7-4. Troubleshooting
Apparent malfunctions are often the result of misinterpretation of specifications or due to an incomplete
understanding of the instrument. A thorough review of the operating instructions for this instrument is
recommended prior to any component replacement, etc. Check to be sure that cables and other test equipment
are in good working order before attempting to troubleshoot the 4300B.
If the Model 4300B exhibits problems that cannot be eliminated by reviewing Sections 2, 4, 5, 7, or 9, the
following guidelines have been established to help solve the problem.
7-4-1. Localizing the Problem
The key to successful troubleshooting is to localize the problem as much as possible before trying to pin the
problem down to a specific component. Certain questions should be asked such as "Does the problem occur
on all ranges or on a specific range only?". The power supplies are also one of the first things that should be
checked.
As it is not possible to anticipate all failure modes of the 4300B, servicing personnel should become familiar
with Section 7 to gain a complete understanding of the internal workings of this instrument.
7-4-2. Component Replacement
If the problem has been identified as a faulty component, the accuracy of the 4300B can be maintained only if
the following precautions are taken:
¿
Use only the specified component or its exact equivalent. Spare parts can be ordered from your nearest
Valhalla Scientific Service Center or from the factory directly by referring to the Valhalla Stock Number listed
in the Parts Lists section at the back of this manual.
¿
Use only 63/37 grade rosin core electronic grade solder with a 50W or lower maximum power soldering
iron.
¿
When soldering, heat the terminal of the component, not the solder. Apply solder smoothly and evenly. Do
not move the component until the solder has cooled. Bad solder joints can cause additional problems!
¿
Static sensitive parts require special handling procedures. Always treat an unknown part as if it were static
sensitive.
