Brother International MD-817 Service Manual - Page 76

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Wiper operates. NO #113 YES TR 3B: OK #113-1 Thread NO trimmer operates. #112 TR 2B: OK #112- 1 YES NO Replace TR3. NO Replace TR2. CPU pin 61: OK #113-2 NO Replace the CPU. YES Replace HIC2. CPU pin 60: OK #112-2 NO Replace the CPU. D (P53) YES Replace HIC2. D (P53) Needle (lower) V 1 Needle (upper) #113-1 (TR3-B) #112-1 (TR2-B) #112-1 TR2-B TR2 base 1V or less #112-2 CPU pin 60 1.5±0.5 V 4.5V or more I )I TR TR6 o.-;•-:,3 ,5' .,. °FL'''1 '5 7ffg Ii• ,7.s-SA,qA. TR5 TR1 . .., .4. ri. 71" r, .. r.- ft Oq tA . :E LI ": 11 rri '''' 2 -"60 !IT 1,.,...irteir 5 4 _i L---za--- r la.95 ;CD- I__w_ _i 1,_.1 .. r '6. ''' t 7) - - BPD 2• 71 c7O. .1(ti.''' ' 4?' ...., r L Meerars-xces 91 Zer" # 113 - 2 (CPU-61) #112-2 (CPU-60) ti 117 ' n . '- : • j... $ ' O It1, ,_ • mai • low --- 1 •n flt t*ris, 0-,.. I -S5 0.5 V or less #113-1 PTR3 B PTR3 base T1 ' T2 k 1V or less 1.5±0.5 V #113-2 CPU pin 61 0.5V or less 4.5V or more #112, #113 related OV: Check pin OV TR 26: OK #112-1 Refer to figure above. CPU pin 60: OK #112-2 Refer to figure above. TR 3B: OK #113-1 Refer to figure above. -72- CPU pin 61: OK #113-2 Refer to figure above.

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  • 112
Wiper
operates.
#113
NO
TR
3B:
OK
#113-1
NO
CPU
pin
61:
OK
#113-2
NO
Replace
the
CPU.
Thread
trimmer
operates.
#112
YES
Replace
TR3.
YES
Replace
HIC2.
#113-1
(TR3-B)
#112-1
(TR2-B)
TR
TR6
I
)
I
TR5
TR1
D
(P53)
.,.
°FL'
'
'
1
'5.•
,
o.
-;•-:,3
,
5'
71"
.
Oq
..,
11 rri
.s
,
A,
A
.4
.
ri.
,,
....
rei
.-
....
7ffg
Ii•
7-Sq.
r, ..
r.-
ft
tA
.
:E LI
":
''''
2
-"60
!IT
1
it
r
4
_i
L
---za---
r
5
...
,,,,,,...,
la.95
;CD-
I___
w
_i
1,_.1
..
r
'
6.
'''
t
7)
— —
BPD
2•
71
c7O
.
.1(ti.''
' '
4
?
'
....
,
r
L
Meerars-xces
91
Ze
r
"
#
113
- 2
ti
1
'
n
'-
.
1
7
:
•
j...
' O
1,_
1
$
It,
•
mai
•
low
---
•n
ris
—
I
-S
5
t*
,
0
,..
(CPU
-61)
#112-2
(CPU
-60)
#112,
#113
related
OV:
Check
pin
OV
flt
NO
TR
2B:
OK
#112
-
1
NO
CPU
pin
60:
OK
#112-2
NO
Replace
the
CPU.
#112-1
TR2-B
YES
Replace
TR2.
YES
Replace
HIC2.
Needle
(lower)
V
1
TR2
base
Needle
(upper)
1.5±0.5
V
D
(P53)
1V
or
less
#112-2
CPU
pin
60
0.5
V
or
less
4.5V
or
more
#113-1
PTR3
B
1V
or
less
T1
'
T2
PTR3
base
k
1.5±0.5
V
#113-2
CPU
pin
61
0.5V
or
less
4.5V
or
more
TR
26:
OK
#112-1
CPU
pin
60:
OK
#112-2
TR
3B:
OK
#113-1
CPU
pin
61:
OK
#113-2
Refer
to
figure
above.
Refer
to
figure
above.
Refer
to
figure
above.
Refer
to
figure
above.
-72-