Brother International HS-5300 Service Manual - Page 136

Troubleshooting

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2. TROUBLESHOOTING 2.1 Troubleshooting procedure 2.1.1 Malfunctions When carrying out the countermeasures for malfunctions described in this section, check connectors for contact failure before measuring the voltage at specified connector pins. (1) No AC power supplied Possible cause Supply voltage Power plug Fuse (F2) Wiring Step , Check 1 Is the correct voltage present at the outlet? 2 Is the power cord securely plugged into the outlet? 3 Is the fuse blown? 4 Unplug the power supply plug. Is there a broken wire between the AC input connector of the power supply and the power plug? Result NO NO NO YES Remedy Inform the user that the correct voltage is not supplied at the outlet. Plug the power cord securely into the outlet. If the fuse blows again immediately after replacing the power supply PCB, check if there is a short circuit somewhere in the AC power supply line. Replace the AC power cord. (2) No DC power supplied Possible cause AC power supply Wiring, DC load Power supply unit Step 1 2 Check Is AC power supplied between connectors P1-L and P1-N when the power plug is plugged into the outlet? Turn the power switch OFF and disconnect the P17 connector (Driver PCB). Turn the power back on and measure the voltage between the terminals. Do the measured voltage satisfy the value in the table below? PCB Driver PCB +lead pin P17-1 P17-4 P17-5 P17-8 -lead P17-2 P17-7 P17-7 P17-7 Voltage +5V +25V +52V +39/30V Result NO YES NO Remedy Follow the same check procedure of 1) "No AC power supplied". Turn the power switch OFF, reconnect the connector and turn the power switch ON again. If the protector circuit is activated, check the connector, the wiring from the connector, and the DC load. Replace the power supply unit. IV-2

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2.
TROUBLESHOOTING
2.1
Troubleshooting
procedure
2.1.1
Malfunctions
When
carrying
out
the
countermeasures
for
malfunctions
described
in
this
section,
check
connectors
for
contact
failure
before
measuring
the
voltage
at
specified
connector
pins.
(1)
No
AC
power
supplied
Possible
cause
Step
,
Check
Result
Remedy
Supply
voltage
1
Is
the
correct
voltage
present
at
the
outlet?
NO
Inform
the
user
that
the
correct
voltage
is
not
supplied
at
the
outlet.
Power
plug
2
Is
the
power
cord
securely
plugged
into
the
outlet?
NO
Plug
the
power
cord
securely
into
the
outlet.
Fuse
(F2)
3
Is
the
fuse
blown?
NO
If
the
fuse
blows
again
immediately
after
replacing
the
power
supply
PCB,
check
if
there
is
a
short
circuit
somewhere
in
the
AC
power
supply
line.
Wiring
4
Unplug
the
power
supply
plug.
Is
there
a
broken
wire
between
the
AC
input
connector
of
the
power
supply
and
the
power
plug?
YES
Replace
the
AC
power
cord.
(2)
No
DC
power
supplied
Possible
cause
Step
Check
Result
Remedy
AC
power
supply
1
Is
AC
power
supplied
between
connectors
P1
-L
and
P1
-N
when
the
power
plug
is
plugged
into
the
outlet?
NO
Follow
the
same
check
procedure
of
1)
"No
AC
power
supplied".
Wiring,
DC
load
2
Turn
the
power
switch
OFF
and
disconnect
the
P17
connector
(Driver
PCB).
Turn
the
power
back
on
and
measure
the
voltage
between
the
terminals.
Do
the
measured
voltage
satisfy
the
value
in
the
table
below?
YES
Turn
the
power
switch
OFF,
reconnect
the
connector
and
turn
the
power
switch
ON
again.
If
the
protector
circuit
is
activated,
check
the
connector,
the
wiring
from
the
connector,
and
the
DC
load.
PCB
+lead
pin
-lead
Voltage
Driver
PCB
P17-1
P17-4
P17-5
P17-8
P17-2
P17-7
P17-7
P17-7
+5V
+25V
+52V
+39/30V
NO
Replace
the
power
supply
unit.
Power
supply
unit
IV
-2