Brother International MD-817 Service Manual - Page 60

Itmits

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LED 1 NO illumination #3 More than 5V 5V OUT: OK #3-1 Less than 5V Dispose of printed-circuit board. YES Power OFF. CPU RUN: NO OK #3-2 YES YES Replace LED 1 or IC3 5V OUT 0S2 #3-5 NO NO 5V IN: OK #3-4 YES CN6 voltage: OK NO #3-6 YES Fuse failure NO #3-7 (p.55) YES Transformer voltage: OK NO #3-8 YES Dispose of printed-circuit board. Replace REG1. Replace BD 1. D printedcircuit board check 0 (p.58) Replace the transformer. D printedcircuit board check 0 (p.58) #3-2B (CPU-57) 0V #3-1, #3-5 (REG1 OUT) (P52) ri.hr8,.. REG1 1. Sr op: • Itmits as 4geva Zt$ • ex on t " .., TT:. ... I.' BPD6 0 0,5 7, I 847r0 -3), IINR•2114-510CIR 7,, /16.91 Lb. RO, • o• #3-4 (REG1 IN) WPC #3-2A (CPU-27) #3-4 10ms or less +8V or more #3- 6 Between red wires #3 related 0V: Check pin 0V 5V OUT: OK #3-1 REG1 OUT +5±0.5V CPU RUN: OK CPU pin 27 #3-2A CPU RUN: OK CPU pin 57 #3-2B Refer to figure Refer to figure P57. P57. 5V IN: OK #3-4 5V OUT: OD #3-5 REG1 IN Refer to figure above. REG1 OUT 0 ohms using X1 range CN6 voltage: OK Transformer primary #3-6 voltage: OK #3-8 AC 8V or more between red wires Rating 10% -56-

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LED
1
illumination
#3
NO
More
than
5V
Dispose
of
printed
-circuit
board.
5V
OUT:
OK
#3-1
YES
Less
than
5V
CPU
RUN:
OK
#3-2
NO
YES
YES
Replace
LED
1
or
IC3
Power
OFF.
5V
OUT
0S2
#3-5
NO
5V
IN:
OK
#3-4
YES
NO
Dispose
of
printed
-circuit
board.
CN6
voltage:
OK
#3-6
YES
NO
Fuse
failure
#3-7
(p.55)
YES
NO
Transformer
voltage:
OK
#3-8
YES
D
printed
-
circuit
board
Replace
Replace
check
0
REG1.
BD
1.
(p.58)
Replace
the
transformer.
NO
D
printed
-
circuit
board
check
0
(p.58)
#3-2B
(CPU
-57)
0V
r
i.
h
r
8
,..
Itmits
1.
Sr
o
p:
•
as
4geva
Zt$
•
ex
on
t ”
.., TT:.
...
BPD6
0
0,5
7,
I
84
7r0
-3),
I.'
IINR•2114-510CIR
REG1
Lb.
RO
,
7,,
/16.91
•
o•
#3
related
0V:
Check
pin
0V
WPC
#3
-
6
Between
red
wires
#3-1,
#3-5
(REG1
OUT)
#3-4
(REG1
IN)
#3-2A
(CPU
-27)
#3-4
10ms
or
less
+8V
or
more
(P52)
5V
OUT:
OK
#3-1
CPU
RUN:
OK
CPU
pin
27
#3-2A
CPU
RUN:
OK
CPU
pin
57
#3-2B
5V
IN:
OK
#3-4
5V
OUT:
OD
#3-5
CN6
voltage:
OK
#3-6
Transformer
primary
voltage:
OK
#3-8
REG1
OUT
+5±0.5V
Refer
to
figure
P57.
Refer
to
figure
P57.
REG1
IN
Refer
to
figure
above.
REG1
OUT
0
ohms
using
X1
range
AC
8V
or
more
between
red
wires
Rating
10%
-56-