Detailed Instructions For Loading Wavelength Table - Thermo Scientific GENESYS 20 Service Manual

8.

Detailed Instructions for Loading Wavelength Table

PROBLEM: Default Wavelength (WL) Calibration Table is being used instead of calibration specific to the
instrument.
During manufacture, a wavelength (WL) calibration is performed on the 20 GENESYS. A WL
calibration table, specific to the particular instrument is then stored into memory. If this
customized WL calibration table is lost, then the system uses a default WL calibration table stored
in ROM memory. This default table is fairly accurate for the majority of 20 GENESYS
instruments, however, it is not the specific WL calibration table for the instrument and may result
in a wavelength accuracy error outside the stated +/- 2 nm tolerance.
SYMPTOM/CAUSE:
At instrument turn-on, the following message appears on the display:
In a normal operating unit, the display will show:
Followed by the firmware revision level, filter wheel init, mono init etc.
Loss of memory on the internal EEPROM may have been caused by a loose EEPROM chip.
SOLUTION:
I. Before loading the Wavelength Calibration Tables into the GENESYS 20 instrument, please perform the
following steps, which in some cases may remedy the problem:
- Ensure that the power is shut off and the ac power cord is disconnected from the rear of the
GENESYS 20 instrument.
- Lift the small cover (rear of the display) to gain access to the EEPROM (U3); some instruments
have the printer installed in this location.
- The EEPROM is located in the middle of the opening when looking down onto the main circuit
board; U3 socket location. If the EEPROM socket has a small lever, pull it up to release locking
tension on the EEPROM pins. Reseat the EEPROM by lightly pushing down on it. Once it is
seated, push the socket lever back down to lock the EEPROM in place. If the EEPROM socket
does not have the lever, lightly push down on the EEPROM.
- Put the cover or printer assembly back in place, plug in the ac power cord and power on the
instrument to see if the problem has been resolved. If the problem still exists, power off the
instrument and continue with the following detailed procedure.
INVALID WL TABLE
"LOADING DEFAULT WL TABLE"
SPEC 20 GENESYS
4 - 11
Troubleshooting