Philips Avalon CTS M2720A, Service Manual

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Disassembly/Reassembly
WARNING
• Performance verification: do not place the system into operation after repair or maintenance has been
performed, until all performance tests and safety tests listed in Chapter 6 of this service manual have been
performed. Failure to perform all tests could result in erroneous parameter readings, or patient/operator
injury.
• Energized circuits are accessible with the covers open. Do not work on the base station with the covers open
and AC power connected. Only qualified service personnel should open or disassemble the base station.
• Before attempting to open or disassemble the base station, disconnect it from the AC mains supply.
CAUTION Observe ESD (electrostatic discharge) precautions when working within the unit.
Introduction
Remember to store all screws and parts in a safe place for later refitting.
How to Use this Chapter
The disassembly sections detail the step-by-step procedures you use to access replaceable parts of the base
station.
All the transducers are sealed at the factory and are not repairable. Replacement transducers are supplied
complete with both battery and belt button fitted.
The Avalon base station consists of two major assemblies:
• The top cover assembly
• The chassis assembly
The top cover assembly contains the human interface (HIF) board, the keypad inlay, and the battery charge
contacts and wiring. The top cover assembly is only available as a complete assembly, and a repair to any part
of the top cover assembly is effected by replacement of the whole assembly.
The chassis assembly contains the metal chassis and power supply, the receiver board and the monitor
interface (MIF) board. The power supply always comes complete with the chassis (without boards), and a
repair to either the power supply or the chassis is effected by replacement of this chassis/power supply
assembly.