Firmware Ic Replacement - Lakeshore 340 User Manual

11.9 FIRMWARE IC REPLACEMENT

This paragraph contains a procedure to replace the Master Firmware IC (U26) and the Input Firmware IC
(U146). An update kit to perform this procedure is available from the Lake Shore Instrument Service
Department. The kit includes:
• 32-pin IC – M340MN Flash Memory chip (located at U26).
• 28-pin IC – M340SV EEPROM Memory chip (located at U146).
Required tools:
• Small Standard flat-head screwdriver or pry tool for chip extraction.
• Small Phillips-head screwdriver.
• 5/64-inch Allen wrench.
Before You Start
1. Record the instrument settings. This update requires chip replacement.
2. Stop your application while updating the software. The update process may take as long as ten minutes.
Disable the instrument from controlling, digital I/O, and analog outputs.
3. Press the Options key, then press the More key until the REVISION INFORMATION SCREEN displays
the current firmware revision information for both Master and Input processors. If the instrument displays
no version numbers, please contact Lake Shore Instrumentation Service Department.
Replacing the Firmware
WARNING: To avoid potentially lethal shocks, turn off controller and disconnect it from AC power
before performing these procedures.
1. Turn the Model 340 power switch OFF. Unplug the power cord from the wall outlet, then from the
instrument.
2. Stand unit on its face. Use the Allen wrench to remove the 4 screws on each side of the covers.
3. Use the small Phillips screwdriver to remove the top cover screws. Your Model 340 may have 1 or 2
screws on the top cover.
4. Remove the rear plastic bezel. The covers are tracked. Slide the top cover to the rear on the tracks to
remove it.
5. Remove four screws attaching the Transformer Assembly to the chassis. Gently lift the assembly and rest
it on the chassis at an angle.
Service
Lake Shore Model 340 Temperature Controller User's Manual
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