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Section V – Maintenance and Servicing
TROUBLESHOOTING
WARNING: Dangerous voltages from the ac power line, test instruments, and measured source can be
present when troubleshooting the avm-2000. Exercise proper safety precautions!
CAUTION: Follow esd (electrostatic discharge) procedures when handling the AVM-2000 printed circuit
boards and their components.
NOTE: The AVM-2000 setup processes must be performed after making any repairs.
Depending on the observed symptom, probable areas for investigation or repair in the AVM-2000 are
indicated. Refer to disassembly instructions to gain access to the indicated areas, as well as reassembly
instructions. Refer to the theory of operation for the affected section. The parts layout, test points and
control/adjustment locations and schematics are found in parts list. When replacing any soldered
component on one of the printed circuit boards, particularly the Isolated Analog Section, make sure to
clean completely away any solder flux residue.
The AVM-2000’s operation is highly dependent on internal software-based functions within the two
microprocessor-based subsystems. Any component level troubleshooting requires access to software
development tools and the accompanying interfaces to connect the software development system to the
two microprocessors. Troubleshooting in this manual is limited to identifying problems with the
instrument’s major subsystems, which can be returned to PPM for repair/exchange if a defective
subsystem is identified.
Techniques are presented below to identify a need to replace/exchange one of the following:
AC Power Module
Rechargeable Battery
Power Supply Subsystem
Front Panel Subsystem
Isolated Analog Subsystem
Meter Movement
Interconnection Cables
NOTE: Failure to keep the Isolated Analog Subsystem Board clean of contaminants may compromise the
performance of the AVM-2000. Avoid touching the electrical surfaces of this board, unless wearing clean
gloves.
Troubleshooting Tip: Always check signals/voltages at BOTH ends of the indicated cable/connector. If the
indicated signal is present at one end of the cable but not at the other, a defective cable is indicated
rather than a defective subsystem. In the steps below, only one end of the cable is called out in each step.
If the indicated positive results are not obtained in the step, always check the like connection (i.e. red
wire, #5 pin, etc.) at the other end of the cable to eliminate a defective interconnection cable
.
