Avery Berkel CX20 SERIES, Service Manual

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Overview
xvi CX20/CX30/CX34 Service Manual
SERVICE PRECAUTIONS
General
Before servicing a machine, it is recommended that the machine’s data is backed–up.
Refer to Part 2, Programming Handbook for use on Data Collector Units (DCUs).
Static Sensitive Devices
Almost all electronic integrated circuits, commonly known as ’chips’, are static sensitive
devices (SSDs). They will be destroyed if contaminated with static electricity.
When working with SSDs follow anti–static procedures which include:
the wearing of an anti–static wrist bracelet
making sure that the workbench is covered by a static–discharge mat
avoiding wearing nylon clothes
discharging any anti–static electricity which may be on your person by contacting an
earthed device before handling an SSD.
Keep an SSD in a bag made of an anti–static or conductive material. When shipping an
SSD, cover all the SSD contacts with an anti–static or conductive material (not polythene).
When shipping an assembly which contains SSDs, pack it securely in an anti–static bag.
Handling Procedures
The transducer in the machine or remote weighing platform is not protected against
negative overload. Do not lift the machine or remote weighing platform by the cross
assembly or transducer after the covers have been removed.
When the cross assembly, load stop or transducer are disassembled or otherwise removed,
handle the transducer with care. Do not exert physical force on it and do not attempt to
disassemble its component parts.
The strain pads and wires in the transducer are extremely sensitive. Do not attempt any
maintenance within the transducer and ensure that the strain wires are not damaged by
tools or other objects during maintenance, storage or shipment.
Main PCB
The main PCB has a battery installed on it to maintain memory data. If you are removing
the main PCB from the unit, the battery must be switched off (refer to procedures) to
prevent live parts of the PCB being shorted. Before switching off the battery, if possible, the
data contained in the machine should be backed–up (refer to Part 2, Programming
Handbook for use on the DCU). Although the battery supply is switched off, take great care
not to short the battery terminals during maintenance. After fitting a main PCB the battery
must be switched on.
Print Head
The thermal print head of the printer will be damaged if scratched with sharp objects (such
as a screwdriver or knife blade). When examining or servicing the print head, take care not
to damage it. If the print head requires cleaning, use only the cleaning kit specified in these
procedures.