Routine Checks and Maintenance
9-16 7SA6 Manual
C53000-G1176-C156-2
9.6 Return
Siemens strongly recommends that no further repairs on defective devices, boards,
or components be done. Special electronic components are used for which proce-
dures for preventing electrostatic discharges must be followed. Most importantly, spe-
cial production techniques are necessary to avoid damaging the wave-soldered multi-
layer boards, the sensitive components, and the protective varnish.
If a problem cannot be solved by the procedures described in Section 9.5, then the
complete
device (including front cover and detached operator panel, if applicable)
shouldbereturnedtothefactory.
The original transport packaging material should be used for returning a device. If al-
ternative packaging material is used, then the device and other contents must be pro-
vided with protection against shock and vibration according to IEC 60255–21–1
Class 2 and IEC 60255–21–2 Class 1.
Before returning a device, retrieve and save all of the configuration, function and con-
trol settings, and any important information. Note any changes that were made to the
jumpers on the internal printed circuit boards after the device was first delivered.
n
Note:
Repaired devices are returned from the factory with all jumpers on the printed circuit
boards set in the original positions according to the ordering number. All configuration,
function and control parameters have the default setting.
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