Brother International MD-817 Service Manual - Page 75

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Machine operates. NO #111 CPU pin 38: OK #111-1 YES YES Replace the CPU. CPU pin 39: OK #111-2 YES CPU pin 18: OK #111-3 NO Replace HIC1. NO NO HIC1 pin 16: OK #111-5 YES Replace HIC1. H1C1 pin 11: OK #111-4 YES NO NO Treadle unit (p.67) Replace HIC1. (P53) (CPU-38) #111-2 (CPU-39) (CPU-18) (HIC1-11) #111-5 (HIC1-16) PEG1 , E53 ffa do -0, rti T irst;trt a* •p•- •o --7- ...-- -v--.:"i,,.---1,..Li.•7BiPc.D...r,.6r.0:M0-I5ML.,.I •E 0V ., t B47 SO- 4„, cc7O alt '''-----, tM. i tie' 1,1111 '.-24.0 191802M-1,3,36, 1 -"a$$$;`%-.-4-, z • *SI* , 'F r &al D410 #111 related OV: Check pin OV CPU pin 38: OK #111- 1 CPU pin 39: OK #111-2 CPU pin 18: OK #111-3 HIC1 pin 11: OK #111-4 HIC1 pin 16: OK #111-5 4.5V or more for backward depression 0.5V or less for backward depression Needle (upper) position: 0.5V or less Other than needle (upper) position: 4.5V or more 4.5V or more for backward depression 0.5V or less for backward depression - 71 -

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Machine
operates.
#111
NO
YES
Replace
the
CPU.
(CPU
-38)
CPU
pin
38:
OK
#111-1
YES
CPU
pin
39:
OK
#111-2
YES
CPU
pin
18:
OK
#111-3
NO
Replace
HIC1.
NO
NO
HIC1
pin
16:
OK
#111—5
YES
Replace
HIC1.
H1C1
pin
11:
OK
#111-4
NO
NO
Treadle
unit
(p.67)
YES
Replace
HIC1.
#111-2
(CPU
-39)
(CPU
-18)
(HIC1-11)
#111-5
(HIC1-16)
#111
related
OV:
Check
pin
OV
,
rti
T
irst;trt
p
-7-
-
--
-"
,
cr.:
i•
r
.,.
L
-
•
....
,
••
o
i,,.--1
L.
.7
i
.
MIMI
•
...--
v.:
—
..
BPD600-
5
.,
t
B47
SO
-
4
„,
cc7O
alt
'''----,
---
'-
.
24.0
191802M-1
,
3,36,
z
•
*SI*
,
PEG1
ffa
do -0,
a*
'F
r
D410
&al
E53
•
E
t
.
Mi
ti‘
e
1,1111
1
---
-"a$$$;`%
.
4,
0V
(P53)
CPU
pin
38:
OK
#111
-
1
CPU
pin
39:
OK
#111-2
CPU
pin
18:
OK
#111-3
HIC1
pin
11:
OK
#111-4
HIC1
pin
16:
OK
#111-5
4.5V
or
more
for
back-
ward
depression
0.5V
or
less
for
backward
depression
Needle
(upper)
position:
0.5V
or
less
Other
than
needle
(up
-
per)
position:
4.5V
or
more
4.5V
or
more
for
back-
ward
depression
0.5V
or
less
for
backward
depression
-
71
-