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Maintenance
&
Troubleshooting
CAUTION
Make sure to save the customer config-
uration and/or the customer software
when you download new software or
configurations.
static-sensitive components or assemblies should
only be done at a static-free work station by
qualified service technicians. Increasing the
humidity in the work area minimizes static
electricity problems.
•
Do not allow anything that can generate or hold a
static charge on the workstation surface.
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5.1
HANDLING CMOS PARTS
5. DISASSEMBLYIREASSEMBLY
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Disconaect all cables from the VRM 500.
NOTE
Leave the thermal cube in its place on the
chassis.
•
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Keep the component leads shorted together
whenever possible.
Pick up components by their bodies. Never pick
them up by their leads.
Do not slide the components over any surface.
Avoid handling components in areas with a floor
or work surface covering that can generate a static
charge.
Use a soldering iron connected to earth ground.
Use only approved, anti-static, vacuum-type
desoldering tools for removing components.
•
When removing printed circuit boards (PCBs),
remove the screws in a diagonal pattern to reduce
stress on the boards.
•
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Step 1.
5.2
DISASSEMBLYIREASSEMBLY
This paragraph describes how to disassemble and assemble
the VRM 500 when replacing the parts. Follow these
procedures to prevent any damage that could result if the
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unit or its parts are not properly handled.
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Step 2.
Unscrew the four Phillips screws holding the top
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and bottom covers together. Lift the top cover
!
and front panel.
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Step 3.
Insert a flat-blade screwdriver under the shield.
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Remove the shield by separating at the corners.
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Be careful not to overbend the corners, or
:
damage the components and the board.
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Step 4.
Remove
the
screw
securing the
voltage
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regulator.
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Step 5.
Insert a flat-blade screwdriver under the board
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and push upwards. The board is now released.
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68P02943C68
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WARNING
An authorized Motorola Service Center
should perform the replacement of the
lithium battery. The lithium battery is
very sensitive to heat. Attempting to re-
place it without proper precautions may
cause the battery to explode.
•
Use the RSS to read and store the current
configuration and customer software.
Load the standard configuration.
Test the configuration.
If the VRM 500 is still not functioning properly,
contact the local Motorola Regional Support
Center in your area. In North America dial
(708) 576-5760
for
the
Motorola
National
Subscriber Depot (NSD). The depot address is
1318 North Plum Grove Road, Schaumburg IL
60173, U.S.A.
Minimize handling of static-sensitive components
and modules.
•
Transport and store static-sensitive components or
assemblies in their original containers on a metal
rail.
Label
any
package
that
contains
static-sensitive components or assemblies.
•
Discharge static electricity from the body by
wearing a grounded antistatic wrist strap while
handling
these
components.
Servicing
REPLACING THE LITHIUM BATTERY
The VRM 500 contains CMOS parts and is, therefore,
susceptible to damage from electro static discharge. Take
the following precautions when handling the VRM 500
parts.
4.
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