Brother International MD-817 Service Manual - Page 36

specification, timing, chart

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4. COV specification timing chart A. Time that folder opens and closes A. 1 Alternate motion ( when DIPA-7 is set to ON ) Folder switch for opening and closing folder ON ON ON OFF OFF OFF Folder opening and closing solenoid ---] ON ON OFF A. 2 Momentary motion ( when DIPA-7 is set to OFF ) Folder switch for opening and closing folder Folder opening and closing solenoid ON ON ON OFF OFF OFF ON i i ON ON OFF OFF OFF B . Thread trimming timing Depressing treadle backward 7 Needle up position signal Needle down position signal Brake solenoid Bobbin thread trimming solenoid Spreader thread trimming solenoid Presser foot l ifter solenoid 40msec. 50msec. F- 7 10 msec K: > 40msec. 80 < > msec ' 50msec.< when DIPA-8 is set to OFF 140msec. 600msec. 200Hz 390msec. (300msec.) () shows the number wi thout spreader thread trimming. -32-

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4.
COV
specification
timing
chart
A.
Time
that
folder
opens
and
closes
A.
1
Alternate
motion
(
when
DIPA-7
is
set
to
ON
)
Folder
switch
for
opening
and
closing
folder
ON
Folder
opening
and
closing
---]
ON
solenoid
OFF
ON
OFF
ON
A.
2
Momentary
motion
(
when
DIPA-7
is
set
to
OFF
)
Folder
switch
for
opening
and
ON
closing
folder
Folder
opening
and
closing
solenoid
B
.
Thread
trimming
timing
Depressing
treadle
backward
Needle
up
position
signal
Needle
down
position
signal
Brake
solenoid
Bobbin
thread
trimming
solenoid
Spreader
thread
trimming
solenoid
Presser
foot
l
ifter
solenoid
7
OFF
OFF
ON
ON
OFF
ON
i
i
ON
OFF
ON
OFF
OFF
ON
OFF
OFF
F
- 7
10
msec
K:
>
40msec.
80
<
>
40msec.
msec
'
50msec.<
when
DIPA—8
50msec.
is
set
to
OFF
140msec.
600msec.
200Hz
390msec.
(300msec.
)
(
)
shows
the
number
wi
thout
spreader
thread
trimming.
—32—