Brother International MD-817 Service Manual - Page 39

Checking, Motor

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CHECKING THE MOTOR 1 Motor Motor M Approx. 1.2 ohm Torque thermister Black Blac Blue 6 3 5 2 Coil Approx. 0.3 ohm 4 Red Yellow Black Yellow Revolution thermister 1. Remove the motor cord (6P connector) from the connector part of the control box. 2. Measure with a tester set in the resistance range as follows. • If the tester reads approx. 2-3ohms in any position between 4 (red) and 6 (black) with the resistance range x 1, it is normal. It should read approx. 2-3ohms in each position while turning the motor pulley slowly. If it reads approx. 10ohms or more in some positions, it is out of order. However, if the pointer swings to much while turning the motor pulley, be sure to measure after stopping the pulley. • If the tester reads approx. 5K-40Kohms when measured at any position between 3 (black) and 6 (black) with the resistance range x 1, it is normal. • If the tester reads approx. 5K-40Kohms when measured at any position between 1 (yellow) and 2 (yellow) with the resistance range x 1, it is normal. ❑2 Brake Brake coil approx. 8 ohm 2 1 1. Remove the brake cord (2P connector) from the connector part of the control box. 2. Measure with the tester set in the resistance range as follows. • If the tester reads approx. 7-9ohms when measured at any po- sition between 1 (black) and 2 (black) with the resistance range x 1, it is normal. - 35 -

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CHECKING
THE
MOTOR
1
Motor
Torque
Black
thermister
Blac
Motor
Black
6
Blue
3
Coil
5
2
M
4
Yellow
Approx.
Red
Approx.
1.2
ohm
0.3
ohm
Yellow
Revolution
thermister
❑2
Brake
2
1
Brake
coil
approx.
8
ohm
1.
Remove
the
motor
cord
(6P
connector)
from
the
connector
part
of
the
control
box.
2.
Measure
with
a
tester
set
in
the
resistance
range
as
follows.
•
If
the
tester
reads
approx.
2-3ohms
in
any
position
between
4
(red)
and
6
(black)
with
the
resistance
range
x
1,
it
is
normal.
It
should
read
approx.
2-3ohms
in
each
position
while
turning
the
motor
pulley
slowly.
If
it
reads
approx.
10ohms
or
more
in
some
positions,
it
is
out
of
order.
However,
if
the
pointer
swings
to
much
while
turning
the
motor
pulley,
be
sure
to
measure
after
stopping
the
pulley.
•
If
the
tester
reads
approx.
5K-40Kohms
when
measured
at
any
position
between
3
(black)
and
6
(black)
with
the
resistance
range
x
1,
it
is
normal.
•
If
the
tester
reads
approx.
5K-40Kohms
when
measured
at
any
position
between
1
(yellow)
and
2
(yellow)
with
the
resistance
range
x
1,
it
is
normal.
1.
Remove
the
brake
cord
(2P
connector)
from
the
connector
part
of
the
control
box.
2.
Measure
with
the
tester
set
in
the
resistance
range
as
follows.
•
If
the
tester
reads
approx.
7-9ohms
when
measured
at
any
po-
sition
between
1
(black)
and
2
(black)
with
the
resistance
range
x
1,
it
is
normal.
-
35
-