper solenoid Thread trimming solenoid (B737) Presser foot lift connecter Solenoid = GND 4 6 Presser foot lift switch 1. Remove the load connector (12P connector) of the machine from the connector part of the control box. 2. Measure with the tester set in the resistance range x 1 as follows. • The thread trimming solenoid at pins 4 and 5 is normal if the tester reads approx. 7ohms. • The thread wiper solenoid at pins 7 and 8 is normal if the tester reads approx. 5ohms. • ' The actuator at pins 9 and 12 is normal if the tester reads Oohms when pressed, and 000hms when released. • The presser lift solenoid at pins 1 and 4 is normal if the tester reads approx. 5ohms. • The presser lift switch at pins 2 and 5 is normal if the tester reads Oohms when pressed, and 000hms when released. - 36 -

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CHECKING
THE
MACHINE
SOLENOIDS
M
Solenoid
load
of
the
machine
Connector
from
the
machine
head
Presser
foot
lift
connecter
Reverse
switch
Solenoid
Reverse
solenoid
9
8
®
®
5
GND
0
Thread
wiper
Thread
trimming
solenoid
solenoid
(B737)
4
Presser
foot
lift
switch
6
=
GND
1.
Remove
the
load
connector
(12P
connector)
of
the
machine
from
the
connector
part
of
the
control
box.
2.
Measure
with
the
tester
set
in
the
resistance
range
x
1
as
follows.
<Machine
Head>
•
The
thread
trimming
solenoid
at
pins
4
and
5
is
normal
if
the
tester
reads
approx.
7ohms.
•
The
thread
wiper
solenoid
at
pins
7
and
8
is
normal
if
the
tester
reads
approx.
5ohms.
•
'
The
actuator
at
pins
9
and
12
is
normal
if
the
tester
reads
Oohms
when
pressed,
and
000hms
when
released.
<Presser
Lift>
•
The
presser
lift
solenoid
at
pins
1
and
4
is
normal
if
the
tester
reads
approx.
5ohms.
•
The
presser
lift
switch
at
pins
2
and
5
is
normal
if
the
tester
reads
Oohms
when
pressed,
and
000hms
when
released.
-
36
-