4220 Flow Meter
Section 6 Maintenance and Service
circuitry.
Simply being connected to the rest of the circuitry provides some protection. Most of the circuitry is
•Individual CMOS semiconductors and
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.
6.8Using 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
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
•You are familiar with Microsoft® Windows®. FLASH UPDATE uses the standard Windows
