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4220 Flow Meter
Section 6 Maintenance and Service
6-16
circuitry.
Simply being connected to the rest of the circuitry
provides some protection. Most of the circuitry is
well-protected from damage caused by static discharge
when the unit is powered up. However, an IC should
never be replaced when the unit is turned on.
• Individual CMOS semiconductors and built-up printed
circuit boards should always be transported in
conductive packaging.
Foil is satisfactory; metallized plastic bags work well.
Ordinary plastic bags and pink poly are not satisfactory
unless the legs or leads are also stuck into a block of
black conductive foam. If purchased replacement compo-
nents do not come in marked, protective packaging, do
not use them. They may already be destroyed.
• Once assembled and soldered, printed circuit boards are
easily damaged by improper repair procedures.
Do not attempt to remove components, particularly ICs,
from printed circuit boards unless skilled at this
procedure. After a defective component is replaced, the
unit still may not work if excessive heat or pressure has
broken the foil traces or pulled the cores from holes on
the board.
6.8 Using FLASH UPDATE Teledyne Isco manufactures a number of instruments - 4100
Series Flow Loggers, 4200 Series Flow Meters, and 6700 Series
Samplers - that use circuitry based on FLASH EPROMs. Unlike
earlier EPROMs that require UV erasure and were not easily
field replaced, the FLASH EPROM lets you upgrade the software
in the instrument without opening the unit or returning it to the
factory. You can now update the software with a disk from
Teledyne Isco, an IBM®-compatible personal computer and a
connect cable.
The disk contains UPDATE, a program specifically for flash
memories, and a set of software files to update the FLASH
EPROM.
Each disk is labeled with:
• The instrument series number
• The software revision number for each instrument in
the series
• The part number of the disk
6.8.1 Getting Started The following instructions assume that:
• You have had some experience using the computer.
• You have a Computer Connect Cable. If you do not have
the cable, order it from your sales representative or the
factory. For more detailed information about hardware
requirements, see Table 6-1 on page 6-20.
• You are familiar with Microsoft® Windows®. FLASH
UPDATE uses the standard Windows user-interface for