Brother International MD-817 Service Manual - Page 66

Replace, HIC2., HIC1., Treadle, HIC2-15, HIC1-11, 441LrL, P,t,}, 27epoe, HIC1-16, neutral, Refer,

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Page 66 highlights

V HIC2 pin 15: OK #7-10 NO CPU pin 51: OK #7-11 NO CPU RUN: OK #7-12 YES YES YES Replace HIC2. NO ZD1 "K": OK #7-16 NO Replace ZD1. YES Replace HIC2. CPU pin 38:OK #7-14 YES CPU pin 39: OK #7-15 YES Replace the CPU. NO NO HIC1 pin 16: OK #7-18 YES Replace HIC1. Replace the CPU or HIC2. HIC1 pin 11: OK #7-17 NO NO Treadle unit (p.67) YES Replace HIC1. #7-16 (ZD1 „K") #7-15 (CPU-39) #7-11 (CPU-51) #7-10 (HIC2-15) #7-17 (HIC1-11) ov REG1 66 oII - 9r 1 I f 441g*LrLel o , P,t,} • '8' .11Q2 .14-1..:.1117-7)6'..-.1.27epoeloo47o.ts-L1.) 224,i;;4 a III -COLIP io IP. EIDIREEffirTe $ Kan • :187h 'a S8 '91== yo.w/. 7--ii " ik LSI!, .ono Mac . 8[1 #7-14 (CPU-38) #7-18 (HIC1-16) HIC2 pin 15: OK CPU pin 51: OK CPU RUN: OK CPU pin 38: OK CPU pin 39: OK ZD1 ,,K": OK #7-10 #7-11 #7-12 #7-14 #7-15 #7-16 Treadle neutral 4.5V or more Treadle forward 0.5V or less 4.5V or more 0.5V or less Refer to #3-2 O.5V or less 0.5V or less 4.5V or more 0.5V or less 4.0V or more HIC1 pin 11: OK #7-17 Treadle neutral Treadle forward 0.5V or less 0.5V or less HIC1 pin 16: OK #7-18 4.5V or more 0.5V or less #7-10 -#7-18 related 0V: Check pin 0V - 62- (P52)

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V
HIC2
pin
15:
OK
#7-10
NO
CPU
pin
51:
OK
#7-11
NO
CPU
RUN:
OK
#7-12
YES
CPU
pin
38:OK
#7-14
YES
CPU
pin
39:
OK
#7-15
YES
Replace
the
CPU.
YES
YES
Replace
HIC2.
NO
ZD1
”K":
OK
#7-16
NO
Replace
ZD1.
NO
Replace
the
CPU
or
HIC2.
NO
HIC1
pin
16:
OK
#7-18
YES
Replace
HIC1.
HIC1
pin
11:
OK
#7-17
NO
NO
Treadle
unit
(p.67)
YES
Replace
HIC1.
YES
Replace
HIC2.
#7-16
(ZD1
„K")
#7-15
(CPU
-39)
#7-11
(CPU
-51)
#7-10
(HIC2-15)
#7-17
(HIC1-11)
ov
66
441LrL
,
I
f
g*
el
o
P,t,}
.
1
1Q
2
.1
4...
-
1:11
1-6-1
7'
7
)
....
27epoe
lo
o
47
o
ts
.-L
1.)
2
2
4
,;
i4
;
a
III
-COLIP
IP.
io
REG1
oII
—
9r
1
•
'8
'
EIDIREEffirTe
•
$
:1
8
7h
Kan
.ono
Mac
'
a
S
8
'
9
1==
"
.
8
[1
LSI!,
yo.
w.
/
7--ii
ik
#7-14
(CPU
-38)
#7-18
(HIC1-16)
HIC2
pin
15:
OK
#7-10
CPU
pin
51:
OK
#7-11
CPU
RUN:
OK
#7-12
CPU
pin
38:
OK
#7-14
CPU
pin
39:
OK
#7-15
ZD1
,,
K":
OK
#7-16
Treadle
neutral
4.5V
or
more
4.5V
or
more
Refer
to
#3-2
O.5V
or
less
4.5V
or
more
4.0V
or
more
Treadle
forward
0.5V
or
less
0.5V
or
less
0.5V
or
less
0.5V
or
less
HIC1
pin
11:
OK
#7-17
HIC1
pin
16:
OK
#7-18
Treadle
neutral
0.5V
or
less
4.5V
or
more
Treadle
forward
0.5V
or
less
0.5V
or
less
#7-10
—#7-18
related
0V:
Check
pin
0V
(P52)
-
62-