Teledyne 9110EH - Nitrogen Oxides Analyzer - Manual (Page 235)

Model 9110EH Instruction Manual Troubleshooting & Repair
11.6.1. Disk-on-Chip Replacement
Replacing the Disk-on-Chip (DOC) will cause all of the instrument configuration parameters
to be lost unless the replacement chip carries the exact same firmware version. iDAS data
will always be lost and, if possible, should be downloaded prior to changing the DOC. If the
analyzer is equipped with at least one EEPROM flash chip (standard configuration), the
configuration settings are stored on the EEPROM. It is recommended to document all
analyzer parameters that may have been changed, such as calibration, range, auto-cal,
analog output, serial port and other settings before replacing the CPU chip. Refer to Figure
10-13 for locating the DOC and other CPU components.
• Ground yourself to prevent electrostatic damage to electronic components.
• Turn off power to the instrument, fold down the rear panel by loosening the
mounting screws. You may have to lift up the analyzer cover to prevent some
connectors on the CPU board to brush against the cover.
• When looking at the electronic circuits from the back of the analyzer, locate the
Disk-on-Chip on the CPU board. The chip should carry a label with analyzer model
number (M9110EH), firmware revision (example: M9110EH_C7.EXE), date and initials of
the programmer. Remove the IC with a dedicated IC removal tool or by gently
prying it up from the socket. Do not bend the connector pins.
• Reinstall the new Disk-on-Chip, making sure the notch at the end of the chip
matches the notch in the socket. It may be necessary to straighten the pins
somewhat to fit them into the socket. Gently but firmly press the chip all the way in.
Do not bend the pins.
• Close the rear panel, replace the cover and turn on power to the machine.
Generally, all of the setup information will need to be re-entered, including analog input and
output calibration unless the firmware revision has not changed and the analyzer is
equipped and properly configured with an EEPROM chip. Note especially that the A/D
converter must be re-calibrated, and all information collected in step 1 above must be re-
entered before the instrument will function correctly. The analyzer typically issues an
ANALOG CALIBRATION WARNING if the analog circuitry was not calibrated within 10
minutes after restart.
11.6.2. Flash Chip Replacement or Upgrade
The M9110EH CPU board can accommodate up to two EEPROM flash chips. The standard
configuration is one chip with 64 kb of storage capacity, which is used to store the analyzer
configuration as created during final checkout at the factory. Replacing this chip will erase
that configuration, which will be recreated with a new copy when restarting the analyzer.
However, if the firmware and/or the DOC is changed at the same time, all analyzer
configuration settings and iDAS data will be lost. Adding a second EEPROM chip to the
existing chip will double memory but this procedure will require a BIOS configuration and is
not a standard sales option. Also make sure that you receive a fully formatted EEPROM chip
for replacement. Contact the factory for details.
• Ground yourself to prevent electrostatic damage to electronic components.
• Turn off power to the instrument, fold down the rear panel by loosening the
mounting screws. If necessary, lift the cover to prevent the rear panel connectors
from brushing against it.
M9110EH Rev 0 221