Welch Allyn Spot Vital Signs 4400, Service Manual

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Disassembly and repair
These procedures provide instructions for device disassembly and board removal, as well as
component replacement and reassembly.
Each part’s disassembly instructions might include one or both of the following:
•
Reassembly notes
: This subsection contains information specific to reassembly. At a
minimum, these notes indicate whether or not reassembly is the reverse of disassembly. The
notes also list service kits of replacement parts where applicable.
•
When replacing the component
: This subsection contains additional instructions related to
installing a new option or replacement part.
Each disassembly step includes drawings that illustrate the components to be removed. The
reassembly notes could be as short as one or two lines when reassembly is the reverse of
disassembly. When reassembly is more complicated, these notes alert you to any special care
required to complete the repair or installation and sometimes introduce separate reassembly
instructions. Line drawings appear in the reassembly notes only when they differ from the drawings
in the disassembly instructions.
WARNING
Electrical shock hazard. Disconnect AC power before opening the
device. Disconnect and remove the battery before proceeding with disassembly.
Failure to do this can cause serious personal injury and damage to the device.
WARNING
Risk of fire, explosion and burns. Do not short-circuit, crush, incinerate,
or disassemble the battery pack.
WARNING
Safety risk. Do not attempt to service the device when the device is
connected to a patient.
CAUTION
Before disassembling the device or installing options, disconnect the
patient from the device, power down the device, disconnect the AC power cord
and any attached accessories (for example, SpO2 sensors, blood pressure hoses
and cuffs, and temperature probes) from the device.
CAUTION
If your device is configured with a SureTemp module, remove the
probe well before disassembly.
CAUTION
Perform all repair procedures at a static-protected station.
CAUTION When the device case is opened, regard all parts as extremely fragile.
Execute all procedure steps with care and precision.
CAUTION Observe screw torque specifications, especially with screws that secure
directly into plastic standoffs.
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