Brother MFC-L2712DN - Chapter 2 Error Indications and Troubleshooting; 1. Introduction; 4. Troubleshooting

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TROUBLESHOOTINGTROUBLESHOOTING
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Troubleshooting is the countermeasure procedures that the service personnel should follow ifTroubleshooting is the countermeasure procedures that the service personnel should follow if
an error or malfunction occurs with the machine. It is impossible to anticipate all of the possiblean error or malfunction occurs with the machine. It is impossible to anticipate all of the possible
troubles which may occur in future and determine the troubleshooting procedures, so thistroubles which may occur in future and determine the troubleshooting procedures, so this
chapter covers some sample troubles. chapter covers some sample troubles.
However, those samples will help the service personnelHowever, those samples will help the service personnel
pinpoint and repair other defective elements.pinpoint and repair other defective elements.
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Be sure to observe and follow all the precautions to prevent any secondary problems fromBe sure to observe and follow all the precautions to prevent any secondary problems from
happening during troubleshooting.happening during troubleshooting.
(1)(1)
Always tAlways t
urn OFF the pourn OFF the po
wer and unwer and un
plug the poplug the po
wer cablwer cabl
e before reme before rem
oving any coving any c
overs orovers or
PCBs, adjusting the machine and so on. If you need to take voltage measurements with thePCBs, adjusting the machine and so on. If you need to take voltage measurements with the
power switched on, take the greatest of care not to receive an electric shock.power switched on, take the greatest of care not to receive an electric shock.
(2)(2)
When conWhen con
nectinnectin
g or discong or discon
nectinnectin
g cable cog cable co
nnectornnector
s, make sus, make su
re that you hre that you h
old theold the
connector body and not the cables.connector body and not the cables.
(3)(3)
StSt
atic elecatic elec
tricittricit
y charged in youy charged in you
r body may damagr body may damag
e electrone electron
ic partic part
s. Before hands. Before hand
ling theling the
PCBs, touch a metal portion of the machine to discharge static electricity charged in yourPCBs, touch a metal portion of the machine to discharge static electricity charged in your
bodybody
. When transporting PCB. When transporting PCB
s, be sure to wrap s, be sure to wrap
them in conductive sheets.them in conductive sheets.
When replacing the PCBs, put on a grounding wrist band and perform the job on anWhen replacing the PCBs, put on a grounding wrist band and perform the job on an
antistatic mat. Also take care not to touch the conductor sections on the flat cables.antistatic mat. Also take care not to touch the conductor sections on the flat cables.
(4)(4)
FolFol
low low
the the
warwar
ninnin
g by ag by a
ll mll m
eanean
s.s.
WarningWarning
Hazard labels as shown below are attached to the machine. Fully understand theHazard labels as shown below are attached to the machine. Fully understand the
descriptions on the hazard labels and observe them during troubleshooting.descriptions on the hazard labels and observe them during troubleshooting.
Take extreme care not to remove or damage the hazard labels.Take extreme care not to remove or damage the hazard labels.