Brother International MD-817 Service Manual - Page 59

continuity test

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El Connector related • Fuse failure (#2, #3-7) • LED 1 illumination (#3) • LED 1 flashing (#5) Thread trimmer connector CN3 O g I I I I I I I ,0 Presser foot connector / Brake connector LED 1 (#3) O CD CN8 CN5 CN7 CN4 CN10 0 \ 0 0 8A fuse CN6 O Power-supply connector Motor connector,-- cocci 000 000 0 a 0 a Fuses PTR, D: OK #1 0. TRM check methods 1. Remove the three M5 screws 0 and four M4 screws 2. Set the tester to the X 152 range (0 ohm adjustment). 3. PTR continuity test Between TRM C (orange wire) and CE (violet wire). Should not be 0 ohms in both directions. 4. D continuity test Between CE (violet wire) and E (brown wire). Should not be 0 ohms in both directions. B: White wire C: Oragne wire -00 E: Brown wire CE: Violet wire Note: If the TRM is damaged, replace the frame assembly of the motor used together with the control box. (The motor torque becomes weak and all rotation speeds become higher.) - 55 -

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El
Connector
related
•
Fuse
failure
(#2,
#3-7)
•
LED
1
illumination
(#3)
•
LED
1
flashing
(#5)
CN3
O
Power
-supply
connector
Thread
trimmer
connector
Presser
foot
connector
/
Brake
connector
I
I
I
I
I
I
I
O
g
,0
O
CD
CN8
CN5
Motor
connector,
--
0
CN7
CN10
8A
fuse
CN4
CN6
0
\
0
cocci
000
000
0
a
0
a
Fuses
PTR,
D:
OK
#1
TRM
check
methods
1.
Remove
the
three
M5
screws
0
and
four
M4
screws
0.
2.
Set
the
tester
to
the
X
152
range
(0
ohm
adjustment).
3.
PTR
continuity test
Between
TRM
C
(orange
wire)
and
CE
(violet
wire).
Should
not
be
0
ohms
in
both
directions.
4.
D
continuity
test
Between
CE
(violet
wire)
and
E
(brown
wire).
Should
not
be
0
ohms
in
both
directions.
LED
1
(#3)
B:
White
wire
C:
Oragne
wire
-00
E:
Brown
wire
CE:
Violet
wire
Note:
If
the
TRM
is
damaged,
replace
the
frame
assembly
of
the
motor
used
together
with
the
control
box.
(The
motor
torque
becomes
weak
and
all
rotation
speeds
become
higher.)
-
55
-